Longitudinal transport within natural streams is known to include advection, shear dispersion, and transient storage. Transient storage in the surface water is driven by velocity shear around obstructions and roughness elements; in the sub-surface it is driven by pressure gradients and properties of porous media. Longitudinal dispersion is similarly a property of shear velocity in surface water. These fluid transport processes are important to longitudinal transport within Natural Channel Design (NCD) sites, where turbulent eddies are formed around boulder structures. NCD is a widely used stream restoration technique, and assessment of water quality improvement resulting from this approach requires understanding the influence of fundamental transport processes on stream-water residence times. This study presents the first comparison of two independent approaches to deriving transient storage characteristics within NCD sites. These approaches include inverse model calibration and forward model prediction based on physical measurements of transport characteristics. For application of these approaches over short experimental lengths, a novel method for integrating multiple tracer profiles within a stream transect is developed. Results support successful application of both transient storage model approaches under restricted circumstances. The establishment of an integrated tracer profile reduces irregularity found in individual transport signals and successfully collapses lateral transport heterogeneity into a form compliant with transient storage modeling. Comparison of modeling approaches reveals differences in estimation of stream-water residence time characteristics, and suggests further evaluation of forward model prediction techniques is warranted. Transient storage modeling in the context of historical transport theory is presented, with discussion of future areas of research.
|Advisor:||Endreny, Theodore A.|
|Commitee:||Kroll, Charles N., Lautz, Laura K.|
|School:||State University of New York College of Environmental Science and Forestry|
|Department:||Environmental & Resources Engineering|
|School Location:||United States -- New York|
|Source:||MAI 51/04M(E), Masters Abstracts International|
|Subjects:||Hydrologic sciences, Engineering, Environmental science|
|Keywords:||Natural channel design, River restoration, Stream restoration, Transient storage modeling, Transport modeling|
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