Journal article

Probability and Consequence of Postfire Erosion for Treatability of Water in an Unfiltered Supply System

Petter Nyman, Peter Yeates, Christoph Langhans, Philip J Noske, Nadav Peleg, Christine Schaerer, Patrick NJ Lane, Shane Haydon, Gary J Sheridan

WATER RESOURCES RESEARCH | AMER GEOPHYSICAL UNION | Published : 2021

Abstract

Forested catchments are critical to water supply in major cities. Many of these catchments face the threat of postwildfire erosion, which can contaminate reservoir water. The aim of this paper is to determine the probability and duration of disruptions to treatability due to runoff-generated debris flows in the first year after a wildfire, before substantial vegetation recovery takes place. We combine models of reservoir hydrodynamics, postfire erosion, and stochastic rainfall to determine probability and magnitude of sediment concentration at the reservoir water offtake. Central to the paper is our technique for linking model components into a risk framework that gives probabilities to the ..

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