干旱对流域地表水体水质影响初探

Preliminary Study on Effects of Drought Events on the Quality of Surface Water in a Basin

干旱缺水导致的水环境污染问题主要表现为污染物浓度升高、水体富营养化加剧、河流水域纳污能力降低。通过识别干旱对流域水环境的影响机制,系统介绍了干旱发生时和干旱发生后产生降水对流域地表水体水质的影响,着重研究了旱涝交替阶段污染物产生、入河及在河道中的迁移转化规律。结果表明:干旱导致流域水体污染不断恶化,区域生态平衡受到严重影响;干旱导致可用水资源量减少、水质污染加剧、严重影响社会经济的发展和人类健康,其中水质恶化表现最为突出。

Water pollution problems caused by increased drought and water shortage, mainly indicates that pollutant concentration increases eu- trophication and river water pollutant carrying capacity declines. Through the identification of drought on river basin water environment influence mechanism, it introduced systematically drought and drought occurred after the impact of precipitation on the surface water quality of the basin, fo- cusing on the migration of contaminants generated alternating droughts and floods stage, into the river and in the river transformation law. The re- sults show that the drought causes water pollution worsening and regional ecological balance is seriously affected; the drought causes the amount of available water resources reducing, aggravation of water pollution and serious impact on the development of social economy and human health, in- cluding water quality deterioration in the performance of the most prominent.