Figure 4. Contour of groundwater level for 270 days of pumping
is relatively low, and the water level in the middle location is higher
than that on the two sides. As the pumping continues, the pumping time
reaches 270 days, and the base flow from zone 1 to zone 2 is reduced to
1525.8 m3/d. At this time, the area of the cone of
depression also increases with the pumping time. The water level at the
location of the pumping wells also decreased to 7.0 m, as shown in
Figure 5. The figure also shows that the hydraulic gradient has reversed
in the middle of the wetland and at the pumping well, and the
groundwater flow direction has changed from east to west, which means
that the groundwater divide has gradually spread to the wetland with
increasing pumping time (Figure 5, red dotted line), and this process is
the second process of wetland–aquifer interaction.