10 April 2023, Volume 45 Issue 2

    

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• Research Papers
• Uncertainty analysis of extreme design wind speed in Hong Kong

  WANG Mengyuan, WANG Xiaofeng, DONG Sheng, TAO Shanshan

  2023, 45(2): 1-9. https://doi.org/10.13984/j.cnki.cn37-1141.2023.02.001

  Abstract ( ) PDF ( )

  Extreme wind condition is an important reference for offshore wind turbine design. The calculation of design wind speed is uncertain. In this paper, the uncertainty of extreme design wind speed in Hong Kong was analyzed, and the influence of sample variation on design wind speed was studied. The results showed that the change of sample length or the change of data selection year would affect the calculation results of design wind speed, and the location parameters, scale parameters and variation coefficient would fluctuate to a certain extent when the data selection year changed, and the change trend was opposite. The results provided reference for the design of offshore wind turbine.
• Initial mechanism and process analysis of storm surge damage to the seawall in Shengli oilfield

  XU Shuailing

  2023, 45(2): 10-17. https://doi.org/10.13984/j.cnki.cn37-1141.2023.02.002

  Abstract ( ) PDF ( )

  Seawall damage threatens the safety of people's lives and properties in coastal areas and the normal operation of oil and gas fields. When wave overtopping takes place during a typhoon storm surge, the seawall damage happens quickly, which makes it difficult to grasp the initial mechanism and process of the damage. Based on the seawall damage took place at pile No.12 in Dongying Shengli oilfield during the storm surge caused by typhoon Lekima, this paper established an indoor physical model to study the initial mechanism and process of seawall damage. The experiment was conducted on two occasions, when the seawall surface was damaged and when it was not. The result showed that, on both occasions, the development of scour holes was an important factor of the seawall damage during typhoon storm surge. The wave floats and pushes the protection surface of the seawall slope through these holes, making the lower loose accumulation exposed and washed away by the wave. This indoor model experiment clarified the initial mechanism and visualizes the process of seawall damage, which provided data support and theoretical basis for subsequent repair and construction of seawalls in oil and gas fields.
• Impact of reclamation on astronomical tide and storm surge in Lianyungang coastal area

  GENG Shanshan, PAN Song, WANG Zhifeng, WU Shuangquan

  2023, 45(2): 18-27. https://doi.org/10.13984/j.cnki.cn37-1141.2023.02.003

  Abstract ( ) PDF ( )

  This paper studied the influence of reclamation on the marine dynamic environment in Lianyungang. Based on the analysis of the measured data of Lianyungang marine station, the hydrodynamic characteristics of Lianyungang before large-scale reclamation were described. The tidal and storm surge models of the Bohai Sea and the Yellow Sea were established by using ADCIRC, and verified by using the tide and storm surge data observed from marine station. The tidal levels before and after reclamation were simulated, and the tidal changes under different conditions were analyzed. The model was used to study the impact of reclamation on the possible maximum storm surge. The results showed that the amplitude of the main component of astronomical tide became larger in the reclamation area, especially the M2 tidal component with the amplitude variation reaching 5.5 cm. Reclamation had a certain impact on the storm surge, the amplitude change was obvious in the reclamation area. The variation range of the probable maximum storm surge around Xuwei port area was -27~18 cm.
• Damage analysis for submarine pipeline impacted by dropped objects and trawling board

  CHU Xinjie, ZHAO Yuliang, JIANG Fengyuan, NING Meng

  2023, 45(2): 28-34. https://doi.org/10.13984/j.cnki.cn37-1141.2023.02.004

  Abstract ( ) PDF ( )

  The non-explicit finite element method (FEM) was used to simulate the impact of ship anchor, dropped objects from operating platform and trawl board on submarine pipelines. A Drucker-Prager (DP) model was adopted to simulate the seabed. The finite element model of dropped objects-pipeline-soil was established. This study analyzed the effects of dropped objects mass, shape, impact velocity, seabed soil properties (elastic modulus, internal friction angle, cohesion), buried depth and trawl board on the plastic deformation of submarine pipeline. The analysis results can provide scientific basis for pipeline design and protection work. Compared with the current specification, this method was more economical and reasonable.
• Experimental study on the transmission coefficient of single row and high and low rows submerged dike under the action of long period swell

