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以黄土丘陵区桥沟小流域为研究对象,利用该流域不同地貌部位的野外径流场及沟道水文站网观测资料,探讨了小流域次暴雨泥沙输移比的时空变化特征。依据相关分析法,确定了影响桥沟流域次降雨泥沙输移比的主导因素。结果表明,径流侵蚀力、泥沙相对重率、降雨特性、土壤前期含水量是影响桥沟流域次降雨泥沙输移比的主导因子。采用统计回归方法,建立了黄土丘陵区桥沟流域次降雨泥沙输移比模型。
Taking the Qiaogou small watershed in the loess hilly region as the research object, the temporal and spatial variation characteristics of the sediment transport ratio of the sub-heavy rainstorm in the small watershed were studied by using the field runoff fields and the channel hydrological station network observation data of different landforms in the basin. Based on the correlation analysis method, the dominant factors that affect the sediment transport ratio of secondary rainfall in Qiaogou watershed were determined. The results show that runoff erosivity, relative rate of sediment, rainfall characteristics and pre-soil water content are the main factors affecting the sediment transport ratio of the secondary rainfall in the Qiaogou watershed. Using statistical regression method, the model of secondary rainfall-sediment transport ratio was established in Qiaogou watershed in loess hilly region.