How Long Do Runoff-Generated Debris-Flow Hazards Persist After Wildfire?

被引：6

作者：

Graber, Andrew P. ^{[1
]}

Thomas, Matthew A. ^{[1
]}

Kean, Jason W. ^{[1
]}

机构：

[1] US Geol Survey, Geol Hazards Sci Ctr, Golden, CO 80401 USA

来源：

GEOPHYSICAL RESEARCH LETTERS | 2023年 / 50卷 / 19期

关键词：

postfire debris-flow hazard persistence; debris flows; vegetation recovery; western United States; MODIS leaf area index; recovery ratio; debris flows and landslides; geomorphology: general; time series analysis; remote sensing; LEAF-AREA; RECOVERY; FIRE; THRESHOLDS; VALIDATION; CALIFORNIA; PRODUCTS; WATER;

D O I：

10.1029/2023GL105101

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Runoff-generated debris flows are a potentially destructive and deadly response to wildfire until sufficient vegetation and soil-hydraulic recovery have reduced susceptibility to the hazard. Elevated debris-flow susceptibility may persist for several years, but the controls on the timespan of the susceptible period are poorly understood. To evaluate the connection between vegetation recovery and debris-flow occurrence, we calculated recovery for 25 fires in the western United States using satellite-derived leaf area index (LAI) and compared recovery estimates to the timing of 536 debris flows from the same fires. We found that the majority (>98%) of flows occurred when LAI was less than 2/3 of typical prefire values. Our results show that total vegetation recovery is not necessary to inhibit runoff-generated flows in a wide variety of regions in the western United States. Satellite-derived vegetation data show promise for estimating the timespan of debris-flow susceptibility.

引用

页数：10

共 11 条

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