Evaluating Shallow Overland Flow Sediment Transport Capacity Model

Rudra, R. P.; Guy, B. T.; Dickinson, W. T.; Sohrabi, Teymour

doi:10.13031/2013.22998

Cited by 1 publication

(3 citation statements)

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“…Table 2 provides the equations for the relationships between the detachment rate and slope at the different rainfall intensities, with R 2 values ranging from 0.08~0. 94.…”

Section: Discussionmentioning

confidence: 99%

“…In terms of the relationship between transport and rainfall intensity, the squared value of the rainfall intensity can reasonably describe the variation in the transport rate [36,37]. However, the rainfall intensity exponent in the model developed by some authors is 0.99 [94], which is almost half the value of the previously developed model [36,37]. The transport of soil par- 14)-( 16)).…”

Section: Splash Transport Equationmentioning

confidence: 94%

“…Regarding the relationship between splash transport and slope, several scholars have proposed slope exponents ranging from 1.0 to 2.0 [91], while others have obtained slope exponents of 0.75 and 1.37 [92,93]. Another model was developed with an exponent for the slope of 0.865 [36], which was modified to 1.13 [94]; this value is very close to the slope index value in Equation (17). In terms of the relationship between transport and rainfall intensity, the squared value of the rainfall intensity can reasonably describe the variation in the transport rate [36,37].…”

Section: Splash Transport Equationmentioning

confidence: 99%

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Impacts of Rainfall Characteristics and Slope on Splash Detachment and Transport of Loess Soil

Liu,

Du,

Cheng

et al. 2024

Land

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To identify the key parameters and develop accurate experimental models of detachment and transport, splash detachment and transport of loess soil were investigated in relation to the rainfall characteristics and slope. The experiment was conducted under 25 combinations of five rainfall intensities (60, 84, 108, 132 and 156 mm h−1) and five slope gradients (0°, 5°, 10°, 15° and 20°), using a custom splash pan. Raindrop characteristics (diameter, velocity and kinetics) and splash mass were measured in downslope and upslope. The results indicated that rainfall intensity and slope contributed 94.77% and 0.46%, respectively, to the detachment rate, and 24.39% and 67.82%, respectively, to the transport rate. From a holistic viewpoint, the positive effect of slope became more visible on the detachment rate when the rainfall intensity exceeded 108 mm h−1, and on the transport rate when the slope exceeded 15°. Based on the rainfall simulator in this study, the rainfall kinetic energy (KE, J), raindrop median particle size (D50, mm) and raindrop terminal velocity (V, m s−1) all increased with increasing rainfall intensity (I) within the 60~108 mm h−1 range but decreased with increasing rainfall intensity within the 132~156 mm h−1 range. The rainfall intensity and raindrop characteristics (D50/V/KE) are the key parameters of splash detachment (Dr, g·m−2 min−1), and three detachment models were developed: (1) Dr = 0.1153 I1.09D500.79 (R2 = 0.99, NSE = 0.98, p < 0.01); (2) Dr = 0.0162 I1.11V1.22 (R2 = 0.99, NSE = 0.99, p < 0.01); and (3) Dr = 0.0813 I1.10KE0.18 (R2 = 0.99, NSE = 0.99, p < 0.01). The rainfall intensity and slope are the key parameters for splash transport (Tr, g·m−2 min−1), and the developed transport models could be expressed as: (1) Tr = 0.00657 I1.343S0.116 (R2 = 0.914, NSE = 0.874, p < 0.01) (slopes of 0°, 5° and 10°) and (2) Tr = 0.00218 I1.165S1.033 (R2 = 0.986, NSE = 0.986, p < 0.01) (slopes of 15° and 20°). The results of this study could enhance the understanding of soil splash detachment and transport on loess slopes.

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“…Table 2 provides the equations for the relationships between the detachment rate and slope at the different rainfall intensities, with R 2 values ranging from 0.08~0. 94.…”

Section: Discussionmentioning

confidence: 99%