泥沙研究2025，Vol.50Issue(2)：1-9,9.DOI:10.16239/j.cnki.0468-155x.2025.02.001
洞庭湖区三口河道自然岸线演变过程与主控因子研究
Evolution processes and control factors of natural shorelines of three-outlet rivers in the Dongting Lake Area
摘要
Abstract
Owing to the dual influence of natural and human factors,the runoff and sediment flux through the three-outlet rivers in the Dongting Lake area have decreased and the water level has dropped.The adjustment of river regime has resulted in the corresponding changes of the natural shoreline.In order to correctly under-stand the evolution processes of natural shoreline,multi-source remote sensing imageries were used to extract the waterside boundaries of vegetation zones in 1986,1990,2000,2010,and 2020 of the Songzi River,Hudu River,and Ouchi River through NDVI,MVC,and the threshold division method combining Otsu method and visual interpretation.Using the DSAS in ArcGIS,the EPR of natural shoreline migration is calculated by river segment.The results show that the natural shoreline of the three-outlet rivers mainly migrates to the in-channel direction during the study period.The natural shoreline of the east branch of the Songzi River has the largest migration rate.The erosion of the left shoreline at the low water level and the sediment deposition at high water level are the main causes of the natural shoreline changesin the Songzi River inlet and Ouchi River inlet,re-spectively.关键词
洞庭湖区/三口河道/自然岸线/迁移速率/数字岸线分析系统Key words
Dongting Lake area/three-outlet rivers/natural shoreline/migration rate/Digital Shoreline Analy-sis System分类
水利科学引用本文复制引用
白宽宽,李志威,王在艾,张鹏..洞庭湖区三口河道自然岸线演变过程与主控因子研究[J].泥沙研究,2025,50(2):1-9,9.基金项目
国家重点研发计划项目(2023YFC3209502) （2023YFC3209502）
湖南省重大水利科技项目(XSKJ2022068-12) （XSKJ2022068-12）
湖北省技术创新重点研发计划项目(2023BCB110) （2023BCB110）
