水东湾地貌形态演变数值模拟
|
摘要
为了研究泻湖型海湾内经常出现的湾中岛的形成机理,应用水平二维潮流、泥沙输移和地形演变耦合模型,对具有典型的沙坝泻湖地貌形态的水东湾的湾中岛的形成和演化进行了数值模拟,成功地模拟出了涨潮三角洲(大洲岛)的形成过程,计算结果与实际地貌形态总体符合。模型中分别考虑了全沙输沙和推移质输沙两种输沙情况。结果表明,水东湾湾中岛是由涨潮流引起的泻湖内泥沙不断淤积而形成的,是一种涨潮三角洲的地貌形态;全沙输沙模式比推移质输沙模式更适合这一地形演化过程的模拟。模拟结果也再现了湾中岛在25 a期间的地形变化过程,这一研究结果为通过计算数值模拟来研究一般海湾的地貌形态的形成机理和演化过程提供了实际算例。
To analyze the formation mechanism of an island in a lagoon-type bay, the coupling model of horizontal2-D tidal current, sediment transport, and terrain evolution is adopted to reproduce the morphological features of Shuidong Bay and the focus is on the formation and evolution of Dazhou Island in Shuidong Bay. The calculation results are consistent with the actual topography. Two models of sediment transport, i.e., total load and bed load sand transport models, are considered. The simulation shows that Dazhou Island in Shuidong Bay is formed by the continuous deposition of silts in the lagoon under the influence of rising tide and is a geomorphic form of flood tide delta. The total load sediment transport model is more suitable for simulating the terrain evolution process than the bed load sediment transport model. This study explores the formation mechanism and evolution process of the general bay morphology through numerical simulation.
To analyze the formation mechanism of an island in a lagoon-type bay, the coupling model of horizontal2-D tidal current, sediment transport, and terrain evolution is adopted to reproduce the morphological features of Shuidong Bay and the focus is on the formation and evolution of Dazhou Island in Shuidong Bay. The calculation results are consistent with the actual topography. Two models of sediment transport, i.e., total load and bed load sand transport models, are considered. The simulation shows that Dazhou Island in Shuidong Bay is formed by the continuous deposition of silts in the lagoon under the influence of rising tide and is a geomorphic form of flood tide delta. The total load sediment transport model is more suitable for simulating the terrain evolution process than the bed load sediment transport model. This study explores the formation mechanism and evolution process of the general bay morphology through numerical simulation.
引文
[1]Lanzoni S,Seminara G.Long-term evolution and morphodynamic equilibrium of tidal channels[J].Journal of Geophysical Research Oceans,2002,107(C1):1-1-1-13.
[2]张心凤.黄茅海水域河床长期演变趋势预测[J].武汉大学学报,2014,47(5):591-598.Zhang Xinfeng.Long-term evolution trend prediction for Huangmaohai Sea river bed[J].Engineering Journal of Wuhan University,2014,47(5):591-598.
[3]李春初,应秩甫,杨干然,等.粤西水东湾潮汐通道-落潮三角洲的动力地貌过程[J].海洋工程,1990,8(2):78-88.Li Chunchu,Ying zhifu,Yang Ganran,et al.Morphodynamic processes of tidalinlet and ebbtidal dela in the barrier-lagoon system:Shuidong area,West Guang Dong Province[J].The Ocean EngIneering,1990,8(2):78-88.
[4]应秩甫.水东潮汐通道和沿岸泥沙输移[J].热带海洋,1988,7(4):55-61.Ying Zhifu.The tidal inlet and coastal sediment transport in shuidong,West Guang Dong Province[J].Tropi Coceanology,1988,7(4):55-61.
[5]冯少金.水东湾潮流特征分析及三维数值模拟[J].应用海洋学学报,2017,36(3):333-340.Feng Shaojin.Tidal current analysis and three dimensional numerical simulation in Shuidong Bay[J].Journal of Applied Oceanography,2017,36(3):333-340.
[6]杨留柱.沙坝澙湖型潮汐汊道双向射流系统研究--以水东湾为例[D].广州:中山大学,2009.Yang Liuzhu.A study on bi-didrection jet of barrier-lagoon tidal inlet-taking Shuidong Lagoon as an example[D].Guangzhou:Zhongshan University,2009.
[7]钱宁,万兆惠.泥沙运动力学[M].北京:科学出版社,1983.Qian Ning,Wan Zhaohui.Sediment Transport Mechanics[M]Beijing:Science Press,1983.
[8]邹志利.海岸动力学[M].北京:人民交通出版社,2009.Zou Zhili.Coastal Hydrodynamics[M].Beijing:China Communications Press,2009.
[9]Long W,Kirby J T,Shao Z.A numerical scheme for morphological bed level calculations[J].Coastal Engineering,2008,5(2):167-180.
[10]Meyer-Perter E.Formulas for bed-load transport[J].Proc of Congress Iahr,1948,3:39-64.
[11]Engelund F,Hansen E.A Monograph on Sediment Transport in Alluvial Sreams[J].Hydrotechnical Construction,1967,33(7):699-703.
