Document Type : Research Paper
Authors
1 Geomorphology, Planning and Environmental Sciences, Tabriz University, Tabriz, Iran
2 Tabriz University, Faculty of Planning and Environmental Sciences, Tabriz, Iran
Abstract
Land subsidence as a geological and geomorphological disaster has serious negative effects in many countries and regions of the world. In this research, it was tried to use 5 images of Sentinel 1 satellite for the period of 27/02/2017 to 01/01/2021 in order to measure and calculate the land subsidence. For this purpose, the land subsidence was investigated in four time periods, and the results of these four periods show the maximum amount of subsidence in the first period of 17 cm, in the second period of 8 cm, in the third period of 5 cm, and in The last period was 12 cm. In terms of the spatial distribution of subsidence in all periods, the maximum subsidence corresponds to the western and northwestern parts of the plain. In order to measure the land subsidence potential in the Kermanshah plain, a possible subsidence map was prepared using a hierarchical analysis model. In order to do this, eight factors affecting land subsidence were used, including water level drop, land use, well density, land slope, well geological log, slope direction, soil geology, distance from the river. The final map of the risk of land subsidence shows that 50% of the area of the plain is in the area with a very high and high probability of subsidence, with the highest level of water level drop and the thickness of sediments , the high density of the number of wells and the type of agricultural use that in It is located in the western and northwestern part of the plain. Due to the fact that this part of the plain is also in the maximum range of land subsidence. Therefore, the comparison of the maximum subsidence in both mentioned methods shows the complete matching of the results.
Highlights
Land subsidence as a geological and geomorphological disaster has serious negative effects in many countries and regions of the world. In this research, it was tried to use 5 images of Sentinel 1 satellite for the period of 27/02/2017 to 01/01/2021 in order to measure and calculate the land subsidence. For this purpose, the land subsidence was investigated in four time periods, and the results of these four periods show the maximum amount of subsidence in the first period of 17 cm, in the second period of 8 cm, in the third period of 5 cm, and in The last period was 12 cm. In terms of the spatial distribution of subsidence in all periods, the maximum subsidence corresponds to the western and northwestern parts of the plain. In order to measure the land subsidence potential in the Kermanshah plain, a possible subsidence map was prepared using a hierarchical analysis model. In order to do this, eight factors affecting land subsidence were used, including water level drop, land use, well density, land slope, well geological log, slope direction, soil geology, distance from the river. The final map of the risk of land subsidence shows that 50% of the area of the plain is in the area with a very high and high probability of subsidence, with the highest level of water level drop and the thickness of sediments , the high density of the number of wells and the type of agricultural use that in It is located in the western and northwestern part of the plain. Due to the fact that this part of the plain is also in the maximum range of land subsidence. Therefore, the comparison of the maximum subsidence in both mentioned methods shows the complete matching of the results.
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