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。
The result of hydrograph separation is important to the basin lag time analysis,the relationship between rainfall and runoff and the calculation of mean transit time of slope.Based on the four rainstorms' stable isotope data collected during 2015-2016 in Hemuqiao Watershed,isotope hydrograph separation analysis was used to study the relationship between the storm size and the average storm intensity to the event water.The results show that the percentage of pre-event water is very large(67.9%~98.3%),and the importance of pre-event water is confirmed.We found that there are negative correlations between storm size and percent pre-event water,and the average storm intensity is negatively correlated with the percentage of the pre-event,which is mainly related to the climatic of the basin and antecedent moisture.Different types of rain mainly affect the contribution of pre-event water through the evaporation in the process of rainfall.The same types of rainfall were mainly related to the antecedent moisture.
出处
《水电能源科学》
北大核心
2017年第10期29-32,共4页
Water Resources and Power
基金
国家自然科学基金项目(41371048
51479062
40901015)
国家重点研发计划(2016YFC402703)
关键词
氢氧同位素
流量过程线分割
降雨总量
雨强
事件前水
hydrogen and oxygen isotope
discharge hydrograph separation
rainstorm size
rainfall intensity
pre-event water
