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stems give a good bondage. Trees growing in a close wood serve both as a good bondage and as an indication that avalanches have not recently swept through the region. Avalanches can fall, however, from a sparsely wooded slope, and even dense woods are sometimes swept out by avalanches starting above the wood. Water-saturated soil is obviously a slippery surface. It should be borne in mind that the ground surface and vegetation affect only the snow layers into which they protrude. After the ground and vegetation is completely covered and a smooth snow slope is formed, each succeeding snow layer must be bonded to lower layers in order to obtain any support from the original surface. |
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