AQUATOX versions

v3.1 [Sep 3, 2010]
-Addition of sediment-diagenesis "steady-state" mode to significantly increase model speed;
-Modification of denitrification code in order to simplify calibration and to achieve alignment with other models;
-Enabled importation of equilibrium CO2 concentrations to enable linkage to CO2SYS and similar models;
-New BOD to organic matter conversion relying on percent-refractory detritus input; input and output BOD is clarified to be "carbonaceous" BOD.
-Refinements for floating plants:
-Added floating option for plants other than cyanobacteria (formerly labeled "blue-green algae”)
-Converted the averaging depth for floating plants to the top three meters to more closely correspond to monitoring data
-Floating plants now explicitly move from the hypolimnion to the epilimnion when a system is stratified.
-Modifications to PFA (perfluoroalkylated surfactants) model to increase flexibility:
-Uptake rates (K1s) and elimination rates (K2s) are visible and editable for animals and plants
-New interface to estimate animal K1s and K2s as a function of chain length
-Improved gill-uptake equation for invertebrates.
-Bioaccumulation and toxicity modeling improvements:
-Optional alternative elimination-rate estimation for animals based on Barber (2003) ; works best with PCBs;
-Updated ICE (toxicity regressions), based on new EPA models released in February 2010 and improved AQUATOX ICE interface;
-Addition of output of K1, K2, and BCF estimates.
-Improved sensitivity and uncertainty analyses:
-"Output to CSV" option for uncertainty runs so that complete results for every iteration may be saved and examined;
-Option for non-random sampling for "statistical sensitivity analyses";
-A "reverse tornado" diagram (effects diagram) that shows the effects of each parameter change on the overall simulation;
-Nominal range sensitivity analysis has been added for linked- segment applications.
-Database Improvements:
-AQUATOX database search functions dramatically improved;
-"Scientific Name" field added to Animal and Plant databases.
-Software and software installer is 64-bit OS compatible;
-Added an option in the "Setup" screen to trigger nitrogen fixation based on the N to P ratio;
-Addition of output variables to clarify whether photosynthesis is sub-optimal due to high-light or low-light conditions;
-Time-varying evaporation option in the "Site" screen has linkage from the "Water Volume" screen;
-Grid mode within a study so that all animal, plant, and chemical parameters in a study can be tabulated, examined, edited, and exported to Excel;
-Added capability to input time-series loads of fish based on fish stocking;
-Updated HSPF WDM file linkage to be more generally applicable (does not require use of WinHSPF, the version of HSPF contained in BASINS);
-Enabled hourly loadings for the following variables: all nutrients, CO2, Oxygen, Inorganic suspended sediments (sand/silt/clay), TSS, Light, Organic Matter;
-"Graph Setup" window now enabled for linked-mode graphics;
-Other minor interface improvements.