應用航海雷達遙測海洋鋒面之研究
Date Issued
2004
Date
2004
Author(s)
王冑
DOI
922611M002005
Abstract
Radar is an important tool for remote sensing. The strength of back-scattering, generated
by Radar waves hitting sea surface roughness elements, i.e. small waves, is associated closely
with the distribution of surface roughness elements and with the strength of the latter as well.
Therefore, external parameters, such as waves, winds, raindrops and flow structures, etc. whose
properties can excite small waves thus could be deduced inversely from the back-scattering
signals of Radar. A tongue-like river plume is a typical pattern usually observed at an estuarine
region where the brackish effluents from the river meet the offshore saltier waters. The outer
rim of a river plume is a convergence zone, where small waves become energetic causing by the
wave-current interaction mechanism. Therefore, we anticipate that the outer rim of a river
plume is a zone with high sea surface roughness, which could be detected from the Radar
imageries readily. This year, we have set up a land-based Radar station at Sar-Luen, Tanshui.
We expect to get more insights on the response of Radar imageries to the behavior of flow
fields, and we may extend and utilize these understandings to study the internal solitons in the
South China Sea area, by virtue of these measurements. Field observations at Sar-Luen do show
significant patterns of the movement of the tongue-like river plume which is associated with the
semi-diurnal tidal cycle closely. The plume pattern shown by Radar measurements is consistent
with the field CTD surveys well.
Publisher
臺北市：國立臺灣大學海洋研究所
Type
report
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