كليدواژه :
آسيب پذيري , DRASTIC , تجزيه حساسيت , آبخوان قزوين , سامانه داده هاي جغرافيايي
چكيده لاتين :
The Overlay Index method is used to evaluate the groundwater vulnerability as well as aquifer vulnerability mapping. This method uses the groundwater depth, hydraulic conductivity, net recharge, soil type, topography, unsaturated zone effect, and aquifer perimeter. However, selection of the rate and weight of each parameter is important. The paper deals with the application of sensitivity analysis for DRASTIC Overlay Index method in Ghazvin plain. The presented analysis in this research has evaluated the influence of the parameters rating and weighting based on the map removal and single-parameter sensitivity analysis. The results of map removal sensitivity analysis show that seven DRASTIC parameters should be considered together. The hydraulic conductivity has the highest sensitivity. On the other hands, the results indicate that groundwater depth strongly affects vulnerability in the region but the most unexpected results is the perimeter of aquifer which mostly influences the vulnerability index, with an average weight of 25.4% against the theoretical weight of 13%.This practical method provides a methodology for the evaluation of vulnerability mapping and for more reliable interpretation of vulnerability DRASTIC index in this region.
