Investigation of ground subsidence rate using radar interferometry (D-InSAR)In Nabahband – Sahelabad Plain
Subject Areas : Applications in natural hazard and disastersamad fotoohi 1 , sayed ali almodaresi 2 , roghaiyeh delaram 3
1 - Associate Professor Department of Phsical Geography, Faculty of Geography and Environmental Planning, University of Sistan and Bluchestan, Zahedan, Iran
2 - Vice Chancellor of Islamic Azad University of Vahedizd and a member of the faculty
3 - Department of Geomorphology, Faculty of Geography and Environmental Planning, Sistan and Baluchestan University,zahedan.iran
Keywords: KEYWORDS: Radar Interferometry, Subsidence, Nehbandan, Groundwater drop,
Abstract :
AbstractLand subsidence occur due to the natural and human activities. One of the main causes of subsidence is the excessive usage of groundwater resources. In the study area, due to the dry and desert area, low rainfall and lack of permanent rivers, the most use of groundwater resources is that in this area we see many wells for agricultural use. Various types of deformation surveying technique have been used widely to measure the land subsidence pattern.This research is based on radar remote sensing method and field study. First, satellite data and images were examined and processed using the remote sensing method. To investigate the temperature, the radar interference technique was used to process the radar images at specific intervals. The images used relate to the ASAR Envisat satellite in the C band from 2003 to 2010 and the pair of images of the Sentinel 1 satellite in the C band from 2019 to 2020. The results of this technique show that the highest amount of subsidence related to the agricultural lands in the center and north of the plain is about 13.4 cm in the period 2007 to 2010 and also in the period 2007 to 2008 about 13.1 cm. We see the subsidence meter. In the new study of Sentinel1 satellite images in the period 2019 to 2020, this area has also experienced a subsidence of 5.9 cm, which indicates the continuation of subsidence in this region. To verify the results, statistics related to piezometer wells were used and the results show a decrease in groundwater level in the study area in the period 2007 to 2010.
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