Reservoir model of ebb-tidal shoal evolution and sand bypassing
Reservoir model of ebb-tidal shoal evolution and sand bypassing
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退潮滩演化及绕砂储层模型
DOI：
10.1061/(asce)0733-950x(2000)126:6(305
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
N. Kraus
中科院分区：
文献类型：
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作者：
N. Kraus
提出了一种计算滩涂体积变化和过沙速率的数学模型。从概念上和数学上讲，退潮浅滩不同于从浅滩中出现的旁滩，也不同于旁滩与海滩合并的附属滩。通过类比水库系统来计算这些形态实体的体积和绕过速率，其中每个水库可以填充到最大（平衡）体积。输入滨沙输运速率与地貌平衡体积之比是控制地貌演化的关键参数。解析模型给出了与绕砂延迟直接相关的绕砂杆和附砂杆演化时间延迟的显式表达式。对形态变化的预测与在马里兰州海洋城市入口的观测结果一致。通过数值解对模型进行扩展的例子，给出了一个假设的潮汐浅滩开采情况，以及一个理想化的双向海岸沙输送情况，其中产生了向上和向下漂移的旁路沙洲和附属沙洲。
A mathematical model is presented for calculating the change in volume and sand-bypassing rate at ebb-tidal shoals. Conceptually and mathematically, the ebb-tidal shoal is distinguished from bypassing bars that emerge from it and from attachment bars where the bypassing bars merge with the beach. The volumes and bypassing rates of these morphologic entities are calculated by analogy to a reservoir system, where each reservoir can fill to a maximum (equilibrium) volume. The ratio of the input longshore sand transport rate and the equilibrium volume of the morphologic feature is found to be a key parameter governing morphologic evolution. The analytical model gives explicit expressions for the time delays in evolution of the bypassing bar and the attachment bar, which are directly related to the delays in sand bypassing. Predictions of morphology change agree with observations made at Ocean City Inlet, Md. Examples of extension of the model by numerical solution are given for a hypothetical case of mining of an ebb-tidal shoal and for an idealized case of bidirectional longshore sand transport, in which updrift and downdrift bypassing bars and attachment bars are generated.