贵州六冲河流域地下水资源特征与评价

Characteristics and Evaluation of Groundwater Resources in Liuchong River Basin of Guizhou

介绍了六冲河流域概况和地下水资源分布特征,采用降水入渗系数法、径流模数法和枯季径流模数法计算了各个分区的地下水天然补给量、排泄量和可采资源量,并对水质进行了评价。结果表明,有41个水样中NO3-超出地下水质量2类标准,与采样点附近的洼地和坡地区农业生产的排放有直接关系;29个水样中Cr(六价)含量超出地下水质量2类标准,11个水样中Mn含量超出地下水质量2类标准,污染源主要来自取样点上游城镇工厂排污、煤矿矿坑排水;P2l含煤系地层中地下水超出2类标准的指标数目相对较多,尤其是重金属含量;除直接取自煤矿排水的水样以外,其余地下水均符合地下水质量3类标准。

The general situations of Liuchong River Basin and the distribution characteristics of groundwater resources were introduced.Using precipitation infiltration coefficient method,runoff modulus method and dry-season runoff modulus method,the natural recharge amount,discharge amount and recoverable amount of groundwater in each subarea were calculated.And the water quality was evaluated.The results showed that NO3-in 41 water samples exceeded the second standard of groundwater quality,which had a direct relation with the discharge of agricultural production in depression and slope land around the sampling sites.Cr6＋ content in 29 water samples exceeded the second standard of groundwater quality.Mn content in 11 water samples exceeded the second standard of groundwater quality.The main pollution sources were the dredging from the factories of the upstream towns and the coal mine drainage.Many indices of groundwater in P2l coal-bearing stratum exceeded the second standards of groundwater quality,especially heavy metal content.Except the water samples directly from coal mine drainage,other groundwater accorded with the third standards of groundwater quality.