Content of Coastal Human Activities and Sedimentary Responses in our journal

Published in last 1 year |  In last 2 years |  In last 3 years |  All Please wait a minute... For Selected: Download Citations EndNote Ris BibTeX Toggle Thumbnails Select Sedimentary records of environmental changes in the mussel farming area of Lyuhua Island Meiqun XIAO, Bing DENG, Guosen ZHANG, Jinzhou DU, Qianqian BI J* E* C* N* U* N* S*    2025, 2025 (2): 77-85.   DOI: 10.3969/j.issn.1000-5641.2025.02.008 Abstract （133）   HTML （5）    PDF（pc） （934KB）（12）       Knowledge map    Save This study aimed to investigate the environmental changes in the mussel farming area of Lyuhua Island since the marine aquaculture boom in Shengsi County in 2000. Sedimentary records were established for a sediment core in the bay south of Lyuhua Island. Notably, compared to before 2000, the total nitrogen (TN) content decreased by approximately 23%, and total phosphorus (TP) content also slightly declined, suggesting a decrease in the nutrient levels in the study area. In addition, the stable isotope ratio of organic carbon (δ13Corg) became lighter after the year 2000, indicating a reduction in primary productivity. Combined with dating and grain size composition analysis, the sedimentary environment in this study area was relatively stable. The study area is within the influence range of the Changjiang Diluted Water. However, TN and δ13Corg showed a significant decreasing trend on the sediment surface. These results suggest that the decrease in nutrient levels in the study area can be primarily attributed to removing nutrients by mussel harvesting. Table and Figures | Reference | Related Articles | Metrics | Comments（0） Select Preliminary study on the influence of high-level pond aquaculture effluent discharge on the lateral grain size distribution of beach surface sediments Gaocong LI, Jinling MO, Zhongduo WANG, Jieping TANG, Zhiqiang LI, Yali QI J* E* C* N* U* N* S*    2025, 2025 (2): 86-96.   DOI: 10.3969/j.issn.1000-5641.2025.02.009 Abstract （151）   HTML （2）    PDF（pc） （3270KB）（22）       Knowledge map    Save High-level pond aquaculture activity is common on the sandy coasts of South China. Exploring how its tailwater discharge process affects the sedimentary distribution pattern of the beach is crucial for the sustainable utilization and value-added services of coastal resources. Based on the characteristic values and distribution characteristics of surface sediment grain-size, grain composition, and grain-size parameters, this study explored the similarities and differences in grain-size distribution information between high-level pond beaches and normal beaches in the eastern part of Leizhou Peninsula, as well as the reasons behind them. The results showed that: ① the characteristic grain-sizes (D10, D50, and D90) of normal beaches were relatively close, while the high-level pond beaches exhibited larger differences; ② normal beaches mainly contained fine, medium, and coarse sand with similar content; however, no discernable pattern in the high-level pond beach profiles was observed; ③ the range of average grain-size, sorting coefficient, skewness, and kurtosis of normal beaches were relatively close, while the high-level pond beaches exhibited larger differences; and ④ normal beaches showed a trend of finer average grain-size, better sorting, and more negative skewness from land to sea, while the profiles of the high-level pond beaches mainly exhibited a reverse trend of coarser average grain-size, poorer sorting, and more positive skewness. The intermittent discharge process of tailwater from high-altitude aquaculture and its products, as well as the topography of gullies, were the main reasons for the differences in the lateral distribution of sediment between them and the unaffected beaches. This study provides a typical case of how high-level pond aquaculture activities affect the lateral grain-size distribution characteristics of beach surface sediments, which contributes to a better understanding of the interaction mechanisms between human activities and beach sediment and geomorphic processes. Table and Figures | Reference | Related Articles | Metrics | Comments（0） Select Study on the influence of high-level pond aquaculture effluent discharge on the particle shape distribution of beach sediments Gaocong LI, Mingming YUAN, Jian LIAO, Yali QI, Jieping TANG, Qiong XIA J* E* C* N* U* N* S*    2025, 2025 (2): 97-105.   DOI: 10.3969/j.issn.1000-5641.2025.02.010 Abstract （100）   HTML （2）    PDF（pc） （713KB）（5）       Knowledge map    Save The direct discharge of high-level pond aquaculture effluent onto beaches is a common human activity along the South China coast. Investigating the mechanisms by which such activities affect the distribution patterns of beach sediment information is crucial for the sustainable utilization of coastal resources. This study explored the similarities and differences in the distribution of particle shape parameters between the beach influenced by high-level pond aquaculture and the unaffected beach, along with the reasons behind them, using characteristic values, spatial variation characteristics, and correlations among five particle shape parameters of surface sediments. The results show that: ① the characteristic values of the average particle shape parameters of the two types of beaches are relatively close; ② presence of certain differences in the spatial variation trends of aspect ratio, circularity, and convexity between the two types of beaches, amidst consistent spatial variation trends of symmetry and sphericity; and ③ the relationships between particle shape parameters and between particle shape parameters and grain size parameters in the two types of beaches were not significantly correlated. The discharge process of high-level pond aquaculture effluent and the resulting changes in gully topography alter the flow field and material distribution process of beach profiles, the primary reasons for the differences in particle shape parameters between the two types of beaches. This study provides a case study on how high-level pond aquaculture activities affect the distribution characteristics of beach sediment particle shape information. The findings contribute to a better understanding of the interaction mechanisms between marine aquaculture activities and sandy beach geomorphological processes. Table and Figures | Reference | Related Articles | Metrics | Comments（0）