[12]罗肇森.水东湾的建港条件及拦门沙航道的开发研究与实践[J].水利水运科学研究,1993,1:1-12.Luo Zhaosen.Conditions for harbour extension in the Shuidong bay and study and practice of its mouth bar channel dredging[J].Hydro-Science and Engineering,1993,1:1-12.
[13]罗年鹏.潮流作用下潮湾地形不稳定性数值模拟[D].大连:大连理工大学,2015.Luo Nianpeng.Numerical simulation of morphology instability in tidal embayments[D].Dalian:Dalian University of Technology,2015.
[14]Harten A.High resolution schemes for hyperbolic conesrvation laws[J].Comput Phys,1983,49:357-393.
[15]季荣耀.水东与博贺沙坝漶湖海岸体系及其演变差异研究[D].广州:中山大学,2009.Ji Rongyao.Study on Characteristics and difference of Shuidong and Bohe barrier-lagoon coastal system[D].Guangzhou:Zhongshan University,2009.
[16]秦福寿,杨泽君,姚姗姗,等.茂名市水东湾综合整治工程对水沙动力影响模拟研究[J].中国港湾建设,2014,3(2):51-56.Qin Fushou,Yang Zejun,YaoShanshan,et al.Numerical modeling of the ompact on hydrodynamics and sedimentation of the Maoming[J].China Harbour Engineering,2014,3(2):51-56.
[2]张心凤.黄茅海水域河床长期演变趋势预测[J].武汉大学学报,2014,47(5):591-598.Zhang Xinfeng.Long-term evolution trend prediction for Huangmaohai Sea river bed[J].Engineering Journal of Wuhan University,2014,47(5):591-598.
[3]李春初,应秩甫,杨干然,等.粤西水东湾潮汐通道-落潮三角洲的动力地貌过程[J].海洋工程,1990,8(2):78-88.Li Chunchu,Ying zhifu,Yang Ganran,et al.Morphodynamic processes of tidalinlet and ebbtidal dela in the barrier-lagoon system:Shuidong area,West Guang Dong Province[J].The Ocean EngIneering,1990,8(2):78-88.
[4]应秩甫.水东潮汐通道和沿岸泥沙输移[J].热带海洋,1988,7(4):55-61.Ying Zhifu.The tidal inlet and coastal sediment transport in shuidong,West Guang Dong Province[J].Tropi Coceanology,1988,7(4):55-61.
[5]冯少金.水东湾潮流特征分析及三维数值模拟[J].应用海洋学学报,2017,36(3):333-340.Feng Shaojin.Tidal current analysis and three dimensional numerical simulation in Shuidong Bay[J].Journal of Applied Oceanography,2017,36(3):333-340.
[6]杨留柱.沙坝澙湖型潮汐汊道双向射流系统研究--以水东湾为例[D].广州:中山大学,2009.Yang Liuzhu.A study on bi-didrection jet of barrier-lagoon tidal inlet-taking Shuidong Lagoon as an example[D].Guangzhou:Zhongshan University,2009.
[7]钱宁,万兆惠.泥沙运动力学[M].北京:科学出版社,1983.Qian Ning,Wan Zhaohui.Sediment Transport Mechanics[M]Beijing:Science Press,1983.
[8]邹志利.海岸动力学[M].北京:人民交通出版社,2009.Zou Zhili.Coastal Hydrodynamics[M].Beijing:China Communications Press,2009.
[9]Long W,Kirby J T,Shao Z.A numerical scheme for morphological bed level calculations[J].Coastal Engineering,2008,5(2):167-180.
[10]Meyer-Perter E.Formulas for bed-load transport[J].Proc of Congress Iahr,1948,3:39-64.
[11]Engelund F,Hansen E.A Monograph on Sediment Transport in Alluvial Sreams[J].Hydrotechnical Construction,1967,33(7):699-703.
[12]罗肇森.水东湾的建港条件及拦门沙航道的开发研究与实践[J].水利水运科学研究,1993,1:1-12.Luo Zhaosen.Conditions for harbour extension in the Shuidong bay and study and practice of its mouth bar channel dredging[J].Hydro-Science and Engineering,1993,1:1-12.
[13]罗年鹏.潮流作用下潮湾地形不稳定性数值模拟[D].大连:大连理工大学,2015.Luo Nianpeng.Numerical simulation of morphology instability in tidal embayments[D].Dalian:Dalian University of Technology,2015.
[14]Harten A.High resolution schemes for hyperbolic conesrvation laws[J].Comput Phys,1983,49:357-393.
[15]季荣耀.水东与博贺沙坝漶湖海岸体系及其演变差异研究[D].广州:中山大学,2009.Ji Rongyao.Study on Characteristics and difference of Shuidong and Bohe barrier-lagoon coastal system[D].Guangzhou:Zhongshan University,2009.
[16]秦福寿,杨泽君,姚姗姗,等.茂名市水东湾综合整治工程对水沙动力影响模拟研究[J].中国港湾建设,2014,3(2):51-56.Qin Fushou,Yang Zejun,YaoShanshan,et al.Numerical modeling of the ompact on hydrodynamics and sedimentation of the Maoming[J].China Harbour Engineering,2014,3(2):51-56.