NDLI: Comparison and validation of the ratio of Manning coefficient to flow depth for soil erosion prediction using published data with different external impacts

Content Provider	Springer Nature Link
Author	Li, Tianyang Liang, Chuan Zhang, Yi Zhao, Peng
Copyright Year	2017
Abstract	Soil erosion leads to non-point pollution and thus water eutrophication; however, the soil erosion rate remains poorly predictable. Hydraulic parameters are essential parts of soil erosion prediction models, and proper parameters can improve the model accuracy. The ratio of Manning roughness coefficient to flow depth (n/h) is proposed as an effective parameter for predicting soil erosion, but more evidences are needed to validate the applicability of n/h.The published data from four experiments performed with laboratory artificial rainfall and field simulation scouring were collected. The hydraulic parameters, including Manning roughness coefficient (n), Reynolds number (Re), Froude number (Fr), shear stress (τ), stream power (w), unit stream power (P) and unit flow energy (E), and sediment yield rate (SY) were calculated to further analyze their relationships and n/h ratio under different external impacts.The n/h ratio representing both the soil and flow character was better than n when the relationships were developed with hydraulic parameters such as Re, Fr, τ, w, P, and E. The sediment yield rate (SY) showed better relationships with n/h, w, P, and E than τ, as the expressions of w, P, and E could be described by the n/h, respectively.The results indicated that the n/h ratio could explain hydraulics and soil erosion though the external impacts were quite different. The results provided further information for understanding the relationship between hydraulics and soil erosion and verifying the applicability of n/h in soil erosion prediction.
Starting Page	1682
Ending Page	1695
Page Count	14
File Format	PDF
ISSN	14390108
Journal	Journal of Soils and Sediments
Volume Number	17
Issue Number	6
e-ISSN	16147480
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2017-01-05
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Flow depth Hydraulic parameters Manning roughness coefficient Sediment yield Soil erosion Soil Science & Conservation Environment Environmental Physics
Content Type	Text
Resource Type	Article
Subject	Stratigraphy Earth-Surface Processes

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