Download Oceanographical modelling in Cuba. State of its coupling

A GODAE Summer School
AN INTEGRATED VIEW OF OCEANOGRAPHY: Ocean Weather Forecasting in the 21st Century
Amilcar E. Calzada Estrada1, José M. Marín Antuña2, Eugenio Mojena López1, Osvaldo Enrique Pérez López1.
1. - Institute of Meteorology, Cuba, [email protected], [email protected], 2. - Universidad de la Habana, [email protected].
This work carries out an analysis of waters dynamic for seashores with economic importance in Cuba, such as interest bays and areas selected as natural reserve. The results are obtained from a hydrodynamic two-dimensional model that
is fed by real data and intermediate calculus. Multiple assessments are made throughout graphical and digital outputs that enrich details space-temporals from each zone. The platform currents field and sea surface high values are shown in
the entire mathematic domain. A Geographic Information System is used as a useful tool in the confection of the proposed scenarios. A method able to describe significant physical processes in the oil slick on the sea is applied with a
Lagrangiane focus. For its operation, the processing of meteorological satellite images is explained as a necessary tool in order to be incorporated to the model. As a result of its use, the analysis of sea superficial temperature at the Gulf of
Mexico, Caribbean Sea and Bahamas is offered. In addition the temperature field will facilitate the characterization of the present sea currents. Finally, it is mentioned the software used for detecting, activating the specialist’s group and
monitoring the affected area once the accident is detected.
CALCULATION OF THE FIELD OF MARINE CURRENTS
A careful study of oil tanker traffic frequency in the marine area, along with low depth of
waters adjacent to the channels and counter – sense wind and current conditions, brought
as a result a high hazard assessment in navigational conditions of San Nicolas’ Canal and
Old Bahamas’ Channel. This favors the occurrence of oil tankers accidents and sinking
during its tracks.
-
In connection with the world traffic
BAHAMAS CHANNEL
8
6.8
Elaboration of the grid in combination with SPRING (GIS).
Conformation of the physical model to employ.
Working with PHOENICS.
Data input.
Working with OILTRACK.
Dynamic analysis of the area.
6
4
2
1.8
SIMULATION OF HYDROCARBONS TRANSPORT IN THE SEA
0
millions of barrels
percent
- Choise of focus type (Lagrangian or Eulerian).
- Data analysis and input (nature of the spill, initial volume of the slick,
hydrometeorological conditions, physical – chemical characteristics of hydrocarbon,
etc).
- Perform the model run.
► (Lagrangian focus) Decomposition the slick in particles.
► (Eulerian focus) Analysis of the advection – diffusion equation.
- Analysis of the simulation and answers to propose.
- Model runs including the answers.
In connection with the world traffic
YUCATAN CHANNEL
10
8.3
8
6
4
2.2
2
0
millions of barrels
percent
Figure 1.- Maps of the Cuban
adjacent coasts.
a). Physical Map
b). Example of Wind Field.
c). Beginning of the Current of Golf.
VALIDATION OF THE MODEL WITH SATELLITE
TECHNICS AND FEEDBACK
- Analysis of speed error values in some points of the field.
- Assessing the slick position in relation with its prediction in a determined instant (t = t0).
- Impose to the model new conditions in predetermined time intervals, to guarantee its
rectification.
-Climate data [US]
- Navier – Stokes’s system equations. It is applied
- Forecast data [US]
to coastal zones.
- PHOENICS. Their processors take charge of
- Real time data
obtaining states of current speed fields in certain
instants.
 HYDROMETEOROLOGICAL
- OILTRACK. Starting from boundary conditions
• Mean sea level (tides) [DM].
settled down by the previous model, it is possible to
simulate the marine current field, and consequently,
• Marine currents [DM & IS].
the trajectory of oil spill.
• Wind speed and direction [DM & M].
- Making the final analysis, important valuations
can be reached about the permanency of dynamic
• Sea surface and air temperatures [DM & IM].
processes.
• Sea state [DM & M].
 GEOGRAPHICAL
•Latitude where the accident occurred
• Bathymetry of the area.
 ADITIONAL DATA
• Kind of spill
• Physical – chemical features of hydrodynamic figure 2. - Grids used for the numerical processing.
environment.
Figura 3.- Calculus of the Marine Current Field and the Oil
Transport in Cárdenas Bay.
- Incompressible and Homogeneous.
[DM] – Direct Mensurations [US] – Under study
[IS] – Images of satellites
[M] – by Models
  1025
Kg
m3
  10  3
Ns
m2
g  9,78
NKg
m2
A meteorological database of NCAR & NCEP is processed
by means of GrADS system, whose analysis will be very
useful for the stochastic focus of the model.
Otherwise, it can access to oceanographic data of the
Caribbean Sea, Gulf of Mexico and Great Bank of Bahamas
obtained via internet.
Figura 4a. Thermal IR Image, with “RED
TEMPERATURE” application.
Figura 4b. Isothermic map of 14/04/88, 12.00 Z. It
shows hot water intrusion on the north coast of Cuba.
- Location and characterization of marine currents surrounding Cuba.
- Take into account the details of sea surface temperature field (magnitude of warm water intrusion).
- Preparation of sea surface thermal charts.
- Confection of the software SPILL to detect possible oil spills.
FUTURE SCENARIOS TO STUDY
• Main Cuban bays.
• The most vulnerable areas of Cuban insular platform.
• Areas of economic interest on deep waters.