《硕士学位论文-石新刚》由会员分享，可在线阅读，更多相关《硕士学位论文-石新刚（44页珍藏版）》请在金锄头文库上搜索。
1、谨以此论文献给即将结束的三年硕士生涯-石新刚南海东北部深水海域大振幅内孤立波的数值模拟和SAR遥感仿真研究 学位论文完成日期： 指导教师签字： 答辩委员会成员签字： 独 创 声 明本人声明所呈交的学位论文是本人在导师指导下进行的研究工作及取得的研究成果。据我所知，除了文中特别加以标注和致谢的地方外，论文中不包含其他人已经发表或撰写过的研究成果，也不包含未获得 （注：如没有其他需要特别声明的，本栏可空）或其他教育机构的学位或证书使用过的材料。与我一同工作的同志对本研究所做的任何贡献均已在论文中作了明确的说明并表示谢意。 学位论文作者签名： 签字日期： 年 月 日-学位论文版权使用授权书 本学位论
2、文作者完全了解学校有关保留、使用学位论文的规定，有权保留并向国家有关部门或机构送交论文的复印件和磁盘，允许论文被查阅和借阅。本人授权学校可以将学位论文的全部或部分内容编入有关数据库进行检索，可以采用影印、缩印或扫描等复制手段保存、汇编学位论文。同时授权中国科学技术信息研究所将本学位论文收录到中国学位论文全文数据库，并通过网络向社会公众提供信息服务。（保密的学位论文在解密后适用本授权书）学位论文作者签名： 导师签字：签字日期： 年 月 日 签字日期： 年 月 日南海东北部深水海域大振幅内孤立波的数值模拟和SAR遥感仿真研究摘 要 本文基于连续分层海洋模型，使用一般化（GK-dV）方程对南海东北部
3、深水海域大振幅内孤立波进行模拟，并在此模拟的基础上进行内孤立波SAR遥感仿真研究。一般认为，非线性海洋内波的本征值问题都需要考虑海水层化状况和背景剪切流，但这却给方程的求解带来了很大的挑战。本文推导了一种基于Thomson-Haskell算法求解非线性海洋内波本征值问题的数值方法。基于连续分层海洋模型，完善的求解了非线性内波模态方程，并在后文内孤立波模态方程的求解中使用。在内孤立波模态方程求解的基础之上，基于连续分层海洋模型，使用GK-dV方程分别在由正压涨潮潮流和斜压环流、正压落潮潮流和斜压环流构成背景流场的情况下进行南海东北部深水海域（深水海盆和陆架坡折海域）大振幅内孤立波的数值模拟。分析
4、正压潮流对内波模态结构函数，GK-dV方程非线性系数、频散系数、长内波相速度c，内孤立波振幅和波形的影响。发现正压潮流对和影响较小，而对和c影响较大。对的影响随着水深的变浅越来越大，而对c的影响无论在浅海还是深海均是一致的，且当斜压环流与正压潮流同向时(绝对值)和c值比较大。同时在模拟内孤立波过程中发现，正压涨落潮潮流对内孤立波主孤立子波形和振幅影响的差别较小，但是对内孤立波的非线性演变过程影响的差别较大。在内孤立波数值模拟的基础之上，进行内孤立波的SAR遥感仿真研究。我们建立一种新的基于连续分层海洋模型的内孤立波SAR遥感仿真模型。通过与基于两层海洋模型的内孤立波SAR遥感仿真模型模拟结果的
5、对比，发现无论在水平还是垂直极化方式下，新模型均显著地改善了半波宽度的模拟精度，更符合观测实际。关键词：内孤立波，正压潮流，SAR遥感，数值模拟，南海Numerical Simulation and Research of SAR Signatures of Lager-amplitude Internal Solitary Waves in the Deep Sea in the Northeast South China SeaAbstractIn this paper, the simulation of propagation of the large-amplitude intern
6、al solitary waves in the deep sea in the Northeast South China Sea is made on the basis of continuous stratified oceanic model and by using the generalized K-dV(GK-dV) equation. Moreover, the simulation research of SAR signatures of the large-amplitude internal solitary waves is made.In the ocean ge
7、nerally the background shear current and ocean stratification must be taken into the eigenvalue problem of nonlinear internal waves, but this takes some difficulty for equation solution. In this paper, a numerical calculation method of eigenvalue problem of nonlinear internal waves is presented on t
8、he basis of the Thompson-Haskells calculation method. It is perfectly solved the eigenvalue problem of nonlinear internal waves on the basic of continuous stratified oceanic model. And it is used in the follows when solves the eigenvalue problem of internal solitary waves.Based on the works that pre
9、cede, it uses the model, which is on the basis of continuous stratified oceanic model and using the GK-dV equation, to simulation of large-amplitude internal solitary waves in the deep sea (the sea basin and the continental slope area) in the Northeast South China Sea. And the model is used in two c
10、onditions: one is that the background current is composed of circulation and flood current, and the other is composed of circulation and ebb current. The impact of barotropic tidal current on internal wave mode structure function, the nonlinearity coefficient and the dispersion coefficient of GK-dV
11、equation, the phase speed of long internal waves, as well as the amplitude and shape of internal solitary waves is considered. It is found that barotropic tidal current has a small effect on and, but has a great effect on and. The effect on in the shallow sea is larger than that in the deep sea, but
12、 on is consistent. When barotropic tidal current has the same direction as circulation, the value of (absolute value) and are larger. Furthermore the difference of impaction between flood current case and ebb current case on the amplitude and shape of the first soliton is small, but on nonlinear evo
13、lution process of internal solitary waves is lager.On the basis of simulation of internal solitary waves, the simulation research of SAR signatures of the large-amplitude internal solitary waves is made. A new simulation model of SAR signatures of internal solitary waves is put forward by us, which is based on continuous stratified ocean model. In contrast with the simulation results of SAR signatures on the basis of two-layer ocean model, either under HH(Horizontal) or VV(Vertical) polarization, the substantial improvement in simulation of the half
