IMPACT OF DREDGING PROCESSES IN TURBIDITY OF SEMI- ... Starting data and scenarios ... Dispersion of sediments in the water column during dredging.
IMPACT OF DREDGING PROCESSES IN TURBIDITY OF SEMIENCLOSED WATER BODIES: APPLICATION TO BAY OF CARTAGENA DE INDIAS (COLOMBIA) Javier García Alba*, J.F. Bárcena, A. García , B. Pérez-Díaz, P. Núñez, S. Castanedo, R. Medina ENVIRONMENTAL HYDRAULICS INSTITUTE “IHCANTABRIA”. UNIVERSIDAD DE CANTABRIA
Index 1. Why is this study necessary? 2. Starting data and scenarios 3. Turbidity analysis 4. Acknowledgements
1. Why is this study necessary? Natural barrier Colonial importance
Bay of Cartagena de Indias 17 km
Small tidal range
Natural source of sediments
9.5 km Tidal Prism= 16·106 m3
1. Why is this study necessary?
International seaborne trade
Investments in port infrastructure
Trade agreements
Adaptation and adjustment of the access channel to the Bay of Cartagena de Indias
ASSESSMENT!! Bay of Cartagena de Indias (Colombia)
Dispersion of sediments in the water column during dredging operations
2. Starting data and scenarios
Starting Data a)
Bathymetry
b)
Dique Channel
“Estudios e investigaciones de las obras de restauración ambiental y de navegación del Canal del Dique”, (UNAL, 2007)
2. Starting data and scenarios a)
Starting Data b)
Astronomic Tide
TOPEX model
b)
CFSR reanalysis system Atmopheric data (wind,pressure, Heat fluxes)
Wind data Rafael Nuñez Airport COADS05 database (Da Silva et al.)
Salinity and temperature
“World Ocean Atlas 2005” (WOA05) database
2. Starting data and scenarios
Scenarios Climate events
3. Turbidity analysis
Coupling
Methodology Delft3D (FLOW+MOR)
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4. Módulos de dragado
Draga de succión en marcha Initial Conditions
Bathimetry, bottom geophysics Dredging path Dredging area
Computational cell
IH-Dredge Methodology
3. Turbidity analysis
Methodology Flow dredged (solid flow) Dredging Path Max Limit Depth (objetive of this dredging)
-Dispersion of dredging losses and Dique cannel sediment contributions (same type of sediment)
t 0.01 kg/m3, is bigger for scenarios on the dry season due to hydrodynamic fenomena in the channel (higher outflow in that zone). -The discharge into the dump area has a very localized dispersion not reaching the dredging area or inside the bay.
-Dredging material losses affect a localized area in the dredging zone. While the dredge is working the SS concentration in this area due to its losses are greater than the concentration provide by Dique channel. During Niña year the SS concentration coming from Dique channel is much greater than the sediment contribution of the dredging process. On the dry season it is lightly smaller.
4. Acknowledgements
Acknowledgements -Aqua & Terra Consultores Asociados S.A.S. -Plan Nacional de I+D+i (2013) del Ministerio de Ciencia e Innovación (Proyecto CTM2012-32538). -CFSR (Climate Forecast System Reanalysis, The National Centers for Environmental Prediction NCEP). -Rafael Nuñez Airport (wind data). -“World Ocean Atlas 2005” (WOA05) database. -COADS05 database. -TOPEX/Poseidon System.
IMPACT OF DREDGING PROCESSES IN TURBIDITY OF SEMIENCLOSED WATER BODIES: APPLICATION TO BAY OF CARTAGENA DE INDIAS (COLOMBIA) Javier García Alba*, J.F. Bárcena, A. García , B. Pérez-Díaz, P. Núñez, S. Castanedo, R. Medina ENVIRONMENTAL HYDRAULICS INSTITUTE “IHCANTABRIA”. UNIVERSIDAD DE CANTABRIA
