Mapping the underside of arctic sea ice by backscattered sound

Autor:	T. K. Kan, C. S. Clay, J. M. Berkson
Rok vydání:	1973
Předmět:	geography geography.geographical_feature_category Acoustics and Ultrasonics Plane (geometry) Scattering Mineralogy Surface finish Sonar Arctic ice pack Arts and Humanities (miscellaneous) Aerial photography Physics::Atmospheric and Oceanic Physics Geology Sound (geography) Remote sensing
Zdroj:	The Journal of the Acoustical Society of America. 53:777-781
ISSN:	0001-4966
DOI:	10.1121/1.1913391
Popis:	A narrow‐beam scanning sonar was used to measure the relative backscattering strengths at 48 kHz of the undersurface of arctic sea ice. The graphic records displaying the range and relative scattering levels were assembled into a sonar map that displays the location and shape of under‐ice features. The data indicate that there are two distinct types of backscattering: (1) very high level backscattering from well‐defined under‐ice ridges and (2) very low level backscattering from between the ridges. The higher scattering the ridges is probably due to the increase in roughness and the tilting of the average plane of the scattering surface. Comparison of the sonar map and the aerial photograph shows that most surface features have subsurface expressions and that their relationship can be complex.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::de4a602ec72d7159b1208d3e8eb4fbe8 https://doi.org/10.1121/1.1913391 Zobrazit plný text záznamu