Long-term Continuous GIS-based Modeling of Forest Land Use Changes in Mica Creek Watershed in Northern Idaho Jan Boll Erin Brooks Bio. and Ag. Eng. Dept.

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Long-term Continuous GIS-based Modeling of Forest Land Use Changes in Mica Creek Watershed in Northern Idaho Jan Boll Erin Brooks Bio. and Ag. Eng. Dept. University of Idaho

Cumulative Watershed Effects Modeling SMR (Soil Moisture Routing) model WEPP (Water Erosion Prediction Project) model CCHE1D (One Dimensional Channel Network Model) WEPP SMR CCHE1D

Nested watershed system Clearcut Partial cut Control

Soil Moisture Routing (SMR) Model

SMR Soil Properties 4 m total soil depth – 0.5 m 51% saturated moisture content – 3.5 m 13% saturated moisture content 2.4 m total soil depth 0.5 m 51% saturated moisture content 1.9 m 25% saturation moisture content OR

Mass Balance (Flume 1) ETRunoffBaseflowQ (Sim)Q (Obs) Pre- disturbance After Road Clearcut ET reduced after clearcutting SMR over- or underpredicts Q

Runoff Soil depth

WEPP Model

CCHE1D Flume 3 Flume 4 Flume 2 Flume 1

Typical observed X-sectional data at Mica Creek near cross-section 2

Bank Erosion using a critical shear stress of 7 Pa

Future Work Improve WEPP/SMR flow simulations Snow and soil parameters in WEPP Energy balance snowmelt in SMR? Incorporate WEPP/SMR output into CCHE1D Parameterize CCHE1D using cross-sectional data

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