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1- Yazd university , goodarzimr@yazd.ac.ir
2- Yazd university
Abstract:   (1564 Views)
In arid and semi-arid, groundwater is more important for humans and ecosystems than surface water. Land subsidence is caused by the pumping and uncontrolled use of groundwater in an area. When harvested quantities aren’t compensated by rainfall, it causes damages such as road failures, destruction of residential areas, railways, and water and gas pipelines. Yazd-Ardakan plain is one of the important plains of Yazd province, which has 75% of the population density of the province and the most industrial centers. In addition, this plain has been banned by the Ministry of Energy due to a sharp drop in groundwater levels. In this study, the amount of subsidence was obtained and compared using 4 SLC images of the C-band of the Sentinel-1 satellite and the radar differential interferometry method from 2017 to 2021. The maximum amount of subsidence in 2017 was 13 cm and in 2020 and 2021, 9 cm, which is related to the Shamsi region in the area between Meybod and Ardakan. Also, to ensure the results of satellite images, they were compared with the results of the accurate leveling method performed by the Iran National Cartographic Center. It was observed that sentinel images have a good ability to estimate the amount of subsidence. According to the study of groundwater consumption and depletion statistics in recent years, possible reasons for the reduction of subsidence in the study area can be management measures such as water transfer to this basin, change in agricultural practices and reduction of groundwater depletion compared to years ago in this area.
     
Type of Study: Research | Subject: Geography Information System
Received: 2021/08/31 | Accepted: 2021/10/23

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