Science Service System

Summary of Proposal OCE0212

TitleStudy Oceanic Internal Waves in China Seas by TerraSAR data
Investigator HUI, SHEN - institute of oceanology, Chinese Academy of Sciences, Lab of Ocean circulation and wave studies
Team Members
senior professor Yijun, HE - Institute of Oceanology, Chinese Academy of Sciences, Lab of Ocean circulation and wave studies
Master Candidate Yinhe, CHENG - Institute of Oceanology, Chinese Academy of Sciences, Lab of Ocean circulation and wave studies
Mr. Perrie, William - Bedford Institute of Oceanography, Fisheries and Oceans
SummaryNowadays, the research of oceanic internal waves has passed the stage when its measurements are totally depended on in-situ instruments. The development of remote sensing techniques has greatly promoted the research of oceanic internal waves. To retrieve kinematical and dynamic characteristics of internal waves from remote sensing images is the prime content of the interpretation of internal waves from remote sensing images. According to different application field, the interpretation of internal waves from remote sensing images can be separated to two aspects; one is qualitative study, the other is quantitative study. Firstly, from SAR images, the spatial distribution of internal waves can be retrieved directly, which would be very difficult to achieve for the traditional in-situ measurements; furthermore, the qualitative information of the internal waves, such as the propagation direction, the effect of bottom refraction, the origin source of the internal waves etc, can be got. Secondly, many dynamical parameters of internal waves can be got quantitatively from SAR images, such as wavelength, propagation speed, amplitude etc. In this project, the chief objective is to study how to get qualitative and quantitative information of internal waves from TerraSAR images. The spatial and temporal distribution of internal wave in China seas as well as the generation mechanisms will be studied by large amount of TerraSAR images and numerical models. An assimilation numericdal model will be established, which will assimilate TerraSAR data into three dimensional dynamical internal wave model and realized the retrieval of dynamical parameters from TerraSAR images, and also the hindcast, nowcast and forecast of the propagation of internal waves in the studied sea area will be accomplished. The study methods of this project contain digital image processing, Geophysical numerical model, and statistics etc. For qualitative study, traditional statistics methods will be used to gather the temporal and spatial distribution and propagation characteristics of internal waves. KDV equation will also be introduced to qualitatively explain the characteristics of internal waves in China seas. In order to study the internal waves in a whole-scale, a three dimensional dynamical numerical model will be developed to simulate the propagation of internal waves. And the bottom effect, earth rotation effect, diffusion effect etc will be introduced in this fully nonlinear model. The internal wave models such as Lynett(2002) and Gerkema(1996) will be used as reference. And also in the interpretation of internal waves from TerraSAR images, method of Liu(1998), Porter(1999), Yang(2000), Zhao(2003), Zeng(2004) etc will be referred. To some extent, the generation of the internal waves is random, so not all TerraSAR images can capture internal waves, therefore, to study the statistical characteristics of internal waves in China Seas, large amount of TerraSAR images (more than 100 images) in the China seas are needed. The SCANSAR mode, HH or VV polarization images will be suitable. This project will be partly supported by Chinese Academy of Sciences and China national offshore oil corporation.

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DLR 2004-2016