[1]LI Xiaozheng,REN Zongping,ZHANG Xiaoming,et al.Identification of Sediment Sources Based on Grain Size of Soil[J].Research of Soil and Water Conservation,2023,30(04):34-41.[doi:10.13869/j.cnki.rswc.2023.04.041.]
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Identification of Sediment Sources Based on Grain Size of Soil
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
30
Number of periods:
2023 04
Page number:
34-41
Column:
Public date:
2023-06-10
- Title:
- Identification of Sediment Sources Based on Grain Size of Soil
- Keywords:
- sand-covered slope; simulated rainfall; sediment source; grain size
- CLC:
- S157.1
- DOI:
- 10.13869/j.cnki.rswc.2023.04.041.
- Abstract:
- [Objective] The research aims to reveal the influence of wind action on water erosion in the wind-water composite erosion area of the Loess Plateau, provide an effective method support for the identification of erosion material sources with different sediment particle sizes, and a theoretical reference for the identification of erosion sediment sources in the wind-water composite erosion area. [Methods] The wind erosion products were simulated by sand covering. Based on the indoor simulation experiment, the development characteristics of slope erosion after sand covering were studied, and in order to effectively distinguish the sources of erosion materials at different times, the sediment particle size was used as a fingerprint factor to identify the contribution of erosion sediment sources. [Results] Three fingerprint factors of different sediment particle size groups(particle size range: 26.303～34.674 μm, 104.713～138.038 μm, 138.038～181.970 μm)were identified as the best fingerprint factors by testing. Based on the best fingerprint factors, the average sediment contribution rates of the sand-covered layer and the loess layer were 48.2% and 51.8%, 24.8% and 75.2%, 6.8% and 93.2%, respectively, and the MAF was greater than 0. 8 in the three stages of simulated rainfall experiments in the same soil bin. The contribution rate of sediment in the sand-covered layer was in the order: the first stage test > the second stage test > the third stage test, and the calculation results were consistent with the DEM. [Conclusion] Different sediment particle size groups in sediment source area and erosion sediment can be used as fingerprint factors to identify sediment sources, and the composite fingerprint method has good applicability.
- References:
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Last Update:
2023-06-10