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Full-Text Articles in Physical Sciences and Mathematics
Quantifying Channel Change Following Post-Fire Debris Flows In A Steep, Coastal Stream, Big Sur, California, Telemak Olsen
Quantifying Channel Change Following Post-Fire Debris Flows In A Steep, Coastal Stream, Big Sur, California, Telemak Olsen
WWU Graduate School Collection
Debris flows commonly occur following wildfire in steep landscapes, introducing large volumes of sediment to downstream fluvial systems. Fire-related sediment supply perturbations impact channel morphology, and importantly, fragile aquatic and riparian ecosystems downstream of disturbance. The Big Creek watershed drains 57 km2 of steep chaparral and coast redwood forest along California’s Central Coast. Streams in the Big Creek watershed typically exhibit step-pool/cascade morphology and serve as vital spawning habitat for anadromous Steelhead Trout (Oncorhynchus mykiss). In 2020, 97% of the Big Creek watershed burned in the Dolan Wildfire. In January 2021, an atmospheric river event triggered a series of …
Wave Runup And Morphologic Change On A Mixed-Sediment Beach In The Salish Sea, Wa, Avery Maverick
Wave Runup And Morphologic Change On A Mixed-Sediment Beach In The Salish Sea, Wa, Avery Maverick
WWU Graduate School Collection
A primary threat to coastal regions is extreme water levels from tides, storm surges, and waves which drive coastal evolution. Predicting wave runup, the vertical extent of wave uprush on a beach above still water level, and the morphologic responses to storms within the Salish Sea is complex because of the high variability of shoreline exposure to waves and wind, morphology, coastal landforms, and tide range across the region. As part of a USGS study, this project was designed to assess how wave energy offshore drives runup, validate existing runup models (van der Meer, 2002; Stockdon et al., 2006; Didier …
Net Shore-Drift And Artificial Structures Within Grays Harbor, Willapa Bay, And Mouth Of The Columbia River, Washington, B. Patrice (Berenthine Patrice) Thomas
Net Shore-Drift And Artificial Structures Within Grays Harbor, Willapa Bay, And Mouth Of The Columbia River, Washington, B. Patrice (Berenthine Patrice) Thomas
WWU Graduate School Collection
Net shore-drift, the overall result of sediment transport in the littoral zone, was studied along the shore within Grays Harbor, Willapa Bay, and mouth of the Columbia River, Washington. The length and direction of drift cells, which are discrete sediment compartments, was delineated using geomorphologic and sedimentologic indicators. Eight drift cells were identified in Grays Harbor, seven within Willapa Bay, and three along the section of the Columbia River shore studied. Drift cell lengths range from 200 m to approximately 6 km with an average of 1.5 km. Net shore-drift directions vary considerably with maximum fetch identified as the most …
The Deforest Creek Landslide And Sediment Transport In Deer Creek, Skagit County, Washington, John N. (John Nevin) Thompson
The Deforest Creek Landslide And Sediment Transport In Deer Creek, Skagit County, Washington, John N. (John Nevin) Thompson
WWU Graduate School Collection
Unit stream power, stream power per unit channel length, and total boundary shear stress were used to assess probable zones of river-sediment transport and storage following a large landslide into the Deer Creek basin, Skagit County, Washington. Since an initial deep-seated failure in glacial deposits in 1983 and a larger failure in 1984, the DeForest Creek landslide has introduced fine (±75% finer than coarse sand) sediment into the main channel of Deer Creek. The influx of sediment has caused infilling of void space in channel gravel by sand and silt, increased bank erosion, and increased slump activity adjacent to the …