摘要
利用野外试验小区观测与人工模拟降雨资料,在定量分析羊道沟小流域坡面—沟坡—沟道侵蚀产沙关系基础上,建立了羊道沟小流域侵蚀产沙模型。借助GIS技术,将王家沟小流域划分为40个沟间地、40个沟坡地及它们组成的40个子流域和一个输水输沙通道。通过对比分析每个子流域降雨、地貌、治理、植被覆盖、耕作措施和土壤6个主要侵蚀产沙影响因子与羊道沟小流域各因子的关系,得到王家沟各子流域相对于羊道沟小流域侵蚀产沙模型相应参数的修正系数,结合王家沟流域主沟道泥沙输移关系,建立了王家沟流域次降雨分布式侵蚀产沙模型。利用王家沟流域1963—1968年22次天然降雨资料,对模型进行检验,结果较为理想,预测精度达到55%。
According to field observations and simulated rainfall data in Yangdaogou Catchment, the relationship between the runoff and sediment yield on the hill slope and gully was analyzed, and then the Yangdaogou soil erosion model was established. With GIS, 40 hill slopes, 40 gullies, and 40 sub-geomorphic units were obtained though dividing Wangjiagou Catchment. After comparison the six main factors that influencing soil erosion, including rainfall, relief, vegetation coverage, tillage measures, control measures, and soil in the context of spatial scale, in Yangdaogou Catchment and other sub catchments of Wangjiagou, the calibrating indexes was obtained. Combined with the Sediment delivery ratio of the main gully of Wangjiagou, a distributed soil erosion model for single storms based on GIS was established. The model was validated by the 22 natural rainfall data from 1963 to 1968 in the Wangjiagou Catchment, the prediction precision of the model is reached 55 %.
出处
《中国水土保持科学》
CSCD
2008年第5期21-26,共6页
Science of Soil and Water Conservation
基金
国家自然科学基金"黄土区多尺度小流域土壤侵蚀动态过程模拟研究"(4063507)
