Metocean Conditions at Santos and Campos Basins

Metocean Conditions at Santos and Campos Basins

Metocean Conditions at
Santos and Campos Basins
Eric Oliveira Ribeiro
Environmental Analyst
CENPES/PDEP/TEO
[email protected]
November 11th, 2013
Metocean Conditions in Santos
and Campos Basins
Introduction
Santos and Campos Basins
Wave Data Base
Wave Climate in Santos Basin
Spectral Bimodality
Extreme Wave Values
Considerations about Wave Conditions
Santos and Campos Basins Currents
CENPES/PDEP/TEO
Wave Climate in Santos and
Campos Basins
Generation of waves depends on:
High and Low Pressure Centers
Cold front systems (Cyclone and Anticyclone)
Fetch – horizontal area that wind blows
Wind speed – horizontal velocity ofthe flow
Wind Duration - Time that wind lasts
Let’s see the following example at Santos Basin:
CENPES/PDEP/TEO
Finding a Wave Source
Santos Basin
Low Pressure Center
Cyclone
High Pressure Center
Anti-Cyclone
CENPES/PDEP/TEO
Finding a Wave Source
Potential Fetch
CENPES/PDEP/TEO
Santos and Campos Basins
Data Base
Modeling Results
COPAS (10 years of WW3 - NOOA)
BOMOSHU (20 years – Oceanweather Inc.)
In-situ Data
Buoys (~ 3 years)
Wave Radars ( ~5 years)
Blended time-series substantiates the Analysis
CENPES/PDEP/TEO
Wave Climate in Santos Basin
Sea States at Santos Basin
CENPES/PDEP/TEO
Wave Climate in Santos Basin
Mean Summer wind field
NE source – Wind seas
•Atlantic Semi-Permanent High Pressure Center
• Hs = 0 - 5.5 m; Tp = 3-12 s; 27.44 %
CENPES/PDEP/TEO
Wave Climate in Santos Basin
Wind and pressure field from 25/Aug/1992 00:00
S source –Swell
• Low pressure center (Cold Front)
• Hs = 0 - 8 m; Tp = 3-21 s; 22.00 %
CENPES/PDEP/TEO
Wave Climate in Santos Basin
Wind and pressure field from 02/Jul/2008 00:00
SW source – Swell
• Extratropical Low High Pressure Center (Cold Front)
• Hs = 0 – 9.5 m; Tp = 3-19 s; 8.00%
CENPES/PDEP/TEO
Wave Climate in Santos Basin
Bimodality
14.7s
6.25 s
CENPES/PDEP/TEO
Wave Climate in Santos Basin
Bimodality
14.7s
6.65 s
CENPES/PDEP/TEO
Wave Climate in Santos and
Campos Basin Bimodality
Unimodal
Bimodal
BC
44%
56 %
Santos
40%
60%
CENPES/PDEP/TEO
Wave Climate in Santos Basin
Extreme Values
Usually unimodal
CENPES/PDEP/TEO
Wave Climate in Santos and Campos Basin
Extreme Values
CENPES/PDEP/TEO
Wave Climate in Santos and
Campos Basin Considerations
The mode of Brazilian southeast wave climate is ~2.0 m
while in GOM the mode is 0.75 m
Santos Nothern waves are less frequent than in
Campos Basin due to shoreline
Santos swell is more energetic than Campos due to the
proximity of source.
CENPES/PDEP/TEO
Santos and Campos Basin Currents
CENPES/PDEP/TEO
Santos and Campos Basin Currents
width ~75 km
depth ~ 200 m
continental Shelf
width ~40 km
depth 200 – 2500 m
Continental slope
continental
rise
CENPES/PDEP/TEO
Santos and Campos Basin Currents Data Base
Modeling Results
Hycom (10 years – REMO)
ROMS (10 years – REMO)
In-situ Data
Metocean Moorings (~ 10 years)
(ENG-E&P/PROJEN/EDSG/GEO)
Float Unit productions with Equipments (~10 years)
(OCEANOP -E&P-SERV/US-SUB/GDS/OCN )
Blended time-series substantiates the Analysis
Movie
CENPES/PDEP/TEO
Santos and Campos Basin Currents
Brasil Current
(toward South)
Intermediária
counter-current
(toward North)
Deep Western
Boundary Current
(toward South)
Vertical profile of
N-S component
(-) south
(+) north
CENPES/PDEP/TEO
Santos and Campos Basin Currents
CENPES/PDEP/TEO
Santos and Campos Basin Currents
Surface Current, Campos Basin
Surface Current, Santos Basin Pre-Salt
CENPES/PDEP/TEO
Santos and Campos Basin Bottom Currents
Bottom currents depend on:
Bathimetry
Canyons
Type of soil
Flow
Impotant to:
Free spans on pipelines
Subsea design settings
CENPES/PDEP/TEO
Santos and Campos Basin Bottom Currents
CENPES/PDEP/TEO
Considerations about Santos and
Campos Basin Currents
Despite the Santos basin is located in a Western bondary
current region its vertical structure doesn’t ressemble
exactly the same at Campos basin.
The regime in the Santos Basin Pre-Salt is more
influenced by meanders, vortices than by the mean flow.
In the both basins the relative strongest currents are at
surface ~1.5 m/s southward.
The intense bottom currents (~0.3-0.6 m/s) depend on
the local bathymetric and oceanographic conditions and
cannot be considered in a regional scale.
CENPES/PDEP/TEO