Geomorphology of a Cordilleran Ice Sheet drainage network through breached divides in the North Cascades Mountains of Washington and British Columbia

Riedel, Jon; Haugerud, Ralph A.; Clague, John J.

doi:10.1016/j.geomorph.2007.01.021

Cited by 20 publications

(32 citation statements)

References 29 publications

(48 reference statements)

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“…The watershed is defined by three main regional hydrologic divides that have a strong influence on climate and glacier distribution: the Pacific, North Cascades, and Skagit crests (Figure 2; Riedel et al 2007). Trending northwest through the center .…”

Section: Study Areamentioning

confidence: 99%

“…Trending northwest through the center . Skagit River watershed on 90m DEM base, showing major hydrologic divides as described by Riedel et al 2007.…”

Section: Study Areamentioning

confidence: 99%

“…Continental glaciation breached this divide at Skagit Gorge, and resulted in the capture of the upper Skagit by the westbound lower Skagit, adding significantly to the basin's size (Riedel et al 2007, Simon-Labric et al 2014). Skagit crest is breached only at Skagit Gorge, and remains a key hydrologic divide within the watershed, capturing moisture that otherwise would reach the Pacific crest downwind.…”

Section: Study Areamentioning

confidence: 99%

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Impact of Recent Glacial Recession on Summer Streamflow in the Skagit River

Riedel

Larrabee

2016

Northwest Science

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Section: Study Areamentioning

confidence: 99%

“…Trending northwest through the center . Skagit River watershed on 90m DEM base, showing major hydrologic divides as described by Riedel et al 2007.…”

Section: Study Areamentioning

confidence: 99%

Section: Study Areamentioning

confidence: 99%

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Impact of Recent Glacial Recession on Summer Streamflow in the Skagit River

Riedel

Larrabee

2016

Northwest Science

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“…Valleys trending parallel to the southward flow of the ice sheet were widened dramatically, while mountain passes were beveled. Ice sheet glaciation altered drainage patterns to produce long, interconnected valleys (Flint, 1971;Riedel et al, 2007). Breaching of high mountain divides and stream piracy by glacial lake spillover occurred early in the Pleistocene when initial ice sheet glaciation blocked drainage north into the Fraser and Okanogan rivers ( Fig.…”

Section: North Cascades Physiographymentioning

confidence: 99%

“…The low surface gradient caused rapid ice surface lowering over a large area in a short amount of time during deglaciation. Evidence of early divide exposure in the North Cascades includes up-valley sloping lateral moraines, and kame terraces and meltwater canyons through mountain passes (Haugerud, 1985;Waitt, 1972Waitt, , 1977Riedel et al, 2007).…”

Section: Deglaciation Of the North Cascades -Cordilleran Ice Sheetmentioning

confidence: 99%

Deglaciation of the North Cascade Range, Washington and British Columbia, from the Last Glacial Maximum to the Holocene

Riedel

2017

CIG

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Scale variation of post‐glacial sediment yield in Chilliwack Valley, British Columbia

Tunnicliffe

Church

2010

Earth Surf Processes Landf

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The Holocene volumetric sediment budget is estimated for coarse textured sediments (sand and gravel) in a large, formerly glaciated valley in southwest British Columbia. Erosion is estimated by compiling volumetric loss estimated in digital elevation models (DEMs) of gullied topography and by applying a non-linear diffusion model on planar, undissected hillslopes. Estimates of steepland yield are based on estimates of post-glacial deposition volumes in fans, cones and deltas at the outlets of low-order tributary catchments. Erosion of post-glacial fans and tributary valley fills is estimated by reconstructing formerly continuous surfaces. Results are classed by catchment order and compared across scales of contributing area, revealing declining specific sediment yield (in m 3 km -2 a -1) with catchment area for the smaller tributaries (<10 km 2 ) and increasing specific sediment yield for larger tributaries and Chilliwack Valley itself. Approximately 60% of mobilized sediment is redeposited in first-to third-order catchments, with lesser proportions stored at the outlets of higher order catchments. A simple network routing model emphasizes the significant sediment flux contributions from colluvium, drift blankets and gullies in steeper terrain. As this material is deposited at junctions within the lower drainage network, an increasing proportion of material is derived from remnant valley fills and para-glacial fans in the major valleys. Yield from lower-order, steepland catchments tends to remain in storage, indefinitely sequestered on footslopes. These observations have implications for modelling the post-glacial sediment balance amongst catchments of varying size. After 10 4 years, the system remains in disequilibrium. The critical linkage lies between low-order, hillslope catchments (

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Geomorphology of a Cordilleran Ice Sheet drainage network through breached divides in the North Cascades Mountains of Washington and British Columbia

Cited by 20 publications

References 29 publications

Impact of Recent Glacial Recession on Summer Streamflow in the Skagit River

Impact of Recent Glacial Recession on Summer Streamflow in the Skagit River

Deglaciation of the North Cascade Range, Washington and British Columbia, from the Last Glacial Maximum to the Holocene

Scale variation of post‐glacial sediment yield in Chilliwack Valley, British Columbia

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