Model Overview

Forest Water Demand (Lead: Kellie Vache)

Forest State and Transition and Fire and Harvest Disturbance (Lead: Dave Turner)

Upland forests occupy two thirds of the Willamette Basin and are significant water users.  We estimate the water demand from forests in these upland IDUs using an equation that determines daily evapotranspiration rates from forest characteristics and climate conditions (Monteith and Unsworth, 2013).  The forest state and transition sub-model predicts how these forest characteristics change over time.  IDUs begin with attributes that describe vegetation type, age class and leaf area (ILAP, 2013).  The sub-model then ages the IDUs along expected succession pathways for different vegetation types.  The fire and harvest sub-model introduces disturbances which can restart a succession pathway or shift an IDU from one vegetation type to another.  This sub-model uses information from a more complicated dynamic vegetation model called MC2 (Rogers et al., 2011) to predict changes in fire probabilities and vegetation types under different future climate scenarios.

Key Data Sources and Assumptions

Links to additional Documentation

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