Detecting and Applying Thermal Signals in a Tidal Flats Environment

Abstract

Time series observation of vertical profiles of sediment temperatures are presented for several locations at two distinct tidal flats. Surface sediment temperatures are shown to be strongly dependent on solar insolation during low-tide exposure, and that signal is communicated to the subsurface sediment temperatures, a vertical diffusion balance explains the observations well and an estimate of thermal diffusivity is obtained for each location. A theoretical model relating sediment porosity to thermal diffusivity is presented and shown to agree with independent estimates of porosity. In addition, thermal diffusivity is shown to correlate with direct observations of sediment composition (percent sand) and surface strength. Results are suggested for application to remote classification of sediments using infrared time series images.

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Document Details

Document Type
Technical Report
Publication Date
May 19, 2010
Accession Number
ADA535713

Entities

People

  • Jim Thomson

Organizations

  • University of Washington

Tags

Communities of Interest

  • Materials and Manufacturing Processes
  • Space

DTIC Thesaurus Topics

  • Conduction (Heat Transfer)
  • Conductivity
  • Diffusion
  • Diffusivity
  • Equations
  • Heat Capacity
  • Heat Energy
  • Heat Transfer
  • Latent Heat
  • Physics Laboratories
  • Radiation
  • Solar Radiation
  • Thermal Conductivity
  • Thermal Diffusivity
  • Thermal Properties
  • Water
  • Weather Stations

Readers

  • Atmospheric Remote Sensing.
  • Geotechnical Engineering.
  • Materials Science and Engineering.