摘要
以南大洼流域为研究对象,基于水文地貌特征将流域径流划分为地表径流(SR)、地下0~50 cm径流(SSR50)及地下50~100 cm径流(SSR100),通过典型降雨事件下各水体(降雨、土壤水、地下水、分层径流)氢氧同位素-水化学指标测试,结合高分辨率水文气象监测数据,解析了不同下垫面-气象条件下的分层径流形成机制,并耦合水文示踪技术与端元混合模型,揭示了各水源对分层径流贡献比例的动态变化。结果表明:不同下垫面-气象条件下分层径流产流机制及水分来源差异显著,湿润-多段式降雨模式下多呈超渗和蓄满的混合产流模式(SR大于SSR100大于SSR50),湿润-短时强降雨模式下以地表的超渗产流为主导(SR大于SSR100大于SSR50),干旱-连续型降雨模式下则由超渗向蓄满产流过渡(SSR100大于SR大于SSR50);分层径流水分来源整体呈现沿深度增加方向,事件水贡献比例降低、事件前水贡献比例升高的特征;SSR50作为径流分层的过渡层,其水分来源受下垫面条件影响显著,呈现“主导-均衡”的动态转换特征。
Taking the Nandadish Watershed as the research object,the watershed runoff was divided into surface runoff(SR),subsurface 0~50 cm runoff(SSR50),and subsurface 50~100 cm runoff(SSR100)based on hydrological and geomorphological characteristics.Through testing hydrogen and oxygen isotopes and hydrochemical indicators in various water bodies(precipitation,soil water,groundwater,layered runoff)during typical rainfall events,combined with high-resolution hydrometeorological monitoring data,the formation mechanisms of layered runoff under different underlying surface-meteorological conditions were analyzed.Hydrological tracing techniques coupled with end-member mixing models revealed the dynamic changes in contribution proportions of various water sources to layered runoff.Results show that layered runoff generation mechanisms and water sources differ significantly under various underlying surface-meteorological conditions.Under wet-multistage rainfall patterns,mixed runoff generation modes of infiltration-excess and saturation-excess predominate(runoff SR is higher than SSR100,which in turn is higher than SSR50).Under wet-short duration intense rainfall patterns,surface infiltration-excess runoff is dominant(runoff SR is higher than SSR100,which in turn is higher than SSR50).Under drought-continuous rainfall patterns,there is a transition from infiltration-excess to saturation-excess runoff(runoff SSR100 is higher than SR,which in turn is higher than SSR50).The water sources of layered runoff generally show a pattern where,with increasing depth,the contribution proportion of event water decreases while that of pre-event water increases.SSR50,serving as a transition layer for runoff stratification,has water sources significantly influenced by underlying surface conditions,exhibiting dynamic“dominant-balanced”conversion characteristics.
作者
马昱斐
马啸赞
陈璐
廖爱民
刘翠善
鞠琴
王国庆
Ma Yufei;Ma Xiaozan;Chen Lu;Liao Aimin;Liu Cuishan;Ju Qin;Wang Guoqing(The National Key Laboratory of Water Disaster Prevention,Nanjing Hydraulic Research Institute;Yangtze Institute for Conservation and Development,Hohai University;College of Hydrology and Water Resources,Hohai University;Cooperative Innovation Center for Water Safety and Hydro Science,Hohai University;School of Civil and Hydraulic Engineering,Huazhong University of Science and Technology)
出处
《水资源保护》
北大核心
2026年第1期232-242,共11页
Water Resources Protection
基金
“十四五”国家重点研发计划青年科学家项目(2023YFC3081000)
国家自然科学基金项目(52409036)
中央级公益性科研院所基本科研业务费专项资金项目(Y524006)
江苏省基础研究计划自然科学基金项目(BK20240283)。
关键词
氢氧同位素
分层径流
端元混合模型
径流分割
产流机理
南大洼流域
hydrogen and oxygen isotopes
layered runoff
end-member mixing analysis model
runoff segmentation
runoff generation mechanism
the Nandadish Watershed
