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.