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Tracking and prediction of spilled oil in the Japan Sea by using multi-satellite sensor images and geographic information system

利用多卫星传感器图像和地理信息系统对日本海溢油进行跟踪和预测

基本信息

批准号：
10680503
负责人：
KOZAI Katsutoshi
金额：
$ 1.98万
依托单位：
Kobe University of Mercantile Marine
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2000
项目状态：
已结题

项目摘要

Sea surface topography derived from TOPEX/POSEIDON altimeter data including the drifting period of Nakhodka bow section is investigated. Compared with the period before the accident the sea surface height north of Oki islands was raised about 80mm higher than the one at north of Noto Peninsula. As a result the spatial density of sea surface contour became dense at the sunken point south of JMA buoy and the direction of sea surface contour tends to align north-south direction. The sea surface gradient of the study area shows the difference of 140mm on sea surface height relative to the horizontal distance about 110km, which means the geostrophic current of about 0.24 knot with the south-south-east direction. Geostrophic velocities derived from along-track altimeter height gradients reveal the effect of small scale cyclonic eddy on the drifting path of Nakhodka bow section during the period of negligible wind influence.Satellite altimetry using ERS-2 data has been applied to monitor and track upwelling points of spilled oil from the sunken tanker. Geostrophic surface transport estimated from ERS-2 altimeter data has been compared with in situ upwelling point location relative to the one of sunken tanker. It was found out that the larger the magnitude of surface transport, the longer the distance from the upwelling points to the location of sunken tanker. Furthermore the direction of surface transport correlates well with the azimuth of upwelling point relative to the location of sunken tanker.

利用TOPEX/POSEIDON卫星高度计资料，研究了包括纳霍德卡船首段漂移期的海面地形。与事故前相比，隐岐群岛以北的海面高度比诺托半岛以北的海面高度高出约80毫米。结果表明，在JMA浮标以南的下沉点处，海面等高线的空间密度变大，且海面等高线的走向趋于南北向。研究区的海面梯度显示，相对于110 km的水平距离，海面高度差约为140 mm，即存在约0.24节的南-南-东向地转流。由沿航迹高度梯度反演的地转速度揭示了在可忽略风影响期间小尺度气旋性涡旋对Nakhodka船首段漂移路径的影响，并利用ERS-2卫星测高数据对沉没油轮溢油上涌点进行了监测和跟踪。用ERS-2卫星高度计资料估算的地转地面输送与现场上升流点位置进行了比较。结果表明，水面输运量越大，上升流点到沉船位置的距离越远。此外，海面输运的方向与上升流点相对于沉没油轮位置的方位角有很好的相关性。