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The Harmonic Constant Datum Method: Options for Overcoming Datum Discontinuities at Mixed-Diurnal Tidal Transitions

机译:调和常数基准法:克服潮汐混合日变化中基准不连续性的选项

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摘要

The harmonic constant datum (HCD) method is a computationally efficient way of estimating tidal datums relative to mean sea level, without the need to compute long time series. However, datum discontinuities can occur between mixed and diurnal tidal regimes using this method. Solutions to this problem are investigated, with a hypothetical strait that contains a semidiurnal node, using three different procedures: algorithms specifically designed for diurnal tides (DTA), mixed tidal algorithms (MTA) throughout, and cubic polynomial interpolation (CPI) across the diurnal region. DTA creates small discontinuities (≤11% for the strait) in mean higher high water and mean lower low water but does not provide estimates of mean high water or mean low water. MTA gives continuous datums but creates artificial structures in the middle of the diurnal region. CPI provides smooth, continuous datums but does not use the tidal information within the diurnal regions. Which procedure works best depends on the size of the diurnal region and the application. The standard time series method can be used for limited transitional regions requiring high accuracy, with the efficient HCD method used elsewhere. However, the discontinuity issues still exist. Global distributions of datums computed by the HCD method are shown, based on the 0.5° X 0.5° Oregon State University (OSU) TPXO 5.0 tide model.
机译:谐波常数基准(HCD)方法是一种相对于平均海平面估算潮汐基准的计算有效方式,而无需计算长时间序列。但是,使用这种方法,基准潮汐可能会在混合潮汐和日潮态之间发生。使用三个不同的程序,使用一个包含半日节点的假设海峡,研究了该问题的解决方案:专门针对日潮(DTA)设计的算法,整个混合潮汐算法(MTA)和整个日三次立方多项式插值(CPI)区域。 DTA在平均高水位和平均低水位时产生小的不连续性(海峡≤11%),但未提供平均高水位或平均低水位的估算值。 MTA提供连续的基准,但在昼夜区域的中间创建了人工结构。 CPI提供平滑连续的基准,但不使用昼夜区域内的潮汐信息。哪种方法效果最好取决于昼夜区域的大小和应用。标准时间序列方法可用于需要高精度的有限过渡区域,而高效的HCD方法可在其他地方使用。但是,不连续性问题仍然存在。基于0.5°X 0.5°俄勒冈州立大学(OSU)TPXO 5.0潮汐模型,显示了通过HCD方法计算的基准的全局分布。

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