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Articles 1 - 5 of 5
Full-Text Articles in Physical Sciences and Mathematics
Characterization Of Coarse Sediment Transport On A Mixed Sand And Gravel Beach: Cherry Point Aquatic Reserve, Blaine, Washington, Meghan E. (Meghan Elizabeth) Weaver
Characterization Of Coarse Sediment Transport On A Mixed Sand And Gravel Beach: Cherry Point Aquatic Reserve, Blaine, Washington, Meghan E. (Meghan Elizabeth) Weaver
WWU Graduate School Collection
This study examines coarse-sediment transport behavior on a mixed sand and gravel (MSG) beach at Cherry Point Aquatic Reserve in Blaine, Washington. Radio Frequency Identifier (RFId) Passive Integrated Transponder (PIT) tags were used to trace large pebbles and cobbles (51 - 129 mm in diameter) between mid-January and early-March, 2012. Transport data were combined with wind, current and water level data recorded by nearby weather stations, as well as wave data collected by an offshore pressure sensor, into a comprehensive data set. Tide, wind and wave parameters were then input into XBeach, a relatively new nearshore numerical model [Roelvink et …
Determining Garnet Crystallization Kinetics From Growth Zoning And Mn-Calibrated Sm-Nd Ages, Rose Bloom
Determining Garnet Crystallization Kinetics From Growth Zoning And Mn-Calibrated Sm-Nd Ages, Rose Bloom
WWU Graduate School Collection
By working under the assumption that garnet strongly fractionates Mn, the change in measured XMn from the core to rim of a garnet can be used to represent the progression of time since nucleation. Core, mantle, and rim zones from nine snowball garnets collected at the Pinney Hollow Formation, Townshend Dam, VT were analyzed using electron probe microanalysis (EPMA) as well as Sm/Nd isotopic methods. Two-point garnet-matrix Sm/Nd ages are complex, with some showing apparent reverse age zoning and unrealistically young ages. Therefore, some garnet ages were culled, including those with poor 147Sm/144Nd ratios (< 0.75), low Nd concentrations (> 0.2 ppm), and rim ages …
Metamorphic Evolution Of The Northwest Chelan Block, North Cascades, Washington, Aaron A (Aaron Arthur) Fitts
Metamorphic Evolution Of The Northwest Chelan Block, North Cascades, Washington, Aaron A (Aaron Arthur) Fitts
WWU Graduate School Collection
The Cascades crystalline core (CC) is the fault bound southern extension of the Coast Plutonic Complex, a Cretaceous orogenic welt that forms the northernmost section of the North American Cordillera. Of primary interest in this study is the tectonic history of the Cascade River region in the northwest of CC. The Sibley Creek area of the Cascade River region is a zone of high-grade metamorphic rocks bound by Cretaceous plutons to the north, east, and west and the Tertiary Entiat fault to the south. Analysis of deformed and undeformed granitic plutons in the area could help constrain the absolute ages …
Modeling Slope Failure In The Jones Creek Watershed, Acme, Washington, Brandon M. Brayfield
Modeling Slope Failure In The Jones Creek Watershed, Acme, Washington, Brandon M. Brayfield
WWU Graduate School Collection
Mountain watersheds in the Pacific Northwest are particularly susceptible to shallow landslides and debris flows during periods of intense precipitation. The Jones Creek watershed near Acme, WA, is a 6.7 km2 basin that hosts several active landslides. Shallow mass wasting on the unvegetated landslide toes, and deep-seated rotational slide movement can lead to landslide dam outburst floods and debris flows. There are approximately 100 buildings constructed on a 0.75 km2 alluvial fan deposited by debris flows sourced in the watershed. Predicting the occurrence of mass wasting and deep-seated movement events as they relate to the duration and intensity of antecedent …
Thermal And Hydrological Conditions Of The Goethe Rock Glacier, Central Sierra Nevada, California, Jezra Beaulieu
Thermal And Hydrological Conditions Of The Goethe Rock Glacier, Central Sierra Nevada, California, Jezra Beaulieu
WWU Graduate School Collection
The potential of rock glaciers in the Sierra Nevada to provide critical hydrological reservoirs and ecological habitats in a changing climate remains largely untested. In an effort to constrain the microclimatic contributions of buried ice, continuous temperatures were recorded in the near-surface debris of a variety of ice-cored and associated landforms in the Goethe cirque from August 2011 and July 2012 (Goethe rock glacier=GRG, valley-wall rock glaciers=VRG, Recess Peak debris=RPD, talus=TAL, ranging from most ice to least ice). In addition, continuous meteorological conditions on the rock glacier and stage of the main meltwater outwash stream were recorded to assess temporal …