Seasonal differences of terrigenous material transport in Nanliu Estuary and their effects
DUAN Xiao-yong1, GAO Fei1, LIU Jin-qing1, YANG Lei2, YIN Ping1, CAO Ke1, LI Yan-xia3, DONG Chao2
1. Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao Institute of Marine Geology, China Geological Survey, Qingdao 266237, China; 2. Zhejiang Institute of Hydrogeology and Engineering Geology, Ningbo 315012, China; 3. Environment Research Institute, Shandong University, Qingdao 266237, China
Abstract：The variations of organic matter content and isotopic composition in the surface sediments of the Nanliu River estuary during the wet season (July 2015) and the dry season (April 2016) were investigated to reveal the seasonal differences of terrestrial materials transported into the sea, and to evaluate their influences on the offshore environment. The results showed that the content of suspended particulate matter (SPM) decreased gradually with the increase of water depth in the dry season (average value: 0.030g/L). In the wet season, the content of SPM was lower before the flood (average value: 0.020g/L), and significantly increased after the flood (average value: 0.047g/L). It is indicated that waves and tides in dry seasons have greater disturbance to the surface sediments, resulting in a large amount of SPM, while waves and tides in wet seasons have less influence, and SPM content is mainly controlled by flood. The average contents of total organic carbon (TOC) and total nitrogen (TN) in sediments in different seasons were similar, and the average TOC content was close to 0.46%. The TN content in wet season and normal season was 0.054% and 0.062%, respectively, but the spatial distribution was significantly different. The content of organic matter is higher in the semi-closed bay east of the estuary in the wet season, and the distribution of organic matter is patchy in the dry season. According to the characteristics of isotopic compositions, terrigenous organic matter was transported outward from the mouth of the river during the wet period, and sedimentary zone with high terrigenous organic matter was formed southward along the estuary, and marine organic matter was the main source in the semi-closed bay. In dry season, the contribution of terrigenous organic matter decreased rapidly from estuarine outward. In the study area, the sedimentary environment was mainly characterized by rapid sediments accumulation after being transported outward from the estuary in wet seasons, and strong mixing under the action of waves and tides in dry seasons, which contributes to the obvious seasonal differences in the environmental quality of surrounding sea waters. Therefore, it is necessary to fully consider how to effectively carry out seasonal regulation in the future water environment treatment process.
段晓勇, 高飞, 刘金庆, 杨磊, 印萍, 曹珂, 李艳霞, 董超. 南流江口陆源物质输送的季节性差异及其影响[J]. 中国环境科学, 2023, 43(2): 800-808.
DUAN Xiao-yong, GAO Fei, LIU Jin-qing, YANG Lei, YIN Ping, CAO Ke, LI Yan-xia, DONG Chao. Seasonal differences of terrigenous material transport in Nanliu Estuary and their effects. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(2): 800-808.
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