碩士 / 國立交通大學 / 土木工程研究所 / 83 / Since the lauch of Seasat, the research on the prediction of
bathymetry has begun a new era. In this study the satellite
-derived gravity is used for the prediction. The satellite
gravity over the South China Sea is determined by least-squares
collocation using data from Seasat, Geosat, TOPEX/POSEIODN,
S-1/35day and ERS-1/168day missions. The satellite gravity has
a higher accuracy than that derived by Sandwell et al.(1994)
and shows rms errors of 47.76 and 13.14 mgals respectively
afterd before the adjustment when compared with the ship data.
The gravity from Sandwell et al.(1994) has rms errors of 51.02
and 21.78 mgals with ship gravity. The short-wavelength
bathymetry produces the short-wavelength gravity anomalies,
while the long-wavelength bathymetry ismpensated. Using the
linear relationship between gravity anomaly and bathymetry in
frequency domain, this paper employs a theoretical compensation
model to determine geophysical parameters. Based on the remove-
restore procedure, we compute thethymetry from marine gravity
using FFT. The rms difference between the predicted bathymetry
and ship bathymetry is on the order of 200-400 meters, owing to
the uncertainty in the geophysical parameters, which are
affected by the sediment layer.
| Identifer | oai:union.ndltd.org:TW/083NCTU0015005 |
| Date | January 1995 |
| Creators | Dar-Shan Hwang, 黃大山 |
| Contributors | Cheinway Hwang, 黃金維 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 84 |
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