淄博大武地下水源地污染风险评价

Pollution risk evaluation of Dawu groundwater source site in Zibo City,Shandong

根据淄博大武地区的水文地质条件,对大武水源地北方型裂隙岩溶特点进行分析,结合欧洲方法和《地下水污染源清单:方法指南》并进行修改,制定了符合研究区实际情况的指标,利用ArcGIS叠加分析法对该地区的水源脆弱性、地下水资源污染风险和地下水水源污染风险进行了评价。结果表明,研究区南部石灰岩裸露区脆弱性高;北部平原区中段位于目标水源汇水区或过渡区,对目标水源的脆弱性影响较大,但凭借第四系沉积物的保护,其水源脆弱性为中等。南部和北部工业企业园区的地下水资源/水源污染风险均为高,极易被附近的工业企业污染,因此必须做好污染物处理和工业区地面防渗工作,以确保水源地的饮水安全。

In this paper, we would like to present our analysis results of the characteristic features of Dawu groundwater source in Zibo City, Shandong, based on the analysis of the local realistic hydro-ge- ological conditions. Dawu Well Field is a scarcely found super-sized fracture-karst groundwater source in the noah of China, which can be said of strategic significance and is expected to provide plenty of drinking water for the local people as well as an abundant water ener- gy resource for the social and economic development of the city. However, since the water source suffers from some kind of complicat- ed pollution, it tends to bring about harm and risk to the local public health. Thus, it has become one of the urgent tasks for the local gov- ernment and people to harness the pollutants from the water source to guarantee the sustainable development of the city. For this purpose, we have done careful studies of the Groundwater Contamination In- ventory： a Methodological Guide issued by the UNESCO in 2002 and properly accommodated it to the actual need of ours. While refer- ring to the above said guide, it has become clear that the groundwater source of Zibo is good like gold, yet hazard of some kind of pollution and vulnerable in some of its limestone structure. By means of over- lays analysis known as the ARCGIS, we have graded the groundwater source vulnerability of Zibo in accordance with the concentration of flow, the precipitation regime, the karst saturated zone, the point pollution source hazard and the non-point pollution source hazard via the coveting overlaying layers. We have also assessed the groundwa- ter source on spot by scoring its superposition. However, with the protection of dozens of meters of quaternary sediment, its water vul- nerability remains of middle level. The results of our investigation show that pollution hazards of the groundwater source are high mainly in the south limestone area and near the northern industrial parks. They are supposed to be easily affected by the pollution of the nearby industrial parks and enterprises, which reminds us to pay closer at- tention to the pollutant treating and the ground-surface seepage control in the industrial parks. Thus, it can be seen that the above investiga- tion and survey results are expected to produce great instructive effects on the soil and groundwater pollution treatment both on the city of Zibo and the other parts of the country with the similar problems.