Fluvial Seismo-Acoustics: Characterizing temporally dependent river conditions through near river seismic and acoustic signals Public Deposited

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Last Modified
  • March 19, 2019
Creator
  • Ronan, Timothy
    • Affiliation: College of Arts and Sciences, Department of Geological Sciences
Abstract
  • Mechanisms that produce seismic and acoustic wave fields near rivers are poorly constrained because of a lack of observations relating river conditions to the near-river seismo-acoustic signals. To understand how temporally dependent river conditions impact the surrounding acoustic and seismic fields, I conducted experiments that test the relationships between near-river seismo-acoustic signals and river discharge, water wave action, and spatial variance. Experimental results provide evidence suggesting that seismic and acoustic energies are generated by water waves. The spectral content of these seismo-acoustic signals are controlled by measurable river parameters that include the bathymetric profile, discharge, and Froude number. Furthermore, I am able to locate finite regions that are likely to produce acoustic signals. By comparing regions of high temporal coherence to features at the river’s surface, I am able to suggest which hydro- dynamic features (hydraulic jumps/eddies) produce acoustic signals. Robust correlations between seismic and acoustic observations and identifiable river conditions can verify fluvial seismo-acoustical models and constrain seismo-acoustic observations made near rivers, which could eventually be used as a tool for monitoring fluvial processes.
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Rights statement
  • In Copyright
Advisor
  • Pavelsky, Tamlin
  • Lees, Jonathan
  • Mikesell, Thomas
Degree
  • Master of Science
Degree granting institution
  • University of North Carolina at Chapel Hill Graduate School
Graduation year
  • 2017
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