Model:QUAL2K: Difference between revisions
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|Spatial dimensions=1D | |Spatial dimensions=1D | ||
|Spatialscale=Watershed-Scale | |Spatialscale=Watershed-Scale | ||
|One-line model description=A Modeling Framework for Simulating River and Stream Water Quality | |One-line model description=A Modeling Framework for Simulating River and Stream Water Quality | ||
|Extended model description=QUAL2K (or Q2K) is a river and stream water quality model that is intended to represent a modernized version of the QUAL2E (or Q2E) model (Brown and Barnwell 1987). Q2K is similar to Q2E in the following respects: | |Extended model description=QUAL2K (or Q2K) is a river and stream water quality model that is intended to represent a modernized version of the QUAL2E (or Q2E) model (Brown and Barnwell 1987). Q2K is similar to Q2E in the following respects: | ||
One dimensional. The channel is well-mixed vertically and laterally. | One dimensional. The channel is well-mixed vertically and laterally. | ||
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|Other program language=Visual Basic (VBA), Excel | |Other program language=Visual Basic (VBA), Excel | ||
|Code optimized=Single Processor | |Code optimized=Single Processor | ||
|Start year development=1987 | |||
|Does model development still take place?=Yes | |Does model development still take place?=Yes | ||
|Model availability=As code | |Model availability=As code | ||
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}} | }} | ||
{{Input - Output description | {{Input - Output description | ||
|Describe input parameters=Too many to mention here | |||
|Describe output parameters=-- | |||
|Pre-processing software needed?=No | |Pre-processing software needed?=No | ||
|Describe pre-processing software=-- | |||
|Post-processing software needed?=No | |Post-processing software needed?=No | ||
|Describe post-processing software=-- | |||
|Visualization software needed?=No | |Visualization software needed?=No | ||
}} | }} | ||
{{Process description model}} | {{Process description model | ||
{{Model testing}} | |Describe processes represented by the model=The QUAL2K framework includes the following new elements: | ||
{{Users groups model}} | |||
*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=-- | |||
}} | |||
{{Model testing | |||
|Describe available calibration data sets=-- | |||
|Describe available test data sets=-- | |||
|Describe ideal data for testing=-- | |||
}} | |||
{{Users groups model | |||
|Do you have current or future plans for collaborating with other researchers?=-- | |||
}} | |||
{{Documentation model | {{Documentation model | ||
|Provide key papers on model if any=-- | |||
|Manual model available=Yes | |Manual model available=Yes | ||
|Model manual=Q2KDocv2 11b8.pdf, | |Model manual=Q2KDocv2 11b8.pdf, | ||
|Model website if any=http://www.epa.gov/athens/wwqtsc/html/qual2k.html | |Model website if any=http://www.epa.gov/athens/wwqtsc/html/qual2k.html | ||
}} | }} | ||
{{Additional comments model}} | {{Additional comments model | ||
|Comments=Questionnaire is filled out by Albert Kettner | |||
}} | |||
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==Introduction== | ==Introduction== |
Revision as of 18:47, 17 November 2009
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 |
Phone | |
Fax |
Name | Greg Pelletier |
Type of contact | Model developer |
Institute / Organization | |
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Name | Hua Tao |
Type of contact | Model developer |
Institute / Organization | |
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QUAL2K
Metadata
Summary
Technical specs
In/Output
Process
Testing
Other
IntroductionHistoryPapersIssuesHelpInput FilesOutput FilesDownloadSource |