Temporal changes in rainfall intensity-duration thresholds for post-wildfire flash floods and sensitivity to spatiotemporal distributions of rainfall

June 4, 2021 4:46 pm

Source: https://doi.org/10.5194/nhess-2021-157

Temporal changes in rainfall intensity-duration thresholds for post-wildfire flash floods and sensitivity to spatiotemporal distributions of rainfall
Tao Liu, Luke A. McGuire, Nina Oakley, and Forest Cannon
Nat. Hazards Earth Syst. Sci. Discuss., https//doi.org/10.5194/nhess-2021-157,2021
Preprint under review for NHESS (discussion: open, 0 comments)
A well-constrained rainfall-runoff model forced by radar-derived precipitation is used to define rainfall intensity-duration (ID) thresholds for flash flood. The rainfall ID doubles in five years after a severe wildfire in a watershed in southern California, USA. Rainfall ID perform stably well when the intense pulses of rainfall over durations of 30–60 minutes that cover at least 15 %–25 % of the watershed. This finding could help issuing flash flood warnings based on radar-derived precipitation.