Transactions of The Japanese Society of Irrigation, Drainage and Reclamation Engineering
Online ISSN : 1884-7234
Print ISSN : 0387-2335
ISSN-L : 0387-2335
Erodibility of Kuroboku Soil by a Thin Film Flow
Katsutoshi TAKUMAHiroshi KOUNO
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1982 Volume 1982 Issue 100 Pages 22-27,a1


Erosion of Kuroboku soil by a thin film flow is a complex process. Soil erosion is comprised of four component processes. It is important to analyze separately each component process of the erosion by water. The major objective of the research reported in this paper was to study basic relationships between soil erosion from a thin film flow and the most important factors affecting it and to develop a soil loss prediction equation.
The following results were obtained:
1. The soil loss was linearly related to the sand content.
2. The dimensionless form on the rates of erosion of Kuroboku soil by a thin film flow was proposed.
3. It was found that the boundary shear stress, velocity of flow, average diameter of soil and water depth were the most important parameters to be used in soil erosion by a thin film flow. The prediction equation developed from the regression of data was:
The multiple-correlation coefficient for the above equation was O.964.
4. The boundary shear stress alone explained 76 percent of the variations regarding soil loss.
5. Velocity of flow can be predicted in terms of runoff rate excess, slope length and slope steepness.

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