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arXiv 1701.02576math.AP
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一维旋转浅水方程组经典解的奇性形成与整体存在性

Singularity formation and global existence of classical solutions for one dimensional rotating shallow water system

Bin Cheng, Peng Qu, Chunjing Xie

摘要:

本文研究了在地球物理流体动力学中具有重要意义的一维旋转浅水系统的经典解。主要结果包含两个对比方面。首先,通过研究Riemann不变量的加权梯度,利用物理能量守恒定理,证明了当解超过一定阈值时,经典解的有限时间奇异性形成.事实上,奇异性的形成将发生一个大类的${C}^1$初始数据,其梯度和物理能量可以是任意小的和高阶导数应该是大的。其次,当初值为常值位涡时,通过研究满足一定零条件的拟线性Klein-Gordon方程的等价形式,得到了小经典解的整体存在性.在这个整体存在性结果中,小性条件是根据初始数据的高阶Sobolev范数。

英文摘要:

We study classical solutions of one dimensional rotating shallow water system which plays an important role in geophysical fluid dynamics. The main results contain two contrasting aspects. First, when the solution crosses certain threshold, we prove finite-time singularity formation for the classical solutions by studying the weighted gradients of Riemann invariants and utilizing conservation of physical energy. In fact, the singularity formation will take place for a large class of ${C}^1$ initial data whose gradients and physical energy can be arbitrarily small and higher order derivatives should be large. Second, when the initial data have constant potential vorticity, global existence of small classical solutions is established via studying an equivalent form of a quasilinear Klein-Gordon equation satisfying certain null conditions. In this global existence result, the smallness condition is in terms of the higher order Sobolev norms of the initial data.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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