  QIN Siliang, LI Yulong, PANG Liang, JIANG Liangwei

  2023, 45(2): 35-42. https://doi.org/10.13984/j.cnki.cn37-1141.2023.02.005

  Abstract ( ) PDF ( )

  In view of the increasing number of overseas projects and the wide application of submerged breakwater in practical projects, the transmission coefficient K_t of single-row and high-low double-row submerged breakwater under long period swell action were studied by means of physical model test. The variation law of transmission coefficient K_t with relative submerged water depth R/H_s, deep water wave steep H_s/gT², relative incident wave high H_s/d, and relative top width B/L were discussed. The applicability of Yang zhengji's empirical formula is verified. By means of MATLAB mathematical software platform, the formula of transmission coefficient K_t was modified. By analyzing the test data, it can be seen that, under the action of long period swell, the transmission coefficient of single-row and high-low double-row submerged breakwater had similar changing rules with different elements, and the relative submerged depth R/H_s was the main influencing factor. The transmission coefficient of high and low double row submerged breakwater were reduced by 2%~14% compared with that of single row submerged breakwater. When the average period was T>15 s, the transmission coefficient of double row and single submerged breakwater is similar. The applicability of high and low double row submerged breakwater was poor. Under the same working conditions, the Yang Zhengji’s formula can be used in the preliminary verification of similar projects. The empirical formula of single-row and double-row submerged breakwater had a good fitting effect, which can provide a reference for similar projects.
• Dynamic mechanical analysis and structural optimization of supporting piers of floating production storage and offloading under different sea states

  HUANG Zhiqiang, HUANG Shan, LI Qin, CHEN Yan, HUANG Qin, TANG Chongyao

  2023, 45(2): 43-54. https://doi.org/10.13984/j.cnki.cn37-1141.2023.02.006

  Abstract ( ) PDF ( )

  As an offshore oil production base, floating production storage and offloading is affected by various harsh and varied sea conditions during sea service, which may lead to failure and failure of the module buttress structure, and the upper module has the risk of overall overturning. Therefore, this paper takes the South China Sea area with a lot of floating production storage and offloading as an example to carry out the dynamic mechanical analysis and experimental study of the module piers of floating production storage and offloading under different sea conditions.The three-dimensional model of the upper module was established by finite element simulation, and the dynamic mechanical analysis of the pier structure was carried out. The dangerous parts of the pier were found according to the simulation cloud map, and the model test was carried out by simulating various sea conditions with six degrees of freedom platform to verify the correctness of the simulation. On this basis, the module pier is safely checked and structurally optimized. The test and simulation results show that the dangerous part of the pier is the rib plate and the bracket, and the stress concentration and maximum stress value of the dangerous part can be effectively reduced by thickening and chamfering. The test method of the six-degree-of-freedom platform simulation sea state proposed in the paper It can be used for dynamic mechanical analysis of single-module model. The research results provide reference for the mechanical analysis and design of the upper module pier of floating production storage and offloading.
• Sedimentary records of heavy metals in the middle reaches of the Yalu River since 1939

  LIU Yue, CHENG Yan, DU Yixiao, LI Hongjun, LI Fuxiang, Sun Yufeng

  2023, 45(2): 55-63. https://doi.org/10.13984/j.cnki.cn37-1141.2023.02.007

  Abstract ( ) PDF ( )

