Hydrodynamic Eutrophication Model (HEM-3D) from Virginia Institute of Marine ScienceEntry ID: VIMS_HEM3D
Abstract: Scientists at the Virginia Institute of Marine Science (VIMS),
Department of Physical Sciences, have developed a general purpose,
three-dimensional numerical model which is an integration of a hydrodynamic
model, a sediment transport model, and a water quality(eutrophication)
model. The model can be applied to a wide variety of environmental
problems and can operate at a variety of temporal and ... spatial scales
in coastal embayments, estuaries and tributaries.
The 'domain' of the model (area of coverage) can vary from entire
embayments (e.g., the Chesapeake Bay and all its tributaries) to
individual river estuaries (e.g., the James, York and Rappahannock
Rivers in Virginia). To implement the HEM-3D model, a gridwork of 'cells'
must be constructed that accurately fits the plan-view outline of the
water body and a depth for each cell must be added from bathymetric surveys.
Coarse-grids in large embayments use fewer cells relatively large
in size to achieve low or moderate resolution. Fine-grids in small
estuaries use many small cells where high resolution is important
(e.g.,release of point source materials).
A Coarse grid Hydrodynamic Eutrophication Model (HEM-3D) has been
developed covering the entire Chesapeake Bay and its tributaries.
This model can be used to predict tide, current and salinity
distributions at low resolution throughout the Bay. It can also be used to
investigate eutrophication processes (water quality) and the transport
of water-borne materials anywhere within the Bay.
A high-resolution, fine-grid HEM-3D model has been used to study
detailed temporal and spatial change (including stratification and
de-stratification) in the salinity regime of the lower York River.
Shellfish larval transport and eutrophication processes are also
being investigated here. The fine-grid model for the York has a merged
Cartesian-curvlinear grid of more than 3200 cells. The grid size is
250 m by 250 m in the Cartesian portion (lower York) and 250 m to
1000 m in the curvlinear portion (upper York).
[This information was adapted from VIMS Physical science page.]
(Click for Interactive Map)
TERRESTRIAL HYDROSPHERE > WATER QUALITY/WATER CHEMISTRY > NUTRIENTS
TERRESTRIAL HYDROSPHERE > WATER QUALITY/WATER CHEMISTRY > ORGANIC MATTER
OCEANS > BATHYMETRY/SEAFLOOR TOPOGRAPHY > WATER DEPTH
OCEANS > COASTAL PROCESSES > ESTUARIES
OCEANS > COASTAL PROCESSES > SEDIMENT TRANSPORT
OCEANS > COASTAL PROCESSES > SEDIMENTATION
OCEANS > SALINITY/DENSITY > SALINITY
OCEANS > TIDES > TIDAL CURRENTS
Creation and Review Dates
DIF Creation Date: 1999-11-05
Last DIF Revision Date: 2005-10-14