SEDIMENT CONCENTRATIONS RESULTING FROM FLOW DEPTH/DROP SIZE INTERACTIONS IN SHALLOW OVERLAND FLOW
SEDIMENT CONCENTRATIONS RESULTING FROM FLOW DEPTH/DROP SIZE INTERACTIONS IN SHALLOW OVERLAND FLOW
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DOI：
10.13031/2013.28440
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发表时间：
1993
影响因子：
1.5
通讯作者：
P. Kinnell
中科院分区：
文献类型：
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作者：
P. Kinnell
浅流条件下，水流深度影响雨滴冲击地表所施加的侵蚀应力。对实验室实验数据的分析表明，当地表对侵蚀的敏感性保持不变时，在两种情况下，与给定大小的水滴有关的沉积物浓度随水流深度呈指数下降。在第一种情况下，雨滴的大小没有显著的影响，因为河床上方水面的高度限制了颗粒在水流中被提升的高度。在第二种情况下，当水流深度超过随冲击液滴能量变化的临界深度时，从输沙角度来看，液滴大小和速度影响沉积物浓度。当雨滴冲击是侵蚀过程中的主导力量时，在设计评估土壤对侵蚀敏感性的实验中需要考虑这些影响。在设计用于预测雨滴侵蚀的模型时，也需要考虑这些因素。
Flow depth influences the erosive stress applied by raindrop impact to the surface under shallow flow. An analysis of data from laboratory experiments shows the sediment concentration associated with drops of a given size to decrease exponentially with flow depth within two regimes when the susceptibility of the surface to erosion remains constant. In the first regime, raindrop size has a non-significant effect because the height of the water surface above the bed constrains the height to which particles are lifted in the flow. In the second regime, which occurs when flows are deeper than a critical depth that varies with the energy of the impacting drops, drop size and velocity influence sediment concentration from the sediment transport perspective. These effects need to be considered in experiments designed to evaluate the susceptibility of soil to erosion when raindrop impact is a dominant force in the erosion process. They also need to be considered in models designed to predict raindrop-driven erosion.