HR: 14:05h
AN: H32F-02 INVITED     [PDF]
TI: How to Reach Across a Basin: Integrating Basin-Scale Interactions to Reach-Scale Predictions
AU: * Miller, D J
EM: danmiller@earthsystems.net
AF: Earth Systems Institute, 3040 NW 57th Street, Seattle, WA 98107 United States
AU: Benda, L E
EM: leebenda@aol.com
AF: Earth Systems Institute, 3040 NW 57th Street, Seattle, WA 98107 United States
AU: Burnett, K
EM: Kelly.Burnett@orst.edu
AF: USDA Forest Service Pacific Northwest Research Station, 3200 Jefferson Way, Corvallis, OR 97331 United States
AU: Clarke, S
EM: Sharon.Clarke@orst.edu
AF: Forest Science Department Oregon State University, 3200 Jefferson Way, Corvallis, OR 97331 United States
AB: Many reach-scale aspects of channel morphology, habitat structure, and disturbance regime arise from basin-scale interactions. Valley-floor landforms and channel types reflect a potentially long history of events that have mobilized sediment from upstream and upslope. Processes that move sediment and woody debris act over a basin topography that controls the location of sediment delivery to channels. Subsequent movement and fluvial rearrangement of this sediment is modulated by valley morphology and channel-network structure. These controls on sediment production, movement, and storage can be inferred using digital elevation data coupled with simple models of sediment mobilizing processes. This characterization of the active processes can then be used to infer the spatial distribution of channel morphology and habitat structure. Coupled with climatic and anthropogenic drivers that produce temporal variability in the rate of sediment and wood production (storms, fires, road construction), these tools can be used to characterize channels throughout a basin in terms of the distribution of morphologies and habitat structures that can arise at each reach. We'll describe GIS modeling tools developed for debris-flow-prone landscapes of the Pacific Northwest and describe our strategy for verifying and using model predictions.
DE: 1803 Anthropogenic effects
DE: 1815 Erosion and sedimentation
SC: Hydrology [H]
MN: 2003 Fall Meeting