標題: Bathymetry enhancement by altimetry-derived gravity anomalies in the East Sea (Sea of Japan)
作者: Kim, Kwang Bae
Hsiao, Yu-Shen
Kim, Jeong Woo
Lee, Bang Yong
Kwon, Yi Kyun
Kim, Chang Hwan
土木工程學系
Department of Civil Engineering
關鍵字: Bathymetry enhancement;Altimetry-derived free-air gravity anomalies;East Sea (Sea of Japan);Gravity-geologic method (GGM);Density contrast
公開日期: 1-Dec-2010
摘要: The gravity-geologic method (GGM) was used to enhance the bathymetry of the East Sea (Sea of Japan) with satellite altimetry-derived free-air gravity anomalies and shipborne depth measurements. By comparison with the bathymetry model of Smith and Sandwell's (SAS) approach (1994), GGM was found to have an advantage with short wavelength (<= 12 km) components, while SAS better predicts longer wavelength (>= 25 km) components, despite its dependency on density contrast. To mitigate this limitation, a tuning density contrast of 10.25 g/cm(3) between seawater and the seafloor was primarily estimated by the downward continuation method and then validated by the check points method with GGM. Similarly, SAS is limited by the "A" value in low-pass part of the Wiener filter, which defines the effective range of the wavelength components on bathymetry. As a final result, we present an enhanced GGM bathymetry model by integrating all available data.
URI: http://dx.doi.org/10.1007/s11001-010-9110-0
http://hdl.handle.net/11536/26258
ISSN: 0025-3235
DOI: 10.1007/s11001-010-9110-0
期刊: MARINE GEOPHYSICAL RESEARCHES
Volume: 31
Issue: 4
起始頁: 285
結束頁: 298
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