Type-curve analysis of water-level changes induced by a longwall mine


Karaman A., Carpenter P., Booth C.

ENVIRONMENTAL GEOLOGY, vol.40, no.7, pp.897-901, 2001 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 40 Issue: 7
  • Publication Date: 2001
  • Doi Number: 10.1007/s002540100254
  • Title of Journal : ENVIRONMENTAL GEOLOGY
  • Page Numbers: pp.897-901

Abstract

Subsidence due to longwall mining creates long-term environmental effects, such as alteration of surface drainage patterns, changes in aquifer characteristics, and water-level drops in wells near the mine panel. Evaluating the impact of longwall mining on groundwater resources requires a knowledge of aquifer properties, both in front of, and behind, the mining face. In this study, we develop a a method based on the one-dimensional flow equation, and utilize type-curves to estimate an aquifer hydraulic diffusivity value from water level versus time measurements at a single well. We tested the method by calculating the hydraulic diffusivity value of the Trivoli Sandstone aquifer over a long-wall coal mine in the Illinois Basin, and our results reasonably close to reported values. The presented method significantly reduces the computational effort involved in: (1) predicting mine-induced water-level drops, and (2) determining the hydraulic conductivity and storage coefficient value representative of a larger aquifer volume, as compared to conventional aquifer test methods.