Impacts of human activities on morphological evolution in the Modaomen Estuary, China

作     者：Tiehan Liao Haigang Zhan Xing Wei Weikang Zhan Tiehan Liao;Haigang Zhan;Xing Wei;Weikang Zhan

作者机构：State Key Laboratory of Tropical OceanographySouth China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China University of Chinese Academy of SciencesBeijing 100049China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou)Guangzhou 511458China 

出 版 物：《Acta Oceanologica Sinica》 (海洋学报（英文版）)

年 卷 期：2023年第42卷第5期

页      面：79-92页

核心收录：

学科分类：08[工学] 081502[工学-水力学及河流动力学] 0815[工学-水利工程] 

基　　金：The National Natural Science Foundation of China under contract Nos 41876205,42106169 and 41890851 the Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou)under contract Nos GML2019ZD0305 and GML2019ZD0303 the Project of State Key Laboratory of Tropical Oceanography under contract Nos LTOZZ2102 and LTOZZ2202 

主　　题：Modaomen Estuary morphological evolution human activity quantitative analysis 

摘      要：The morphology of the Modaomen Estuary(ME)has undergone drastic changes in recent decades,and quantifying the contribution of human activities and natural processes is crucial for estuary *** Landsat images,chart data,and hydrological and meteorological data,this study analyzed the evolution of the shoreline and subaqueous topography of the ME and attempted to quantify the extent of the contributions of human *** results show that local human activities dominated morphological evolution in some *** 1973 to 2003,the shoreline advanced rapidly seaward,resulting in approximately half of the water area being converted into *** activity is critical to this process,with the direct contribution of local land reclamation projects reaching more than 85%.After 2003,the shoreline remained relatively stable,probably due to a decrease in land reclamation *** the evolution of subaqueous topography,the shoals in the estuary were heavily silted and gradually disappeared during 1983–2003,and the waterways narrowed and *** average siltation rate decreased from 15.43 mm/a to-1.02 mm/a,indicating that the ME changed from sedimentation to slight *** detecting variations of sediment load,we found that upstream human activities reduced river sediment,while downstream human activities significantly increased sediment input to the ME,leaving little change in the actual sediment input to the ME for a relatively long *** addition,based on the empirical relationship between the sediment input and siltation rate,local human activities influenced the shift in the siltation state more than upstream and downstream human activities *** findings suggest that more attention should be paid to local human activities to improve the estuarine management in the ME.