杭州湾南岸岸线变化对水动力的影响累积效应
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摘要
基于FVCOM数值模型,针对杭州湾南岸区域,采用移动固边界的方法,对1984年、2010年以及2020年(规划岸线)3个不同时期杭州湾南岸区域的岸线地形进行了模拟,计算了各个时期水动力场。通过对比发现,在人工及自然因素长期对近岸岸线地形的共同改变作用下,金塘水道区域3个时期水动力场有较显著变化。分析宁波舟山海域间水道的三个过流断面的流量发现,3个年代流量有累积变化的趋势。经过进一步分析可推测,在落潮流挟沙能力足够的条件下,水动力的变化可能会进一步加剧南岸及金塘水道区域宁波港(镇海区、北仑区)的淤积,从而影响该区域港口航道的正常使用。
Hydrodynamic fields are computed with the topography of the year 1984,2010 and 2020 based on FVCOM model. The hydrodynamic changes near the waterways of Zhoushan and Jintang are studied in details. By comparison,the hydrodynamic fields near Jintang Channel have some significant changes owing to natural and human factors. Analysis on the three Section Runoff in the channel of Ningbo-Zhoushan sea area,it can be easily found that the flow in the three periods has a cumulative effect. After further analysis,it can be assumed that the change of the hydrodynamic field may cause sediment deposition along southern coast of Hangzhou Bay and the port of Ningbo on the condition that the sediment-carrying capacity of flow at low tide is enough,and it would affect the use of the harbor nearby.
Hydrodynamic fields are computed with the topography of the year 1984,2010 and 2020 based on FVCOM model. The hydrodynamic changes near the waterways of Zhoushan and Jintang are studied in details. By comparison,the hydrodynamic fields near Jintang Channel have some significant changes owing to natural and human factors. Analysis on the three Section Runoff in the channel of Ningbo-Zhoushan sea area,it can be easily found that the flow in the three periods has a cumulative effect. After further analysis,it can be assumed that the change of the hydrodynamic field may cause sediment deposition along southern coast of Hangzhou Bay and the port of Ningbo on the condition that the sediment-carrying capacity of flow at low tide is enough,and it would affect the use of the harbor nearby.
引文
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[2]李伯根.宁波市海域泥沙冲淤和岸滩演变分析报告[R].杭州:杭州国海海洋工程勘测设计研究院,2013.
[3]曹沛奎,谷国传,董永发,等.杭州湾泥沙运移的基本特征[J].华东师范大学学报:自然科学版,1985(3):75-84.
[4]李伯根.宁波市海域泥沙冲淤和岸滩演变分析报告[R].杭州:杭州国海海洋工程勘测设计研究院,2013.
[5]陆荣华,于东生,杨金艳,等.围(填)海工程对厦门湾潮流动力累积影响的初步研究[J].台湾海峡,2011,30(2):165-174.
[6]曾相明,管卫兵,潘冲.象山港多年围填海工程对水动力影响的累积效应[J].海洋学研究,2011,29(1):73-82.
[7]熊伟,刘必劲,孙昭晨,等.宁波舟山近海三维潮汐潮流数值模拟[J].水道港口,2011,32(6):399-407.
[8]叶慧明.宁波建设用海水文泥沙报告[R].宁波:宁波市海洋环境监测中心,2010.
[9]逢自安.浙江北仑深水港区岸滩冲淤规律与岸线规划利用[J].海洋通报,1992,11(1):41-48.
[10]KOUTITAS C G.Mathematical models in coastal engineering[M].London:Pentech Press,1988.
[11]宋志尧.平面潮流数值模拟中底床摩阻系数的修正[J].水动力学研究与进展,2001,16(1):56-61.
[12]杨金中,赵玉灵,王毅.杭州湾南、北两岸潮滩变迁遥感动态调查[J].地质科学,2004,39(2):168-177.