Abstract
The physical properties of silt in river reservoirs are important to river dynamics. Unfortunately, traditional techniques yield insufficient data. Based on porous media acoustic theory, we invert the acoustic parameters for the top river-bottom sediments. An explicit form of the acoustic reflection coefficient at the water–sediment interface is derived based on Biot’s theory. The choice of parameters in the Biot model is discussed and the relation between acoustic and geological parameters is studied, including that between the reflection coefficient and porosity and the attenuation coefficient and permeability. The attenuation coefficient of the sound wave in the sediments is obtained by analyzing the shift of the signal frequency. The acoustic reflection coefficient at the water–sediment interface is extracted from the sonar signal. Thus, an inversion method of the physical parameters of the riverbottom surface sediments is proposed. The results of an experiment at the Sanmenxia reservoir suggest that the estimated grain size is close to the actual data. This demonstrates the ability of the proposed method to determine the physical parameters of sediments and estimate the grain size.
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This work was supported by the National Key R&D Program of China (Grant No.2016YFC0401608), the Scientific Fund of the Yellow River Institute for Hydraulic Research (Grant Nos. HKY-JBYW-2016-09 and HKY-JBYW-2016-29).
Li Chang-Zheng: See biography and photo in the APPLIED GEOPHYSICS June 2014 issue, P. 235
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Li, CZ., Yang, Y., Wang, R. et al. Acoustic parameters inversion and sediment properties in the Yellow River reservoir. Appl. Geophys. 15, 78–90 (2018). https://doi.org/10.1007/s11770-018-0663-z
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DOI: https://doi.org/10.1007/s11770-018-0663-z