DRASTIC与同位素方法在内蒙古呼和浩特市地下水防污性评价中的应用

以内蒙古呼和浩特市平原区地下水系统为例,采用传统DRASTIC方法和同位素3H浓度、3H与14C测年的新方法划分了不同的地下水系统防污性能区,开展了地下水系统防污性评价方法研究.研究结果表明, DRASTIC 方法评价结果显示了浅层地下水系统对来自垂向上污染物的固有防御能力;同位素方法评价结果反映了浅、深层含水层系统对来自补给区污染物的防御能力.并且文中指出了两种评价方法各自具有优、缺点.最后指出应根据区域水文地质条件、地下水开发利用现状,以及城市发展规划,采取DRSTIC和同位素辅助方法综合区划地下水系统的防污性能,为环境管理和决策者划分地下水源保护区,制定地下水保护措施提供科学依据.

The Application of DRASTIC and Isotope Method to the Evaluation of Groundwater Vulnerability in Hohhot, Inner Mongolia

Taking the plain groundwater system of Hohhot in Inner Mongolia as an example, the authors made vulnerability division of groundwater system by adopting the traditional DRASTIC and some new isotope dating methods based on concentrations of 3H, 3H and 14C. The methods of vulnerability evaluation of groundwater system were investigated. The evaluation results of the DRASTIC show that the shallow groundwater system can be protected against the pollution in vertical direction. The evaluation results of the isotope methods show that the shallow and deep aquifer system can be protected against the pollution from recharge areas. This paper also points out the respective advantages and disadvantages of the two means. Finally, it is pointed out that DRASTIC and isotope-assisted methods should be adopted on the basis of regional hydrogeological conditions, current groundwater exploitation situation and city development planning for comprehensive zoning of groundwater systems. The evaluation provides scientific guidance for environmental management, helps policy makers divide protection zones of underground water sources and work out groundwater protection measures.