Abstract
Mianyang City is located in the varied topographic areas of Sichuan Province in southwestern China and is characterized by a complex geological background. This area is prone to disasters and its varied topography is inconvenient for emergency water storage and supply. Groundwater is essential for alleviating the demand for water and post-disaster emergency water supply in this area. This study applied AHP to integrate remote sensing, geological and hydrological data into GIS for the assessment of groundwater potential, providing a plan for the rational exploitation of groundwater and post-disaster emergency water supply in the area. Nine factors, including the spring calibration related to groundwater, were integrated by AHP after multicollinear checks. As a result, the geology-controlled groundwater potential map was classified into five levels with equal intervals. All the results were validated using borehole data, indicating the following: the areas with yield rates of <1t/d·m, 1–20 t/d·m, and 20–400 t/d·m accounted for 2.66%, 36.1%, and 39.62%, respectively, whereas the areas with yield rates of 400–4000 t/d·m and >4000t/d·m accounted for only 20.88% and 0.75% of the overall area. The flexibility of this quick and efficient method enables its application in other regions with a similar geological background.
Highlights
Groundwater is a valuable resource that is crucial for ecosystems and human civilization, but population growth and agricultural expansion are placing increasing pressure on groundwater resources that need to be managed rationally [1,2]
The results show that the integration of a moderate amount of multi-source data using the analytical hierarchical process (AHP) method can reasonably assess varied topographic areas with complex geological backgrounds
Topographic factors, geological factors, groundwater recharge factors, and enhanced vegetation index (EVI) were established based on the previous literature
Summary
Groundwater is a valuable resource that is crucial for ecosystems and human civilization, but population growth and agricultural expansion are placing increasing pressure on groundwater resources that need to be managed rationally [1,2]. Mianyang City is a varied topographic area of Sichuan Province in southwestern China. Several disasters, such as earthquakes and landslides, have occurred in the area due to strong tectonic activity [3]. The topography of the area makes the fast and efficient demand of emergency water storage and supply necessary. Groundwater serves as an important source of water and can effectively meet this demand [4], which is a key emergency water supply resource during post-disaster reconstruction processes [5]. One of the most valuable advantages of groundwater is that it is less susceptible to environmental contamination than surface water, which is very helpful for both emergency water supply and domestic drinking water [6]. Assessing local groundwater potential is essential for sustained development
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