基于模糊数学的德阳市平原地下水环境质量评价

ENVIRONMENTAL QUALITY EVALUATION OF DEYANG PLAIN GROUNDWATER BASED ON FUZZY MATHEMATICS

通过调查德阳市浅层地下水环境,采取79组地下水水样并进行水质分析,选取其中10个评价指标,采用模糊数学评价方法,以MATLAB为计算平台,对德阳市平原地下水进行综合评价,得出区内Ⅰ类水样占总数的22.8%;Ⅱ类占38.0%;Ⅲ类占22.8%;Ⅳ类占2.5%;Ⅴ类占13.9%,地下水水质以中等偏好为主,结合综合指数法对比分析表明模糊数学评价法更加综合合理。区内地下水污染趋势由西向东逐渐加强,污染较严重主要集中于西南部和城市周边区域。导致区内地下水污染的主要因素是Fe、Mn、总硬度、三氮等指标。

Based on the investigation of shallow groundwater environment in Deyang City,this paper collected 79 groups of groundwater samples and conducted relevant water quality analysis,ten of which were selected as the evaluation indexes. A comprehensive evaluation of Deyang groundwater was conducted by resorting to fuzzy mathematics as well as the computing platform of MATLAB. This paper drew a conclusion that water sample I,sample II,sample III,sample IV,sample V accounted for 22. 8%,38. 0%,22. 8%,2. 5% of the total. The groundwater quality was largely at a moderate state. This paper conducted comparative analysis by resorting to comprehensive index method,and proved fuzzy mathematics more comprehensive and reasonable. Also,groundwater contamination in this region took on a gradually deteriorating trend from west to east and pollution mainly distributed in southwest as well as in peri-urban areas. Such indexes as Fe,Mn,total hardness and nitrogen were the main causes of groundwater contamination in this region.