Thresholds for post-wildfire debris flows: Insights from the Pinal Fire, Arizona, USA

被引:41
|
作者
Raymond, Carissa A. [1 ]
McGuire, Luke A. [1 ]
Youberg, Ann M. [2 ]
Staley, Dennis M. [3 ]
Kean, Jason W. [3 ]
机构
[1] Univ Arizona, Dept Geosci, Gould Simpson Bldg,1040 East Fourth St, Tucson, AZ 85721 USA
[2] Univ Arizona, Arizona Geol Survey, 1955 E 6th St, Tucson, AZ 85721 USA
[3] US Geol Survey, Geol Hazards Sci Ctr, Golden, CO USA
关键词
rainfall thresholds; dimensionless discharge; soil hydraulic properties; critical discharge threshold; receiver operating characteristic analysis; INTENSITY-DURATION THRESHOLDS; SOIL-HYDRAULIC-PROPERTIES; RAINFALL THRESHOLDS; WATER REPELLENCY; INITIATION; EROSION; LANDSLIDES; COLORADO; RUNOFF; SORPTIVITY;
D O I
10.1002/esp.4805
中图分类号
P9 [自然地理学];
学科分类号
0705 ; 070501 ;
摘要
Wildfire significantly alters the hydrologic properties of a burned area, leading to increases in overland flow, erosion, and the potential for runoff-generated debris flows. The initiation of debris flows in recently burned areas is well characterized by rainfall intensity-duration (ID) thresholds. However, there is currently a paucity of data quantifying the rainfall intensities required to trigger post-wildfire debris flows, which limits our understanding of how and why rainfall ID thresholds vary in different climatic and geologic settings. In this study, we monitored debris-flow activity following the Pinal Fire in central Arizona, which differs from both a climatic and hydrogeomorphic perspective from other regions in the western United States where ID thresholds for post-wildfire debris flows are well established, namely the Transverse Ranges of southern California. Since the peak rainfall intensity within a rainstorm may exceed the rainfall intensity required to trigger a debris flow, the development of robust rainfall ID thresholds requires knowledge of the timing of debris flows within rainstorms. Existing post-wildfire debris-flow studies in Arizona only constrain the peak rainfall intensity within debris-flow-producing storms, which may far exceed the intensity that actually triggered the observed debris flow. In this study, we used pressure transducers within five burned drainage basins to constrain the timing of debris flows within rainstorms. Rainfall ID thresholds derived here from triggering rainfall intensities are, on average, 22 mm h(-1) lower than ID thresholds derived under the assumption that the triggering intensity is equal to the maximum rainfall intensity recorded during a rainstorm. We then use a hydrologic model to demonstrate that the magnitude of the 15-min rainfall ID threshold at the Pinal Fire site is associated with the rainfall intensity required to exceed a recently proposed dimensionless discharge threshold for debris-flow initiation. Model results further suggest that previously observed differences in regional ID thresholds between Arizona and the San Gabriel Mountains of southern California may be attributed, in large part, to differences in the hydraulic properties of burned soils. (c) 2019 John Wiley & Sons, Ltd.
引用
收藏
页码:1349 / 1360
页数:12
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