| Abstrakt: |
Groundwater vulnerability assessment is an effective tool for groundwater pollution prevention and control. The DRASTIC model was improved, to establish an evaluation model suitable for alluvial-prouvial fan areas and conduct groundwater vulnerability evaluation. Alluvial-prouvial fan area shows good hydrodynamic conditions, landform, lithology, and underground water zone. According to its hydrogeological characteristics, DRSTIC model with four hydrodynamic condition indexes (depth to groundwater, net recharge,topography and hydraulic conductivity ) and two medium attribute indexes (soil media and impact of vadose zone ) was established. Analytic Hierarchy Process (AHP) and ArcGIS 10.3 platform were used to calculate and evaluate the Northeast Plain of Beijing for example. The results show that 62.0% of the study area has higher groundwater vulnerability, with a total area of 336.4 km2, and the groundwater vulnerability is generally high. The results of single parameter sensitivity analysis and map removal parameter analysis show that the effective weight of each index is in line with the order of theoretical weight, which indicates the rationality of the weight of groundwater vulnerability assessment index. And at the same time, it reflects the importance of the medium in the vadose zone and the depth of groundwater to the vulnerability of groundwater. [ABSTRACT FROM AUTHOR] |
