汉江中下游水质现状及污染趋势分析

通过对1992,1998,2000,2003年汉江4次暴发严重"水华"事件的成因分析,表明汉江中下游频发"水华"的最根本、最直接原因是水体中N,P等营养物含量偏高,是水质恶化与水流、气象等因素共同作用的结果。在对近20年汉江中下游水质监测资料的统计分析基础上,研究了汉江中下游水质污染的现状、特点及变化发展趋势,并对南水北调中线工程实施调水后可能对汉江中下游水环境的影响进行了预测,提出了保护汉江中下游水环境、促进水资源可持续利用的对策措施。

Current situation of water quality of the middle and Lower Hanjiang River and trend of its Pollution

An analysis of the causes of and hydrodynamic condition for algae blooms breaking out in 1992, 1998, 2000, and 2003 in the Hanjiang River shows that the algae blooms are mainly caused by high contents of nitrogen and phosphorus and some other factors, such as the deterioration of water quality, water flow and meteorological characteristics. Based on the statistical analysis of water quality data of the middle and lower Hanjiang River in the recent 20 years, the current situation, characteristics, and trend of water pollution in these regions are studied, and the influence of the South-to-North Water Transfer Project on the water environment of the middle and lower Hanjiang River is predicted. Finally, some measures for protection of water environment and promotion of the sustainable utilization of water resources are put forward.