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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Laboratory simulation of clast abrasion
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Laboratory simulation of clast abrasion

机译：劈裂磨损的实验室模拟

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摘要

Experimental abrasion of river-bed materials has been widely undertaken, producing 'downstream' fining rates that generally are believed to be much less than those observed in the field. A conclusion commonly adopted has been that sorting processes are more effective than abrasion processes. A comparative evaluation of results from an abrasion tank and a tumbling barrel are presented, which show that abrasion patterns and rates differ according to the equipment used, clast size and shape, the clast charge (barrel) and water velocity and bed material (tank). Abrasion is a composite process, and the effects achieved appear to be dominated by percussion in the tank and grinding in the barrel. Breakage, crushing and sandblasting are not modelled effectively, nor are effects achieved on clasts when they form part of the bed. Comparisons are made with other equipment used, the very limited amount of direct field abrasion monitoring, and with the probable suite of processes that may occur under field conditions. Also reviewed are the problems that arise when laboratory weight-loss abrasion coefficients are used or converted into ones of size diminution, as usually derived from field observations of down-channel trends. It is concluded that field abrasion rates generally have been underestimated, as the processes involved are at best only selectively represented by the experimental equipment so far used, and because the results obtained experimentally are capable of misinterpretation when related to field trends.
机译：已广泛进行了河床材料的实验性磨蚀，产生了“下游”精炼速率，通常认为该速率远低于现场观测的速率。通常得出的结论是，分选过程比磨损过程更有效。给出了对磨料桶和翻滚桶的结果的比较评估，结果表明，磨料的类型和速率因所使用的设备，碎屑的大小和形状，碎屑的装料量（桶），水速和床料（罐）而异。 。磨耗是一个复合过程，所产生的效果似乎由罐内的撞击声和桶内的研磨声主导。破裂，压碎和喷砂没有得到有效建模，当碎屑形成床的一部分时，也无法获得有效的效果。与使用的其他设备，数量非常有限的直接现场磨损监测以及可能在现场条件下发生的一系列过程进行了比较。还回顾了使用实验室减重损耗系数或将其换算成尺寸减小值时通常会从下行通道趋势的现场观察中得出的问题。结论是，现场磨损率通常被低估了，因为所涉及的过程最多只能由迄今为止使用的实验设备选择性地代表，并且因为通过实验获得的结果在与现场趋势相关时能够被误解。

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