The Determination of Probable Subsidence Areas of Ardebil Plain by the Use of GIS

Ardebil plain، an area of approximately 1097. 23 km2 in geographic coordinates of 38˚ 5¢ to 38˚ 27¢ north latitude and 48˚ 9¢ to 48˚ 37¢ eastern longitude، is a valley plain. During recent years، groundwater has been stuck with eye drops. This article reviews the changes occurred in the volume of water aquifer and the rate of decline in groundwater in the plain out of the data from wells by using the software ArcGIS، piezometers maps and drop zone in the area under study. Graphical maps showed that the highest rate of water loss has occurred in the southeastern region. The zoning plan was provided، and it showed that 14% of the drop zone area was in the high plains، 29. 73% in the high zone، and 26. 6% in the intermediate zone، 17. 38% in the low zone and 12/29% of the drop zone are low. The results indicate that the aquifer is in a critical condition in Ardebil. To explore the possible future subsidence، affecting layers included: precipitation، slope، hydrology، lithology، geomorphology، soil، vegetation and human factors extracted from maps and combining layers in GIS. map projections drop of water method were developed in the future using underground Co-Kriging point. The results showed that it is most likely that in the future Ardebil method subsidence would occur due to excessive removal of groundwater resources in the south east will and human activity in the west plains subsidence are the second risky factor.