The Application of Unascertained Measurement Theory in Soil Erosion Severity Evaluation

Uncertained measurement theory and Analytic hierarchy process(AHP) methods were combined and applied to evaluate soil erosion severity. According to influence factors and grading standards of soil erosion severity, ten indicators, such as selected slope angle, rainfall intensity, soil properties, water erosion modulus, thickness of covering soil and permeability (particle size), etc, were used to evaluate soil erosion severity. Uncertained measurement functions of evaluation of soil erosion severity were obtained by using uncertainty measurement theory. AHP was used to calculate weights of the evaluation indexes of soil erosion severity. Credible degree recognition criteria was used to evaluate hazard assessment of debris flow. Finally, the comparative analysis was made with examples. The results showed that uncertained measurement theory is reasonable and reliable. It was the first time that the AHP and uncertained measurement theory was applied to the severity of soil erosion assessment, which provided a new analysis method for the study of the soil and water loss danger division.