陕西省渭河流域水质时空演化特性

研究陕西省渭河流域地表水质时程和流程,对陕西境内上下游2个主要控制断面的近20年水质指标时程演化特性进行了分析,对渭河干流13个控制断面9个监测指标的流程变化趋势进行了分析。经过分析表明:从时程上看,渭河流域水质呈严重恶化态势,各分析指标都不同程度随时间的推移而增加;从流程上看,渭河在进入陕西时水质状况较好,而在咸阳和西安地段污染状况十分严重,众多指标严重超标,水质量极差,受人类活动和流域水文过程的影响,渭河流域地表水污染严重,水质具有明显的时空演化特征,必须采取有效措施来遏制水环境质量的进一步恶化。

Temporal and spatial evolution characters of water quality in Weihe river basin in Shanxi Province

On the basis of monitoring data of water quality at main water quality monitoring stations in Shanxi Province in recent 20 years,the temporal and spatial evolution character of water quality was studied,and the variation trends of 9 indicators in 13 control sections in mainstreams of Weihe River were analyzed.Results show that the water quality of Weihe River gets worse as time goes by,but from the angle of flow rate,the water quality is better in the upstream and it is extremely bad and water pollution is severe in the section of Xi'an and Xianyang with many indices inferior to the water quality standard.Under impacts of human activities and hydrological process,water pollution in Weihe River Basin is severe and changes apparently with time and space.Efficient measures should be taken to suppress water quality deterioration.