Protection of Offshore Structures against Underscourby Chesley J. Posey, (F.ASCE), Prof. of Civ. Engrg.; Univ. of Connecticut, Storrs, Conn. and Dir., Rocky Mt. Hydr. Lab., Allenspark, CO,
Serial Information: Journal of the Hydraulics Division, 1971, Vol. 97, Issue 7, Pg. 1011-1016
Document Type: Journal Paper
Discussion: Silvester Richard (See full record)
This paper summarizes the results of several investigations of underscour, which can endanger offshore structures. Reproduction at model scale of an unusual pattern of scour, a general lowering of the seabed under and around the whole structure, as first observed by divers, led to improved understanding of the phenomenon. Theoretical studies predicting this type of erosion, which contrasts with the usual bridge-pier type, are cited. Flow through the permeable seabed from high pressure zones under wave crests to low pressure zones under the troughs assists the local velocity in rapidly eroding the seabed. The use of reverse filters is indicated. Model tests, special severe erosion studies, and experience with offshore installations show how effective and economical protection can be obtained.
Subject Headings: Offshore structures | Scour | Protective structures | Erosion | Sea floor | Dynamic pressure | Wave velocity | Wave pressure | Wave crest
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