A mathematical model of spit growth and barrier elongation : application to Fire Island Inlet (USA) and Badreveln Spit (Sweden)
A mathematical model of spit growth and barrier elongation : application to Fire Island Inlet (USA) and Badreveln Spit (Sweden)
复制标题
沙嘴生长和屏障伸长的数学模型：应用于 Fire Island Inlet（美国）和 Badreveln Spit（瑞典）
DOI：
10.1016/j.ecss.2011.05.033
复制
发表时间：
2011
影响因子：
2.8
通讯作者：
S.
中科院分区：
文献类型：
--
作者：
Hoan;L.X.Hanson;H.Larson;M.;Kato;S.
基于Kraus（1999）提出的汊道生长模型，建立了由沿岸输沙补给的汊道（任意宽度）生长和拦门沙伸长的数学模型。基本的控制方程是沙的守恒方程，其中，在生长过程中，沙嘴的宽度被假定为常数。根据入口通道深度与沿岸输沙深度之比，估算了沿岸输沙口的部分。由于入口水流以及其他泥沙沉降（例如，#21453;，都考虑到了。在火岛入口，美国，并在Badreveln Spit，瑞典，吐伸长的测量数据被用来验证模型。模拟结果与实测数据吻合良好，在两个研究地点，在火岛吐增长的入口流量的限制，在Badreveln吐的增长是不受限制的。对火岛进口的模型计算表明，为维持航道航行而进行的疏浚是火岛拦门沙1954 ~ 1994年出现稳定期的主要原因。在本研究中获得的火岛入口东侧的平均年净沿岸输送率约为220，000 m3/年，其中约165，000 m3/年（净沿岸输送量的75%）沉积在入口中，为沙嘴生长提供营养，而剩余部分（25%）则通过落潮浅滩复合体绕过下流。
A mathematical model of spit growth and barrier elongation adjacent to an inlet (of arbitrary width), supplied by sediment coming from longshore sediment transport, was developed based on the spit growth model proposed by Kraus (1999). The fundamental governing equation is the conservation equation for sand, where the width of the spit is assumed constant during growth. The portion of the longshore sediment transport feeding the spit has been estimated based on the ratio between the depth of the inlet channel and the depth of active longshore transport. Sediment transport from the channel due to the inlet flow, as well as other sinks of sand (e.g., dredging), are taken into account. Measured data on spit elongation at Fire Island Inlet, United States, and at Badreveln Spit, Sweden, were used to validate the model. The simulated results agree well with the measured data at both study sites, where spit growth at Fire Island was restricted by the inlet flow and the growth at Badreveln Spit was unrestricted. The model calculation for Fire Island Inlet indicates that the dredging to maintain channel navigation is the major reason for the stable period observed from 1954 to 1994 at the Fire Island barrier. The average annual net longshore transport rate at the eastern side of the Fire Island inlet obtained in this study was about 220,000m3/yr, of which approximately 165,000 m3/yr (75% of the net longshore transport) is deposited in the inlet feeding the spit growth, whereas the remaining portion (25%) is bypassed downdrift through the ebb shoal complex.