Dissolved Oxygen Model Selection Sample Clauses

Dissolved Oxygen Model Selection. The model selected for this project must be able to simulate the major processes that affect in-stream dis- solved oxygen, including temperature, biological oxygen demand (BOD), SOD, and algal/plant photosynthe- sis/respiration cycles. The daily variability in DO is of interest, and so the model must be capable of simulat- ing short-term variability in temperature and DO. Because Clarks Creek is well-mixed under most conditions, a 1-dimensional stream network model can be utilized. However, the model must be capable of simulating dynamic flow conditions. This is intended to overcome the limitation of the previous (steady-state hydraulic) QUAL2Kw software in simulating Clarks Creek wet weather conditions. Several modeling codes meet the general requirements listed above, including Water Quality Analysis Simu- lation Program (WASP), AQUATOX, CE-QUAL-W2, QUAL2Kw, and HSPF. In choosing among these models, one consideration is that a hydrologically variable simulation of water quality will require specification of a time series of wet weather flows and loads from the watershed to the receiving water. A watershed (rainfall-run- off) model such as HSPF would be a logical tool for simulating the effect of management practices in the wa- tershed on flows and pollutant loads to Clarks Creek and its tributaries. An HSPF model for hydrology and sediment transport already exists for the watershed, although the water quality components must be ex- panded to meet project goals. Another consideration is that the previous TMDL analysis utilized a steady- flow version of QUAL2Kw to simulate water quality in Clarks Creek. Although that model would have to be modified to simulate dynamic flows, the retention of QUAL2Kw will provide continuity between this project and the prior analysis. Based on the considerations above, the project team selected a linked modeling framework for Clarks Creek. HSPF will be utilized as the watershed (rainfall-runoff) component and for simulating water quality in major tributaries. The HSPF model will be linked to QUAL2Kw, which will the primary tool for simulating water quality in the mainstem of Clarks Creek. Additional details on the proposed modeling approach are provided in the following sections.
Sample 1
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