Influence of Soil Properties on Water and Sediment Transport During the Revegetation: A Case Study at a Small Catchment in the Loess Plateau
Abstract
The soil physical properties changed a lot with the change of environment during the 'Green and Grain' project. They played critical roles in controlling water and sediment loss in Loess Plateau. However, the influence of each factor was hard to be monitored individually, and the field monitoring or experiments focused more on the slope scale but not the catchment scale. The objectives of this study were to better understand how the changes in each soil physical property influenced the hydrologic response and sediment transport at a small catchment in Loess Plateau. Hence, the sensitivity analyses of three main soil physical properties were conducted with a hydrologic-sediment transport coupling model. The corresponding variations of runoff and sediment yields, the erosion or deposition in the channel could be captured during the sensitivity analyses. The results revealed that the change of soil physical properties caused by human activities could influence the water and sediment transport. The growth of saturated hydraulic conductivity (K) could effectively reduce the peak and total flow, and even implied the possible transition of runoff generation mechanism. The increase of Manning's roughness coefficient (n) played a major role in flood detention, and the variations of erodibility coefficient (φ) could change the channel topography during the long term of erosion and deposition. Our results will be helpful in providing valuable reference information about the impacts of each soil physical property on runoff and sediment yields with the aim of improving the function of revegetation, and provide insights to the research in the future.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2018
- Bibcode:
- 2018AGUFM.H33N2276H
- Keywords:
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- 1807 Climate impacts;
- HYDROLOGYDE: 1834 Human impacts;
- HYDROLOGYDE: 1847 Modeling;
- HYDROLOGYDE: 1873 Uncertainty assessment;
- HYDROLOGY