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根据一维线性潮波方程导出了变截面河口中最大潮流与高潮位之间的相位关系,并对其进行了讨论,其中,河口宽度取为B=B_0e~(-bx)深度h=常数。结果表明,在这种变截河口中纯前进潮波的潮流与潮位之间的相位差取决于不同的h、b和频率σ,可以在0—π/2之间变化,而对这种河口中考虑了反射波效应之后的合成潮波,在靠近外海的相当一段距离内也可能出现潮流和潮位之间的相位差小于π/4的情况,这取决于入射波的潮流与潮位之间的相位差以及反射波的衰减情况。因此,在变截面河口中,仅仅根据潮流与潮位之间的相位差接近于零或者接近于π/2来判定潮波是前进波型还是驻波型是值得商榷的。最后,本文提出了一种判定变截面河口中潮波类型的方案。
Based on the one-dimensional linear wave equation, the phase relationship between the maximum tidal current and the high tide level in the variable cross-section estuary is derived and discussed. The width of the estuary is taken as B = B_0e ~ (-bx) depth h = constant. The results show that the phase difference between the tidal current and the tide level of a purely forward tidal wave in this variable-estuary depends on different h, b and frequency σ and can vary from 0 to π / 2, , The synthetic tidal wave after the reflection wave effect is taken into account. The phase difference between the tidal current and the tidal potential may also be smaller than π / 4 within a considerable distance near the open sea depending on the tidal current and tidal level between the incident wave Phase difference and reflected wave attenuation. Therefore, it is debatable whether a tidal wave is an advancing wave or a standing wave in a variable cross-section estuary simply based on the fact that the phase difference between tidal current and tide is close to zero or close to π / 2. Finally, this paper presents a program to determine the type of tidal waves in the variable cross-section of the mouth.