基于物元可拓模型的天津浅层地下水水质评价

Evaluation on shallow groundwater quality in Tianjin Areas based on matter-element extension model

采用物元可拓模型,对天津市平原区浅层地下水水质进行了定量评价。结果表明,抽样检测的18组样品的水质类别80%以上处于Ⅳ和Ⅴ级,NO-3、NO-2和总硬度等是主要的权重影响因子。研究区地下水水质总体较差,当地特定的地质环境背景及人类经济活动是导致区域浅层地下水水质污染的主要原因。为验证评价结果的准确性,采用传统的综合评分法进行比较分析,发现同批次18组样品中,15组样品评价结果完全一致,准确率达83%以上,另3组评价结果相差一个等级,可能与不同评价方法的评价等级区间划分有关。对比结果显示,物元可拓模型在天津市浅层地下水质评价中具有较高的可信度,是地下水水质定量评价的一种有效方法。

A quantitative evaluation on shallow groundwater quality in Tianjin plain areas was made based on the matter-element extension model. The results show that over 80 percent water samples in 18 groups of samples for sampling detection were in grade 1V and grade V, and nitrate, nitrite and total hardness were the main weighting factors. The water quality of the shallow groundwater in study area was poor as a whole. The main reasons of groundwater pollution are the specific local geological environment background and the human economic activities. In order to verify the accuracy of the evaluation results, a comparative analysis was made by using traditional synthetic scored method, finding that among the same batch of 18 groups of samples, 15 groups of sample evaluation results are entirely consistent, with the accuracy rate of more than 83%. The evaluation results of another 3 groups of samples differ one grade, which may be related to the evaluation grade interval division in different methods. The contrast results show that there is a higher reliability in the evaluation results of shallow groundwater quality based on the matter-element extension model. The matter-element extension model could be an effective method to quantitatively evaluate the groundwater quality.