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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Analysing the relation between rainfall characteristics and lahar activity at Mount Pinatubo, Philippines
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Analysing the relation between rainfall characteristics and lahar activity at Mount Pinatubo, Philippines

机译：分析菲律宾皮纳图博火山的降雨特征与拉哈活动之间的关系

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The eruption of Mount Pinatubo in June 1991 altered the conditions of the surrounding river catchments. Pyroclastic flows and tephra fall were deposited over extensive areas, stripping off the forest cover and burying drainage divides. These recent deposits are very loosely consolidated and generally consist of sand-sized particles, which commonly mobilize into lahars in response to rainfall of a certain magnitude. Several devastating lahar occurrences have buried settlements covering tens to several hundred square kilometres in a single event. Correlation of storm rainfall intensities and durations with lahar activity as recorded by acoustic flow monitors is used to investigate trends in the initiation conditions for lahar activity. This research confirms that the relationships of rainfall intensity and duration with lahar initiation threshold values are not linear but rather approximate a power relation. Different relations were found for lahar initiation in different years, from 1991 to 1997, as a result of the dynamic changes in hydrologic and geomorphic conditions of the affected catchments. Data from acoustic flow monitors are used to distinguish debris flow and hyperconcentrated flow activity from that of muddy water. Copyright (c) 2005 John Wiley & Sons, Ltd.
机译：1991年6月的皮纳图博火山爆发改变了周围河流集水区的条件。火山碎屑流和特非拉瀑布沉积在广阔的区域，剥去了森林覆盖物并掩埋了排水沟。这些最近的沉积物非常松散地固结，通常由沙粒大小的颗粒组成，它们通常会响应一定量的降雨而迁移到拉哈尔。几次毁灭性的拉哈事件在一次事件中掩埋了数十至数百平方公里的定居点。由声流监测仪记录的风暴降雨强度和持续时间与拉哈活动的相关性用于调查拉哈活动起始条件的趋势。这项研究证实，降雨强度和持续时间与拉哈尔起始阈值之间的关系不是线性的，而是近似的幂关系。由于受灾流域水文和地貌条件的动态变化，在1991年至1997年的不同年份发现了不同的Lahar启动关系。来自声流监测器的数据用于区分泥石流和高浓度流活动与泥水活动。版权所有（c）2005 John Wiley＆Sons，Ltd.

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