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contributor authorTryhorn, Lee
contributor authorLynch, Amanda
contributor authorAbramson, Rebecca
contributor authorParkyn, Kevin
date accessioned2017-06-09T16:21:15Z
date available2017-06-09T16:21:15Z
date copyright2008/05/01
date issued2008
identifier issn0027-0644
identifier otherams-66341.pdf
identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4207666
description abstractThis paper describes work to improve the understanding of the broad range of factors affecting the occurrence of postfire flooding, with emphasis on an event that occurred in the Alpine Shire, Victoria, Australia, in 2003. Analysis and mesoscale modeling of the conditions surrounding the event suggests that the drivers of the extreme rainfall event were above-average precipitable water in the atmosphere, significant values of CAPE, producing strong updrafts within the thunderstorm capable of supporting large quantities of suspended water droplets, and thunderstorm cell regeneration in the same area. However, atmospheric instability was further enhanced by anabatic breezes, above-average boundary layer moisture, and increased surface heating resulting from reduced surface albedo and soil moisture of the recently burned fire surface. Flash flooding resulted, due to 1) the storm cells likely being pulse wet microbursts, 2) cell regeneration over the same area (very little horizontal movement), and 3) the small catchment size. It is likely that a further contributor to the observed flash flood was the reduced infiltration often observed in recently burned catchments; these factors will be explored in a subsequent hydrologic study. It is intended that the mechanisms elucidated in this study will assist in emergency preparedness in the Alpine Shire. Given the warmer conditions expected with near-term anthropogenic climate change for the Alpine Shire, and the concomitant increase in fires, this causal relationship, even for a relatively rare event, has implications for emergency managers and Alpine Shire residents.
publisherAmerican Meteorological Society
titleOn the Meteorological Mechanisms Driving Postfire Flash Floods: A Case Study
typeJournal Paper
journal volume136
journal issue5
journal titleMonthly Weather Review
identifier doi10.1175/2007MWR2218.1
journal fristpage1778
journal lastpage1791
treeMonthly Weather Review:;2008:;volume( 136 ):;issue: 005
contenttypeFulltext


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