Use of remote imagery to analyse changes in morphology and longitudinal large wood distribution in the blanco river after the 2008 chaitén volcanic eruption, southern chile
Use of remote imagery to analyse changes in morphology and longitudinal large wood distribution in the blanco river after the 2008 chaitén volcanic eruption, southern chile
复制标题
使用远程图像分析 2008 年智利南部 Chaitén 火山喷发后布兰科河形态变化和纵向大型木材分布
DOI：
10.1111/geoa.12091
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
L. Lara
中科院分区：
文献类型：
--
作者：
H. Ulloa;A. Iroumé;L. Mao;A. Andreoli;Silvia Diez;L. Lara
摘要 2008 年海腾火山喷发使希莱南部兰科伊河河流走廊沿线的河道形态和大量木材丰度发生了显着变化。对喷发前（2005年）和喷发后（2009年和2012年）遥感图像的比较表明，在10.2公里长的研究段中，兰科河从2005年到2009年扩大了3.5倍，最大扩大为原始宽度的9倍。 2012 年至 2009 年，河道宽度变化较小。2005 年至 2009 年，河道蜿蜒度和辫状指数也发生变化。喷发后，河道蜿蜒度较高，特定河段形成辫状格局，但到 2012 年，河道已恢复喷发前的特征。研究部分引入了大量的； 2005年和2009年每公里河道长度的个体数量分别为1.6和74.3个，2009年观察到超过30个日志堵塞km−1。2009年和2012年之间的数量非常相似。在原木堵塞的数量和河道蜿蜒度之间以及具有蜿蜒度的大木块的数量和河道宽度之间发现了统计学上显着的关系。木材在 2009 年至 2012 年间高度动态：到 2012 年，2009 年图像中识别出的 78% 的单块和 48% 的原木堵塞已发生移动。最后，测试了与 ArcMap 工具相关的图像监督分类，以识别大型木材。
Abstract The 2008 haitén volcanic eruption generated significant changes in the channel morphology and large wood () abundance along the fluvial corridor of the lanco iver, southern hile. Comparisons of remote sensing images from the pre‐eruption (year 2005) and post‐eruption (years 2009 and 2012) conditions showed that in a 10.2 km long study segment the lanco iver widened 3.5 times from 2005 to 2009, and that the maximum enlargement was nine times the original width. Changes in channel width were lower between the years 2012 and 2009. The sinuosity and braiding indexes also changed between 2005 and 2009. After the eruption the channel sinuosity was higher and specific river reaches developed a braided pattern, but by 2012 the channel was recovering pre‐eruption characteristics. Huge quantities of were introduced to the study segment; individual per km of channel length were 1.6 and 74.3 in 2005 and 2009, respectively, and more than 30 log jams km−1 were observed in the year 2009. Between 2009 and 2012 the quantity of was very similar. Statistically significant relationships were found between the number of log jams and channel sinuosity and between the number of pieces of large wood with sinuosity and channel width. Wood was highly dynamic between 2009 and 2012: 78% of individual pieces and 48% of log jams identified in the 2009 image had moved by 2012. Finally the supervised classification of imagery associated with ArcMap tools was tested to identify large wood.
2008 年 5 月智利 Chaitén 喷发的火山灰地层和喷发量
影响因子：
3.5
作者：
Alfano F
通讯作者：
Alfano F