Global conservative solutions for a model equation for shallow water waves of moderate amplitude

Global conservative solutions for a model equation for shallow water waves of moderate amplitude
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中等振幅浅水波模型方程的全局保守解

DOI:
10.1016/j.jde.2013.11.011
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发表时间:
2014-03
影响因子:
2.4
通讯作者:
Mu, Chunlai
Mu, Chunlai
中科院分区:
数学2区
文献类型:
--
作者:
Zhou, Shouming;Mu, Chunlai

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本文研究了浅水区中等振幅表面波方程在波浪破碎后解的延拓问题(在文献[11]中,Constantin和Lannes证明了该方程包含波浪破碎现象)。我们的方法是基于Bressan和Constantin [2]提出的方法。通过引入一组新的自变量和因变量,解决了由于可能的波浪破碎的所有奇异性,演化问题被重写为一个半线性系统。作为压缩变换的不动点,得到了半线性系统的局部存在性。此外,该公式允许在碰撞时间之后继续求解,给出了能量几乎在所有时间都守恒的全局保守解。最后,回到原始变量,我们得到了一个整体保守解的半群,它连续依赖于初始数据。
In this paper, we study the continuation of solutions to an equation for surface water waves of moderate amplitude in the shallow water regime beyond wave breaking (in [11], Constantin and Lannes proved that this equation accommodates wave breaking phenomena). Our approach is based on a method proposed by Bressan and Constantin [2]. By introducing a new set of independent and dependent variables, which resolve all singularities due to possible wave breaking, the evolution problem is rewritten as a semilinear system. Local existence of the semilinear system is obtained as fixed points of a contractive transformation. Moreover, this formulation allows one to continue the solution after collision time, giving a global conservative solution where the energy is conserved for almost all times. Finally, returning to the original variables, we obtain a semigroup of global conservative solutions, which depend continuously on the initial data.
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