  A core sample was collected at the depth of 40 m in the middle reaches of the Yalu River. The radioactive dating by ²¹⁰Pb and ¹³⁷Cs, the vertical particle size and content of the heavy metals were measured after the sample dividing. The comprehensive results indicated that the deposition records of the 8 heavy metals in the Shuifeng Reservoir presented 4 stages characteristics since 1939. The first stage was related to Anti-Japanese War and Resist US Aggression and Aid Korea War from 1939 to 1951, the second stage to slow economic recovery from 1951 to 1979, the third stage to rapid economic development and obvious environmental problems from 1979 to 1994, and the fourth stage to the synchronous development of economic and ecological environment protection from 1994 to 2018. The results of the tracking provenance were that the Cd and Hg were mainly natural sources, the Ni, Pb, Cu, As were somewhat affected by the agricultural activities but still overall natural sources, the Cr was mainly from the processing industry and the Zn was mainly from the mining industry. The pollution degrees of the heavy metals were evaluated with the method of the index of geoaccumulation. The results were that the overall pollution level was not high, only with slight pollution in Zn. But attention should be paid to the Zn pollution because of the exchange of the sediments and the water. The finding could fill the gap of studying the heavy metal pollution in the middle and upper reaches of the Yalu River basin, and also provide an important reference for the judgment of heavy metal deposition, tracking provenance, and the influence of human activities in remote border areas.
• Pile scour calculation and site selection for Haiyang offshore wind farm in Shandong

  WANG Chunyang, LIU Pan, WANG Qifeng, LU Xiaodong, WANG Kelei, ZHANG Zehua

  2023, 45(2): 64-71. https://doi.org/10.13984/j.cnki.cn37-1141.2023.02.008

  Abstract ( ) PDF ( )

  The problem of local scouring caused by waves and the current scouring of offshore wind power pile foundations is important. Based on the measured surface sediment, long-term meteorological, wave and tidal data, the scour characteristics of pile foundations in Haiyang offshore wind farm area under different dynamic conditions, deployment schemes and environmental conditions were calculated by using the empirical equation of local scour of pile foundations. And then the consideration factors of pile foundation location were analyzed in this paper. The results showed that the wind farm area was a locally weak scouring area. The scour depth of the pile pier ranged from 0.62 m to 2.25 m with a maximum of 2.23 m under 3 constant wave directions of 2 m and 6 m pile pier diameter. Besides, the pile column diameter had a positive correlation with the scouring depth, and the fan diameter of 8 m had a negligible impact on the regional scouring environment. In addition, since the waves in the wind farm area had a significant impact on the seabed, the scour depth of the pile foundation should be calculated using a formula that incorporates wind, waves and currents. The characteristics of the seabed stability, wind energy, pile diameter, seabed soil stability and other characteristics should be comprehensively considered when choosing the location of the pile.
• Morphological and histological descriptions of Girella punctata Grayy digestive system

  HE Ruiqi, XIE Zhongwei, ZHU Xunfeng, SHI Hongjuan, ZHU Chunhua, LI Guangli, HUANG Yang

  2023, 45(2): 72-79. https://doi.org/10.13984/j.cnki.cn37-1141.2023.02.009

  Abstract ( ) PDF ( )

  In order to explore the digestive physiological characteristics of Girella punctata, its main organs and tissues including oropharyngeal cavity, esophagus, stomach, intestine and liver of the digestive system were studied with morphological and histological methods. The studied included also the relationship between the organic structure and their functions. The results showed that the tissue structure of esophageal cavity wall includes mucosa layer, submucosa, muscle and serosa layers from inside to outside, similar to that of most bony fishes. The stomach is U-shaped, being mainly composed of three parts, cardia, stomach body and pylorus. Mucosal layer and submucosa protrude to the stomach cavity, forming eight protruding wrinkled walls. Mucosal layer is rich in glands, and the inner wall of digestive tract is wrinkled with a thick muscular layer. The intestine is divided into foregut, midgut and hindgut, and the ratio of intestine length to body length is 1.54 ± 0.06. Six irregular folds and protrusions are formed inward in the cavity wall. The liver consists of parenchyma and stroma, which is divided into left and right lobes. The structural characteristics of the digestive system of G. punctata are compatible with its omnivoral behavier.
• Physiological responses of Gracilaria chilensis to copper stress

  HUANG Zhongjian, SUN zuodeng, ZHONG Zhihai

  2023, 45(2): 80-86. https://doi.org/10.13984/j.cnki.cn37-1141.2023.02.010

  Abstract ( ) PDF ( )

