CH3D (Curvilinear Hydrodynamics in 3 Dimensions) CH3D is a finite-difference model that computes three-dimensional velocity, salinity, and temperature fields in bays, estuaries, lakes, and rivers. Two basic versions of CH3D now exist. Both employ generalized curvilinear coordinates in the horizontal. One (CH3DZ) makes computations on a Cartesian (Z) vertical grid, whereas, the other employs a sigma-stretched vertical grid. All processes impacting the circulation of a large water body are modeled. These include turbulence, wind, tides, freshwater inflow, baroclinic forcing, and Coriolis effects. Various versions also contain sediment transport, e.g., CH3DSED (non-cohesive), CH3D-COSED (cohesive), and CH3DZ-FM (fluid mud). ADCIRC Hydrodynamic Model The 2- and 3-dimensional long-wave hydrodynamic model ADCIRC was developed for the specific purpose of simulating tidal circulation and tropical and extratropical storm surge propagation over large computational domains such as the entire East Coast of the United States, Caribbean Sea, and Gulf of Mexico, while simultaneously providing high resolution in areas of complex shoreline and bathymetry. The unstructured grid, finite element model represents all pertinent physics of the 3-dimensional equations of motion to include tidal potential, Coriolis, and nonlinear terms of the governing equations. The ADCIRC model also has internal capabilities for solving the 2-dimensional transport equations to simulate the movement and fate of both conservative and non-conservative constituents such as temperature, salinity, cohesive, and noncohesive sediment transport. The model has been extensively used along all coasts of the United States as well as numerous applications overseas. EST Statistical Life-Cycle Model The EST is a statistical procedure that simulates life-cycle sequences of non-deterministic multi-parameter systems such as storm events and their corresponding environmental impacts. The approach is based on a "Bootstrap" resampling-with-replacement, interpolation, and subsequent smoothing technique in which random sampling of a finite length database is used to generate a larger database. This procedure is repeated to generate a large population of life-cycle databases. These multiple databases of storm activity are post-processed to compute mean value frequency relationships with standard deviation error estimates. The model has been extensively used in conjunction with coastal process models to generate storm impact versus frequency-of-occurrence relationships. Typical storm impacts have included storm surge elevation, wave runup, dune recession, shoreline erosion, disposal mound erosion, and bridge scour. SED2D SED2D is a finite element model that computes separately the transport of cohesive or non-cohesive sediment in two horizontal dimensions using flows computed by RMA2. SED2D uses the same computational mesh as the RMA2 hydrodynamic model. SED2D can optionally use a variety of functions in transport calculations. Wind and waves can also be considered in calculations. TABS-MDS TABS-MDS is a finite-element numerical hydrodynamic model that computes sub-critical free-surface flows in three dimensions. It has a coupled transport module for computation of salinity and/or temperature for stratified flows. The model was originally developed as RMA10 by Resource Management Associates of Walnut Grove, CA, and enhanced and used extensively by the Coastal and Hydraulics Laboratory, ERDC, USACE (www.chl.erdc.usace.army.mil). A wide variety of element shapes can be employed to describe system geometries. TABS-MDS can also be used to compute separately the transport of cohesive sediments or coarse-grained sediments. TABS-MDS is used primarily in stratified flow situations. A variety of auxiliary schemes can be use for vertical and horizontal turbulence closure. FLOWSED FLOWSED is a one-dimensional model for computing unsteady flows in rivers and streams. Initially the model also computed sediment transport, resulting in the name FLOWSED. However, although the name has not been changed by the US Army Corps of Engineers, the sediment computations have been removed. FLOWSED is used on a daily basis by the US Army Corps of Engineers to predict flows and stages on the Ohio River and its tributaries. HEC-RAS The U. S. Army Corps of Engineers River Analysis System (HEC_RAS) is software that allows for one-dimensional steady and unsteady flow river hydraulics calculations. The HEC-RAS system contains one-dimensional hydraulic analysis components for: (1) steady flow water surface profile computations; and (2) unsteady flow simulation. In addition to the hydraulic analysis components, the system contains several hydraulic design features that can be applied once water surface profiles are computed. HEC-HMS The Hydrologic Modeling System (HEC-HMS) is designed to simulate the precipitation-runoff processes of dendritic watershed systems. It is designed to be applicable in a wide range of geographic areas for solving the widest possible range of problems. This includes large river basin water supply and flood hydrology, and small urban or natural watershed runoff. Hydrographs produced by the program are used directly or