Latin American and Caribbean Consortium of Engineering Institutions

Conference Track:  Engineering & Public Service

Selection1:       Panel

Language:         English

Keywords:         Water Quality, Models, Estuarine

Contact Title::    Dr.

Contact First Name: Barry

Contact Last Name:  Bunch

University:       Engineer Research and Development Center

Web:              http://www.wes.army.mil/el/

Position:         Supervisory Research Civil Engineer

Country:          United States of America

Email:            Barry.w.Bunch@erdc.usace.army.mil

Fax:              (601) 634-3129

Selection:        Only IF PAPER ACCEPTED

Submit:           Submit

Date:             Tuesday, March 30, 2004

Time:             10:24:12 AM

Paper Title:

Water Quality Modeling of San Juan Bay Estuary

Abstract:

Three-dimensional coupled hydrodynamic and water quality models were used in a study of the San Juan Bays (Puerto Rico) Estuarine System.  Hydrodynamic information was supplied by CH3D and water quality computations were performed by CEQUAL-ICM.  Both models were calibrated using data collected during 1995. A complete suite of water quality state variables including dissolved oxygen, temperature, salinity, nutrients, and coliforms were simulated. Once both models had demonstrated their applicability, they were used to simulate proposed modifications to the system.  The objective of these modifications was to improve water quality conditions in differing portions of the system.  Ten simulations were performed during this phase.  Items simulated consisted of the removal of point source and non-point source loadings, filling of submerged borrow pits, channel deepening and widening, and effectiveness of tidal gate induced circulation.  Results indicated that water quality in the!

 interior component of the estuarine system, San Jose Lagoon could be improved by widening and deepening Cano Martin Pena, its connection to San Juan Bay and also by filling borrow pits.  Over time the accumulation of organic material in the pits, combined with limited vertical exchange with the overlying waters, created anoxic conditions in the pit.  These conditions resulted in the pit being a net source of ammonia and dissolved inorganic phosphorus to the system.

Mailing Address:

Water Quality and Contaminant Modeling Branch

Environmental Laboratory

Engineering Research and Development Center

3909 Halls Ferry Road

Vicksburg, MS 39180