Abstract
Ecological water supplement relies on river channels to introduce surface water, to make a reasonable supplement of groundwater, to repair the regional groundwater environment and urban river ecosystem. Evaluating the degree of groundwater restoration after ecological water supplement (by taking appropriate measures) is a critical problem that needs to be solved. Thus, based on the Yongding River ecological water supplement in 2019 and 2020, we analyzed the groundwater monitoring situates in the ecological water supplement region. We established an unstructured groundwater flow numerical model in the study area through the quadtree grids. The model was calibrated with the measured water level. The simulated results could accurately reflect the real groundwater dynamic characteristics, and it showed that the water level rise was concentrated in the 3–6 km range of the Yongding River after the ecological water supplement. In 2019, the calculated ecological water infiltration amount was 101.28 × 106 m3, the affected area was 265.19 km2, and the average groundwater level rise in the affected area was 2.10 m. In 2020, the calculated ecological water infiltration amount was 102.64 × 106 m3, the affected area was 506.88 km2, and the average groundwater level rise in the affected area was 1.25 m. While the ecological water supplement had a positive impact on groundwater level restoration, the groundwater level around the typical buildings within the study area, including Beijing West Railway Station and Beijing Daxing International Airport, would not be significantly affected.
Highlights
The calculated affected area was about 265.19 km2, accounting for 29.86% of the study area. It was distributed within about 6 km on both sides of the Yongding River channel; the widest impact range was located near the Lugouqiao barrage, reaching 9.7 km
Was distributed within about 6 km on both sides of the Yongding River channel; the widest impact range was located near the Lugouqiao barrage, reaching 9.7 km
(2) The total impact range of the ecological water supplement of the Yongding River in 2019 was 265.19 km2, which was concentrated in the 6 km range on both sides of the Yongding River
Summary
The Yongding ecological water in supplement plains region (Beijing section) is located in the southwest side of Beijing (China). 2. Under the influence of climate drought, irrational exploitation, and utilization. 888.72 km located in the southwest side of Beijing (China) (Figure 1a), with a total area of about of groundwater, thethe. Under influence of climate drought, irrationalstates exploitation, and utilization. Ject launched, two large-scale ecological water supplement were Restoration carried out in Management and tasks. The large-scale ecological ecological water supplement was fromtasks the Guanting. China) all ecological the way towater the south, by the San barrage, intoReservoir the plain River ecological water supplement plains region (Beijing section). Locationmap mapofofthe the (b) Distribution of the groundwater monitoring map of map the groundwater monitoring wells. Locationmap mapofofthe the (b) Distribution of the groundwater monitoring map of map the groundwater monitoring wells. wells
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