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Windows |
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v1.00 |
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Dec. 1, 2003 |
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Yes |
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USEPA |
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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:
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- One dimensional. The channel is well-mixed vertically and laterally.
- Steady state hydraulics. Non-uniform, steady flow is simulated.
- Diurnal heat budget. The heat budget and temperature are simulated
as a function of meteorology on a diurnal time scale.
- Diurnal water-quality kinetics. All water quality variables
are simulated on a diurnal time scale.
- Heat and mass inputs. Point and non-point loads and abstractions are simulated.
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QUAL2K is designed to handle typical surface water quality components such as
aquatic biology, assessment, compliance, discharge, environmental effects, hydrology,
NPS related, NPDES, point source(s), surface water, test/analysis and TMDL related
analysis.
It simulates conventional Pollutants (Nitrogen, Phosphorus, Dissolved Oxygen,
BOD, Sediment Oxygen Demand, Algae), pH, Periphyton and Pathogens.
The QUAL2K framework includes the following new elements:
- Software Environment and Interface -- Q2K is implemented
within the Microsoft Windows environment. It is programmed in
the Windows macro language: Visual Basic for Applications (VBA).
Excel is used as the graphical user interface.
- Model segmentation -- Q2E segments the system into river reaches comprised
of equally spaced elements. In contrast, Q2K uses unequally-spaced reaches.
In addition, multiple loadings and abstractions can be input to any reach.
- 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). In addition,
non-living particulate organic matter (detritus) is simulated. This
detrital material is composed of particulate carbon, nitrogen and
phosphorus in a fixed stoichiometry.
- 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 are 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.
- 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 simulated based onthese two quantities.
- Pathogens -- A generic pathogen is simulated. Pathogen removal
is determined as a function of temperature, light, and settling
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File (Windows ME/2000/XP / MS Office 2000 or Higher ) |
Size |
Download |
QUAL2K Self Extracting Windows Installation File |
4.3 MB |
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