Evaluation of the River-Shallow Aquifer Exchange Process Effect on Surface Water Quality Deterioration

Recently, according to a survey carried out in Oued El Abid River by Oum Er-Rbia Hydraulic Basin Agency concerned about the surface water quality, the downstream course is undergoing continual degradation in its water quality comparable to the upstream. This study comes to localize the sources of pollution and explains the process of degradation, which affects the water quality in that area. For this purpose, an inspection of the place has been done during January 2017 to cover the entire zone limited by the affected part of river, followed by a survey, which interests to water quality and the ground-water depth. The inspection doesn’t show any direct liquid discharge into the river;meanwhile the water quality degradation is related to the underground sources through river-shallow-aquifer exchange process, when the obtained results from the survey showed that severe parameters are involved in the degradation of groundwater, as the geology and agricultural activities. Combining these results with flow direction in groundwater, it is clear that pollutants are transported to the river via the river-shallow aquifer exchange process, which affects its quality. Based on the finding results, this study will give the decision makers a simple view to a complex pollution processing.

松花江沿岸某城市浅层地下水有机污染特征

对2005年11月12日中石油吉林石化分公司双苯厂发生爆炸事故所引起的松花江沿岸某城市浅层地下水污染状况进行了调查研究。结果表明,研究区浅层地下水中,除1,2-二氯丙烷、氯苯、苯和乙苯浓度在个别采样井点检出超过《地下水质量标准》三类水质标准外,其它各有机污染物浓度都普遍较低;城区浅层地下水有机污染程度远远重于城郊,且分布在城区东部化工厂一带的工业区,个别地段地下水有机污染程度不容乐观。因此,松花江水与地下水的积极交替带仅限于几百米,研究区内浅层地下水的有机污染是历史因素和人为活动共同作用的结果。

淮河流域(安徽段)浅层地下水有机污染特征

通过对淮河流域安徽段地下水污染调查,在获取大量第一手资料的基础上对研究区浅层地下水有机污染特征进行分析研究,结果表明,浅层地下水已经受到一定程度的有机污染,检出率相对较低,检出含量也不高,仅局部地段存在超标现象;空间分布上呈现散点状和局部地段的聚集性,与地表的污染源密切相关。

长期排污河道清淤对浅层地下水环境的影响

利用水质检测数据,开展凉水河截污清淤前后河道两侧浅层地下水水环境对比,研究表明:清淤后,浅层地下水污染程度加重,地下水的总硬度和溶解性总固体(TDS)显著升高。因此,在河道满足行洪能力、河水水质尚未大幅度改善的情况下,应慎重清淤。