Water Science and Engineering 2015, 8(1) 30-39 DOI:   10.1016/j.wse.2014.11.001  ISSN: 1674-2370 CN: 32-1785/TV

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water quality
single factor evaluation method
Mann-Kendall test
numerical modeling
cluster analysis
Dangjiangkou Reservoir
Xiao-kang XIN
Ke-feng LI
Article by Xiao-kang XIN
Article by Ke-feng LI
Article by Brian FINLAYSON
Article by Wei YIN

Evaluation, prediction, and protection of water quality in Danjiangkou Reservoir, China

Xiao-kang XIN*1, 2, Ke-feng LI1, Brian FINLAYSON3, Wei YIN2

1. State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, P. R. China
2. Changjiang Water Resources Protection Institute, Changjiang Water Resources Commission, Wuhan 430051, P. R. China
3. Department of Resource Management and Geography, the University of Melbourne, Victoria 3010, Australia


The water quality in the Danjiangkou Reservoir has attracted considerable attention from the Chinese public and government since the announcement of the Middle Route of the South to North Water Diversion Project (SNWDP), which commenced transferring water in 2014. Integrated research on the evaluation, prediction, and protection of water quality in the Danjiangkou Reservoir was carried out in this study in order to improve environmental management. Based on 120 water samples, wherein 17 water quality indices were measured at 20 monitoring sites, a single factor evaluation method was used to evaluate the current status of water quality. The results show that the main indices influencing the water quality in the Danjiangkou Reservoir are total phosphorus (TP), permanganate index (CODMn), dissolved oxygen (DO), and five-day biochemical oxygen demand (BOD5), and the concentrations of TP, BOD5, ammonia nitrogen (NH3-N), CODMn, DO, and anionic surfactant (Surfa) do not reach the specified standard levels in the tributaries. Seasonal Mann-Kendall tests indicated that the CODMn concentration shows a highly significant increasing trend, and the TP concentration shows a significant increasing trend in the Danjiangkou Reservoir. The distribution of the main water quality indices in the Danjiangkou Reservoir was predicted using a two-dimensional water quality numerical model, and showed that the sphere of influence from the tributaries can spread across half of the Han Reservoir if the pollutants are not controlled. Cluster analysis (CA) results suggest that the Shending River is heavily polluted, that the Jianghe, Sihe, and Jianhe rivers are moderately polluted, and that they should be the focus of environmental remediation.

Keywords water quality   single factor evaluation method   Mann-Kendall test   numerical modeling   cluster analysis   Dangjiangkou Reservoir  
Received 2014-07-13 Revised 2014-11-24 Online: 2015-01-31 
DOI: 10.1016/j.wse.2014.11.001

This work was supported by the National Natural Science Foundation of China (Grants No. 41101250 and 51309031) and the Chinese 12th Five-Year Science and Technology Support Program (Grant No. 2012BAC06B00).

Corresponding Authors: Xiao-kang XIN
Email: xin.xiaokang@163.com
About author:


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