  Heavy metal copper is an important pollutant and copper is high toxicity and wide-spread. The effects of copper stress on the growth, photosynthesis and chemical constituents of Gracilaria chilensis were studied indoor at different copper concentrations of 0, 25, 50, 100, 250 and 500 μg/L, hoping to find the physiological responses of Gracilaria chilensis to copper stress. The results showed that copper stress inhibited the relative growth rate (RGR), the inhibition increased with increasing levels of copper concentration, and the RGR become negative when copper concentration increased to 500 μg/L. The photosynthetic rate and soluble protein contents significantly decreased with increasing levels of copper concentration, but the contents of chlorophyll a and carotenoid increased. The markedly increasing contents of MDA under copper stress (P<0.05), illustrating Gracilaria chilensis suffered serious damage from copper stress, and the damage became more serious with increasing levels of copper concentration.
• Research Repor
• Distribution characteristics of the Kuroshio temperature front in the East China Sea

  YANG Fan, WANG Hua, GAO Wendian, YANG Xiaoxin, WANG Xing

  2023, 45(2): 87-93. https://doi.org/10.13984/j.cnki.cn37-1141.2023.02.011

  Abstract ( ) PDF ( )

  By analyzing WOA13 season average data, the seasonal variation of the Kuroshio temperature front in the East China Sea under different depth was studied by using absolute gradient method. It showed that the Kuroshio temperature front had significant seasonal variation, there were several high value area of range and intensity in different depth, and there were changes with season. In the depth less than 200 m, the high value area moved from surface to 100 m depth follow the order of winter, spring and summer. In the depth deeper than 200 m, the high value area existed in 400 m depth layer, but the seasonal variation cannot be found.
• Analysis of tidal current characteristics in the sea near the Yellow River Mouth

  YE Zuchao, YANG Na, CUI Liwei, MA Xin

  2023, 45(2): 94-100. https://doi.org/10.13984/j.cnki.cn37-1141.2023.02.012

  Abstract ( ) PDF ( )

  As an important estuarine region in China, the Yellow River Estuary plays an important role in estuarine engineering construction and environmental protection. In this paper, the tidal current characteristics around the Yellow River Estuary during the spring tide period were studied by means of quasi-harmonic analysis and data statistics. During the observation period, the velocity and direction of each station had a great difference, and the average duration of tidal surge was larger than that of ebb tide. The results of harmonic analysis showed that the tidal current was semi-diurnal. Most of the stations were dominated by re-flow, and the shallow water tidal current had little influence. The residual flow velocity at each station was observed to be within the range of 0-3cm/s. The vertical residual flow velocity at each station basically followed the trend of gradually decreasing from surface to bottom, and the residual flow was dominated by S-SSW direction.
• Community structure and spatio-temporal distribution of fishery resources in the coastal water of Huludao

  LIU Xiao, LI Jiye, WANG Peng, JIAN Xiaoyang, WEN Guoyi

  2023, 45(2): 101-107. https://doi.org/10.13984/j.cnki.cn37-1141.2023.02.013

  Abstract ( ) PDF ( )

  In order to describe the community structure and characterize the spatio-temporal distribution of the fishery resources in the coastal waters of Huludao, we analyzed the data collected in bottom trawl surveys on 4 different voyages in April, May, August and October 2019 in the coastal water of Huludao. There were 42 species found in the survey, which included 21 species of fish, 17 species of crustaceans and 4 species of cephalopods. The dominant species were Chaeturichthys stigmatias, Cynoglossus joyneri and Oratosquilla oratoria. The species Shannon-Wiener diversity index (H′) , evenness index (J) and richness (D) were calculated based on the survey data. H′ ranged from 1.61 to 2.56 with an average of 1.96. J varied between 0.46 and 0.68 with an average of 0.62. The index D ranged from 0.81 to 1.34 with an average of 1.01. The diversity was the highest in October and the lowest in August. The main composition of the total catch was shrimps and fishes, and the proportion of cephalopods and crabs was relatively small. The fish species belonged to 5 orders and 13 families, which mainly comprised warm water and warm temperate species. The source abundance was the most in August, 27,772g/h, which was followed by that in October (7,856g/h), in May (1,542g/h) and was the least in April, 1,164g/h. The abundance of fishery resources varied with months. The high abundance of fishery resources moved from the north coastal water area to the south water from April to October. This study was carried out, aiming to provide a scientific basis for the rational development and protect fishery resources in the coastal water of Huludao.
• Relationship between zooplankton community structure and environmental factors of Changli Golden Coast National Nature Reserve in spring and summer

