Document Type : scientific-research article
Author
Department of Geography - Payam Noor Neyshabur University
Abstract
Abstract
Land subsidence is a phenomenon that has occurred in most of the alluvial plains of Iran in the last few decades as a result of the gradual or sudden lowering of the land surface due to various factors such as excessive extraction of groundwater, tectonic activities, mining, etc. Neyshabur Plain is not an exception to this rule and due to the indiscriminate extraction of underground water in the last few decades, the level of underground water table and hydrostatic pressure has decreased, as a result, subsidence has occurred and affected rural and urban areas. have given. Neishabur Plain with an area of 3477 square kilometers, in an area of 591 square kilometers with a population of59 thousand people and 179 villages is facing severe land subsidence. In this research, an attempt has been made to investigate the relationship between the underground water level and the areas that are facing the phenomenon of subsidence. Investigations show that for every 83 cm decrease in the level of underground water, an average of 10.5 cm of the surface of Neyshabur Plain has subsided. In this research, Sentinel satellite images in the period from October 2013 to December 2016, which were prepared by the Mapping Organization using the radar interferometry method, were used. The results of the research indicate that the indiscriminate exploitation of underground water resources causes land subsidence and creates gaps in rural areas, especially around the villages of Firuzeh, Abu Saadi, Birum Abad, Faiz Abad, Sarab Koushak, Urdughash, and Farrokhak to the extent of 15 20 cm per year, with the highest and lowest subsidence corresponding to the villages of Dasht, Mehdi Abad, Khorsafla, one centimeter per year.
Keywords: water crisis, land subsidence, radar interferometry, rural areas, Neyshabur Plain
Keywords
Main Subjects
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