Subtidal Frequency Fluctuations in Coastal Sea Level in the Mid and South Atlantic Bights: A Prognostic For Coastal Flooding
Subtidal Frequency Fluctuations in Coastal Sea Level in the Mid and South Atlantic Bights: A Prognostic For Coastal Flooding
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中大西洋和南大西洋湾沿海海平面的潮下频率波动：沿海洪水的预测
DOI：
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发表时间：
1996
期刊：
影响因子：
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通讯作者：
L. Pietrafesa
中科院分区：
文献类型：
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作者：
G. Janowitz;L. Pietrafesa
分析模型用于确定沿海海平面的空间和时间变化。该模型开发的粘性参数制度，平流相对涡度可以忽略不计的相对涡度的生产底部埃克曼层泵的潮下频率运动。后者则由地形引起的垂直速度平衡。评估了大气风应力对海岸海平面的影响，发现上升流（下降流）风应力导致初始跨陆架位置下游海岸海平面持续下降（上升），跨陆架剖面和初始位置对下游海岸海平面变化的修正作用也很重要。该模型适用于从马萨诸塞州的伍兹霍尔到北卡罗来纳州的哈特拉斯角，然后到南卡罗来纳州的查尔斯顿的大西洋中部海湾。观察结果和模型结果之间存在合理的一致性，这表明已经建立了预测能力;无量纲均方误差范围为0.122至0.294，6个测试用例的平均值为0.181。该模型可以由几天的预测风来确定沿海洪水的时间，与特定位置的预测天文潮汐的潮下频率模型预测的线性叠加。
An analytical model is used to determine spatial and temporal variations in coastal sea level. The model is developed for subtidal frequency motions in the viscous parameter regime, where advection of relative vorticity can be neglected with respect to production of relative vorticity by bottom Ekman layer pumping. The latter is then balanced by the topographically induced vertical velocity. The effects of the atmospheric wind stress on coastal sea level are assessed; and it is found that an upwelling (downwelling) favorable wind stress causes a continual drop (rise) in coastal sea level downstream from an initial cross-shelf location, with modifying effects of cross-shelf profile and initial location on the downstream variation in coastal sea level also being important. The model is applied over the Mid Atlantic Bight from Woods Hole, Massachusetts to Cape Hatteras, North Carolina and then to Charleston, South Carolina. Reasonable agreement exists between observations and model results which suggests that a predictive capability has been established; dimensionless mean squared errors range from 0.122 to 0.294 with a mean of 0.181 over the six test cases. The model can be driven by several days of forecast winds to determine the timing of coastal flooding, with linear superposition of location specific predicted astronomical tides onto the subtidal frequency model predictions.