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Editorial

机译：社论

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摘要

This issue touches on a broad range of hydrographic interests but all of the topics covered are important to the development of the profession. Approaches to tidal modelling using GPS comes to us from a commercial source. In this the particular difficulties of obtaining tidal heights in the offshore are discussed. Reference to GPS brings with it the matter of choice of vertical datums. Also concerned with the problem of obtaining precise depth measurement is a paper discussing the prediction of sandwave dynamics in the shallow North Sea off the Netherlands. To all those countries with a mobile sedimentary seafloor a knowledge of how the sea floor topography is actually changing is critical. Particularly where shipping is passing through areas with very marginal underkeel clearance. The Netherlands has been most active in developing models that will assist in the prediction of these changes and this paper discusses different approaches that are being taken to improve the predictions.
机译：这个问题涉及广泛的水文学兴趣，但是涵盖的所有主题对于该行业的发展都很重要。使用GPS进行潮汐建模的方法来自商业渠道。在此讨论了在海上获得潮汐高度的特殊困难。对GPS的引用带来了垂直基准的选择问题。另一个与获得精确的深度测量有关的问题是讨论荷兰北部浅海中砂波动力学预测的论文。对于所有具有移动式沉积海底的国家而言，了解海床地形如何实际变化至关重要。特别是在船运通过的龙骨间隙很小的区域。荷兰一直在最积极地开发有助于预测这些变化的模型，因此本文讨论了为改进预测所采用的不同方法。

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