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为了解秦皇岛洋戴河流域浅层地下水咸化程度,开展了野外调查和水样采集,现场测试EC、TDS指标,并对水样进行了室内水化学分析。应用层次分析法结合Arcgis对选取的6个指标(Cl离子、TDS、Li离子、钠吸附比、硝酸盐、潜在盐度)进行权重计算、归一化处理和栅格计算,得出地下水咸化等级分区(未咸化区、轻微咸化区、中等咸化区、严重咸化区)。咸化最严重区域位于沿海平原,包括枣园村、王各庄村。中度咸化区部分位于沿海平原,包括都寨村、西陆庄村、蒋营村、樊各庄,主要是由海水入侵导致的;而樊各庄咸化的原因是海水入侵和工业废水的污染;其他中度咸化区位于低山丘陵区,包括大湾子村、兴隆寨村,则是由水岩作用、农业污水、生活污水造成的。轻微咸化区主要分布在中等咸化区周围,未咸化区集中在山前平原区。
In order to understand the degree of shallow groundwater salinization in the Yangda River basin of Qinhuangdao, field investigation and water sample collection were carried out. The EC and TDS indexes were tested on site, and the indoor water chemical analysis of water samples was carried out. The analytic hierarchy process (AHP) and Arcgis were used to calculate the weights of six selected indicators (Cl, TDS, Li, sodium adsorption, nitrate, potential salinity) Grading (unsalted, slightly salty, moderately salty, severely salted). The most salty areas are located in the coastal plains, including Zaoyuan Village and Wanggezhuang Village. The moderate salty areas are partly located in the coastal plains, including Duzhai Village, Xilu Village, Jiangying Village and Fangezhuang, which are mainly caused by seawater intrusion; and the reason for Fanzhuang’s salinization is seawater intrusion and industrial wastewater pollution Other moderate salinization areas are located in hilly areas, including Dawanzi Village and Xinglongzhai Village, which are caused by water-rock interaction, agricultural sewage and domestic sewage. Slightly salty areas are mainly distributed around the middle salty area, un-salty area concentrated in the piedmont plain area.