Accession Number : AD0724674

Title :   Ocean Engineering Significance of Marine Seismic Reflection Profiling Technology.

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

Corporate Author : NAVAL CIVIL ENGINEERING LAB PORT HUENEME CALIF

Personal Author(s) : Pawlowicz,E. F.

Report Date : MAY 1971

Pagination or Media Count : 51

Abstract : Seismic Reflection Profiling (SRP) data of value to the seafloor engineer include: (1) sediment ('soil') thickness, (2) sediment structure, (3) the slope of the bedrock beneath the sediment layer, (4) bedrock topography, if sufficient tracklines are run to permit contouring, (5) bedrock structure, if penetration permits, and (6) acoustical data from which certain physical, engineering, and load bearing properties of an area can be approximated. Qualitative interpretations of acoustical data are made as a matter of course by the experienced analyzer of SRP records and include such parameters as: (1) echo intensity from the seafloor and subbottom interfaces, indicating hard (high reflectivity) and soft (low reflectivity) layers, (2) penetrability of the seafloor (in unconsolidated sediments) is generally inversely proportional to grain size, (3) point return, or discrete hyperbolic echo returns, indicative of large irregularities compared to the sound frequency recorded, such as boulder beds, or a weathered bedrock surface. (Author)

Descriptors :   (*OCEAN BOTTOM TOPOGRAPHY, ECHO RANGING), (*CONSTRUCTION, OCEAN BOTTOM), SOIL MECHANICS, THICKNESS, STRUCTURAL PROPERTIES, ROCK, ACOUSTIC SIGNALS, LOADS(FORCES), PARTICLE SIZE, SHEAR STRESSES, ELASTIC PROPERTIES

Subject Categories : Physical and Dynamic Oceanography

Distribution Statement : APPROVED FOR PUBLIC RELEASE