| چکیده انگلیسی مقاله |
Subalpine meadow soil is widely distributed on the slope within the deep-cut valley area of eastern Tibetan plateau. Due to the specific structure of meadow soil and climatic conditions, rainfall amount effect can cause a large area of subalpine meadow soil erosion behaved with disintegration and shallow slide. This can cause terribly soil erosion and meadow degeneration, and is regarded as the typical ecologically vulnerable phenomena in eastern Tibetan plateau. Field prototype investigation revealed that the shallow slide erosion is principally driven by seepage pressure of the infiltrated rainwater and gravity pressure of saturated meadow soil. Based on the erosion mechanism, an Ad-TSMS model was established by coupling the hydrological model of TOPMODEL to the modified limit equilibrium slope stability model of TRIGRS. By comparison of the prediction result of the models and the catalog data of the erosion event investigated, Ad-TSMS predicted 60,085 more erosion spots than TRIGRS do with the same input parameters and computing time, and the Ad-TSMS model was proved 32.5% higher of the prediction accuracy than the TRIGRS model in the erosion area. Accurate prediction of shallow slide erosion of subalpine meadow soil can help establishing ecological management regulations, and has great theoretical and practical significance to conservation of soil and water on eastern Tibetan plateau. |
