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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Tools and cover effects in bedload transport observations in the Pitzbach, Austria
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Tools and cover effects in bedload transport observations in the Pitzbach, Austria

机译：奥地利皮茨巴赫的床荷运输观测中的工具和掩盖效应

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We report bedload data and acoustic impulse measurements due to particle impact from the Pitzbach in Austria. Impulse counts can be viewed as a measure of the energy delivered to the bed by moving particles. Impulse counts show a large scatter even for the same discharge and bedload supply. This scatter is due to varying grain size distribution, grain shape, mode of transport of the sediment particles and spatial and temporal distribution of the sediment load. The mean impulse Count at given hydraulic conditions may increase or decrease with increasing sediment supply, suggesting that both tools and cover effects are active on the channel bed. Dependent on the local balance between sediment supply and transport capacity, either effect may be dominant at different locations along the cross-section at the same time. Furthermore, the same bed location may respond to increasing sediment supply as tools-dominated at some discharges and cover-dominated at other discharges. Our observations may have implications for modelling of bedrock erosion in landscape evolution models and of bedrock channel morphology. Erosion models that do not incorporate both tools and cover effects are not sufficient to describe observations. Furthermore, a local erosion law cannot in general be used to describe erosion averaged over the channel cross-section. The changing balance between sediment supply and transport capacity with increasing discharge highlights that a single representative discharge is not sufficient to capture the full erosion dynamics. Copyright (C) 2008 John Wiley and Sons, Ltd.
机译：我们报告了由于奥地利Pitzbach受到粒子撞击而产生的床载数据和声脉冲测量结果。脉冲计数可以看作是通过移动粒子传递到床的能量的量度。即使对于相同的流量和床载量，脉冲计数也显示出较大的分散性。这种分散是由于颗粒大小分布，颗粒形状，沉积物颗粒的运输方式以及沉积物负荷的时空分布变化而引起的。在给定的水力条件下，平均冲动数可能会随着沉积物供应的增加而增加或减少，这表明工具和覆盖作用都在河床上起作用。取决于沉积物供应和输送能力之间的局部平衡，这两种效应可能同时在横截面上的不同位置占主导地位。此外，同一床位置可能对沉积物供应增加做出响应，因为在某些排放处工具占主导地位，而在其他排放处以覆盖物为主。我们的观察结果可能会对景观演化模型中的基岩侵蚀建模和基岩河道形态产生影响。没有同时包含工具和覆盖效果的侵蚀模型不足以描述观测结果。此外，一般不能使用局部腐蚀定律来描述整个河道断面的平均腐蚀。随着排放量的增加，沉积物供应量和运输量之间的平衡变化突显出，单一的代表性排放量不足以捕获全部侵蚀动态。版权所有（C）2008 John Wiley and Sons，Ltd.

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