Dr. Shahram khalighi Sigaroodi——遥感科学国家重点实验室2018年系列学术讲座之二十三

　　报告题目：How can we consider the storm direction in case of lack of gauge inside the basin?

　　报告人：Dr. Shahram khalighi Sigaroodi (University of Tehran, Iran)

　　邀请人：曹春香 研究员

　　时间：2018年9月7日上午9:00  

　　地点：中科院遥感地球所（奥运园区）B202          

　　报告人简介：

　　Shahram Khalighi Sigaroodi obtained his PhD in field of hydrology in 2004 from University of Tehran while simultaneously has worked as lecturer in natural resources faculty. He has taught several courses such as Climatology, Hydrology, Hydraulic, Hydrological modeling, urban hydrology, Rainfall- runoff modeling for the B.Sc., M.Sc. and PhD students and he has been supervisor and advisor of more than 40 M.Sc. and PhD students. He has published 35 SCI Papers and already he is reviewer of five scientific journals. He is associate professor in university of Tehran since 2014; and is head of department of arid and mountainous regions reclamation.

　　报告摘要:

　　A number of studies have emphasized the effects of rainfall movement on runoff simulation but due to the lack of rain gauges inside area of the many of the small basins, the nearest gauges data is used as the basin hyetograph. To simplify the model in most of the studies, it is assumed that the storm arrives over the watershed area quickly and stays there stationary. This assumption cause temporal difference between observed and simulated hydrographs, which may be covered by other temporal parameters such as time of concentration, and lag time. This study investigated the effects of neglecting rainfall movement on overland simulation results in even a middle-sized basin. Simulations were carried out under two conditions: 1) Stationary conditions where the nearest gauge hyetograph was used and rainfall movement was ignored, (which is quite common in the case of a lack of data), 2) Moving conditions where a shifted hyetograph based on hyetograph timing recorded in the basin was used. The simulation results were compared with the measured discharge at the outlets. The results revealed that using the shifted hyetograph, which could consider the rainfall movement over sub-basins, decreased the mismatches between the simulated and observed hydrograph. In some of the cases, the shifted hyetograph reduced the relative difference more than 20？percent. The study provided a useful method to cope with rainfall movement in runoff modelling of sparsely gauged large watersheds.