in conjunction with other software for studies of water availability, urban drainage, flow forecasting, future urbanization impact, reservoir spillway design, flood damage reduction, floodplain regulation, and systems operation. The modeling system features a completely integrated work environment including a database, data entry utilities, computation engine, and results reporting tools. A graphical user interface allows seamless movement between the different parts of the program. Program functionality and appearance are the same across all supported platforms. HSPF The Hydrologic Simulation Program Fortran (HSPF) simulates for extended periods of time the hydrologic, and associated water quality, processes on pervious and impervious land surfaces and in streams and well-mixed impoundments. HSPF uses continuous rainfall and other meteorologic records to compute streamflow hydrographs and pollutographs. HSPF simulates interception soil moisture, surface runoff, interflow, base flow, snowpack depth and water content, snowmelt, evapotranspiration, ground-water recharge, dissolved oxygen, biochemical oxygen demand (BOD), temperature, pesticides, conservatives, fecal coliforms, sediment detachment and transport, sediment routing by particle size, channel routing, reservoir routing, constituent routing, pH, ammonia, nitrite-nitrate, organic nitrogen, orthophosphate, organic phosphorus, phytoplankton, and zooplankton. HSPF is generally used to assess the effects of land-use change, reservoir operations, point or nonpoint source treatment alternatives, flow diversions, etc. GSSHA GSSHA (Gridded Surface and Subsurface Hydrologic Analysis) is a physically-based, distributed-parameter, structured grid, hydrologic model that simulates the hydrologic response of a watershed subject to given hydrometeorological inputs. The watershed is divided into cells that comprise a uniform finite difference grid. Processes that occur before, during, and after a rainfall event are calculated for each grid cell and the responses from individual grid cells are then integrated to produce the watershed response. Major components of the model include precipitation distribution, snowfall accumulation and melting, precipitation interception, infiltration, evapo-transpiration, surface water retention, surface runoff routing, channel flow routing, unsaturated zone modeling, saturated groundwater flow, overland sediment erosion, transport and deposition, and channel routing of sediments. Components under development at the US Army Engineer Research and Development Center in Vicksburg, MS include nutrients (carbon, nitrogen, and phosphorus) fate and transport, contaminants (chemicals, solids, and metals) fate and transport, and dynamic plant growth for nutrient and contaminant uptake and biomass generation. STFATE (Short-Term FATE) STFATE is a numerical model that computes the physical fate of dredged material from the moment it is released in open water from split-hull barges or hopper dredges until it is deposited on the bottom. Model output includes the depositional footprint of material on the bottom, time varying suspended sediment concentration in the water column, the impact force when material strikes the bottom, and spatially and time varying bottom shear stresses resulting from the bottom surge of dredged material. SSFATE (Suspended Sediment FATE) SSFATE is a model for predicting the far-field fate of dredged material at the dredging site. The basic model was developed by Applied Science Associates (asa@appsci.com) under funding through the Dredging Operations and Environmental Research Program (DOER) at the US Army Engineer Research and Development Center (ERDC) at Vicksburg, MS. Basic model outputs are depositional footprints and time varying suspended sediment concentrations in the water column. PDFATE (Pipeline Disposal FATE) PDFATE is a companion model to SSFATE or can be used independently to compute the spreading of pipeline disposed fine-grained sediments in shallow water. PDFATE was developed by the Coastal and Hydraulics Laboratory, ERDC, USACE (www.chl.erdc.usace.army.mil ). Underflow spreading is computed from the point of bottom attachment down slope. Lateral spreading, entrainment of overlying water, and settling and deposition of the underflow are included. Model output includes the underflow footprint if spreading is limited or the underflow trajectory and dimensions if spreading is not limited. In addition, the model computes suspended sediment conditions. These results can then be input to SSFATE for far-field dispersion calculations. CE-QUAL-RIV1 CE-QUAL-RIV1 is a one-dimensional (cross-section averaged), finite difference hydrodynamic and water quality model developed by Ohio State University and the U.S. Army Engineer Research and Development Center. The model resolves longitudinal variations in hydraulic and water quality characteristics and is applicable where lateral and vertical variations are small. The model can handle branching stream systems with hydraulic control structures. CE-QUAL-RIV1 consists of two codes, hydraulic routing (RIV1H) and water quality (RIV1Q). The hydraulic routing code is applied first to predict flows and stages needed for