和睦桥流域同位素示踪剂划分事件水的试验研究

发布时间：2018-10-15 18:30

【摘要】：流量过程线的划分结果对流域滞时分析、降雨径流关系确定和坡地汇流计算影响很大。以和睦桥小流域为例,基于该区域2015~2016年4场降雨资料,运用同位素方法对流域的流量过程线进行划分,探究降水总量和平均雨强对事件水贡献比例的影响。结果表明,事件前水占总流量的百分比例很大(67.9%~98.3%),肯定了事件前水的重要性;总降水量和降雨强度与事件前水占总流量的百分比例均呈负相关,这主要与流域所处地理位置的气候条件和下垫面前期土壤含水量有关;不同雨型主要通过降雨事件过程中的蒸发作用来影响事件前水的贡献比例,而相同雨型的降雨事件可能与前期土壤含水量有关。
[Abstract]:The result of the flow process line has great influence on the analysis of time lag, the determination of the relationship between rainfall and runoff and the calculation of runoff concentration on slope land. Based on the data of 4 rainfall events from 2015 to 2016, the flow process line of the watershed is divided by isotope method, and the influence of total precipitation and average rain intensity on the ratio of event water contribution is explored. The results show that the percentage of water in the total discharge before the event is very large (67.9% or 98.3%), which confirms the importance of the water before the event, and the total precipitation and rainfall intensity are negatively correlated with the percentage of water in the total discharge before the event. This is mainly related to the climatic conditions of the geographical location of the basin and the soil moisture content in the pre-cushion period, and different rain patterns mainly affect the contribution ratio of pre-event water through evaporation during rainfall events. The rainfall event of the same rain pattern may be related to the soil moisture content in the earlier period.
【作者单位】：河海大学水文水资源与水利工程科学国家重点实验室;河海大学水文水资源学院;
【基金】：国家自然科学基金项目(41371048,51479062,40901015) 国家重点研发计划(2016YFC402703)
【分类号】：P333

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