Hydro-geomorphic response models for burned areas and their applications in land management

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TitleHydro-geomorphic response models for burned areas and their applications in land management
Publication TypeJournal Article
Year of Publication2013
AuthorsNyman, P, Sheridan, GJ, Lane, PNJ
JournalProgress in Physical Geography
Pagination787 - 812
Date Published12/2013
AbstractErosion, flash floods and debris flows are hydro-geomorphic processes that intensify due to catchment disturbance by wildland fire. Predictive models of these processes are used by land managers to quantify reha- bilitation effectiveness, prioritize resources andevaluate trade-offs between different managementstrategies. Predictions can be difficult to make, however, because of heterogeneous landscapes, stochastic rainfall, and the transient and variable fire effects. This paper reviews hydro-geomorphic response models for burned areasandexploreshowmodellingapproachesandsourcesofuncertaintychangedependingonthefocusques- tion (or purpose) and the associated spatial-temporal scale of the model domain. The review shows that cur- rent models focus primarily on predicting catchment responses during a recovery period (within-burn timescales), a relatively short temporal window during which rainfall is an important source of uncertainty. At longer (between-burn) timescales, the fire regime itself, and not just fire severity, becomes a variable com- ponent of the model. At this temporal scale, the catchment processes respond to variations in the frequency and severity with which a landscape is conditioned (or ‘primed’) by fire and rain storms. Conditioning is a sto- chastic process that is determined by the spatial-temporal overlap of fire disturbance and rain storms. The translation of overlaps to hydro-geomorphic responses is a function of intrinsic catchment attributes (e.g. permeability, slope and catchment area). Capturing the stochastic interplay between fire and rain storms is important when land-management questions shift towards the issues of climate change and landscape-scale interventions such as prescribed burning. The review therefore includes a discussion on fire and rainfall regimes as variables which drive decadal and regional variability in hydro-geomorphic processes
Short TitleProgress in Physical Geography