Determination of Mining-Induced Changes in Hydrogeological Parameters of Overburden Aquifer in a Coalfield, Northwest China: Approaches Using the Water Level Response to Earth Tides

Figure 9

Variations of water level, permeability, and specific storage of J7 and J10 as a function of longwall coal face location relative to borehole location. Negative values represent a coal face location before it reaches the borehole location, where positive values represent the location of the coal face after undermining. The dash lines show the times when the longwall excavation zone is closest to the J10 and J7 wells, respectively.