基于多源遥感数据的日本海内波特征研究

Analysis of internal waves in the Japan Sea with multi-sensors remote sensing data

日本海特殊的地理位置和复杂的地形使得该海域内波表征极为复杂,遥感是大范围观测内波的有效手段,已被广泛应用于内波的探测研究。本文利用MODIS、GF-1和ENVISAT ASAR遥感影像,开展了日本海内波特征研究。通过提取内波波峰线,生成了日本海内波空间分布图;获取了内波的波峰线长度和传播速度,并基于非线性薛定谔方程反演了内波振幅。研究结果表明,日本海内波分布范围宽广,不仅大陆架沿海区内波分布密集,深海盆地也探测到了大量内波;日本海北部45°N附近海域有少量内波出现,利用高分影像探测到朝鲜陆架浅海区有大量小尺度内波,大和海盆、大和隆起的西南部海域没有发现内波。日本海内波波峰线长达100多千米,深海区的传播速度大于1m/s;浅海区内波振幅约10m左右,深海区可达60m以上。

The sea surface features of internal waves in the Japan Sea are very complicated because of the special geographical location and topography.Remote sensing is an effective method for the detection of internal waves,and has been applied to the investigation of internal waves.In this paper,a study of internal waves in the Japan Sea with MODIS,GF-1 and ENVISAT ASAR data was presented.The distribution of internal waves in the Japan Sea was presented by extracting crests of internal waves.The crest length and propagation speed of internal waves were presented and amplitude inversion of internal waves in the Japan Sea were also conducted using the nonlinear Schr9 dinger（NLS）equation.The results demonstrated that internal waves in the Japan Sea shows broad distribution which mainly distributed in the zone of continental shelf and deep sea.The zone near the Japan Sea of 45°N where are fewer internal waves.A large number of small scale internal waves were detected in the continental shelf shallow of North Korea using GF-1 image.Internal waves in the southwest of Yamato Basin and Yamato Rise was not detected.The crest length of internal waves in the Japan Sea is usually more than 100 km,and the propagation speed of internal waves in the deep sea is greater than 1 m/s.The amplitude of internal waves in the continental shelf shallow is about 10 m,and it can be up to 60 min the deep sea.