Model:QUAL2K

Contact

Name	Steve Chapra
Type of contact	Model developer
Institute / Organization	Tufts University, Civil and Environmental Engineering Dept.
Postal address 1	200 College Avenue
Postal address 2
Town / City	Medford
Postal code	02155
State	Massachusetts
Country	USA"USA" is not in the list (Afghanistan, Albania, Algeria, Andorra, Angola, Antigua and Barbuda, Argentina, Armenia, Australia, Austria, ...) of allowed values for the "Country" property.
Email address	Steven.Chapra@tufts.edu
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Name	Greg Pelletier
Type of contact	Model developer
Institute / Organization
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Name	Hua Tao
Type of contact	Model developer
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QUAL2K

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Summary Also known as Model type Single Model part of larger framework Note on status model Date note status model biogeochemistry, water quality, Technical specs Supported platforms Windows Other platform Programming language Fortran90 Other program language Visual Basic (VBA), Excel Code optimized Single Processor Multiple processors implemented Nr of distributed processors Nr of shared processors Start year development 1987 Does model development still take place? Yes If above answer is no, provide end year model development Code development status When did you indicate the 'code development status'? Model availability As code Source code availability (Or provide future intension) Through web repository Source web address http://www.epa.gov/athens/wwqtsc/html/qual2k.html Source csdms web address Program license type Other Program license type other NOT SURE Memory requirements -- Typical run time -- In/Output Describe input parameters Too many to mention here Input format Other input format Describe output parameters -- Output format Other output format Pre-processing software needed? No Describe pre-processing software Post-processing software needed? No Describe post-processing software Visualization software needed? No If above answer is yes Other visualization software Process Describe processes represented by the model The QUAL2K framework includes the following new elements: Software Environment and Interface. Q2K is implemented within the Microsoft Windows environment. Numerical computations are programmed in Fortran 90. Excel is used as the graphical user interface. All interface operations are programmed in the Microsoft Office macro language: Visual Basic for Applications (VBA). Model segmentation. Q2E segments the system into river reaches comprised of equally spaced elements. Q2K also divides the system into reaches and elements. However, in contrast to Q2E, the element size for Q2K can vary from reach to reach. In addition, multiple loadings and withdrawals can be input to any element. Carbonaceous BOD speciation. Q2K uses two forms of carbonaceous BOD to represent organic carbon. These forms are a slowly oxidizing form (slow CBOD) and a rapidly oxidizing form (fast CBOD). Anoxia. Q2K accommodates anoxia by reducing oxidation reactions to zero at low oxygen levels. In addition, denitrification is modeled as a first-order reaction that becomes pronounced at low oxygen concentrations. Sediment-water interactions. Sediment-water fluxes of dissolved oxygen and nutrients can be simulated internally rather than being prescribed. That is, oxygen (SOD) and nutrient fluxes are simulated as a function of settling particulate organic matter, reactions within the sediments, and the concentrations of soluble forms in the overlying waters. Bottom algae. The model explicitly simulates attached bottom algae. These algae have variable stoichiometry. Light extinction. Light extinction is calculated as a function of algae, detritus and inorganic solids. pH. Both alkalinity and total inorganic carbon are simulated. The river’s pH is then computed based on these two quantities. Pathogens. A generic pathogen is simulated. Pathogen removal is determined as a function of temperature, light, and settling. Reach specific kinetic parameters. Q2K allows you to specify many of the *Weirs and waterfalls. The hydraulics of weirs as well as the effect of weirs and waterfalls on gas transfer are explicitly included. Describe key physical parameters and equations Too many to mention here. See manual. Describe length scale and resolution constraints -- Describe time scale and resolution constraints -- Describe any numerical limitations and issues -- Testing Describe available calibration data sets -- Upload calibration data sets if available: Describe available test data sets -- Upload test data sets if available: Describe ideal data for testing -- Other Do you have current or future plans for collaborating with other researchers? -- Is there a manual available? Yes Upload manual if available: Media:Q2KDocv2 11b8.pdf Model website if any http://www.epa.gov/athens/wwqtsc/html/qual2k.html Model forum / discussion board Comments Questionnaire is filled out by Albert Kettner Introduction History Papers Issues Help Input Files Output Files Download Source