文献类型：期刊文献

英文题名：Water turbidity dynamics using random forest in the Yangtze River Delta Region, China

作者：Lin, Xingna[1] Wu, Ming[1] Shao, Xuexin[1] Li, Guozhi[2] Hong, Yifeng[2]

第一作者：蔺星娜

通信作者：Wu, M[1];Hong, YF[2]

机构：[1]Chinese Acad Forestry, Res Inst Subtrop Forestry, Hangzhou 311400, Peoples R China;[2]East China Acad Inventory & Planning, Natl Forestry & Grassland Adm, Hangzhou 311400, Peoples R China

年份：2023

卷号：903

外文期刊名：SCIENCE OF THE TOTAL ENVIRONMENT

收录：;EI(收录号：20233614689172);Scopus(收录号：2-s2.0-85169795391);WOS:【SCI-EXPANDED(收录号:WOS:001068879000001)】；

基金：This research was funded by the Special Fund for Cooperation of Zhejiang Province and the Chinese Academy of Forestry, grant number 2021SY03, the Foundation of Research Institute of Subtropical Forestry, Chinese Academy of Forestry, grant number RISFZ-2023-01, and the Foundation of East China Academy of Inventory and Planning, National Forestry and Grassland Administration, grant number HDY22N012.

语种：英文

外文关键词：Turbidity; Random forest; Dominant drivers; Urbanisation; Wastewater discharge

摘要：Turbidity is a water quality indicator that is essential for the sustainable development of aquatic ecosystems and the protection of biodiversity. The turbidity of different water surfaces and its response mechanisms to regional climatic factors and human activities in the Yangtze River Delta Region (YRDR), an important rapid economic development region in China, remain poorly understood. To enhance the knowledge of turbidity variations and dominant drivers of YRDR water surfaces, a complete long-term turbidity series was obtained using Landsat images from 1990 to 2020. The results show that the turbidity trend differed from-1.3 NTU/yr to 0.7 NTU/yr in different water surfaces. Turbidity decreased significantly in the mainstream of the Yangtze River (MYR), aquaculture ponds (AP) and other water bodies, whilst increasing significantly in the medium lakes (ML) and mainstream of the Qiantang River (MQR). Meanwhile, no significant changes in turbidity were observed in the great lakes (GL) and small lakes (SL). Rather than climatic factors, urbanisation and decreasing wastewater discharge were the dominant drivers of turbidity trends during the study period. In addition, ecological engineering in AP increased water transparency. The Three Gorges Dam also decreased turbidity in MYR. Increasing turbidity in the downstream of MQR was driven by increasing seasonal water surfaces and reclamation projects near Hangzhou Bay. GL faced no significant increase in turbidity due to the offset of afforestation to urbanisation induced turbidity increase. These findings provide important information for government decision-making for subsequent aquatic environmental protection and restoration in the YRDR.