| Popis: |
We address four objectives, focused on urban and urbanizing watersheds that drain forested (or once-forested) landscapes in humid regions: to document rates of channel change, to evaluate the relationship between development intensity and the rate of channel change, to evaluate geologic and topographic controls on channel change, and to determine if predevelopment conditions can be used to predict erosion-susceptible reaches. We used an 11-year data set covering 21 urban and suburban channels in western Washington, draining watersheds from 0.1 to 20 km, a range that covers both seasonal and perennial channels that generally respond readily and rapidly to watershed disturbance. The results indicate: 1. Rates of vertical channel change vary from below the range of measurement error ( |
