降水同位素时程变化对流量过程线划分的影响  

The Influence of Temporal Variability in Isotopic Composition of Precipitation on Hydrograph Separation

作　　者：陈浩 瞿思敏[1,2] 石朋[1,2] 尚艳丽[3] 勾建峰 张旭旻 CHEN Hao;QU Si-min;SHI Peng;SHANG Yan-li;GOU Jian-feng;ZHANG Xu-min(College of Hydrology and Water Resources,Hohai University,Nanjing 210098,China;The Experimental Teaching Center of Water Conservancy Projects,Hohai University,Nanjing 210098,China;Hydrological Bureau of Taiwan City,Taiwan 271000,China)

机构地区：[1]河海大学水文水资源学院,江苏南京210098 [2]河海大学水利工程实验教学中心,江苏南京210098 [3]泰安市水文局,山东泰安271000

出　　处：《水电能源科学》2021年第4期27-30,共4页Water Resources and Power

基　　金：国家重点研发计划(2019YFC0409000,2016YFC0402703);国家自然科学基金项目(41371048);中央高校基本科研业务费专项资金项目(2017B10914)。

摘　　要：流量过程作为流域降水的响应,综合反映了流域水源概况和降水强度等特征,对其科学划分有助于深入研究流域的降雨径流关系、产汇流机制和水文模型的构建。采用二水源划分方法分割和睦桥小流域2016年两场降水事件的流量过程线,对比分析考虑降水同位素时程变化前后的划分结果。研究表明,降水、河水和地表水的同位素特征均随时间推移产生波动,但河水和地表水的波动远远小于降水的波动。此外,忽略时程变化将高估洪峰时刻事件前水对流域总出流量的贡献,而在退水阶段则低估了事件前水的贡献。这说明降水稳定同位素的时程变化深刻影响着流量过程线划分的结果,忽视这种变化不可取。The flow process,as a response to the precipitation,is a comprehensive representation of water source,precipitation patterns and rainfall intensity in a basin.It is helpful to explore the relationship between precipitation and runoff,the rainfall-runoff characteristics and the construction of hydrological model.In this paper,the hydrograph separation of two precipitation events in 2016 in Hemuqiao watershed were constructed by the two-water source division method.The results of the division before and after the temporal variability of precipitation were comparative analysis.Our research finds that all precipitation,river water and surface water,their isotopic signatures fluctuate over time,but this fluctuation in river and surface water is much smaller than precipitation.In addition,the contribution of pre-event water to the total flow is overestimated at the flood peak and underestimated in the dewatering stage without considering the temporal variability.This indicates that the temporal variability of precipitation stable isotopes has a influence on the result of hydrograph separation.It is unwise to ignore this variability.

关 键 词：时程变化 流量过程线 稳定同位素 事件前水 

分 类 号：TV211.11[水利工程—水文学及水资源]