Abstract
On the background of analysis on region water environment safety in the Dongjiang Lake of south-central China, the source of pollution of water environment and its control are studied. The concept of region environment disaster chain is put forward on the basis of combination study on the disaster chain theory and pollution problem in regional water environment. Through identification and analysis of pollution disaster resources in regional water environment of the Dongjiang Lake, the annual emission of the chemical oxygen demand (COD), ammonia nitrogen, total phosphorus (TP) and heavy metal (Cd, As, Pb) are counted. According to evaluation on structure proportion of contaminants in the Dongjiang Lake, agricultural non-point source is the uppermost pollution source, which accounted for 87.74% in total pollution load. Ammonia nitrogen, TP and COD are mainly contaminants accounted for 94.27% in total pollution load. By analyzing danger of contaminants in the lake, basic form of disaster chain of water environment pollution is built elementarily. It shows characteristics of branches and trunk basin disaster chain and embodies multisource disaster implication chain caused by human activities. Then, disaster resources chain-cutting methods for pollution prevention and control of regional water environment of the Dongjiang Lake are analyzed.
Highlights
The Dongjiang Lake is located in Hunan Province of China, and on the juncture of Guangdong and Jiangxi provinces (Figure 1)
This shows that the main pollution source in the Dongjiang Lake is agricultural non-point source, which account for 87.74%, and the main pollutants were ammonia nitrogen, total phosphorus (TP), chemical oxygen demand (COD), whose equivalent pollution load represent 94.27% of the total load
This paper developed the research of disaster chain to regional water environment security research, and discussed the connotation of regional environment disaster chain
Summary
The Dongjiang Lake is located in Hunan Province of China, and on the juncture of Guangdong and Jiangxi provinces (Figure 1). It is a large reservoir in upstream of the Leishui River, the primary tributary of the Xiangjiang River, with the water surface area of 160 km and a total capacity of 9.74 billion m3, which is known as the “Dongting of Southern Hunan”. The Dongjiang Lake water resources protection has important meaning to guarantee water security on the influenced region, and it is a major demand of national sustainable development of advanced demonstration area construction for Zixing, which is one of county-level cities of Chenzhou by the lake. Focused on the environment security issues of the Dongjiang Lake, this paper analyzed the pollution situation and prevention issues of regional water environment in the Dongjiang Lake at first, and discussed the manifestation and treatment measures of multi-source regional environment disaster chain in ore district of the lake from the perspective of disaster chain, providing technical supports to protect the water resources of the lake and its ecosystem
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