Climatology
Ali Mohammad Khorshiddoust; Robab Razmi; Nasim Maiali Ahari; Karim Abbaszade
Abstract
Subsidence is a natural phenomenon which can be reinforced by the interferences and activities of human beings. Ghaleh area in Tasuj is located in North Eastern part of Uremia Lake. The frequent occurrences of draught, expansion of agriculture and the over-population and thus over-exploitation of the ...
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Subsidence is a natural phenomenon which can be reinforced by the interferences and activities of human beings. Ghaleh area in Tasuj is located in North Eastern part of Uremia Lake. The frequent occurrences of draught, expansion of agriculture and the over-population and thus over-exploitation of the water belonging to underground beds and the delicate texture of soil have caused subsidence in some parts of the area. Regarding the existing evidences, the researchers are going to investigate the source of such a phenomenon in this area. To do so, we have used Geomorphologic and geologic data plus fault maps and hypsometric levels during 11 years period (2001-2011). integration and analysis of the maps by using ARC GIS software and the preparation of isopies maps for each of the monthly and annual by using Surfer win software and the cluster analysis based on tree diagram, showed that during the 11 years the amount of subsidence has increased due to the considerable reduction of underground water levels in some parts of the area such as Ghaleh village. On the other hand human factor has been recognized as the most important factor for the subsidence in the area.
Abolghasem Amirahmadi; Nasim Maali Ahari; Tayebeh Ahmadi
Volume 17, Issue 46 , February 2014, , Pages 1-23
Abstract
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 ...
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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.
