Waterborne Seismic Reflection Investigation of Pool 3, Monongahela River, Pennsylvania Report 1: Interpretation of Geophysical Data.
1997
Sjostrom, Keith J. | Leist, Rodney L.
The objective of the geophysical investigation is to quantify with depth the lateral limits of bottom and subbottom fine-grained sediments in terms of material density and general soil classification to depths of 15 ft below the bottom surface. The results are intended to supplement previously obtained soil samples by providing continuous profile line coverage of the bottom and subbottom sediments along the length of the project area. This will facilitate the accurate positioning of any additional borings that may be required. Report 1 of this study intends to delineate subbottom sediment interfaces, identify river bottom features and general sediment characteristics, and provide preliminary sediment characterization based on available core information. Report 2 of the investigation will concentrate on detailed sediment characterization based on computed acoustic impedance values and inferred sediment density values and material types. Report 2 will follow the in depth sediment analysis of a series of cores strategically collected within the project area. Overall, the seismic reflection data will provide better descriptions of variations in the actual subbottom conditions and help identify the differing sediment layers. Two high resolution subbottom profiling systems and a side scan sonar system were used to meet the primary objectives of the investigation.
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