DE-Lecture20-Remedial-Dredging

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

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Unformatted text preview: Dredging Dredging Engineering Lecture 20 Remedial Dredging Luis Prieto-Portar 2010 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 12th. 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. 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 the large quantities of soft clay involved in the fill will weaken the berms and compromise their structural integrity. BP is refocusing in the well head itself, possibly using remotely operated vehicles (ROV) which will saw to cut the 1” thick steel riser pipe, which is 20” in diameter. The ROVs will help place two 14-ft high and 4-ft diameter caps on thepipe. A Weeks Marine cutter-suction dredge ready in Louisiana to start the barrier islands. Meanwhile, the US Army CoE is asking the President to temporarily halt the Jones Act, in order to permit Dutch vessels to enter the US and help skim oil up with sweeping arms that are attached to ships. These arms are capable of skimming up to 350 m3 of oil per hour. Other resources: - Clean harbors Inc, Norwell, Massachusetts.; - Dept. of Oceanography and Coastal Sciences, Louisiana State University; ...
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This note was uploaded on 08/29/2011 for the course CGN 4930 taught by Professor Prieto-portar during the Summer '11 term at FIU.

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

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