Numerical Analysis of Land Subsidence due to Water Withdrawal from Pumping Well in Urban Areas

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Ansari Shad Mojtaba; Noorian-Bidgoli Majid

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Journal Paper

Paper Information

Journal: Journal of Water and Wastewater Science and Engineering Year:2022 | Volume:7 | Issue:2 Page(s): 42-52

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Information Journal Paper

Title

Numerical Analysis of Land Subsidence due to Water Withdrawal from Pumping Well in Urban Areas

Author(s)

Ansari Shad Mojtaba | Noorian-Bidgoli Majid | Issue Writer Certificate

Keywords

Finite element method (FEM)

Ground water

Kashan City

Land subsidence

Plaxis Software

Abstract

Land subsidence is defined as equal to the vertical displacement of the ground over a specified time. Declining water table elevation is one of the main causes of subsidence that can cause irreparable damage to surface and subsurface structures, especially in urban areas. In this research, the magnitude of subsidence due to water withdrawal from the pumping well has been estimated, and the factors affecting it have been determined. For this purpose, by collecting data from two water wells located in Kashan City, the subsidence analysis was performed based on the finite element numerical method using PLAXIS2D software. The results show that the water pumping during one year causes a decrease in the water table elevation and, as a result, the Land subsidence by a few centimeters, but under a constant flow rate of water withdrawal from the well, the magnitude of subsidence in the studied wells is heterogeneous. Also, increasing the water withdrawal flow rate from wells up to 700 m3/day and the depth of wells up to 500 meters has increased subsidence, but after that, the amount of subsidence remains constant. Therefore, it can be concluded that the flow rate and depth of water withdrawal from the well are effective on the Land subsidence and must be managed.

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