HR: 17:30h
AN: H44B-06    [Abstracts]
TI: Long-term continuous GIS-based modeling of forest land use changes in Mica Creek watershed in northern Idaho
AU: * Boll, J
EM: jboll@uidaho.edu
AF: Biological and Agricultural Engineering, University of Idaho P.O. Box 442060, Moscow, ID 83844-2060 United States
AU: Brooks, E S
EM: broo2789@uidaho.edu
AF: Biological and Agricultural Engineering, University of Idaho P.O. Box 442060, Moscow, ID 83844-2060 United States
AU: Hubbart, J A
EM: hubb8662@uidaho.edu
AF: Forest Resources, University of Idaho P.O. Box 441133, Moscow, ID 83844-1133 United States
AU: Link, T E
EM: tlink@uidaho.edu
AF: Forest Resources, University of Idaho P.O. Box 441133, Moscow, ID 83844-1133 United States
AU: Cundy, T W
EM: Terry.Cundy@potlatchcorp.com
AF: Potlach Corporation, Wood Products, Western Division P.O. Box 1016, Lewiston, ID 83501-1016 United States
AU: Elliot, W J
EM: welliot@fs.fed.us
AF: Rocky Mountain Research Station, U.S. Forest Service 1221 South Main, Moscow, ID 83843 United States
AU: Gravelle, J A
EM: jag@pineorchard.com
AF: Forest Resources, University of Idaho P.O. Box 441133, Moscow, ID 83844-1133 United States
AB: Long-term effects of land use change on watershed hydrology are difficult to determine experimentally. Usually, many different disturbances occur that may mask the land use changes of interest. In forested watersheds, these disturbances include clear cutting, road building and fires. In this study, we use an extensive data set from the 28 km2Mica Creek Experimental Watershed (MCEW). This watershed was developed in 1990 by Potlatch Corporation to evaluate the effects of modern forest practices on stream resources. The Mica Creek watershed is a large 97 km2 tributary watershed to the St. Joe River near St. Maries, Idaho. The MCEW has a nested study design, which allows for the analysis of cumulative effects as well as the traditional comparison of treatment versus control. Treatments include road building in 1996, and clearcut and partial-cut logging in 2001. Periods of two to five years were included for pre-treatment and post-treatment monitoring. The MCEW has been instrumented since 1990 for discharge, flow proportional suspended sediment sampling, bedload sampling (during events), water temperature, particle size distribution, channel shape, canopy cover, and channel gradients at 32 stream cross-sections, and precipitation at 4 locations and a cooperative SNOTEL site. We applied the Soil Moisture Routing model, and CCHE1D, a channel routing model for water and sediment, to the MCEW data set. Our results include the simulation of a control period (calibration), road building, and logging. Simulation results are evaluated using spatial patterns, stream flow records at seven flumes, and water yield data. After model simulation, we selected several land use change scenarios for further model runs. In these model runs, we analyzed model output for water yield changes and associated hydrologic variables such as evapotranspiration, runoff, and interflow.
DE: 1804 Catchment
DE: 1836 Hydrological cycles and budgets (1218, 1655)
DE: 1847 Modeling
DE: 1860 Streamflow
DE: 1879 Watershed
SC: Hydrology [H]
MN: Fall Meeting 2005