Pollution potential assessment of Jarmeh plain groundwater with use of SINTACS and DRASTIC models in GIS media

This study carried out for considering the intrinsic vulnerability of Jarmeh plain aquifer using from DRASTIC and SINTACS models with respect to increasing groundwater resources contaminations and quality deterioration by agricultural activities, industrial and urban development. Although, cleaning up of groundwater contamination is very costly and long process and often occurs when contamination is detected that decontamination of the aquifer is almost impossible. One of the methods for preventing groundwater pollution,identify areas vulnerable aquifer. For both models, seven hydrological and hydrogeological parameters such as depth to water table, net recharge, aquifer media, soil media, the impact of the vadose zone, hydraulic conductivity and topography were used. After preparing the layers of each of the parameters in the GIS, the layers have been combined together and the final map was prepared for the plain vulnerability. For ensuring from results of the vulnerability models nitrate data collected from 36 wells in August 2012 were used. For models optimization and efficiency, the correlation between each of the parameters with the values of nitrate was considered and according to the correlation results and expertise the model parameters were changed and the weight of each final map was prepared. DRASTIC and SINTACS models showed 46 and 58 percent correlation with nitrate values respectively. Sensitivity analysis was investigated to determine the most effective factors using map removal and single parameter methods. The results of both methods show that the vadose zone is the most important factor on groundwater vulnerability in the study area. Vulnerability index obtained for DRASTIC model was from 61 to 130 and for the SINTACS from 65 to 145. The SINTACS model determines the intrinsic vulnerability of the Jarmeh plain better than the DRASTIC model.

کلیدواژه ها:

intrinsic vulnerability ، Jarmeh plain ، DRASTIC ، SINTACS