Drop shape and erosivity. Part II: Splash detachment, splash transport and erosivity indices
Drop shape and erosivity. Part II: Splash detachment, splash transport and erosivity indices
复制标题
DOI：
10.1002/esp.3290100109
复制
发表时间：
1985
影响因子：
3.3
通讯作者：
H. Riezebos;G. Epema
中科院分区：
文献类型：
--
作者：
H. Riezebos;G. Epema
针对液滴尺寸和落下高度的不同组合，测试了液滴形状与侵蚀性的相关性。对于所有测试组合，在侵蚀性参数中引入观察到的液滴形状仅对侵蚀性与飞溅分离和传输之间的关系产生微小的改善。这一结果归因于高速条件下扁圆形状的主导地位。在许多降雨模拟器和跌落测试中使用较小的跌落高度和较低的跌落速度，结果表明，扁长形跌落产生的飞溅脱离比扁圆形跌落在撞击时产生的飞溅脱离高出 2 至 3 倍。由于降雨器或骨料稳定性跌落测试中的跌落产生可能会或多或少地导致跌落形状的不受控制的变化，因此得出的结论是，除了其他测试条件之外，还应指定跌落形状。此外，值得注意的是，长长形水滴的侵蚀能力可以部分解释植被下方的高飞溅侵蚀量。
The relevance of drop shape for erosivity was tested for different combinations of drop sizes and fall heights. For all test combinations together the introduction of the observed drop shape in erosivity parameters only produces minor improvements in the relation between erosivity and detachment and transport by splash. This result is attributed to the dominance of oblate shapes in high velocity conditions. Using small fall heights and low fall velocities as in many rainfall simulators and drop tests it is shown that prolate drops produce a splash detachment which is 2 to 3 times higher than that produced by drops with an oblate shape at impact. As drop production in rainulators or for aggregate stability drop tests may result in more or less uncontrolled variations of drop shape, it is concluded that in addition to other test conditions drop shape should be specified. Moreover it is noted that the erosive capability of prolate drops can explain partly the high splash erosion amounts below vegetation.