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Creator:: Moum, James N., Nash, Jonathan D., and Klymak, Jody M.
Abstract:: Varied observations over Oregon’s continental shelf illustrate the beauty and complexity of geophysical flows in coastal waters. Rapid, creative, and sometimes fortuitous sampling from ships and moorings has allowed detailed looks at boundary layer processes, internal waves (some extremely nonlinear), and coastal currents, including how they interact. These processes drive...
Resource Type:: Article
Full Text:: formation of waves with trapped cores. Journal of Fluid Mechanics 478:81–100. Levine, M.D. 2002. A

Creator:: Edwards, Kathleen A., MacCready, Parker, Moum, James N., Pawla, Geno, Klymak, Jody M., and Perlin, Alexander
Abstract:: Barotropic tidal currents flowing over rough topography may be slowed by two bottom boundary–related processes: tangential stress of the bottom boundary layer, which is generally well represented by a quadratic drag law, and normal stress from bottom pressure, known as form drag. Form drag is rarely estimated from oceanic observations...
Resource Type:: Article
Full Text:: occurs downstream (south) of the bump during maximum flood (Fig. 6a); dense fluid heaps up on its

Creator:: Nash, Jonathan, Kilcher, Levi F., and Moum, James N.
Abstract:: The initial composition of a river plume depends on the cumulative turbulent entrainment within the estuary and how this dilutes the supplied freshwater. Here we examine the relative roles of turbulence and freshwater input using observations from the Columbia River estuary and plume during two periods with contrasting river flow....
Resource Type:: Article
Full Text:: influenced by the tides) and recirculates its fluid. [3] Upstream of the lift-off point, the plume/river

Creator:: Nash, Jonathan D. and Moum, James N.
Abstract:: Observations of currents, hydrography, and turbulence provide unambiguous evidence for hydraulic control of flow over an isolated three-dimensional topographic feature on Oregon’s continental shelf. The flow becomes critical at the crest of the bank, forming a strong supercritical downslope flow in the lower layer. Farther downstream, internal hydraulic jumps form...
Resource Type:: Article
Full Text:: states over a small bank JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 106, NO. C3, PAGES 4593-4611, MARCH 15

Creator:: Hales, Burke, Moum, James N., Covert, P., and Perlin, A.
Abstract:: Detailed and repeated measurements of nitrate across the Oregon shelf, made coincident with turbulence measurements, reveal the importance of cross-isopycnal mixing via turbulence in providing nitrate to the upper water column. Spatial distributions of vertical gradients and turbulent fluxes in the Oregon coastal ocean reveal variability that could not have...
Resource Type:: Article
Full Text:: shore to the shelf break at a depth of �200 m. Southward, the shelf JOURNAL OF GEOPHYSICAL RESEARCH

Creator:: Perlin, A., Moum, James N., Klymak, J. M., Levine, Murray D., Boyd, Timothy John, 1958-2013, and Kosro, P. Michael
Abstract:: Near the bottom, the velocity profile in the bottom boundary layer over the continental shelf exhibits a characteristic law-of-the-wall that is consistent with local estimates of friction velocity from near-bottom turbulence measurements. Farther from the bottom, the velocity profile exhibits a deviation from the law-of-the-wall. Here the velocity gradient continues...
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Full Text:: ] that other factors limit JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 110, C10S10, doi:10.1029/2004JC002310

Creator:: Tang, Dajun, Moum, James N., Lynch, James F., Abbot, Phil, Chapman, Ross, Dahl, Peter H., Duda, Timothy F., Gawarkiewicz, Glen, Glenn, Scott, Goff, John A., Graber, Hans, Kemp, John, Maffei, Andrew, Nash, Jonathan D., and Newhall, Arthur
Abstract:: Since the end of the Cold War, the US Navy has had an increasing interest in continental shelves and slopes as operational areas. To work in such areas requires a good understanding of ocean acoustics, coastal physical oceanography, and, in the modern era, autonomous underwater vehicle (AUV) operations. Each area...
Resource Type:: Article
Full Text:: um ber 4, a quarterly journal of Th e o ceanography society. copyright 2007 by Th e o ceanography

Creator:: Avicola, G. S., Moum, James N., Perlin, A., and Levine, Murray D.
Abstract:: The upwelling-driven coastal jet off Oregon is in geostrophic balance to first order. The accompanying thermal wind shear is stable to shear instability. Yet enhanced turbulence is observed in the upwelling jet, typically as long, thin patches with horizontal to vertical aspect ratios of 10² to 10³ (median value ~300)....
Resource Type:: Article
Full Text:: Gregg data set provides the most relevant JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 112, C06024, doi

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