Characterizing the properties of daily precipitation concentration in Amur River Basin of northeast China

¹ State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, Beijing, 100048, China
² China Institute of Water Resources and Hydropower Research, Beijing, 100048, China
³ International Research and Training Center on Erosion and Sedimentation, Beijing, 100048, China
⁴ College of Soil and Water Conservation, Beijing Forestry University, Beijing, 100083, China

^* Corresponding author: wangyousheng119@163.com

Abstract

The Amur River Basin is one of the most sensitive areas to the effects of climate change. In this study, spatial and temporal analysis of concentration index over the Amur River Basin in northeast China was presented. Precipitation data from 71 meteorological stations for the time series 1980-2018 on daily scale was employed in the study. The results indicated that precipitation events of low-intensity accounted for 28.59 % of rainy days, however, the proportion of rain amount was 1.33 %. On the contrary, high-and very high-intensity events accounted for 40.34 % of rainy days and as high as 90.53 % of annual precipitation amount. Precipitation concentration explain the cause of why some regions are prone to be influenced by high intensity precipitation events, spatial distribution of different intensities can be partly interpreted by daily rainfall heterogeneity and regional geomorphology. Furthermore, a significant change toward a stronger precipitation concentration was demonstrated over some regions, and this need concern from the administration.