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Articles 1 - 7 of 7
Full-Text Articles in Physical Sciences and Mathematics
Groundwater Response To Precipitation Events, Kalaloch, Olympic Peninsula, Washington, Casey R. Hanell
Groundwater Response To Precipitation Events, Kalaloch, Olympic Peninsula, Washington, Casey R. Hanell
WWU Graduate School Collection
Tens of thousands of square kilometers of forestland in Washington are managed as working forests, primarily for timber production. The effects of timber harvesting on physical watershed processes continue to be the subject of intense research throughout the Pacific Northwest. Watershed analyses completed in Washington during the mid-1990s resulted in significant modifications to Washington's Forest Practices Act and Rules. These measures mandate rigorous evaluation of potential effects of timber harvesting on slope stability. Although timber harvesting has been linked to an increase in surface erosion and mass wasting in the Pacific Northwest, most studies have focused on shallow landslide processes. …
Holocene Glaciation Of The Green River Drainage, Wind River Range, Wyoming, Nigel Davies
Holocene Glaciation Of The Green River Drainage, Wind River Range, Wyoming, Nigel Davies
WWU Graduate School Collection
The Wind River Range (WRR) has long been the focus of glacial investigations, yet the Holocene record remains poorly understood. Moraines in the Green River Lakes drainage, on the northwest end of the Wind River Range, preserve a remarkably complete moraine record of late-Pleistocene recession, late-glacial and late-Holocene advances. At last glacial maximum (LGM) the study area supported large valley glaciers that extended beyond the rangefront; in historic times, however, glaciers are restricted to high alpine cirques. The largest remaining active glacier (Mammoth Glacier) has retreated to 2 km2 and is the primary source of meltwater and outwash to the …
Derivation Of The Eruption History Of The Prehistoric Ring Creek Lava Flow, Southern British Columbia, Samuel Bruno
Derivation Of The Eruption History Of The Prehistoric Ring Creek Lava Flow, Southern British Columbia, Samuel Bruno
WWU Graduate School Collection
The Ring Creek lava flow is a 10,000 year old, post-glacial dacitic lava flow that originated from Opal Cone, a small cinder cone on the south east flank of Mt. Garibaldi, British Columbia. Disequilibrium texture of amphibole combined with clotting in plagioclase suggests that the Ring Creek magma stalled beneath Opal Cone for at least 440 days before the eruption of the Ring Creek lava flow. Use of an igneous plagioclaseliquid thermo barometer and hygrometer indicate shallow storage conditions of 818 - 868o C, 2.4 - 3.6 kbar, and 0.2 - 2.0 wt% H2O. Surge in plagioclase growth, evidenced by …
Glacial And Geothermal Dynamics In Sherman Crater, Mount Baker, Washington, Melissa Park
Glacial And Geothermal Dynamics In Sherman Crater, Mount Baker, Washington, Melissa Park
WWU Graduate School Collection
Although quiescent since a significant thermal event in 1975, Mount Baker, in Washington, continues degassing from fumaroles in Sherman Crater, indicating the presence of a connection to an active magmatic system at depth. The apparent equilibrium condition of the crater glacier between 2003 and 2008, despite lying well above the regional equilibrium line altitude, suggests that melting of basal ice by heat flux from fumaroles and heated ground must balance the glacier's positive surface mass-balance. My investigation of glacial and geothermal dynamics in Sherman Crater between 2009 and 2010 provides the first rigorous quantitative assessment of the Sherman Crater glacier: …
Sub-Vertical Fluid Flow During Prograde Metamorphism In The Nason Terrane, North Cascades Crystalline Core, Washington, Perry M. (Perry Martin) Ponshock
Sub-Vertical Fluid Flow During Prograde Metamorphism In The Nason Terrane, North Cascades Crystalline Core, Washington, Perry M. (Perry Martin) Ponshock
WWU Graduate School Collection
The nature of fluid movement through the lower crust during prograde metamorphism is an important but poorly understood part of the global H2O and CO2 cycles on this planet. A broad set of samples from some of the structurally deepest exposures of the Nason terrane in the Cascades crystalline core were used to evaluate fluid movement during peak amphibolite-grade metamorphism. XRF bulk-rock chemical analyses, T-X(CO2) pseudosections, and thin-section petrography were used to identify equilibrium fluid composition for the solid phases in each specimen; these span the gamut of X(CO2) values. The juxtaposition of gneiss and marble-lithologies with differing equilibrium fluid …
H2o Contents In Olivine-Hosted Melt Inclusions From Primitive Magmas In The Northern Cascade Arc, Steven D. Shaw
H2o Contents In Olivine-Hosted Melt Inclusions From Primitive Magmas In The Northern Cascade Arc, Steven D. Shaw
WWU Graduate School Collection
The subducting Juan de Fuca plate is the hot endmember of slabs worldwide, and its unique thermal character prompts debate about the role of fluid-flux melting versus decompression melting in the Cascade arc. While slow subduction of this hot slab is expected to result in strong dehydration prior to reaching sub-arc depths, there is no consensus on whether the slab is entirely dehydrated at this point, or whether volcanism is the result of water-poor, decompression melting, or fluid-flux melting. I provide the first measurements of pre-eruptive volatile contents in olivine-hosted melt inclusions from primitive magmas in the northern region of …
Hydrologic And Geomorphic Assessment Of Ebey's Prairie, Central Whidbey Island, Washington, Michael A. (Michael Allen) Larrabee
Hydrologic And Geomorphic Assessment Of Ebey's Prairie, Central Whidbey Island, Washington, Michael A. (Michael Allen) Larrabee
WWU Graduate School Collection
Ebey's Prairie, Washington, was once bisected by a broad riparian corridor consisting of waterlogged soils, swampy areas, seasonal ponds, and intermittent flows, which helped recharge the local aquifer. By the mid-1900s, agriculture drainage tiles, drainage ditches, and fill were being installed by landowners to increase tillable acreage. The extent and location of these drainage tiles or the effects these tiles have had on surface water and subsequently on aquifer recharge in the area remains uncertain. In this study, I characterized the modern and historic surface hydrologic conditions of Ebey's Prairie and their relationship to the local geomorphology. I used the …