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Groundwave height-gain functions near a shoreline

Author: R Michael Jones; Environmental Research Laboratories (U.S.),
Publisher: Boulder, Colo. : U.S. Department of Commerce, National Oceanic and Atmospheric Administration, Environmental Research Laboratories, [1984]
Series: NOAA technical report ERL, 426.; NOAA technical report ERL., WPL ;, 59.
Edition/Format:   Print book : National government publication : EnglishView all editions and formats
Summary:
A saddlepoint approximation to a Kirchhoff integration over the surface of the Earth is used to derive formulas for the groundwave field for an elevated observer near a shoreline. It is shown that the transition from homogeneous groundwave propagation to mixed-path groundwave propagation occurs not at a vertical plane above the shoreline, but rather at an oblique surface tilted in the direction of propagation. Thus,  Read more...
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Material Type: Government publication, National government publication, Internet resource
Document Type: Book, Internet Resource
All Authors / Contributors: R Michael Jones; Environmental Research Laboratories (U.S.),
OCLC Number: 12038563
Notes: Distributed to depository libraries in microfiche.
"October 1984."
Description: iv, 43 pages : illustrations ; 28 cm
Series Title: NOAA technical report ERL, 426.; NOAA technical report ERL., WPL ;, 59.
Responsibility: R.M. Jones.

Abstract:

A saddlepoint approximation to a Kirchhoff integration over the surface of the Earth is used to derive formulas for the groundwave field for an elevated observer near a shoreline. It is shown that the transition from homogeneous groundwave propagation to mixed-path groundwave propagation occurs not at a vertical plane above the shoreline, but rather at an oblique surface tilted in the direction of propagation. Thus, close enough to the shoreline and high enough, the field over land (for sea-to-land propagation) will not be affected by the land beneath the observer, so that the field is represented in terms of sea-type groundwave modes (with the associated height-gain functions) even though the observer is above the land. This phenomenon is explained by interpreting groundwave modes as ground-reflected waves. There is a transition region (of several hundred kilometers horizontally for HF propagation) where diffractive corrections must be made because of the location of the shoreline.

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