نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشآموخته کارشناسی ارشد، گروه زمینشناسی، دانشکده علوم، دانشگاه ارومیه، ارومیه ، ایران.
2 استادیار، گروه زمینشناسی، دانشکده علوم، دانشگاه ارومیه، ارومیه، ایران.
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
Land subsidence, a geo-environmental hazard, is mainly associated with long-term decline in groundwater level and excessive groundwater extraction. The Salmas plain (NW Iran) experienced considerable subsidence (~12cm/yr). This study aimed to determine the areas susceptible to land subsidence in the Salmas plain. The GARDLIF framework was used to assess the spatial susceptibility to land subsidence based on seven hydrogeological and environmental parameters: groundwater-level decline (G), aquifer media (A), groundwater recharge (R), aquifer discharge or pumping (D), land use (L), aquifer thickness (I), and distance from faults (F). The thematic layers were ranked, weighted, and integrated using ArcGIS to evaluate the GARDLIF susceptibility index. In addition, the Grasshopper Optimization Algorithm along with an Artificial Neural Network (GOA-ANN) was applied to optimize the susceptibility assessment. According to the GARDLIF model, the Salmas Plain was classified into moderate, high, and very- high areas, accounting for 14.1%, 58.1 %, and 27.8% of the study area, respectively. Based on the GOA-ANN model, the Salmas Plain was classified as 8.2%, 45.3%, and 46.5% of the area into the moderate, high, and very-high susceptibility classes, respectively. A strong correlation (r= 95%) was observed between the two approaches. Based on sensitivity analysis, groundwater-level decline (G) and aquifer discharge (D) were the most influential parameters, with mean sensitivity values of 0.27 and 0.15, respectively. Whereas distance from faults (F) had the lowest influence (0.0025). The highest susceptibility areas occur mainly in western and southern parts of the plain, including areas around Qareh Qeshlaq, Tazeh Shahr, and Salmas. Field evidence, including sinkholes and surface cracks, is consistent with the predicted susceptibility patterns. Groundwater-level decline and excessive groundwater pumping are the principal factors controlling land-subsidence susceptibility in the Salmas Plain. The close agreement between the GARDLIF and GOA–ANN models, together with field evidence, supports the reliability of the susceptibility assessment.
کلیدواژهها [English]