Graduate Thesis Or Dissertation
 

Sediment production and delivery in Pistol River, Oregon and its effects on pool morphology

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/rv042x28n

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  • Sediment production and delivery in Pacific Northwest coastal streams can have damaging effects on channel morphology and anadromous fish habitat. The research in Pistol River was designed to determine if a link exists between sediment delivery processes and degradation of fish habitat. Objectives of this basin-wide analysis were to: 1) identify and inventory major sources of sediment; 2) estimate rates, timing and volumes of sediment production and delivery to streams; and 3) attempt to link sediment delivery to changes in pool volumes. Two sets of data were collected and analyzed. The first set used aerial photos and field data to identify and estimate sediment production and delivery. The second data set used channel and pool measurements to estimate V*, the percent of fine sediment in pools (Lisle and Hilton 1992). Primary factors influencing landslides are unstable geology, steep slopesin inner gorges and management activity. Sedimert production from landsliding increased as management increased while forested areas decreased. Sediment was delivered to Pistol River streams at a rate of 400m3/km2*yr. Fine sediment in pools was primarily stored on edges and downstream ends of pools where shear stress is typically less than at pool:heads and along the thaiweg. A positive correlation was found between total fine sediment volume and scoured pooi volume; however no relationship was found between V* and scoured pool volume. This suggests that even though larger pools have the capacity to store more sediment, the percent of fine sediment occupying scoured pool volume is independent of pool size. The relationship between V* and unjt area sediment delivery was positive and strongly correlated but only after the effects of local sediment input were considered. A spatial and temporal relationship was round between V* and time and distance of delivered sediment. The relationship between fine sediment volume in pools and sediment deliiiery indicated that landslide sediment delivery from years past is being transported through the stream system and stored in downstream pools, bars and terraces. Narrow, upstream reaches temporarily trap recently delivered fine sediments. Overall, in the short term (years), fine sediments are stored in pools in upland reaches. Over longer time scales (decades), sediment is transported downstream to unconstrained reaches where it is stored in various storage locations, including pools.
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file details Russell_Periann_1994.pdf 2017-08-19 Öffentlich Herunterladen