海南省琼中县地下水质量评价研究

Evaluation of Groundwater Quality in Qiongzhong County of Hainan Province

海南省琼中县分布有二叠纪、三叠纪、侏罗纪、白垩纪等期次的侵入岩,岩性以花岗岩、花岗闪长岩为主,约占县域面积的86%;它们的地质构造相对不发育,地下水富水性差异大,地下水质量状况不详。为了查明琼中县地下水质量现状,共采集地下水样品136组,确定参评指标56项,采用单因子评价法和综合质量评价法对采集到的地下水样品质量进行评价。评价结果显示:琼中县地下水质量总体较好,I~III类地下水分布面积2156.47 km^(2),占县域总面积的80%;影响地下水质量的天然化学组分主要是铁、锰、铝、硝酸盐、酸碱度等。建议对地下水等级评价结果为V类区域,严禁将地下水作为生活饮用水,合理开发利用地表水或远距离调水。

There are Permian,Triassic,Jurassic and Cretaceous intrusions in Qiongzhong County,Hainan Province.They are mostly granite and granodiorite with relatively underdeveloped geological structure,and account for about 86%of the county area.The water richness of groundwater varies greatly,and the quality of groundwater is unknown.In order to find out the current situation of groundwater quality in Qiongzhong County,136 groups of groundwater samples were collected,and 56 evaluation indicators were determined.The single-factor evaluation method and the comprehensive quality evaluation method were used to evaluate the quality of the collected groundwater samples.The evaluation results show that the groundwater quality in Qiongzhong County is generally good,and the distribution area of grade I~III groundwater is 2156.47 km^(2)which accounts for 80%of the total county area.The natural chemical components affecting the groundwater quality include mainly iron,manganese,aluminum,nitrate,pH,etc.The areas of grade V groundwater should be strictly prohibited to use groundwater as domestic drinking water,and reasonably utilize surface water or long-distance water.