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A FRAMEWORK FOR PHOSPHORUS TRANSPORT MODELING IN THE LAKE OKEECHOBEE WATERSHED (1996)

Wagner, R. A. ; Tisdale, T S. ; Zhang, J.

Oxford, UK : Blackwell Publishing Ltd

Journal of the American Water Resources Association 32 (1996), S. 0

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ISSN: 1752-1688

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Architecture, Civil Engineering, Surveying , Geography

Notes: : A modeling framework was developed to determine phosphorus loadings to Lake Okeechobee from watersheds located north of the lake. This framework consists of the land-based model CREAMS-WT, the in-stream transport model QUAL2E, and an interface procedure to format the land-based model output for use by the in-stream model. QUAL2E hydraulics and water quality routines were modified to account for flow routing and phosphorus retention in both wetlands and stream channels. Phosphorus loadings obtained from previous applications of CREAMS-WT were used by QUAL2E, and calibration and verification showed that QUAL2E accurately simulated seasonal and annual phosphorus loadings from a watershed. Sensitivity and uncertainty analyses indicated that the accuracy of monthly loadings can be improved by using better estimates of in-stream phosphorus decay rates, ground water phosphorus concentrations, and runoff phosphorus concentrations as input to QUAL2E.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1752-1688.1996.tb03434.x

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Solvent and concentration dependence of hydrodynamic volumes and GPC elution volumes (1976)

Rudin, Alfred ; Wagner, R. A.

New York, NY [u.a.] : Wiley-Blackwell

Journal of Applied Polymer Science 20 (1976), S. 1483-1490

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ISSN: 0021-8995

Keywords: Chemistry ; Polymer and Materials Science

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics

Notes: The sizes of dissolved polymers can be estimated a priori at infinite dilution and under theta conditions from existing theories. The effects of concentration can be calculated by assuming that the hydrodynamic volume decreases from a maximum value at infinite dilution toward the theta condition volume, which is reached when the volume fraction of solvated polymer in solution is unity. The predicted hydrodynamic volumes coincide with results of small-angle x-ray scattering and effects of solvent and concentration on gel permeation chromatography elution volumes.

Additional Material: 2 Ill.