Twelve stream segments in the Silvies River drainage system were classified in
the fall of 1993 and again in 1994, using a morphological classification of natural
rivers (Rosgen 1994). Bankfull flow of stream channels is the key feature of this
system. Measurement of bankfull is used in the calculation of entrenchment ratio
and width/depth ratio. Analysis of the differences of the averages between years in
bankfull measurements showed that despite being consistently repeated at the same
locations along the channel, the measurements were found to be different
(p=0.000163 for entrenchment ratios and p = 0.0208 for width/depth ratios). Bankfull
was found to be a non-repeatable field measure, therefore, a poor benchmark for a
classification scheme.
Historical information collected for the study area indicated a history of domestic
livestock use that dates back as far as the mid-nineteenth century. Although grazed
by livestock for several years, settlement of the Bear and Silvies Valleys occurred
mostly around the turn of the twentieth century after the stockgrower's homestead
acts were passed. Ownership today is dominated by large (relative to the homestead
days) ranches. / Graduation date: 1996
| Identifer | oai:union.ndltd.org:ORGSU/oai:ir.library.oregonstate.edu:1957/34693 |
| Date | 30 May 1995 |
| Creators | Zweygardt, Louanne R. |
| Contributors | Buckhouse, John C. |
| Source Sets | Oregon State University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis/Dissertation |
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