southwest pass area examples of the known effects to navigation due to channel narrowing associated...
TRANSCRIPT
SOUTHWEST PASS AREA Examples of the Known Effects toExamples of the Known Effects to
Navigation Due to Channel NarrowingNavigation Due to Channel Narrowing
Associated Branch Pilots for the
Port of New Orleans
Associated Branch Pilots for the Port of Associated Branch Pilots for the Port of New OrleansNew Orleans
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A Pilots Perspective: Truth and Consequences
Truth: Mississippi River channel Truth: Mississippi River channel maintenance dredging is reducedmaintenance dredging is reduced
Consequences: Consequences:
1.1. Reduced safe passing distances for Reduced safe passing distances for shipsships
2.2. Reduced channel creates navigation Reduced channel creates navigation hazardshazards
3.3. A reduced channel equals cargo lossesA reduced channel equals cargo losses
Associated Branch Pilots for the Port of Associated Branch Pilots for the Port of New OrleansNew Orleans
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Existing Channel WidthsEntrance to the Mississippi RiverSouthwest Pass Area
Associated Branch Pilots for the Port of Associated Branch Pilots for the Port of New OrleansNew Orleans
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750’
650’
600’
Gulf
SWP Light
SWP Pilot StationJetties
Safe Passing Distance in Existing 650’ Channel
Associated Branch Pilots for the Port of Associated Branch Pilots for the Port of New OrleansNew Orleans
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Photo: Mississippi River Trade and Transport Council
Existing Safe Passing Separation Approximately 300’
300’
Associated Branch Pilots for the Port of Associated Branch Pilots for the Port of New OrleansNew Orleans
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Passing clearanc
e reduced
from 300’ to 195’
Effect of Narrowing From 750’ to a 650’ Channel
600’ Channel Narrowed to 500’
Associated Branch Pilots for the Port of Associated Branch Pilots for the Port of New OrleansNew Orleans
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500’ Channel
Narrowing
100’ Clearance Remaining
Narrowing to 400’ Channel
Associated Branch Pilots for the Port of Associated Branch Pilots for the Port of New OrleansNew Orleans
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400’ Channel
400’ channel
No safe passing distance
remaining
Associated Branch Pilots for the Port of Associated Branch Pilots for the Port of New OrleansNew Orleans
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50’ remaining passing distance
Wind: East @ 15kn
10 Degrees of Vessel Leeway in a Narrowed 500’ Channel
10 Degrees of Leeway in a 400’ Channel
Associated Branch Pilots for the Port of Associated Branch Pilots for the Port of New OrleansNew Orleans
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400’ Channel
Potential Collision
Wind: East @ 15kn
Crash Stop
In high current conditions, it often In high current conditions, it often takes nearly 4 miles to stop a takes nearly 4 miles to stop a loaded down-bound ship in the loaded down-bound ship in the Mississippi River entrance passes.Mississippi River entrance passes.
Many ships will end up stranded Many ships will end up stranded aground after this maneuver.aground after this maneuver.
Associated Branch Pilots for the Port of Associated Branch Pilots for the Port of New OrleansNew Orleans
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Crash Stop
Associated Branch Pilots for the Port of Associated Branch Pilots for the Port of New OrleansNew Orleans
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Loaded Tanker~ 4 Miles to Stop in High River
Crash Stop Starts Here
4 miles to sea
Mississippi RiverSouthwest Pass Exit Channel
Crash Stop Ends Here
THANK YOU
Pilots Consequences Lack of Channel Pilots Consequences Lack of Channel
Maintenance Dredging on the MississippiMaintenance Dredging on the Mississippi
RiverRiver