Impacts of Regional Groundwater Flow and River Fluctuation on Floodplain Wetlands in the Middle Reach of the Yellow River
| Autor: | Liheng Wang, Zhifang Xu, Yunmei Fu, Yanhui Dong, Yueqing Xie |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Hydrology
geography lcsh:TD201-500 Hydrogeology geography.geographical_feature_category lcsh:Hydraulic engineering Floodplain Groundwater flow Geography Planning and Development groundwater and surface-water interactions floodplain wetlands Aquifer Wetland Aquatic Science Yellow River Biochemistry remote sensing lcsh:Water supply for domestic and industrial purposes lcsh:TC1-978 Streamflow numerical simulation Environmental science Stage (hydrology) Groundwater Water Science and Technology |
| Zdroj: | Water Volume 12 Issue 7 Water, Vol 12, Iss 1922, p 1922 (2020) |
| ISSN: | 2073-4441 |
| DOI: | 10.3390/w12071922 |
| Popis: | Floodplain wetlands are of great importance in the entire river and floodplain ecosystems. Understanding the hydrological processes of floodplain wetlands is fundamental to study the changes in wetlands caused by climate change and human activities. In this study, floodplain wetlands along the middle reach of the Yellow River were selected as a study area. The hydrological processes and the interactions between the river and the underlying aquifer were investigated by combining remote sensing, hydraulic monitoring, and numerical modeling. Wetland areas from 2014 to 2019 were extracted from Landsat 8 remote sensing images, and their correlation with the river runoff was analyzed. The results indicate that the river flow had a limited impact on the wetland size and so did groundwater levels, due to the strong reliance of wetland vegetation on water levels. Based on hydrological and hydrogeological conditions, a surface water&ndash groundwater coupled numerical model was established. The comparison and correlation analysis between the monitored groundwater head and the simulated river stage also show that river flow did not play a first-order role in controlling the groundwater levels of wetlands in the study area. The simulation results also suggest that it is the regional groundwater flow that mainly sustains shallow groundwater of floodplain wetlands in the study area. The floodplain wetland of the study area was dynamic zones between the regional groundwater and river, the contrasting pattern of hydrological regimes on both banks of the Yellow River was due to a combination of regional groundwater flow and topography. |
| Databáze: | OpenAIRE |
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