Debris flows and debris torrents in the Southern Canadian Cordillera
Debris flows and debris torrents in the Southern Canadian Cordillera
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DOI：
10.1139/t85-006
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发表时间：
1985-02
影响因子：
3.6
通讯作者：
D. Vandine
中科院分区：
文献类型：
--
作者：
D. Vandine
在加拿大，不列颠哥伦比亚省、阿尔伯塔和育空地区的部分地区发生泥石流（也称为沟道化泥石流）。这一自然灾害造成至少17人死亡，桥梁和财产损失估计为1亿美元。这些碎片主要包括大圆石、岩石碎片、砾石到粘土大小的物质、树木和树木覆盖物----这些物质堆积在山涧中。为了容易受到碎片洪流的影响，小溪必须有一个临界范围内的排水面积，一个足够陡峭的剖面，碎片的积累，以及某种形式的触发机制。最常见的触发机制是一个极端的水排放，这可能是由于一个非常强烈的降雨或临时筑坝的小溪。在加拿大西部，由此产生的山洪涉及大量的碎片，通常小于50 000立方米，以3至12米/秒的速度沿着小溪流下。
In Canada, debris torrents (also referred to as channelized debris flows) occur in parts of British Columbia, Alberta, and the Yukon. At least 17 deaths and an estimated $100 million of damage to bridges and property can be attributed to this natural hazard. The debris mainly comprises large boulders, rock fragments, gravel- to clay-sized material, tree and wood mulch—materials that accumulate in the mountain creeks. To be susceptible to a debris torrent, a creek must have a drainage area within a critical range, a profile that is sufficiently steep, an accumulation of debris, and some form of triggering mechanism. The most common triggering mechanism is an extreme water discharge, which may result from a very intense rainfall or a temporary damming of the creek. In western Canada, the resulting torrents involve masses of debris, typically less than 50 000 m3, that travel down creeks at speeds between 3 and 12 m/s.Several passive and active forms of mitigation can be used to reduce the impact of debris to...