甘肃省河西走廊水质现状分析

Status Analysis of Water Quality of Hexi Corridor in Gansu

本文以水质分析资料和动态观测资料为基础,依照我国现行水质标准,对河西走廊地表水、地下水水质现状进行综合分析。结果表明,河西走廊内陆河流域地表水水质现状为:在被监测的河流断面中水质符合Ⅲ类标准的断面占监测断面河长总数的82．61％,不符合Ⅲ类水质标准的断面占被监测断面河长总数的17．38％:地下水水质地下水受污染面积约300Km^2,受污染的趋势仍在加重,多发生在主要城市、工矿企业区及其周边地区。从区域水环境看,水污染以点状、线状向片状发展。目前,不可直接利用的地表水、地下水多分布于该区内陆盆地中心地带及河流下游。

According to our national current water quality standard,the paper comprehensively analyses surface water and groundwater status of Hexi Corridor based on water quality analysis and dynamic observing data.The result shows:the surface water quality status of inland river basin in Hexi Corridor is:the section which water quality met withⅢstandard accounts for 82.61% of tatal river length in surveyed river sections,the section which water quality didn't meet withⅢstandard accounts for 17.38%.Groundwater quality polluted area is about 300Km^2,and the pollution tendency becomes worse.It always arises in main cities,industrial and mining enterprises zones as well as surroundings.Water pollution develops from point and line to surface in regional water environment.At present,the surface water,groundwater which undirectly utilized distributed in center area of inland basin and lower reaches.