  YU Yang, GUO Xiaqing, LIU Xianbin, ZHAO Xinggui

  2023, 45(2): 108-115. https://doi.org/10.13984/j.cnki.cn37-1141.2023.02.014

  Abstract ( ) PDF ( )

  In order to understand the community structure of zooplankton and its relationship with environmental factors of the coastal water of Changli Golden Coast National Nature Reserve, two comprehensive ecological and environmental surveys were conducted in spring (May) and summer (August), 2019. In total, 16 species of zooplankton and 12 species of planktonic larvae were identified on two cruises in spring and summer, and 28 species were identified. The mean abundance and biomass of zooplankton in spring (175 ind./m³ and 24.53 mg/m³) were significantly lower than those in summer (1511 ind./m³ and 229.98 mg/m³). The Shannon-Wiener Biodiversity Index in summer (2.00) was lower than that in spring (2.48), and the Pielou evenness index in summer (0.54) was also lower than that in spring (0.78). Canonical correspondence analysis showed that the salinity, NH₄-N, pH, COD_Mn, NO₂-N and transparency were important environmental factors affecting the community structure of zooplankton. Compared with the historical data, the number and biomass of zooplankton in the investigated sea area showed a downward trend, but the main dominant species were basically consistent with the previously reported.
• Meiofaunal community features and their influencing factors at beaches of Penglai and Weihai

  YANG Lili, Li Yanan, RUAN Zhen, HENG Xingyu, MU Fanghong

  2023, 45(2): 116-122. https://doi.org/10.13984/j.cnki.cn37-1141.2023.02.015

  Abstract ( ) PDF ( )

  An investigation was conducted on meiofauna at Penglai swimming beach in Oct., 2016, and at Weihai Naxiang Beach in July, 2018. At Penglai swimming beach, the average abundance was 632.83±719.34 ind·10cm^-2, and the average biomass was 726.09±707.08 μg dwt·10cm^-2. A total of 12 meiofauna groups were identified there. At Weihai Naxiang beach, the average abundance was 3461.96±2121.20 ind·10cm^-2, and the average biomass was 7617.35±5804.83 μg dwt·10cm^-2. A total of 10 meiofauna groups were identified at this beach. There were significant differences of meiofauna abundance and mieofauna biomass among different tidal zones of the two beaches. At Penglai swimming beach, the meiofauna abundance increased from low tidal zone to middle tidal zone and then to high tidal zone, and the meiofauna biomass increased from middle tidal zone to low tidal zone and then to high tidal zone. At Weihai Naxiang beach, the meiofauna abundance and biomass increased from middle tidal zone to low tidal zone and then to high tidal zone. Pearson correlation analysis showed that there is no significant correlation between meiofauna abundance and environmental factors at the Penglai swimming beach, and the abundance of meiofauna at Weihai Naxiang beach is closely related to the grain size characteristics. BIOENV analysis showed that the combination of temperature, pH, dissolved oxygen, median grain size and coefficient of skew best explains the meiofauna community structure at Penglai swimming beach, and the combination of pH, the organic matter content and coefficient of skew best explains the meiofauna community structure at Weihai Naxiang beach.
• Distribution characteristics of Halophila beccarii resources in Danzhou Bay, Hainan and their influencing factors

  GUO jinyu, GENG Xiaoxiao, YIN Lei, CHEN Shiquan, CAI Zefu, WU Zhongjie , WANG Daoru

  2023, 45(2): 123-132. https://doi.org/10.13984/j.cnki.cn37-1141.2023.02.016

  Abstract ( ) PDF ( )

