ACOUSTIC IMAGING OF EXPERIMENTAL SUBAQUEOUS SEDIMENT-LADEN FLOWS AND THEIR DEPOSITS

作者：Perillo Mauricio M^*; Minton Brandon; Buttles Jim; Mohrig David

来源：Journal of Sedimentary Research, 2015, 85(1): 1-5.

DOI：10.2110/jsr.2014.93

This paper presents a noninvasive acoustic reflection technique to visualize sedimentladen flows over a wide range of sediment concentrations (5-75% by volume) in the laboratory. A Panametrics V301-SU Immersion transducer with 0.5 MHz center frequency was used to generate acoustic reflections that were sampled at 10 MHz. The strength of this technique is the direct characterization of both the internal structure of sedimentladen flows and their deposits, especially for highconcentration conditions. A combination of reflection continuity, amplitude, and mutual coherence were used to identify three distinct acoustic facies: short-scatter, long-scatter, and continuous-reflection. Here we present two examples in which the acoustic facies allows the interpretation of (a) the temporal evolution of internal mixing and stratification within a flow and contemporaneous deposition of its sediment and (b) the horizontal and vertical partitioning of mud and sand within a deposit generated by a sedimentladen flow.

• 出版日期2015-1