沋河流域下游水化学特征及影响因素分析

为研究城市水质特征及影响因素,监测并治理城市景观用水,在沋河流域下游（沋河公园、渭南老街）测定城市水景中的主要化学离子,运用统计学方法,并通过Gibbs图和Piper三线图,分析该地区地表水的水化学特征以及成因。研究河段总离子浓度自沋河水库往下呈波状变化,主要来自可溶性岩石的岩溶和风化产物的Na+ 和Ca2+较多,NH4+和K+变异系数较大,说明受人类活动影响大;农村污水排放区地表水接受两河流岸高电导率（EC）和Cl-浓度的地下水补给,该区域总离子浓度最高,水污染严重;研究河段Na+ 、SO42－、Cl－、NO2-呈正相关性,城区污水中的可溶性钠盐是主要污染源。研究区水质治理应重视农村及城市污水排放的管理和治理,着重关注钠盐污染问题。

Hydrochemical Characteristics and Their Influencing Factors in the Lower Reaches of Youhe River Basin

To study the characteristics of urban water quality and its influencing factors, monitor and management of urban landscape water, measured the main chemical ions in the lower reaches of the Youhe River Basin, analyzed the water chemistry and genesis in study area by Gibbs diagram and Piper diagram.The total ion concentration in the study section was wavy from the Youhe Reservoir. More Na+ and Ca2+ mainly from the karst and weathering products of soluble rocks were found. NH4+ and K+ coefficients of variation were larger, suggesting which were affected by human activities. Surface water in the rural sewage discharge area was supplied by groundwater with high conductivity(EC) and high Cl- mass concentration values, the total ion concentration in the area showed high value, suggesting serious water pollution. Positive correlation were found between Na+, SO42-, Cl-, NO2- that soluble sodium in urban sewage was the main source of pollution.Water quality control in the study area should pay more attention to the management and treatment of rural sewage, pay special attention to the problem of sodium and salt pollution caused by sewage.