Ocean Engineering Significance of Marine Seismic Reflection Profiling Technology.

摘要

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)