Analysis and evaluation of water resources in the Hanjiang River basin

Xiong Ming; Xu Changjiang; Li Wei; Bu Hui

doi:10.3969/j.issn.1000-1123.2024.23.007

Abstract：As the water source region for the Middle Route of the South-to-North Water Diversion Project,the Han-to-Wei Water Diversion Project,and the water resource allocation project in northern Hubei,the Hanjiang River is critical to supporting China's coordinated economic and social development.In recent years,intensified impacts of climate change and human activities have exacerbated the conflict between water supply and demand in the basin,highlighting the necessity for a systematic analysis of its water resources'spatiotemporal distribution characteristics.Based on precipitation and surface water resource data(1956-2016)and groundwater resource data(2001-2016),this study analyzes the spatial distribution and interannual variation trends of precipitation,surface water resources,and groundwater resources in the Hanjiang River basin.The results indicate:(1)The long-term average annual precipitation in the Hanjiang River basin(1956-2016)is 897.7 mm,with annual evaporation ranging from 700 to 1100 mm.(2)The long-term average annual runoff depth ranges from 200 to 900 mm,with runoff during the maximum four consecutive months accounting for 55%～72%of total annual runoff,mostly occurring from July to October.(3)Groundwater resources are relatively abundant in mountainous areas,with their proportion being higher in mountainous regions compared to plains.(4)The long-term average annual total water resources in the basin are 56.40 billion m3,distributed across six provincial-level administrative regions:Shaanxi(25.13 billion m3),Hubei(22.01 billion m3),Henan(6.946 billion m3),Sichuan(0.385 billion m3),Chongqing(1.883 billion m3),and Gansu(0.045 billion m3).