...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >The impact of slope length on the discharge of sediment by rain impact induced saltation and suspension
【24h】

The impact of slope length on the discharge of sediment by rain impact induced saltation and suspension

机译：边坡长度对降雨影响的盐分和悬浮作用对沉积物排放的影响

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Simulations using a mechanistic model of raindrop driven erosion in rain-impacted flow were performed with particles travelling by suspension, raindrop induced saltation and flow driven saltation. Results generated by both a high intensity storm, and a less intense one, indicate that, because of the effect of flow depth on the delivery of raindrop energy to the bed, there is a decline in sediment concentration, and hence soil loss per unit area, with slope length when particles are transported by raindrop induced saltation. However, that decline is reversed when the critical velocities that lead to flow driven saltation are episodically exceeded during an event. The simulations were performed on smooth surfaces and a single drop size but the general relationships are likely to apply for rain made up of a wide range of drop size. Although runoff is not always produced uniformly, as a general rule, flow velocities increase with slope length so that, typically, the distance particles travel before being discharged during an event increase with slope length. The effect of slope length on soil loss per unit area is often considered to vary with slope length to a power greater than zero and less that 1.0. The simulations show that effect of slope length on sediment discharge is highly dependent on the variations in runoff response resulting from variations in rainfall duration-intensity-infiltration conditions rather than plot length per se. Consequently, predicting soil loss per unit area using slope length with positive powers close to zero when sheet erosion occurs may not be as effective as commonly expected. Erosion by rain-impacted flow is a complex process and that complexity needs to be considered when analysing the results of experiments associated with rain-impacted flow under both natural and artificial conditions.
机译：使用由悬浮，雨滴引起的盐分和水流引起的盐分运动的颗粒，使用雨滴驱动的侵蚀作用流中的侵蚀的机械模型进行了模拟。高强度暴风雨和低强度暴风雨所产生的结果表明，由于流量深度对降雨能量向河床的传递的影响，沉积物浓度下降，因此单位面积土壤流失，具有通过雨滴引起的盐分运输颗粒时的坡度长度。但是，当事件期间突然超过导致流动驱动盐化的临界速度时，这种下降将被逆转。模拟是在光滑的表面和单个液滴大小上进行的，但是一般关系很可能适用于由各种液滴大小组成的降雨。尽管并非总是均匀地产生径流，但是通常情况下，流速会随着坡度的增加而增加，因此，通常情况下，在事件过程中，粒子在被排放之前的行进距离会随着坡度的增加而增加。通常认为，边坡长度对单位面积土壤流失的影响会随着边坡长度的变化而变化，其幂值大于零且小于1.0。模拟表明，边坡长度对沉积物排放的影响高度依赖于降雨持续时间-强度-入渗条件的变化而不是地块长度本身所引起的径流响应变化。因此，当发生片层侵蚀时，使用正幂接近零的坡度长度预测单位面积的土壤流失可能不如通常预期的那样有效。受降雨影响的水流侵蚀是一个复杂的过程，在自然和人工条件下分析与降雨影响的水流相关的实验结果时，都需要考虑复杂性。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号