  The distribution characteristics and their influencing factors of the seagrass resources in Danzhou Bay were comprehensively surveyed. The results showed that only one seagrass species, Halophila beccarii Asch, inhabits Danzhou Bay. The total distribution area is about 489 hm², with an average coverage of 8.46 %, an average shoot density of 2327.98 ind./m², and an average biomass of 1.57 g/m². The seagrass mainly distributes in the coastal waters around Xinying Mangrove Reserve at the inner end of the bay. The growth of H. beccarii in Danzhou Bay is mainly affected by the heavy metal Cu, and then by water depth. There is a very significant positive correlation among heavy metals. As were inferred, these influences may come from the sewage discharge of nearby shrimp ponds and tidal transport and migration. Aiming to protect H. beccarii in Danzhou Bay, we propose to improve the function of mangrove nature reserve by taking it as the protection object, strengthen the management of protected areas, and control the emission of pollution sources and human interference.
• Structural characterization of phytoplankton community in adjacent waters of Hanjiang Rongjiang Estuary, Shantou and determination of its relationship with environmental factors

  LI Jigang, YANG Zhenxiong, GE Song, ZHAO Chenhui, FU Jing, CHEN Mianrun

  2023, 45(2): 133-141. https://doi.org/10.13984/j.cnki.cn37-1141.2023.02.017

  Abstract ( ) PDF ( )

  Based on the structure of phytoplankton community in the adjacent waters of Hanjiang Rongjiang Estuary in Shantou in Nov. 2020 (autumn) and April 2021 (spring), we primarily analyzed the change trend of community species composition, abundance distribution and diversity, as well as the relationship between community composition and environmental factors. There were 2 phyla, 100 species of phytoplankton found in spring, mostly belonging to diatom group. In spring, the phytoplankton abundance varied between 169.23 × 10³ and 654.00 × 10³ cells/m³ with an average value of 388.01×10³ cells/m³. Ten species dominated spring seawaters which included Chaetoceros lorenzianus; Pseudo-nitzschia pungens; Chaetoceros affinis among others. In autumn, 4 phyla, 89 species of phytoplankton were found, and most of them belonged to diatom. In autumn, phytoplankton abundance varied between 33.89 × 10³ and 2244.00 × 10³ cells/m³, with an average of 248.88×10³ cells/m³. The dominant species was less in autumn than in spring. Six species dominated autumn seawater, which included Skeletonema costatum; Thalassionema nitzschioides; Paralia sulcata among others. The abundance and number of species of phytoplankton in spring were higher than those in autumn, and the seasonal changes of dominant species were obvious. Through redundancy analysis (RDA), it was concluded that the main environmental factors affecting the distribution of phytoplankton in spring were nitrogen nitrate (NO₃-N), ammonia nitrogen (NH₃-N), inorganic nitrogen and inorganic phosphorus. The main environmental factors affecting the distribution of phytoplankton in autumn were nitrogen nitrate (NO₃-N), inorganic nitrogen and temperature.
• Investigation on Anisakidae nematode parasitic status of Coilianasus at the early stages of banning fishing in Yangtze River

  CHENG Xin, YANG Yanping, YING Congping, MA Fengjiao, DENG Yan min, LIU Kai

  2023, 45(2): 142-149. https://doi.org/10.13984/j.cnki.cn37-1141.2023.02.018

  Abstract ( ) PDF ( )

  To grasp the parasitic status of cilia nematodes in Yangtze River at the beginning of the 10-year fishing ban, a systematic sampling survey of Coilianasus nematodes in the lower reaches of Yangtze River and Yangtze River Estuary was conducted from March to July 2021. The results showed that the parasitic nematode infection rate of C. nasus was 82.10%, the infection intensity was 5.8±9.5 nematodes/tail, and the infection abundance was 5.1±9.1 nematodes/tail. Among the investigated fish, the highest percentage (72.30%) was 1~10 nematodes/tail. The nematodes were found on the stomach, intestine, pyloric cyst, abdominal cavity and liver of C. nasus. The nematode parasitism in C. nasus was correlated with its sizes, survey time and upstream distance, and the intensity of infection increased and then decreased as the size of C. nasus increased. The infection rate and intensity of infection reached the highest in July (p<0.05). In addition, the intensity of infection decreased and then increased as the distance upstream of C. nasus increased. The intensity of infection was the highest in Anqing (p<0.05) while the infection rate was the highest in Taizhou. The results of nematode sampling and identification showed that C. nasus was infected with 7 species of 3 genera, including 2 of Anisakis and 4 of Hysterothylacium, 1 and the undefined of Raphidascaris. In summary, we investigated the parasitic status of nematodes in C. nasus at the early stage of the ban, and accumulated a basis for studying the effects of nematode parasitism on its reproductive migration and population replenishment as well as the screening and identification of biomarkers.
• Structural characterization of algal community in modern lakes of west Songnen Plain and identification of its influencing factors

