Spatial and temporal variation of precipitation characteristics in the semiarid region of Xi'an, northwest China

Author:

Han Hao1,Hou Jingming1,Jiang Rengui1,Gong Jiahui1,Bai Ganggang1,Kang Yongde1,Qi Wenchao2,Li Yuan3,Li Bingyao1

Affiliation:

1. State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China, Xi'an University of Technology, NO. 5 Jinhua Road, Xi'an 710048, Shaanxi, China

2. State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, NO. 92 Weijin Road, Tianjin, 300072, China

3. School of IM, Shaanxi Institute of Technology, NO.8 Renmin Road, Xi'an, 710300, Shaanxi, China

Abstract

Abstract Precipitation variations mostly affect the water resource planning in semi-arid regions of northwest China. The objective of this study is to quantitatively explore the spatial and temporal variations of precipitation in different time scales in Xi'an city area. The Mann–Kendall test and wavelet analysis methods were applied to analyze the precipitation variability. In terms of temporal variation of precipitation, the results indicated that the annual precipitation exhibited a significant decreasing trend during 1951–2018. Except for summer precipitation representing a slightly increasing trend, the other seasonal precipitations had a similar decreasing trend to annual precipitation throughout 1951–2018. The monthly precipitation had different change trends, showing the precipitation from June to September could account for 58.4% of the total annual precipitation. In addition, it was clear that annual precipitation had a significant periodic change, with the periods of 6, 13, 19, and 27 years. For the spatial variation of precipitation during 1961–2018, the results showed that annual and seasonal precipitation exhibited obvious spatial differences, indicating an increasing spatial trend from north to south. Thus, understanding the precipitation variation in Xi'an city can provide a theoretical foundation of future water resources management for other cities in semi-arid regions of northwest China.

Funder

National Natural Science Foundation of China

Beijing Key Laboratory of Electromechanical System Measurement and Control

Publisher

IWA Publishing

Subject

Management, Monitoring, Policy and Law,Atmospheric Science,Water Science and Technology,Global and Planetary Change

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