1. General Model Information

Name: Caernarvon Diversion Landscape Spatial Simulation

Acronym: CADILSS

Main medium: aquatic+terrstrial
Main subject: Habitat succession, other, hydrology, population dynamics
Organization level: Landscape, Ecosystem
Type of model: partial differential equations (finite differences,2D)
Main application: research, education, decision support/expert system
Keywords: Caernarvon, Breton Sound, river diversions, wetland succession


Enrique Reyes
Dept. of Geology and Geophysics, University of New Orleans, New Orleans, LA 7018, USA
Phone: 504 280 6790
Fax: 504 280 7396
email: ereyes@uno.edu


Enrique Reyes, John W. Day, Vibhas Aravamuthan


Extensive habitat changes have occurred in coastal Louisiana including land loss, displacement of freshwater vegetation by salinity tolerant communities, and diminishing fisheries production. We developed an ecological model that integrates present environmental conditions, mimics several event pulsing scenarios, such as different river diversion deliveries and hurricane-related tidal intrusions, and evaluates watershed health through long-term scenarios. This model consisted of a grid of spatially articulated unit models (14,806 active cells) that interact hydrological and ecologically. For calibration purposes, the spatial model was initialized under 1978 environmental conditions and run for 10 years. The calibration exercise was determined satisfactory, once the comparative fit index between the 1988 habitat map and the resulting map reached 94.1 (out of a scale of 100). The model results indicated a slight tendency of the model to overcompensate for freshwater inputs in the form of precipitation, but the model provides an accurate representation of historical conditions. A favored mitigation measure includes incrementing freshwater discharge through the Caernarvon Diversion in response to real-time salinity monitoring. A series of alternative management scenarios were tested for future conditions (50 years) with several scenarios that included: no freshwater discharge, historical scheduled discharge (normal Caernarvon Diversion discharge 1991-2000), and water discharge under the 2001 and 2002 PULSES schedule scenarios. Results indicated that freshwater inputs to the watershed consistently precluded land loss. The scenarios with freshwater discharge seem to contribute to maintain the favorable conditions for these ecosystems.

II. Technical Information

II.1 Executables:

Operating System(s): LINUX

II.2 Source-code:

Programming Language(s): Fortran 90

II.3 Manuals:

II.4 Data:

III. Mathematical Information

III.1 Mathematics

III.2 Quantities

III.2.1 Input

III.2.2 Output

IV. References

V. Further information in the World-Wide-Web

VI. Additional remarks

Last review of this document by: : Wed Oct 16 20:35:23 2002
Status of the document: Contributed by Enrique Reyes
last modified by Joachim Benz Thu Oct 24 17:43:55 CEST 2002

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