Study on Relation of Erosion and Sediment Yield in the Watershed System

摘要

Based on the observation data of erosion and sediment yield in the Dalihe Watershed, a important branch of Yellow River, the conclusion is brought forward that the erosion and sediment yield in the watershed system in a long-term time can reach balance, the sediment delivery ratio is approximate equal to 1; However, a great alteration range still exist in a short-term time like a different rainfall or a particular year, the sediment delivery ratio can reach more than 1 or less than 1 because the sediment in the watershed can be delayed or be transported again by runoff erosion. Sediment delivery ratio is close with runoff deep ratio, rainfall distributing and flood peak amplitude ratio in the watershed system. The characteristics of space-time distributing of delivery ratio in the various scales watershed and the influence factors to the delivery ratio in watershed systems are illustrated and some relative models are built in this paper.