Document Type : Research Article
Authors
1
Department of Physical Geography, Faculty of Earth Sciences, Tehran Shahid Beheshti University
2
Department of Physical Geography, Faculty of Earth Sciences, Tehran, Shahid Beheshti University
10.22067/geoeh.2024.88423.1493
Abstract
As a part of an interactive system with the earth's surface, Groundwater is in the realm of geomorphological influence and is largely influenced and controlled by landforms and processes and can affect the quantity and quality of Groundwater. One of the important landforms in the geomorphology of arid and semi-arid regions of Iran are alluvial fan, which, due to their unique structure, provide a very suitable environment for Groundwater storage. In this research, an attempt has been made to analyze the relationship between the quantitative and qualitative changes of Groundwater with the characteristics of alluvial fans in the southern plains of Central Alborz, so as to provide a suitable model based on geomorphic parameters for the qualitative and quantitative potential of Groundwater. gave Based on this, by means of satellite images and topographical maps, the borders of 23 alluvial fans were first drawn and 11 morphometric parameters were extracted, including sweep angle, area, volume, concavity, slope, top and base height, length, base length, radius and height difference of alluvial fans. Also, the relationship between the depth of the water table, well discharge and electrical conductivity of Groundwater with morphometric parameters in 587 water well rings was evaluated using statistical analysis. The results showed that the changes in discharge, electrical conductivity and depth of water table are influenced by the morphometry of alluvial fans by 63%, 27% and 54% respectively. The Groundwater increases, and with the increase in volume and concavity, the amount of electrical conductivity also increases. The findings of this research have shown that the characteristic of alluvial fans can be used as a model in evaluating the quantitative and qualitative changes of Groundwater in dry areas.
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