Abstract
A soil erodibility parameter of a soil erosion model is an important factor for predicting the erosion and sediment yield in sloping fields with a ridge-furrow system. Exact prediction of the soil erosion and sediment yield requires a mehod for determining a suitable value of the parameter. However, only a few of effective experimental methods for determining the parameter has been developed. In this study, flow tests were run in furrow channels within a field to develop a simple method of determining the soil erodibility parameter a in a erosion model, E=aQbSc (E: rill erosion rate, Q: discharge, S: slope, b, c: power coefficients). The results of the experiments indicate that the measurements of sediment runoff rate by flow tests in furrow channels and analyses by using the erosion model can determine a suitable soil erodibility parameter.
