Accession Number : AD0715618

Title :   Animal Undermining of Naval Seafloor Installations.

Descriptive Note : Final rept. Jul 69 - Jul 70,

Corporate Author : NAVAL CIVIL ENGINEERING LAB PORT HUENEME CALIF

Personal Author(s) : Muraoka,James S.

Report Date : AUG 1970

Pagination or Media Count : 22

Abstract : In-situ foundation performance experiments are being conducted by placing 4-foot diameter cylindrical concrete footings for undersea structures on the ocean floor in 120 feet of water. During periodic monitoring of footing performance, excessive settlement was noted and the resulting inspection of the footings by divers showed several animal burrows under the footings. As a result of this finding, a field study was initiated to investigate and to identify burrowing animals which may undermine the footings of Navy undersea structures. A control method which will prevent animals from burrowing underneath objects placed on the ocean bottoms was investigated. A limited literature search was also conducted to determine what type of borrowing animals may be present in the vicinity of the Pitas Point Test site. (Author)

Descriptors :   (*AQUATIC ANIMALS, DAMAGE CONTROL), (*FOUNDATIONS(STRUCTURES), UNDERWATER), MARINE BORERS, CRUSTACEA, NEMATODA, OCEAN BOTTOM, ANCHORS(STRUCTURAL), PROTECTIVE TREATMENTS, COPPER COMPOUNDS, PEST CONTROL

Subject Categories : Biological Oceanography
      Marine Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE