降雨及径流对西丽水库水质的影响

Influences of Rainfall and Runoff on Water Quality of Xili Reservoir

通过对西丽水库降雨前、中、后水质以及雨水和地表径流的监测，研究降雨和径流对西丽水库水质的影响。结果表明，雨水和地表径流中均含有严重超标污染物；降雨时，水库各项污染指标全面上升，总体水质从Ⅱ～Ⅲ类恶化至Ⅳ～Ⅴ类，增加幅度最大的污染指标是总氮、含铁量和浊度；雨后0．5h，水库水体出现一定程度的自净作用，但含铁量在整个水库继续增加，其他部分指标在不同区域也在继续上升。

The influences of rainfall and runoff on water quality of Xili Reservoir in Shenhzen are studied preliminarily in this paper through observations of water quality, rainfall and runoff before, during and after rains in the reservoir. Results show that the concentrations of some contaminations in the rainfall and runoff are higher than water quality standard; all the pollution indexes of reservoir water rise during the rain, and the whole water quality is deteriorated from the level Ⅱ～Ⅲ to the level Ⅳ～Ⅴ, with the highest augment range of total nitrogen, iron and turbidity. Half an hour after the rain, self-purification effect appears to some extent, while the iron concentration increases continually; and other indexes are still rising at different areas.