Published literature about six Pacific Northwest stream systems was contrasted
to provide a regional perspective on channel response to disturbance. This
investigation was prompted by a combination of recent environmental legislation,
mounting social pressures to plan projects at a drainage basin scale, and the difficulty
in defining and predicting the response and recovery of a stream channel to land-use
management or storm events.
Detailed studies of Redwood Creek, CA; the San Lorenzo River, CA; the South
Fork Salmon River, ID; the Upper Middle Fork of the Willamette River, OR; the Alsea
River System, OR; and Carnation Creek, B.C. were reviewed and contrasted.
Differences in channel response to disturbance appear to be the result of the sequence
of storms, the interactions between storms and land-use, the processes that deliver
sediment to the channel, the available stream power, and the bank stability. Basins
with low debris avalanche and earthflow potential, high stream power, and stable
stream banks experience only localized and short-lived response to disturbance. On
the other hand, basins with frequent debris avalanches or high earthflow potential and
unstable banks experience widespread and persistent response.
This study concludes that there must be realization and acceptance of the
random nature of channel response and recovery following disturbance. Field
evaluation, professional judgement, risk assessment, and adaptive management are
the most powerful tools available in the prediction of channel response. / Graduation date: 1993
| Identifer | oai:union.ndltd.org:ORGSU/oai:ir.library.oregonstate.edu:1957/37126 |
| Date | 12 January 1993 |
| Creators | Hodgins-Carlson, Terry Anne |
| Contributors | Warkentin, Benno |
| Source Sets | Oregon State University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis/Dissertation |
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