  LIU Jiakang, ZHANG Xinrong, HUO Yuanbo

  2023, 45(2): 150-159. https://doi.org/10.13984/j.cnki.cn37-1141.2023.02.019

  Abstract ( ) PDF ( )

  Lakes are widely developed on the modern Songnen Plain, resulting in significant differences in algal communities. It is important to study the relationship between different lake types and algal communities by analyzing the relationship between algal community structure and its influencing factors in modern lakes. The algal community structure of Chaersen Lake, Nierji Lake and Zhongnei Lake in the west of Songnen Plain is analyzed with both old and new methods. At the same time, when the physical and chemical properties of water such as metal ion content, salinity, pH value and temperature were taken into account, we found that the algal community in Chaersen Lake is characterized by diatoms, cyanobacteria and green algae, and the content of diatom is relatively large. The algal community structure in Nierji Lake is characterized by diatom, cyanobacteria and green algae; the content of cyanobacteria and green algae is higher than that in Chaersen Lake; and the algal community in Zhongnei Lake is characterized by cyanobacteria, green algae and diatom. The growth of cyanobacteria in plain lakes was vigorous but the growth of diatoms was inhibited. The growth of diatoms in mountain lakes was vigorous but the growth of cyanobacteria was inhibited. Cyanobacteria grew vigorously in lakes with high salinity. The growth of cyanobacteria was relatively vigorous and the growth of diatoms was inhibited in lakes with high content of strontium. Lakes with high levels of copper and barium in the water promoted the growth of green algae. These differences may associate with the geographic difference and water characteristics of lakes.
• Research Review
• Construction of evaluation system for rigs-to-reefs site selection ——taking Dongying offshore area as an example

  ZHU Baixin, GAO Zengwen, ZHENG Xilai

  2023, 45(2): 160-169. https://doi.org/10.13984/j.cnki.cn37-1141.2023.02.020

  Abstract ( ) PDF ( )

  Rigs-to-Reefs is an important means to realize the disposal of decommissioned platforms and the conservation of fishery resources. Reasonable site selection is the key work to ensure the smooth implementation of rigs-to-reefs programs. However, there is no corresponding evaluation system for site selection in China. By referring to domestic and foreign literature and expert experience, the rigs-to-reefs site selection evaluation indicators were selected. Based on the combination method of AHP and fuzzy comprehensive evaluation method, rigs-to-reefs site selection evaluation system suitable for domestic platform and marine environment characteristics was constructed, and the suitable area of the rigs-to-reefs near Dongying was optimized. The results showed that a total of 15 representative rigs-to-reefs site selection evaluation indicators were selected. The rigs-to-reefs site selection evaluation was significantly different from the conventional artificial fish reefs in terms of water depth and stakeholders. The indicators of water depth and marine functional zoning were the main factors affecting the rigs-to-reefs site selection evaluation. The site selection evaluation results of the sea area in the north of Dongying were better than those in the east. The evaluation system reasonably showed the suitability of the Dongying offshore area as rigs-to-reefs area. The research results can provide technical support for the selection of rigs-to-reefs demonstration areas in Dongying, and provide a reference for the formulation of domestic rigs-to-reefs site selection programs.
• Study on land and sea integrated approaches of ocean spatial planning —— Inspiration from the Governing Coastal Resources Implication for a Sustainable Blue Economy

  GAO Jinzhu, ZHANG Hongfen, YANG Xiao, ZHANG Kuncheng, CHENG Yongxin, WANG Zhiwen, TIAN Shizheng

  2023, 45(2): 170-175. https://doi.org/10.13984/j.cnki.cn37-1141.2023.02.021

  Abstract ( ) PDF ( )

