波与波的相互作用对阻塞高压的形成、维持和衰退的影响

CONTRIBUTIONS OF THE NONLINEAR INTERACTIONS AMONG WAVES TO THE FORMATION, PERSISTENCE AND DECAY OF THE BLOCKING

摘要: 采用波数域的动能方程和定常波与瞬变波的波数域动能方程计算了阻塞高压形成、维持和衰退阶段的波与波相互作用项和波与平均运动相互作用项。计算结果表明波与波的非线性相互作用项在阻塞高压形成阶段是促使阻塞高压形成的能源,在维持阶段,是维持其稳定的能源,在衰退阶段又是促使其崩溃的能汇。波与平均运动的相互作用项在衰退阶段也起着促使阻塞高压崩溃的重要作用。定常波与瞬变波的非线性相互作用起着在具体时段使阻塞高压形成、维持和衰退的重要作用。

Abstract: The linear and nonlinear interactions among waves are studied by spectral energy equations. It is found that the formation and persistence of the blocking relate to the supply energy through nonlinear interactions. The decay of the blocking relates to the losing energy through nonlinear interactions.