Arid Zone Research ›› 2023, Vol. 40 ›› Issue (10): 1583-1594.doi: 10.13866/j.azr.2023.10.05

• Weather and Climate • Previous Articles     Next Articles

Characteristics of precipitation changes in the Shule River Basin

JI Zonghu(),SUN Dongyuan(),NIU Zuirong,WANG Xingfan,WU Lanzhen,MA Yali,CHEN Caiping,CUI Yanqiang   

  1. College of Water Conservancy and Hydropower Engineering, Gansu Agricultural University, Lanzhou 730070, Gansu, China
  • Received:2023-03-27 Revised:2023-06-09 Online:2023-10-15 Published:2023-11-01

Abstract:

The annual and monthly precipitation data from five hydrological stations in the Shule River Basin from 1956 to 2020, were analyzed using linear tendency, sliding average, cumulative anomaly, Mann-Kendall mutation test, wavelet analysis, and other methods. The interannual variation process for precipitation in the Shule River Basin and its variation characteristics, such as mutability, trend, periodicity, persistence, heterogeneity, and concentration, were evaluated. The results show that the annual precipitation at each station in the Shule River Basin showed different increasing trends, and the precipitation at each station showed different mutation characteristics. Over the previous 60 years, precipitation in the entire basin presents a relatively uneven distribution on the time scale, and the precipitation in the upstream area is more than that in the downstream. Specifically, the annual precipitation at Changmabao and Dangchengwan stations showed obvious increasing trends, while the increasing trend at Panjiazhuang station and Shuangtabao and Danghe reservoir stations was not obvious. The analysis indicates that precipitation in the basin will continue to show an increasing trend in the coming period.

Key words: Shule River, precipitation, Mann-Kendall test, trendiness, periodicity, R/S analysis method