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首页> 外文期刊>Continental Shelf Research: A Companion Journal to Deep-Sea Research and Progress in Oceanography >Use of 'velocity projection' to estimate the variation of sea-surface height from HF Doppler radar current measurements
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Use of 'velocity projection' to estimate the variation of sea-surface height from HF Doppler radar current measurements

机译：利用“速度投影”从HF多普勒雷达电流测量值估算海面高度的变化

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The technique of 'velocity projection' (J. Geophys. Res. 106 (2001) 6973) is used to estimate the Sea-surface height field and its change over time front measurements of surface velocity made using a shore-based HF Doppler radar over a 30 x 30-km region of the continental shelf located near the mouth of the Chesapeake Bay (USA). projected Current profiles are compared with Measured currents from an array of acoustic Doppler current profilers, and the consistency and sensitivity of the projection to model assumption are also examined. Using projected values of the local surface slope, a model sea-surface eta(x,y) is least-Squares fit over the study region at each Measurement time. The error associated with these fits provides an internal check on the validity of the projection results. The slope of the model sea-surface shows a set-up toward the mouth of the Chesapeake Bay during downwelling-favourable winds and a counterclockwise rotation over the tidal cycle that is consistent with linear, shallow-water dynamics. A time series of sea-level difference extracted from the eta maps shows a dominant M-2 tidal signal that compares well with measurements of bottom pressure made at two moorings. With proper attention to limits of applicability, such projection-based sea-surface slope fields (as well as other projection results) may be useful in diagnostic calculations or as nowcasts for use with prognostic models. (C) 2003 Elsevier Ltd. All rights reserved. [References: 14]
机译：“速度投影”技术（J. Geophys。Res。106（2001）6973）用于估算海面高度场及其随时间的变化，该测量是使用基于岸上的HF多普勒雷达在海面之上进行的位于切萨皮克湾（美国）入口附近的大陆架30 x 30公里区域。将投影的电流剖面与一系列声学多普勒电流剖面仪的测量电流进行比较，还检查了投影对模型假设的一致性和敏感性。使用局部表面坡度的投影值，模型海面eta（x，y）在每个测量时间在研究区域上的最小二乘拟合。与这些拟合相关的误差可对投影结果的有效性进行内部检查。模型海面的坡度显示，在有利于下行风的风中，切萨皮克湾的入海口形成，并且在潮汐周期内逆时针旋转，这与线性浅水动力学一致。从eta映射中提取的海平面差异的时间序列显示了一个主要的M-2潮汐信号，该信号与在两个系泊处进行的底部压力的测量结果很好地比较。在适当注意适用性限制的情况下，此类基于投影的海表面坡度场（以及其他投影结果）在诊断计算中或作为与预测模型一起使用的临近预报可能有用。 （C）2003 Elsevier Ltd.保留所有权利。 [参考：14]

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