Stram, D. L. Graduate School of Oceanography, University of Rhode Island, dstram@gso.uri.edu
Kincaid, C. L. Graduate School of Oceanography, University of Rhode Island, kincaid@lighthouse.gso.uri.edu
Campbell, D. E. US Environmental Protection Agency, Atlantic Ecology Division, campbell.dan@epamail.epa.gov
Martinez, R. Instituto Oceanografico de la Armada (INOCAR),

 
NUMERICAL MODELING OF ANTHROPOGENIC IMPACTS ON THE RIO CHONE ESTUARY, ECUADOR
 
The Rio Chone estuary in Ecuador has been heavily altered since 1890 by anthropogenic impacts, e.g. shrimp mariculture. Results are presented from a combined field and modeling study to investigate factors leading to decreased water quality in the estuary. Computational experiments utilize both hydrodynamic and shrimp pond models. This work represents a multi-institutional collaboration between U.S. universities, federal labs and two Ecuadorian agencies. A two-dimensional, laterally-averaged model is employed to characterize circulation and residence time in the estuary. This model solves the shallow water equations for the flow and mixing of water and salt subject to a range in forcing conditions. Residence time of water in the estuary and point sources from shrimp ponds are modeled using Lagrangian particles. Results for model runs calibrated from wet season data indicate that residence time has increased over the last century due to bathymetric alterations and long-term trends in decreased freshwater input. Results from pond models relating shrimp production to water quality indicate that effluents from ponds more than nine kilometers from the mouth are not being flushed well enough to enable maximum shrimp production during the dry season. Coupled modeling scenarios will ultimately be used to recommend management decisions in the area.
 
Day: Wednesday, Feb. 3
Time: 08:45 - 09:00am
Location: Sweeney Center
 
Code: SS08WE0845S