Journal of Changjiang River Scientific Research Institute ›› 2025, Vol. 42 ›› Issue (1): 44-56.DOI: 10.11988/ckyyb.20230802

• Water Resources • Previous Articles     Next Articles

Influence of Wanfeng Lake Reservoir on Spatial and Temporal Distribution of Regional Precipitation

TONG Jin-shi1(), ZHOU Xiang-yang1,2(), REN Dong-xing3, ZHAO Shan-shan1   

  1. 1 College of Resources and Environmental Engineering, Guizhou University, Guiyang 550000, China
    2 Key Laboratory of Karst Geological Resources and Environment of Ministry of Education, Guizhou University,Guiyang 550000, China
    3 Chengdu Survey and Research Institute of MCC, Chengdu 610023, China
  • Received:2023-07-24 Revised:2023-10-20 Published:2025-01-01 Online:2025-01-01
  • Contact: ZHOU Xiang-yang

Abstract:

The construction of large reservoirs alters the spatial and temporal distribution of regional precipitation. This study focuses on the impact of the construction of Wanfeng Lake, a large reservoir situated in karst region, by analyzing the annual and seasonal variations of regional average precipitation before and after the reservoir’s construction using high-resolution precipitation data. We compared the spatial distribution patterns of precipitation before and after the reservoir construction and examined how factors such as flux and path direction of water vapor transport, reservoir construction, and topographic characteristics influence precipitation. The results indicate that the construction of Wanfeng Lake significantly changes the spatial distribution of local precipitation, with seasonal variations in precipitation amounts: decreases in summer and autumn, and increases in spring and winter. The Random Forest Feature Importance analysis identifies the flux and path direction of water vapor transport as the primary factors influencing regional precipitation. Moreover, the relative distance to reservoir plays a slightly more significant role after construction, suggesting an increased contribution of water vapor from the reservoir. These findings offer important insights for sustainable water resource management and flood/drought disaster prevention in reservoir regions.

Key words: large reservoir, regional precipitation, spatial and temporal variation, influence mechanism, Wanfeng Lake

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