1. General Model Information
Name: RECONstruction of velocity and concentration field. Estimation of mass balance, point and diffuse inputs.
Main medium: all
Main subject: biogeochemistry, (eco)toxicology
Organization level: Ecosystem, Population
Type of model: partial differential equations (finite elements), partial differential equations (finite differences,3D)
Keywords: velocity field, concentration field, diffuse sources, inverse methods
Dr. Tarzan Legovic
Center for Marine Research, R. Boskovic Institute, P.O.Box 1016, HR-10001 Zagreb, Croatia.
phone: +385 1 46 80 230
fax: +385 1 46 80 084
T. Legovic, N. Limic, R. Benis, B. Tomas, D. Kasum
Given geometry of the region ( bay, coastal sea, lake or any other piece
of bounded environment)and incomplete data on velocity (optional) and
measurements of concentrations at some locations and, possibly incomplete,
data on locations (or at least indications) of sources, RECON is designed
to solve following problems:
a) obtain the velocity field;
b) obtain concentration field of the studied
c) estimate intensity and location of point and diffuse
d) compute complete mass balance of the substance;
simulations with modified sources; and
f) obtain optimum distribution
of sources to produce desirable concentration field.
In order to solve the above problems RECON uses a combination of direct
and inverse modelling methods for partial differential equations.
In case the studied substance is a pollutant, using RECON one finds the
optimum management scheme of sources so that a pollution at any given
location in the studied area does not overcame an in advance specified
RECON may be used in environmental mapping, planning and discovery of
unknown location and intensity of sources be they point or diffuse.
The advantage of using RECON is that it can solve the above problems
where other packages fail due to scarcity of data.
II. Technical Information
Operating System(s): MS-DOS
Please contact T. Legovic by mail or e-mail.
Programming Language(s): Please contact T. Legovic by mail or e-mail. C, FORTRAN Please contact T. Legovic by mail or e-mail.
Please contact T. Legovic by mail or e-mail. RECON User's Manual Please contact T. Legovic by mail or e-mail.
Please contact T. Legovic by mail or e-mail. A) One input file which contains: 1) Geometry (mandatory), 2) whatever is available from the following: current (velocity) measurements, measurements of concentrations, an estimate of the background concentration (i.e. far from sources), location and intensity of known sources, location of unknown sources. B) Some quantitative or qualitative condition(s) on desired concentration field.
III. Mathematical Information
See references below.
velocity field, concentration field, inflows, turbulentdiffusion, interaction terms ( extinction ).
See under Data.
1) Figures of geometry of the studied region with:
a) data on currents and
b)data on concentrations.
2) Figures of the current field in the whole region or any subregion;
3) On screen investigation of the details of the current field using all or any subset of existing data.
4) Concentration field following presently existing sources.
5) Concentration field due to any combination of sources including the the optimum field which satisfies given conditions.
6) Output file containing all relevant data including statistics on reliability of results.
There are 12 references in internat. sci. journals and 13references in conference reports on methods and applications of RECON.
Legovic T. Modelling for Seawater Quality Management. J. Computing and Information Technology, 5(1997), 71-85.
Legovic T. Toxicity may affect predictability of eutrophication models in coastal sea. Ecological Modelling, 99(1997), 1-6.
Legovic T. et al., Towards the optimum management of total suspended solids in coastal sea: The case of Izmit Bay, Marmara Sea. Croatica Chemica Acta, 70(1997), 373-388.
Legovic T., Limic N. and Valkovic V., Estimation of diffuse inputs of substances to a coastal sea. Estuarine, Coastal and Shelf Sci., 30(1990), 619-634.
Legovic T. and Limic N., A method to estimate diffuse inflow of freshwater into a coastal sea. Appl. Mathematical Modelling, 13(1989), 242-247.
V. Further information in the World-Wide-Web
Recon Home Page
VI. Additional remarks
Last review of this document by: Dr. Tarzan Legovic Tue Mar 24 21:17:48 1998
Status of the document: Contributed by T. Legovic
last modified by
Tobias Gabele Wed Aug 21 21:44:48 CEST 2002