Abstract
In this study, SEDDEER (Sediment Deposition and Erosion), a stand-alone sediment and contaminant model which simulates one water box and the underlying multiple sediment bed layers, was incorporated into Water Quality Analysis Simulation Program (WASP7.4). WASP7.4 toxic module (TOXI7) was modified to include SEDDEER to develop WASP_SEDDEER model. Tests were designed to ensure that the coupling of the WASP7.4 and SEDDEER bed models is correct. The tests compared WASP_SEDDEER one-box simulations against SEDDEER results to verify fluxes across the sediment-water interface. Also, two-vertical-boxes water-column model tests were performed to compare WASP_SEDDEER output against Environmental Fluid Dynamic Code (EFDC) solutions. The comparisons revealed a good fitting between WASP_SEDDEER and EFDC results (R2 values above 0.95) verifying a successful incorporation. Exploratory applications of EFDC, WASP7.4, and WASP_SEDDEER to Mobile Bay for simulating sediment and contaminant transport showed the capabilities of WASP_SEDDEER for estimating suspended sediment and contaminant concentrations throughout the computational domain.
Highlights
Water quality modeling is an economically feasible mean of predicting water quality and making water resources management decisions
3.1 One-Box Model Testing Figures 5 through 9 present comparisons of sediment & contaminant and bed elevation simulations between WASP_SEDDEER and Sediment Deposition and Erosion (SEDDEER) under the five scenarios included in the test
The results demonstrate that WASP_SEDDEER and SEDDEER generate the same output, indicating that the incorporation of sediment into Water Quality Analysis Simulation Program (WASP) TOXI7 has been performed correctly for sediment deposition and resuspension in a single box
Summary
Water quality modeling is an economically feasible mean of predicting water quality and making water resources management decisions. Within all the processes usually modeled by water quality models, the modeling of sediment transport, in particular, could have profound effects on water quality management. The proper conceptualization and modeling of sediment transport is fundamental for achieving realistic management scenarios and could influence greatly the design of Total Maximum Daily Loads (TMDLs) or Best Management Practices (BMPs). Mechanistic water quality models are based on the conservation of mass (Chapra, 1997). Box models capture much of the basic physics of mass conservation and are of practical value in determining some of the bulk, or overall, properties (Hearn, 2008). A well-established water quality model -the Water Quality Analysis Simulation Program (WASP) (Wool et al, 2002) includes algorithms for implementing multiple sediment layers, sediment settling and resuspension, as well as bed layer alterations and compaction, in a simulation
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