Abstract
The impacts of irregular bedform in cross section on hyporheic exchange are studied by means of numerical simulation computations. The computation of the hyporheic exchange rate is done using the modular finite-difference ground-water flow model (MODFLOW) developed by the United States Geological Survey. Results show that more hyporheic exchange occurs on the part of the streambed in deeper-water areas. The bedform has less influence on the groundwater flow direction. However, the groundwater flow close to the streambed exhibits a strong velocity gradient due to terrain effects. The groundwater flow velocity in the deeper-water area is far greater than that in the shallower-water area. In comparison with the hydraulic conductivity and the water depth obtained from the field experiment, the heterogeneity in hydraulic conductivity in hyporheic zone is likely due to the effect of irregular bedform in cross section.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 789-795 |
| Number of pages | 7 |
| Journal | Shuikexue Jinzhan/Advances in Water Science |
| Volume | 23 |
| Issue number | 6 |
| State | Published - Nov 2012 |
| Externally published | Yes |
Keywords
- Bedform
- Heterogeneity
- Hydraulic conductivity
- Hyporheic exchange
- Numerical simulation
ASJC Scopus subject areas
- General Earth and Planetary Sciences