EXPERIMENTAL ABRASION 4 - EOLIAN ACTION
EXPERIMENTAL ABRASION 4 - EOLIAN ACTION
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DOI：
10.1086/626675
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发表时间：
1960-01-01
影响因子：
1.8
通讯作者：
KUENEN, PH
中科院分区：
文献类型：
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作者：
KUENEN, PH
在三种不同类型的风洞中研究了风沙流对磨损的影响。石灰石、长石和石英以立方体、碎晶体或天然颗粒的形状进行测试。磨损量随表面尺寸、风速、棱角度和粗糙度的增大而增大。抛光的中等大小的石英颗粒没有损失。在相同的距离上，石英的风力磨损比河流的机械作用有效100到1,000倍。但细石英砂的风蚀作用很小，在直径为0.05 mm时，风蚀作用几乎为零。在黄土中占主导地位的粒度范围内，没有石英颗粒产生。实验磨损的ventifacts表明，这些被削减缓慢几十年的中等强风，但在几天的风暴，和几个小时，如果切割砂是粗糙和角。这些结果必须看作是初步的近似，因为自然界中的许多因素不是未知的，就是在实验中无法重现的。关于结霜和结霜的实验将在别处进行。
Abrasion by eolian transport was studied in three different types of wind tunnel. Limestone, feldspar, and quartz were tested in the shape of cubes, crushed crystals, or natural grains. Abrasion increases with size, wind velocity, angularity and roughness of surface. Polished medium-sized quartz grains sustain no loss. Wind abrasion of quartz is 100 to 1,000 times more effective over the same distance than the mechanical action of a river. But eolian abrasion is slight for fine quartz sand and drops to zero at 0.05 mm. in diameter. No quartz particles are produced in the size range dominating in loess. Experimental abrasion of ventifacts indicates that these are cut slowly in scores of years by medium strong winds, but in a matter of days by storm winds, and in a matter of hours if the cutting sand is coarse and angular. These results must be looked upon as first approximations, for many factors in nature are either unknown or not reproduced in the experiments. Experiments on frosting and defrosting will be treated elsewhere.