Mechanisms of debris supply to steep channels along Howe Sound, southwest British Columbia
Mechanisms of debris supply to steep channels along Howe Sound, southwest British Columbia
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不列颠哥伦比亚省西南部豪湾沿岸陡峭水道的碎片供应机制
DOI：
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发表时间：
1987
期刊：
影响因子：
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通讯作者：
B. R. Dagg
中科院分区：
文献类型：
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作者：
M. Bovis;B. R. Dagg
在不列颠哥伦比亚省温哥华附近，形成豪湾峡湾东坡的山壁，被陡峭的小溪深深切割，在过去的二十年里，其中许多小溪产生了破坏性的泥石流。暴雨期间偶尔发生的高量级山洪，其重现期仅为2-3年，这一事实表明，在检验山洪发生时，除降雨径流外，还必须考虑沟道中泥石流的数量和稳定性，以及来自邻近斜坡的大冲击荷载。因此，研究重点是向渠道提供碎片和脉冲载荷的山坡过程，以及所涉及材料的特征。碎片供应检查选定的盆地分类为“岩坡为主”或“漂移为主”。对个别流域的详细研究应能比其他地区的降雨或径流模型更深入地了解这里泥石流的成因。
The mountain wall which forms the east slope of Howe Sound fjord, near Vancouver, B.C., is deeply dissected by steep creeks, many of which have produced destructive debris torrents over the past twenty years. The fact that high-magnitude torrents have occurred sporadically during rainstorms with only 2-3 year recur rence intervals suggests that, in addition to rainfall runoff, the quantity and stability of debris in the channels, together with large impulsive loads from adjacent slopes, must be taken into account when exam ining torrent occurrence. Accordingly, research has focussed on hillslope processes supplying debris and impulsive loads to the channels, and on the character of the materials involved. Debris supply is examined for selected basins classed as either 'rockslope-dominated' or 'drift-dominated'. Detailed studies of individual basins should provide more insight into the causes of debris torrents here than would rainfall- or runoff-based models derived in other regions.