Recognition of Favourable Groundwater Contamination Zones with Karst Evolution Zonation Using GIS (Case Stady: Kermanshah Province)

The Large numbers of provinces in country use Karst's water Sources as a main Source of securing water for using in different ground of drinking-agriculture and industry. Kermanshah province with an area about 24953,286 square kilometers is located in the middle of western side of the country which its main part is in the zones of nappe and foliated Zagross and its heights are often formed of the hard carbonated formations. The Karsti zonations of Kermanshah province play an important role in the providing and feeding of aquiferouses; for this reason to recognize these zonations and the rate of their modification, the zonation of the modification of the karst is done in this research and its map has been drawn too. For the purpose of acquiring of the aims of the research, first the closed superficial holes as the index of the modification of the karst were recognized by using the topographic maps 1 / 50000 and the recognizing pictures 5 meters irs (BW), their maps were drawn and after examining statistically and confirm the relationship the maps with the subject, with the help of the Kay square and the rotary operation, seven factors of height, lithologic, geomorphology, temperature, rainfall, vaporization and slope as the effective factors in the modification of the karst have been selected. After digitalization of all of the respective data for evaluation (giving weight) the classes of the maps of aquired from the statistics ways, analysis of the hierarchic (expertizing judgement), condensation of the surface, the informational value, the variables weight and the experimental way were used. Then in the environment of gis the maps of the factor of overlapping and the maps of the zonation the modification of the karast has been aquired with the 5 ways mentioned. Among the ways used for zonation, the way of the informational value has the most adaption with the selected index (the closed holes) in the zone being studied. The aquired maps of zanation, beside the determinination of the zones with different degrees of modification of the karst's from in the province, It also has detemined the feeding Limitations of underground waters (Karst) and the favourable areas for Pollution of these Sources in the surface of earth.Which should use Suitable Policy for protecting these areas, Other wise many gangers will threat the feeding places.