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利用主成份分析方法以及Arcgis软件,选取了重庆岩溶地区70条地下河中13个水文地球化学指标,分析了目前该地区地下河水污染规律。主要结果如下:1)对岩溶地下河水13个水化学指标进行主成份分析,得到人类活动的主要因子(Ec,SO_4~(2-),NO_3~-,Na~+,Cl~-,K~+,Sr~(2+))以及水-岩作用因子(Ca~(2+),HCO_3~-,pH值)。2)对人类因子和水-岩因子进行空间分析,发现地下河水的离子浓度在空间上的分布大多为主城周边地区最高,然后依次为渝东地区、渝东南地区、渝东北地区。研究认为,上述空间格局的分布受到人类活动、工业活动或者农业活动的密集程度影响,因此缓解地下河污染需要从工业、生活污水、农业灌溉等多渠道源头控制。
Using principal component analysis and Arcgis software, we selected 13 hydrogeochemical indicators from 70 underground rivers in Chongqing karst area and analyzed the current underground water pollution rules in this area. The main results are as follows: 1) Based on the principal component analysis of 13 water chemistry indicators of karst underground water, the main factors of human activity (Ec, SO_4 ~ (2 -), NO_3 ~ -, Na ~ +, Cl ~ +, Sr ~ (2+)) and water - rock interaction factors (Ca ~ (2 +), HCO_3 ~ -, pH). 2) Spatial analysis of human factors and water-rock factors shows that the spatial distribution of ion concentration in underground river water is mostly the highest around the main city, followed by the eastern part of Chongqing, the southeast of Chongqing and the northeast of Chongqing. The study suggests that the distribution of the above spatial patterns is affected by the intensity of human activities, industrial activities or agricultural activities. Therefore, it is necessary to control the underground river pollution from multiple sources, such as industry, domestic sewage and agricultural irrigation.