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Article

Runoff Characteristics and Soil Loss Mechanism in the Weathered Granite Area under Simulated Rainfall

by 1,2, 1,2, 1,2, 1,2, 1,2,*, 3 and 3
1
Institute of Soil and Water and Environmental Sciences, College of Environment and Resource Sciences, Zhejiang University, Hangzhou 310058, China
2
Zhejiang Provincial Key Laboratory of Agricultural Resources and Environment, Hangzhou 310058, China
3
Agricultural Experiment Station of Zhejiang University, Hangzhou 310058, China
*
Author to whom correspondence should be addressed.
Academic Editor: Tomáš Dostál
Water 2021, 13(23), 3453; https://doi.org/10.3390/w13233453
Received: 20 October 2021 / Revised: 2 December 2021 / Accepted: 2 December 2021 / Published: 5 December 2021
(This article belongs to the Special Issue Modelling of Soil Conservation, Soil Erosion and Sediment Transport)
Soils developed from the parent materials of highly weathered granite are particularly susceptible to soil erosion. Therefore, it is of great significance to conduct in-depth research on runoff characteristics and soil loss mechanisms in weathered granite areas. Using the weathered granite area in the hilly region of southeastern China as the research object, we conducted indoor artificial rainfall simulation experiments involving three slope steepnesses (SSs), 8°, 15°, and 25°, and five rainfall intensities (RIs), 0.5, 1.0, 1.5, 2.0, and 2.5 mm/min. The results showed that sediment load (SL) has positively linear relationships with mean runoff velocity (V), Reynolds number (Re), Froude number (Fr), shear stress (τ), and stream power (w). The eroded sediment was principally composed of silt and clay that accounted for 65.41–73.41% of the total SL. There was a boundary point at 0.02 mm for the particle size distribution (PSD) of the eroded sediment. The enrichment ratio (Er) of sand-grained particles (0.02–2 mm) ranged from approximately 0.45 to 0.65, while the Er of fine-grained particles (<0.02 mm) ranged from approximately 1.37 to 1.80. These results increase our understanding of the relationships among RI, SS, runoff, and soil losses from weathered granite hillslopes, particularly the relationships between different hydraulic parameters and sediment size characteristics. View Full-Text
Keywords: rainfall intensity; slope steepness; hydraulic parameter; eroded sediment; rainfall simulation rainfall intensity; slope steepness; hydraulic parameter; eroded sediment; rainfall simulation
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MDPI and ACS Style

Sun, T.; Deng, L.; Fei, K.; Fan, X.; Zhang, L.; Ni, L.; Sun, R. Runoff Characteristics and Soil Loss Mechanism in the Weathered Granite Area under Simulated Rainfall. Water 2021, 13, 3453. https://doi.org/10.3390/w13233453

AMA Style

Sun T, Deng L, Fei K, Fan X, Zhang L, Ni L, Sun R. Runoff Characteristics and Soil Loss Mechanism in the Weathered Granite Area under Simulated Rainfall. Water. 2021; 13(23):3453. https://doi.org/10.3390/w13233453

Chicago/Turabian Style

Sun, Tianyu, Longzhou Deng, Kai Fei, Xiaojuan Fan, Liping Zhang, Liang Ni, and Rui Sun. 2021. "Runoff Characteristics and Soil Loss Mechanism in the Weathered Granite Area under Simulated Rainfall" Water 13, no. 23: 3453. https://doi.org/10.3390/w13233453

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