水科学进展2024，Vol.35Issue(2)：289-297,9.DOI:10.14042/j.cnki.32.1309.2024.02.010
考虑水力连通的羌塘内流区洼地单元提取与分类
Extraction and classification of endorheic units in the Qiangtang endorheic basin considering hydraulic connectivity
摘要
Abstract
The Qiangtang endorheic basin,the largest endorheic basin in the Tibetan Plateau,is experiencing a rapid evolution of its lake system structure and water quantity owing to climate change.Considering the impacts of climate change on the boundaries of endorheic units,we propose a novel delineation algorithm introducing the Joint Elevation-Area Threshold(JEAT)to address delineation issues caused by climate change.Firstly,by observing the reorganizations and fluctuations in lake levels in the Qiangtang endorheic zone,we determined that the JEAT was 10 m and 50 km2,respectively.Next,a total of 163 endorheic units with reasonable contribution area and permanent boundaries were identified.The results demonstrated that the algorithm is suitable for extracting endorheic units on a large scale,and the extraction accuracy is superior to that of other existing algorithms and datasets.Subsequently,163 endorheic units were categorized into five main types based on weak watershed type,with the upstream-downstream connected type(Type Ⅱ)and alpine type(Type Ⅳ)being the main ones.Pit type(TypeⅤ)watersheds tended to mostly coexist with other types,exhibiting a more intense response to the connectivity characteristics of large depressions at different periods.关键词
洼地单元/流域重组/高程-面积联合阈值/气候变化/羌塘内流区/青藏高原Key words
endorheic units/drainage reorganization/Joint Elevation-Area Threshold/climate change/Qiangtang endorheic basin/Tibetan Plateau分类
天文与地球科学引用本文复制引用
刘金涛,倪飞宇,马顺刚,康有,吴鹏飞,冯美艳..考虑水力连通的羌塘内流区洼地单元提取与分类[J].水科学进展,2024,35(2):289-297,9.基金项目
国家自然科学基金资助项目(92047301) （92047301）
中国电建集团成都勘测设计院有限公司资助项目(PB3521) The study is financially supported by the National Natural Science Foundation of China(No.92047301)and the Technology Project of POWERCHINA Chengdu Engineering Corporation Limited,China(No.PB3521). （PB3521）