transport and results are written to a file which is then read by the water quality model. RIV1 can be used to predict transient hydraulic and water quality conditions in streams and rivers with highly unsteady flows, as well as predictions under steady flow conditions. RIV1Q can simulate up to twelve state variables including temperature, carbonaceous biochemical oxygen demand (CBOD), total organic nitrogen, ammonia nitrogen, nitrate + nitrite nitrogen, dissolved oxygen, total organic phosphorus, dissolved phosphates, algae, dissolved iron, dissolved manganese, and coliform bacteria. In addition, the impacts of macrophytes can be simulated. CE-QUAL-ICM The CE-QUAL-ICM is a multi-dimensional, finite volume, water-quality-ecological model that was originally developed to study eutrophication and related management strategies for Chesapeake Bay ecosystem. The model can be applied in 1, 2, 3, and mixed dimensional representations of surface water systems. The model has been applied to many other systems, including Inland Bays of Delaware, New York Bight, Newark Bay, New York - New Jersey Harbors and Estuaries, Lower Green Bay, Los Angeles - Long Beach Harbors, San Juan Bay and Estuaries, Florida Bay, Lower St. Johns River, and Lake Washington, WA. ICM is typically supplied flow information from a separate hydrodynamic code. ICM can be linked to any type of hydrodynamic model since it uses an unstructured, finite volume grid and solution scheme. ICM can simulate over 40 water quality and biological state variables, including salinity, temperature, dissolved oxygen, suspended sediment, various nutrient forms, multiple algal and submerged aquatic vegetation groups, zooplankton, and benthic organisms. The model also has a predictive diagenetic sediment sub-model that interacts with the water column and computes sediment oxygen demand and nutrient fluxes. ICM is considered the state-of-the-art today for science-based, mechanistic modeling of surface water quality and ecological components. A version of ICM has been extended to include toxic chemicals. CE-QUAL-W2 CE-QUAL-W2 is a two-dimensional, laterally averaged, finite difference hydrodynamic and water quality model for surface water. Because the model assumes lateral homogeneity, it is best suited for relatively long and narrow water bodies exhibiting longitudinal and vertical water quality gradients. The model can be applied to lakes, reservoirs, and estuaries, and practically any type of surface water system where the lateral homogeneity is a reasonable assumption. The model includes branching capabilities and has a vertical coordinate transformation that allows it to also be applied to streams, making it ideal for application to river basins with multiple reservoirs and inter-connecting stream reaches. The model accommodates variable grid spacing (segment lengths and layer thicknesses) so that greater resolution in the grid can be specified where needed. The water quality portion of the model includes temperature, salinity, TDS, suspended sediment, dissolved oxygen, the major eutrophication-related variables and nutrients, and multiple algal groups. The bottom sediment compartment stores settled particles, releases nutrients to the water column, and exerts sediment oxygen demand. W2 has been used extensively for reservoirs around the United States and world, and is considered the preferred model of choice for reservoir water quality. The model can accurately simulate reservoir density-dependent flow and stratification, as well as temperature and water quality conditions. WASP (Version 7) WASP7 predicts water quality responses to natural phenomena and manmade pollution for varying pollution management decisions. It is a dynamic compartment-modeling program for aquatic systems, including the water column and the underlying benthos. WASP7 allows the user to investigate 1, 2, and 3 dimensional systems, and a variety of pollutant types, including conventional pollutants (nitrogen, phosphorus, BOD, sediment oxygen demand, algae, and periphyton) and their effect on DO, organic chemicals, metals, mercury, pathogens, and temperature. It can be linked with hydrodynamic and sediment models to provide flows, depths, velocities, temperature, salinity, and sediment fluxes. ADH (Beta Testing) ADH is an ADaptive Hydraulics Modeling system developed by the Coastal and Hydraulics Laboratory, ERDC, USACE (www.chl.erdc.usace.army.mil) for both saturated and unsaturated groundwater, overland flow, three-dimensional Navier-Stokes flow, and two- or three-dimensional shallow water problems. Adaptive numerical meshes can be employed to improve model accuracy. The ADH module tested by CHT is the two dimensional model used for sediment transport. Multiple coarse grain classes can be simultaneously computed. CCHE2D (Beta Testing) CCHE2D is a two-dimensional finite element, unsteady, turbulent river flow, sediment transport, and water quality evaluation model developed at the University of Mississippi (www.hydra.cche.olemiss.edu). CHT personnel are currently involved in beta testing of CCHE2D. It is anticipated that CCHE2D will become a valuable model in CHT’s modeling toolbox. Computational Hydraulics and Transport LLC. 2006.