Surface Variability of Alluvial Fans Generated by Disparate Processes, Eastern Death Valley, CA
Surface Variability of Alluvial Fans Generated by Disparate Processes, Eastern Death Valley, CA
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不同过程产生的冲积扇的表面变化，加利福尼亚州东部死亡谷
DOI：
10.1080/00330120701836162
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发表时间：
2008
期刊：
影响因子：
--
通讯作者：
J. Whitworth
中科院分区：
文献类型：
--
作者：
T. Wasklewicz;Monika Mihir;J. Whitworth
利用1m平面分辨率机载激光条带测绘数据生成的数字高程模型(DEM)导数，研究了冲积扇的地表变异性。借助平面曲率分类，提取了泥石流(DF)扇和扇(主要由河流和一些较老的泥石流(混合流[MF])产生)的河道和河间维度。DF型和MF型风机的表面形貌有显著差异。与DF扇相比，MF扇倾向于具有较小的通道和间歇宽度，在间歇和间歇之间具有较小的高程差，并且比DF扇更具解剖性。这两个扇类之间的形态差异可以用形成地表特征的主要过程的差异来解释，但也可以解释作用于MF扇的次生侵蚀过程的优势。
This study explores the surface variability of alluvial fans from digital elevations model (DEM) derivatives generated from 1-m planimetric resolution airborne laser swath mapping data. Channel and interfluve dimensions of debris flow (DF) fans and fans generated from predominantly fluvial flows and some older debris flows (mixed flow [MF]) are extracted with the aid of a planimetric curvature classification. Significant differences are identified between the fan surface topography of DF and MF fans. MF fans tend to have smaller channel and interfluve widths, have smaller elevation differences between the crest of the interfluve and channel, and are more dissected than DF fans. The morphometric differences between the two fan classes can be explained by differences in the primary processes that develop the surficial features, but also the preponderance for secondary erosional processes acting on the MF fans.