長賜輪在蘇伊士運河擱淺後,綜合外電報導的省思:極限邊緣的船舶操縱,科學與安全之間給”人的反應”留下多少”餘裕空間?
航行員都知道:在有限水域中的船舶操縱與大洋中的船舶操縱有極大的差別,也因此而產生一些”異常反應”的專有名詞,譬如:淺水效應,岸吸/岸推,船體下坐(Squat),狗頭嗅地(Dog smelling),單俥右旋船在淺水區倒俥時之船頭可能向左,主要的原因都是來自船舶四周的海水,來不及湧入去填補船艉所造成之空穴.
也因為這個緣故,Suez Canal當局對過河船隻有一些船寬,吃水,速度上的限制.基於經濟上的考慮,可以想像這些限制都是在”水工模型”下最大化的尺度界線.(越大的船過河費越貴),然而這些都是理想環境下的科學論證,實際上船舶操縱者的精神狀態,駕駛台的氣氛環境,外界視線,無線電之干擾,Marlboro菸未如預期,住艙走廊上”波斯市場”的氛圍….都在影響著”駕駛台資源管理(BRM)”,而使得船舶之實際Performance遊走在”紅線”邊緣,更糟的是一但越過紅線(Point of non-return),情況就越來越糟,猶如在山脊上騎腳踏車.
這次的重大意外,在檢討”船舶因素”之外,蘇伊士運河當局也應該重新考慮”紅線邊緣的緩衝區”是否應適度放寬,以因應船舶無止境的大型化,因應極端氣候下的異常天氣,因應新世代船員之特性,另外也可考慮在駕駛台放一箱Marlboro,讓有需要的人看自己包包大小量力自取,畢竟比起全球供應鏈上的損失,這都是微不足道的”潤滑油”.不是嗎?
The Suez Canal Authority occasionally brings out updated tables of width and acceptable draft for ships. Currently the permissible limits for suezmax ships are 20.1 m (66 ft) of draught with the beam no wider than 50 m (164.0 ft), or 12.2 m (40 ft) of draught with maximum allowed beam of 77.5 m (254 ft). Due to their design and size, a large number of ports around the world can accommodate suezmax vessels.
17,65 56,96
, a new set is being built for vessels as large as 366 meters in length, 49 meters in beam and 15.2 meters in draft at tropical frvessel.
That would have surpassed the speed limit of about 7.6 knots (8.7 miles an hour) to 8.6 knots that is listed as the maximum speed vessels are “allowed to transit” through the canal, according to the Suez authority’s rules of navigation handbook posted on its website. Captains interviewed for this story said it can pay to increase the speed in the face of a strong wind to maneuver the ship better.
“Speeding up to a certain point is effective,” said Chris Gillard, who was captain of a 300-meter container ship that crossed the Suez monthly for nearly a decade until 2019. “More than that and it becomes counter effective because the bow will get sucked down deep into the water. Then, adding too much power does nothing but exacerbate the problem.”
“You might find yourself positioning the ship in one direction, and you’re actually moving in another direction,” said Kinsey. “There’s a very fine line between having enough speed to maneuver and not having too much speed that the air and hydrodynamics become unstable. Any deviation can get real bad real quick because it’s so tight.”
The accident will be a missed opportunity if the industry doesn’t adapt, he said. “There will be vessels larger than this one that will be going through the Suez,” he said. “The next incident will be worse.”
• The Ever Given's speed was 13.5 knots before it ran aground, The Japan Times reported.
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• Bloomberg reported the Suez Canal speed limit was between 7.6 knots and 8.6 knots.
The Ever Given didn't have a tugboat escort through the canal, according to Bloomberg. The two ships immediately ahead of it reportedly had escorts, although such escorts were not required.
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