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The transport and toxicity of metals at the California Gulch, Colorado mine-impacted watershed were simulated with a spatially distributed watershed model. Using a database of observations for the period 1984-2004, hydrology, sediment transport, and metals transport were simulated for a June 2003 calibration event and a September 2003 validation event.(More)
BACKGROUND Polyunsaturated fatty acids (PUFAs) are intrinsic cell membrane components and closely involved in neurotransmission and receptor function. Lower omega-3 levels are associated with increased risk of coronary artery disease (CAD), increases in cardiac events in CAD patients, and depression. We sought to examine relationships between depression and(More)
Prerequisites: Interest in river engineering and sediment transport. Undergraduate courses in fluid mechanics and differential equations. Description: Analysis of the interaction between fluids and solids. Mechanics of sediment transport, incipient motion, bed forms, bed load, suspended load, wash load and total load. Practical applications of sediment(More)
The average bed and sidewall shear stresses in smooth rectangular open-channel flows are determined after solving the continuity and momentum equations. The analysis shows that the shear stresses are function of three components: (1) gravitational; (2) secondary flows; and (3) interfacial shear stress. An analytical solution in terms of series expansion is(More)
Lipoprotein lipase (LPL) is well known for its role in the catabolism of plasma triglyceride (Tg)-rich lipoproteins, such as very low density lipoproteins (VLDL) and chylomicrons. The action of LPL on Tg-rich lipoproteins provides free fatty acids to skeletal muscle and adipose tissues, the main sites of LPL synthesis. Several studies have demonstrated that(More)
Contaminant releases from upland areas can have adverse water quality and stream ecology impacts. TREX (Two-dimensional, Runoff, Erosion, and Export) is a spatially distributed, physically-based model to simulate chemical transport and fate at the watershed scale. TREX combines surface hydrology and sediment transport features from the CASC2D watershed(More)
Detailed field measurements during the 1998 flood of the Rhine River in The Netherlands show that both Manning n and Darcy–Weisbach friction factor f increase with discharge. The changes in bedform roughness height and friction factors are attributed to the increased dune height during floods. There is a near-peak hysteresis in the dune height measurements.(More)
Sediment plugs occasionally form along the Middle reach of the Rio Grande River, completely blocking the main channel of the river. Aggradation within the Elephant Butte Reach contributes to a decrease in channel capacity, which may be a cause of sediment plug formation. Elephant Butte Reach is the last reach of the Middle Rio Grande and is impounded to(More)
Successive reaches of the Rio Grande have maintained equivalent channel widths of 50 and 250 m, respectively, over long periods of time. It is hypothesized that alluvial channels adjust bed slope to match the long-term changes in channel width. Analytical relationships show that wider river reaches develop steeper slopes. A modeling approach using daily(More)