流域初始状态对环境同位素法划分流量的影响

doi:10.11988/ckyyb.20171356

长江科学院院报 ›› 2019, Vol. 36 ›› Issue (6): 20-25.DOI: 10.11988/ckyyb.20171356

流域初始状态对环境同位素法划分流量的影响

陈学秋^1,2, 瞿思敏^1,2, 张雄鹰³, 崔彦萍⁴, 陈红雨⁵, 徐时进⁵, 石朋^1,2, 王轶凡², 勾建峰²

1.河海大学水文水资源与水利工程国家重点实验室,南京 210098;
2.河海大学水文水资源学院,南京 210098;
3.湖北省宜昌市水文水资源勘测局,宜昌 443000;
4.江苏省水文水资源勘测局,南京 210029;
5.水利部淮河水利委员会水文局,安徽蚌埠 233000

收稿日期:2017-11-24 出版日期:2019-06-01 发布日期:2019-06-12
通讯作者: 瞿思敏(1977-),女,湖北监利人,教授,博士,博士生导师,研究方向为水文物理规律模拟及水文预报。E-mail:wanily@hhu.edu.cn
作者简介:陈学秋(1993-),女,江苏宿迁人,硕士研究生,研究方向为水文物理规律模拟及水文预报。E-mail:cxqhhu@163.com
基金资助:
国家重点研发计划项目(2016YFC0402703);国家自然科学基金项目(41371048,51479062);中央高校基础科研业务费项目(2017B10914);浙江省省属科研院所扶持专项(2018F10027)

Influence of Initial State of Watershed on Hydrograph Separation Using Stable Isotopes

CHEN Xue-qiu^1,2, QU Si-min^1,2, ZHANG Xiong-ying³, CUI Yan-ping⁴, CHEN Hong-yu⁵,
XU Shi-jin⁵, SHI Peng^1,2, WANG Yi-fan², GOU Jian-feng²

1.State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China;
2.College of Hydrology and Water Resources, Hohai University, Nanjing 210098, China;
3.Bureau of Hydrology and Water Resources Survey of Yichang City, Yichang 443000, China;
4.Jiangsu Provincial Bureau of Hydrology and Water Resources Survey, Nanjing 210029, China;
5.Hydrology Bureau of Huaihe River Commission of the Ministry of Water Resources, Bengbu 233000, China

Received:2017-11-24 Online:2019-06-01 Published:2019-06-12

摘要/Abstract

摘要： 在使用同位素示踪剂划分流量时,流域初始状态会对事件水和事件前水分割产生影响。为研究流域初始状态对环境同位素法划分流量的影响,以和睦桥流域2015—2016年间4场降雨事件为研究对象,根据稳定同位素含量(δ¹⁸O)确定其在流域出口断面径流的不同水源组成比例,着重分析流域不同初始流量和前期土壤含水量对流量过程线划分的影响。结果表明:流域出口径流总量中事件前水占优,洪峰流量以事件水为主;流域不同初始状态下同位素分割结果不同,表明该流域存在多种产流机制,流域初始流量与总径流系数及事件水贡献比例呈负相关;前期土壤含水量与事件水贡献比例的影响模式复杂多变,但在前期土壤含水量较高或前期降雨较多的情况下,总径流中事件水贡献比例将降低。

关键词: 稳定同位素, 流量过程线划分, 初始流量, 初始土壤含水量, 和睦桥流域

Abstract: The separation of storm hydrographs using stable isotope tracers provides a scientific basis for the study of runoff-formation mechanism and runoff calculation.Many research results show that there is a correlation between the initial watershed state and the event/pre-event water proportion. Hydrograph separations were conducted using stable isotope(δ¹⁸O) to analyze the proportion of event/pre-event water on four rainfall events during 2015-2016 in Hemuqiao watershed and especially the influence of antecedent streamflow and soil moisture. The results indicated that pre-event water dominated streamflow but the event water accounted for more in the peak; the difference in hydrograph separations implied that multiple runoff generation patterns existed in different initial system states. The runoff coefficient and the contribution of event water to streamflow were negatively correlated with antecedent streamflow. The relationship between the contribution of event water and antecedentsoil moisture was complicated and the percentage event water of streamflow would decrease in the condition of high antecedentsoil moisture or large antecedent 5-day rainfall

Key words: stable isotope, hydrograph separation, antecedent streamflow, initial soil moisture, Hemuqiao watershed

中图分类号:

P338

陈学秋, 瞿思敏, 张雄鹰, 崔彦萍, 陈红雨, 徐时进, 石朋, 王轶凡, 勾建峰. 流域初始状态对环境同位素法划分流量的影响[J]. 长江科学院院报, 2019, 36(6): 20-25.

CHEN Xue-qiu, QU Si-min, ZHANG Xiong-ying, CUI Yan-ping, CHEN Hong-yu,
XU Shi-jin, SHI Peng, WANG Yi-fan, GOU Jian-feng. Influence of Initial State of Watershed on Hydrograph Separation Using Stable Isotopes[J]. JOURNAL OF YANGTZE RIVER SCIENTIFIC RESEARCH INSTI, 2019, 36(6): 20-25.

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流域初始状态对环境同位素法划分流量的影响

Influence of Initial State of Watershed on Hydrograph Separation Using Stable Isotopes

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