Abstract
According to the daily flow data collected by three representative hydrological stations in the Xiangjiang River basin which are the Guiyang station in the upstream section, the Hengshan station in the midstream section, and the Xiangtan station in the downstream section, and the water environment data collected from the Hunan Water Resources Bulletin, Mann-Kendal method was used to analyze the changes of the annual average flow of the Xiangjiang River basin in the past 20 years as well as the variation of water environment quality in the whole year, flood season and non-flood season. Based on these analysis, the evolution trend of water resources and water environment in the Xiangjiang River basin is further forecasted. The results show that the annual runoff of the upper reaches of the Xiangjiang River basin tends to be stable, and the runoff of the middle and lower reaches is decreasing. The water quality of the Xiangjiang River basin got deteriorated from 1996 to 2010. A sudden change occurred around 2012, and the water quality of the basin gradually improved.
Highlights
The evolution trend of water resources in the Xiangjiang River basin is analyzed by analyzing the interannual variation of annual runoff in the Xiangjiang River basin
The results show that the annual runoff of the upper reaches of the Xiangjiang River basin tends to be stable and the scope of change is small
The water quality of the Xiangjiang River basin has been deteriorating throughout the 14-year period from 1996 to 2010, and the water quality is poor
Summary
Which are injected into Dongting Lake at Haohe River located in Yiyang. The water system in the basin is very complicated, which has numerous tributaries. The two sides of the main stream of the Xiangjiang River are in the form of asymmetrical feathers. The right bank covers an area of 67,316 km, accounting for 71.2% of the total area of the basin, where the three major tributaries are Xiaoshui river, Leishui river and Mishui river located on the right bank, with watersheds exceeding 10,000km. The left bank covers an area of 27,433 km, accounting for 28.8% of the total area of the basin, where the seven major tributaries with a drainage area of more than 1000 km are distributed on the left bank, with the largest catchment area is 7155km2.(Fig.1)
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