Accession Number:

AD0698156

Title:

THE EFFECT OF TWO-DIMENSIONAL TOPOGRAPHY ON SUPERFICIAL THERMAL GRADIENTS.

Descriptive Note:

Technical rept.,

Corporate Author:

GEOLOGICAL SURVEY RESTON VA

Personal Author(s):

Report Date:

1969-01-01

Pagination or Media Count:

101.0

Abstract:

The Jeffreys-Bullard theory of the topographic disturbance to geothermal gradients is only approximate because it neglects the effects of lateral heat loss through sloping surfaces. It cannot be applied with confidence where the height of the relief features is large relative to their horizontal distance from the station and to the depth of the measurement points. In an important special case, the measurement depth is small relative to the distance to the relief, and the gradient anomaly can be approximated by the value applicable at zero depth. To investigate this case, an exact solution was obtained for the steady heat flux through an inclined plane of arbitrary height and slope angle. The effects of slopes of fairly general two-dimensionalform can be approximated by identifying them with their equivalent plane slopes--the plane slopes which yield the same Jeffreys approximation at the station. The results are valid at points arbitrarily close to slopes of any height or inclination. Author

Subject Categories:

  • Physical and Dynamic Oceanography
  • Geology, Geochemistry and Mineralogy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE