东平湖地区地下水化学特征及质量评价

为分析东平湖周边地区地下水化学特征及地下水质量，运用离子分析、数理统计、Piper三线图及Gibbs图等方法，对研究区枯水期及丰水期溶解性总固体（TDS）时空分布、离子特征、水化学类型、影响因素和离子来源进行了分析；采用综合评价法对地下水水质进行了评价，并对其时空分布及水质成因进行了简析。结果表明：东平湖周边地区地下水TDS值普遍偏高，枯水期与丰水期空间分布规律差异不大；地下水中阳离子以Ca2+、Na+为主，阴离子以HCO3-、SO42-为主，水化学类型枯水期以HCO3?SO4-Ca?Na型水为主，丰水期以HCO3 -Ca?Na型水为主；枯水期地下水化学特征主要受岩石风化作用影响，部分受蒸发浓缩作用影响，离子主要来源为蒸发岩溶解及碳酸盐溶解的共同作用，丰水期主要受岩石风化作用影响，离子主要来源为碳酸盐溶解；研究区地下水水质相对较差，枯水期与丰水期水样中Ⅳ类水（较差）及Ⅴ类水（极差）占比均超过了50％，但丰水期Ⅱ（良好）、Ⅲ（较好）类水比枯水期同类水分布区域更广。

Chemical characteristics and quality evaluation of groundwater in Dongping Lake Area

In order to analyze the groundwater chemical characteristics and the groundwater quality in the surrounding area of Dongping Lake, using methods such as ion analysis, statistics method, piper trilinear diagram and Gibbs diagram, the spatial and temporal distribution of Total Dissolved Solid(TDS), ion characteristics, hydrochemistry type, influencing factor and ion source during dry and wet periods in the area studies were analyzed. Using comprehensive evaluation method, the groundwater quality was evaluated, and its spatial and temporal distribution and the causes of water quality were analyzed. The results show that the TDS value of groundwater in the surrounding areas of Dongping Lake is generally high, and there is slight difference in the spatial distribution of dry and wet periods; groundwater cations are mainly Ca2+ and Na+, anions are mainly HCO3- and SO42-, and the main hydrochemical type is HCO3?SO4-Ca?Na type water of dry season, and HCO3-Ca?Na type water is the main type of wet period. The chemical characteristics of groundwater of dry season are mainly affected by the rock weathering and partly by the evaporating concentration, and the main source of ions is the combined action of evaporite dissolution and carbonate dissolution. The wet period is mainly affected by rock weathering, and the main source of ions is carbonate dissolution; the groundwater quality in the area studies is relatively poor, and the water samples in the dry period and the wet period are Grade IV (Poor) and Category V (very poor) water accounted for more than 50%, but the distribution area of category II (good) water and III (good) water in high water period is wider than that of similar water in low water period.