A GIS-based method to determine the volume of lahars: Popocatépetl volcano, Mexico
A GIS-based method to determine the volume of lahars: Popocatépetl volcano, Mexico
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DOI：
10.1016/j.geomorph.2008.09.028
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发表时间：
2009-10
期刊：
影响因子：
3.9
通讯作者：
E. Muñoz-Salinas;C. Renschler;D. Palacios
中科院分区：
文献类型：
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作者：
E. Muñoz-Salinas;C. Renschler;D. Palacios
火山泥流是由水和火山沉积物组成的流动，对生活在火山附近的人们来说往往是危险的。因此，需要对拉哈尔体积进行可靠的估计，以有效地评估风险。本文提出了一种新的方法来计算发现在火山景观通道的拉哈尔沉积物的体积。该方法需要沿着峡谷的几个横截面的调查，研究区域的数字高程模型和拉哈尔沉积物厚度的测量。利用这些数据和地理信息系统（GIS），计算了将存款体积划分为斜平行六面体的侵蚀剖面和将存款体积划分为多面体的沉积剖面的体积。这种新方法被应用于1997年和2001年发生在墨西哥波波卡特佩特火山峡谷通道的火山泥流。计算结果分别为1.85× 105m3和1.6×105m3，比传统的拉哈尔流径长度、沉积物宽度和沉积物深度的乘积法计算结果减少约40%。这一观察结果表明，传统方法往往高估了数量。
Lahars are flows composed of water and volcanic sediment which are often dangerous for people living near volcanoes. Therefore, a reliable estimation of lahar volume is needed to effectively assess the risk. This paper proposes a new method to calculate the volume of lahar sediments found in channels of volcanic landscapes. The method requires surveys of several cross-sections along a gorge, a Digital Elevation Model of the study area and measurements of the thickness of the lahar deposits. With these data and a Geographical Information System (GIS), the volume is calculated for the erosive section where deposit volume is divided into oblique parallelepipeds and the sedimentary section where deposit volume is divided into polyhedrons. This new method was applied to the 1997 and 2001 lahars that occurred in the channel of a gorge at Popocatépetl volcano, Mexico. The estimated volumes are 1.85×105and 1.6×105m3, respectively, which is about 40% less than those obtained by the traditional method that multiplies lahar flow-path length, sediment width and sediment depth. This observation suggests that the traditional method tends to overestimate volumes.