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DE-Lecture20-Remedial-Dredging

DE-Lecture20-Remedial-Dredging - Dredging Dredging...

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Dredging Engineering Lecture 20 Remedial Dredging Luis Prieto-Portar 2010
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BP Oil Spill in Gulf of Mexico. The first effort to cap the gushing oil from the April 20th collapse of the Macondo oil drilling rig included a 4” diameter riser tube. It captures less than 5% of the oil flow by May 12 th .
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A second measure tried by BP was the “top kill” which involved forcing mud and debris on top of the well to clog it up; it failed on 30 May. The third method involved a steel cap with a riser, seen below; two were tried, and also failed by 30 May.
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The USArmy CoE issued an emergency permit to the State of Louisiana for a fourth solution: build a 45 mile long coastal barrier to keep the oil from reaching the Louisiana marshes. The barrier will be built with dredges that pick up material from the borrow areas shown at left, and transport them to the barrier with scows towed by tugs. Several dredging contractors are working on this solution (15 June), but are concerned that
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