水科学进展2026，Vol.37Issue(2)：323-336,14.DOI:10.14042/j.cnki.32.1309.2026.02.011
太湖流域源头区嵌套式实验流域径流成分解析
Runoff component analysis of nested experimental catchments in the headwater region of the Taihu Lake Basin
摘要
Abstract
Runoff component composition reflects the functioning and characteristics of catchment hydrological systems and insufficient understanding of runoff generation processes and their components has constrained the development of runoff generation theories.Therefore,this study investigates runoff generation processes and component composition in humid mountainous regions using a nested experimental observation system in the headwaters of the Taihu Lake Basin.In-situ hydrological observations,isotope geochemical tracing,and digital filtering were integrated to analyze runoff composition characteristics and their responses to precipitation.Plot-scale observations indicate that surface runoff exceeds 50%of total runoff in both wet and dry years.In contrast,isotope tracing results reveal that quick flow contributes less than 50%.This discrepancy implies that steep terrains and shallow soils promote saturation-excess overland flow and interflow exfiltration,yielding a substantial contribution of old water to surface runoff.Due to the small catchment area and limited storage and attenuation capacity of channels and valley bottoms,runoff characteristics exhibit minimal scale effects.A unit increase in annual precipitation increases the depths of direct runoff(surface runoff plus interflow)and baseflow by 0.68 and 0.23 units,respectively,while greater flood season precipitation reduces the baseflow index.Overall,the proposed integrated analytical framework provides a comprehensive assessment of runoff component dynamics in humid catchments and offers a scientific basis for advancing runoff generation theory and prediction in mountainous catchments.关键词
径流成分/产流特性/基流分割/壤中流/嵌套流域Key words
runoff components/runoff yielding mechanism/baseflow separation/subsurface stormflow/nested catchments分类
天文与地球科学引用本文复制引用
李文强,勾建峰,杨海,顾卫明,沈旭辉,韩小乐,刘金涛..太湖流域源头区嵌套式实验流域径流成分解析[J].水科学进展,2026,37(2):323-336,14.基金项目
国家自然科学基金项目(42371042 （）
42507102) The study is financially supported by the National Natural Science Foundation of China(No.42371042 （）
No.42507102). （）
