GUESS Model Of Soil Erosion Analysis

The GUESS model for soil erosion, which was developed by Rose et al. (1983) illustrated the processes of soil erosion, transportation and deposition along hillside. Therefore the model can be used to predict on- and off-site effects. Soil erosion at any position on the slope and at any time during the storm is related to a sediment flux. It depends on the sediment concentration and the hydrological conditions.

This model is designed as a guide to farmers, scientists and other workers relevant with the evaluation and control of soil erosion by water.

Concept of the model

The concept of the model is to use the equilibrium of sediment in the area. It calculates the movement of sediment for each rainfall event by considering both the transport and deposition of the sediments

The sediment flux in the rill can then be multiplied by the number of rills to give the total sediment flux for the slope.

While it is possible for the actual sediment concentration (C) in the flow to equal Cmax, it is usually lower than Cmax by an amount depending on the strength of the soil matrix (β). The erodibility parameter (β) can be defined from the relationship,

C= Cβmax

β can be evaluated from,

β=