DISTRIBUTION OF COARSE WOODY DEBRIS IN A MOUNTAIN STREAM, WESTERN CASCADE RANGE, OREGON

The distribution of coarse woody debris in a fifth-order Cascade Range (Oregon) stream system was examined from a geomorphic point of view. The number, volume, location, orientation, decay class, and pool forma tion roles of coarse woody debris were investigated. The processes of coarse woody debris production, transport, and storage, which vary wit h channel and valley floor geomorphology, are responsible for the patt ern of coarse woody debris distribution on valley floors. Channel widt h and sinuosity are the main factors that control production, storage sites, and hydrologic effects of coarse woody debris. The amount of co arse woody debris and the number of pool-forming pieces are relatively high in wide, sinuous reaches, where a complex structure of floodplai ns and riparian forests develops in association with a braided channel pattern. These relations are transferable to other systems with simil ar relations of coarse woody debris piece length to channel width.