Evaluate the potential of karaj city subsidence using a weighted combination of the GIS environment

Kiani, Fatemeh (2018) Evaluate the potential of karaj city subsidence using a weighted combination of the GIS environment. Masters thesis, university of Mohaghegh Ardabili.

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Text (بررسی پتانسیل فرونشست شهرستان کرج با استفاده از روش تلفیق وزنی در محیط GIS) Fatemeh kiani.pdf Download (355kB) | Preview

Abstract

Abstract: The city of Karaj is one of the cities of Alborz province and the capital of the newly established province of Alborz. The legal scope of this city is about 19458 hectares, according to the 2011 survey. In order to study the susceptible areas of the subsidence phenomenon in the city at first, all the indicators and parameters that may somehow be involved in the subsidence phenomenon were identified and according to the experts' opinions, the questionnaires of the pair comparison were considered respectively two and two, and using the The network analysis process (ANP) and Super Decision software were calculated. Raster layers for each of the factors were prepared using the GIS software in the Arc Map. Using SAW method, the weighting of the parameters in the GIS environment was combined and finally the final layer was linearized and then the priority of the regions Different in terms of talent for the occurrence of subsidence phenomenon. According to the results, about 25.7 sq. Km of the area of the city of Karaj is considered as a high risk area, and about 16% of the total area of the city is at high risk of subsidence, which includes areas with high concentration of wells and the highest The rate of underground water drainage, and the concentration of existing cities and villages, as well as the supply of water to the industrial sector, including factories and agriculture. The status of groundwater drainage in the city shows that during the 14year statistical period, the water fluctuation of the underground water is about -15 and 14 meters. The highest annual water consumption is 800,000 and 1,256,711 cubic meters, respectively, in the Karaj plain and Mohammad Shahr. In general, more groundwater harvesting along with water drops will increase the potential for subsidence, and the existence of loose alluvial soils in the central part of Karaj Plain and Mohammad Shahr has caused more talent in this section to be abandoned. Finally, suggestions were made to prevent the occurrence of subsidence events. .

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