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[1]ZHANG Haining,ZHOU Qi,MAO Yuwei,et al.Analysis of Extreme Precipitation Characteristics in Weihe River Basin[J].Research of Soil and Water Conservation,2022,29(03):128-134.

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Analysis of Extreme Precipitation Characteristics in Weihe River Basin

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 29 Number of periods: 2022 03 Page number: 128-134 Column: Public date: 2022-04-20

Title:: Analysis of Extreme Precipitation Characteristics in Weihe River Basin

Author(s):: ZHANG Haining, ZHOU Qi, MAO Yuwei, MA Yuansen, DING Pengcheng, WEN Yanjun; (Shaanxi Key Laboratory of Disaster Monitoring and Mechanism Simulation, Baoji University of Arts and Sciences, Baoji, Shaanxi 721013, China)

Keywords:: Weihe River Basin; extreme precipitation; spatiotemporal characteristics; percentile method

CLC:: K903

DOI:: -

Abstract:: To study the characteristics of extreme precipitation and frequency of extreme precipitation events in Weihe River Basin, based on the daily precipitation data of 41 meteorological offices and stations and historical flood data of Weihe River Basin in the period 1961—2016, the extreme precipitation(R95P), extreme precipitation frequency(RD95), extreme precipitation intensity ratio(RI95)and extreme precipitation features(RC95)four extreme precipitation index were selected, spatial and temporal variation characteristics of each index and different frequency of extreme precipitation events sub basin were analyzed by using the linear trend method, correlation analysis, Mann-Kendall mutation test, ordinary kriging interpolation method. The results show that:(1)the threshold of extreme precipitation in the Weihe River Basin was between 16.40 mm and 26.29 mm, and the threshold of extreme precipitation in more than 17% of meteorological stations in the basin was more than 25 mm;(2)the spatial distribution of R95P was between 127.81 mm and 201.41 mm, and it decreased with the increase of latitude; RD95 main stream and Jinghe River Basin were higher; RI95 ranged from 24.37 to 39.81 mm/d, and had a good correlation with the spatial distribution of R95P. It was higher in the east and downstream of the main stream;(3)in terms of inter-annual variation, R95P and RD95 showed no significant change, while RI95 and RC95 showed a slight increase trend, and increased significantly after 2000;(4)several major floods in the Weihe River Basin were accompanied by extreme precipitation; the frequency of extreme precipitation events in the lower reaches of the Weihe River Basin was the highest, mainly occurred in the early 1980s and the early 21st century. In conclusion, the region with higher extreme precipitation in the Weihe River Basin has higher extreme precipitation intensity. In the future, the superposition effect of multi-regional extreme precipitation on the mainstream and downstream river should be considered to reduce disaster risk.

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Last Update: 2022-04-20