  After the "integration of multiple plans", China's marine spatial planning system has been initially remodeled, but there are still some problems in the implementation of land-sea overall planning, such as lack of integrated land-sea spatial management mechanism, insufficient consideration of land-sea interaction in planning, and lack of integrated protection of land-sea ecosystems. This paper reviews the main points of the report Governing Coastal Resource——Implications for a sustainable Blue Economy by the International Resources Council,based on the current situation and problems of China's land spatial planning and management. Its specific enlightenment to the implementation of land and sea planning in China is summarized. Suggestions such as the overall implementation of national strategies by land and sea, the healthy development of land and sea industries, the implementation of integrated protection and utilization strategies of land and sea in layers, and the implementation of coastal zone management based on ecosystems are proposed. The results are helpful to serve China's marine space planning and management.
• A comparative study on integrated marine ecosystem-based management: Xiamen coastal zone integrated management plan of China and Florida everglades restoration program of USA as comparative examples

  CHU Xiaolin, XU Chunfeng

  2023, 45(2): 176-183. https://doi.org/10.13984/j.cnki.cn37-1141.2023.02.022

  Abstract ( ) PDF ( )

  Marine ecosystem-based management is a new concept in and a model of marine management. It overturns the traditional marine management concept of single protection object, advocates the protection of marine environment and resources from the perspective of marine ecosystem, and aims to realize the coordinated and sustainable development of marine ecosystem conservation and human development activities. Xiamen coastal zone comprehensive management plan of China and Florida everglades wetland projects of UAS have adopted the ecological system-based comprehensive marine management. We compared their basic situation, policies and regulations, management mode and management measures of the connection and distinction, trying to provide knowledges for other regions of China and USA, identify the problems existing in practice, and accordingly put forward comprehensive marine management. We proppsed that our management should deepen management philosophy, formulate special legislation, set up specialized departments, implement public participation among others.
• Effect and heterogeneity evaluation of national marine economic development pilot policy: Empirical test basing on difference in difference model

  WANG Weiping, CHEN Xiaowen, MA Xueting

  2023, 45(2): 184-191. https://doi.org/10.13984/j.cnki.cn37-1141.2023.02.023

  Abstract ( ) PDF ( )

  The national marine economic development pilot policy is an important measure for China to build a strong marine country. From 2010 to 2013, China has established five pilot provinces and cities. Based on the provincial panel data of 11 coastal provinces and cities in China from 2005 to 2016, in this paper, we carried out an empirical study on the marine economic growth effect of the national marine economic development pilot policy using the difference in difference model, and further discussed the regulatory role of the level of marine science and technology innovation in the impact of the pilot policy on marine economic growth. We found that (1) the national marine economic development pilot policy can significantly promote marine economic growth; (2) the stronger the marine economic strength of the pilot provinces and cities, the greater the pulling effect on the region, and the national marine economic development pilot policy plays a greater role in promoting the marine economy of the Bohai Rim Economic Zone and the Pan-Pearl River Delta Economic Zone; (3) the level of marine science and technology innovation has a significant positive regulatory effect, and the improvement of the level of marine science and technology innovation will strengthen the positive effect of the national marine economic development pilot policy on marine economic growth.
• Research on the application of spatial planning and grading for accounting of state-owned sea area resources assets

  SANG Xinchun, LIANG Xiangbo, LI Xuefeng, WU Shanshan, YUE Qi, WANG Xiuna, DONG Yuee

  2023, 45(2): 192-200. https://doi.org/10.13984/j.cnki.cn37-1141.2023.02.024

  Abstract ( ) PDF ( )

  Based on the overall analysis of the zoning theory of the territorial spatial planning system and the classification and grading method of sea areas, this paper explored the connection and application of territorial spatial planning and classification in the accounting of sea area resources and assets owned by the nation through comparative study, induction and deduction, empirical analysis and other methods. According to the study, the applications of quality homogenization and function homogenization in the accounting of sea area resources and assets were mainly through identifying the delineation of sea area functional areas and equal (level) delineation ranges, screening reasonable samples and weighting by area to calculate the average price of homogeneous regions. At the same time, through the empirical calculation, it was believed that the application of territorial space planning results and grading technology could enrich the national ownership of maritime resources assets accounting system, make up the weak links, and improve the accuracy and scientific nature of resource assets accounting with certain innovation and foresight.