[1]ZHANG Minghao,ZHANG Xin,WANG Tianhong,et al.Method of Determining Hydrological Response Units for Discretization of Microtopography[J].Research of Soil and Water Conservation,2022,29(01):86-91+99.
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Method of Determining Hydrological Response Units for Discretization of Microtopography
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
29
Number of periods:
2022 01
Page number:
86-91+99
Column:
Public date:
2022-02-20
- Title:
- Method of Determining Hydrological Response Units for Discretization of Microtopography
- Keywords:
- spatial discretization; hydrological response unit; CA; microtopography; slope water erosion
- CLC:
- S157
- DOI:
- -
- Abstract:
- Spatial discretization is a necessary and sufficient condition for the construction of distributed hydrological models. Based on the 90 mm/h rain intensity artificial rainfall test and three-dimensional laser scanning to construct the digital elevation model of micro-topography(M-DEM), and the cellular automata(CA)model, the water-sediment collection and transfer relationship of different size grids/cells in the process of erosion development in the artificially excavated micro-topography on 5 different types of slopes were studied, and then a method for determining spatial discretization hydrological response unit(HRU)was proposed. The results show that the optimal HRU sizes for the 5°, 10°, 15°, 20° and 25° slopes determined by the CA model in the splash phase are 6 mm, 5 mm, 6 mm, 5 mm, 8 mm; the best HRU sizes at the sheet corrosion stage are 6 mm, 4 mm, 6 mm, 5 mm, 5 mm; the best HRU sizes for the rill erosion stage are 4 mm, 7 mm, 5 mm, 6 mm, 6 mm; the Nash efficiency coefficients are all close to 1. Comprehensively above, the best HRU for water erosion simulation of artificially excavated micro-terrain should be 6 mm under the rainfall intensity of 90 mm/h. This study puts forward a method for the spatial discretization of micro-topography, which can provide certain technical support for the quantitative study of water erosion at the micro-topography scale.
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Last Update:
2022-02-20