长江河口波-流共同作用下的全沙数值模拟

丁平兴; 胡克林; 孔亚珍; 朱首贤

长江河口波-流共同作用下的全沙数值模拟

华东师范大学, 河口海岸国家重点实验室, 上海, 200062

基金项目: 国家杰出青年科学基金资助项目(49825161);"九五"国家攻关和上海市重点学科建设项目资助(96-922-03-02).

计量
- 文章访问数: 840
- HTML全文浏览量: 12
- PDF下载量: 1452
- 被引次数: 0
出版历程
- 收稿日期: 2002-08-16
- 修回日期: 2002-11-25

Numerical simulation of total sediment under waves and currents in the Changjiang Estuary

State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China

摘要

摘要: 针对长江河口地形、水文、泥沙运动等复杂的特点,建立了波-流共同作用下的二维全沙及河床演变模型.在合理计算研究区域流场等的基础上,利用切应力概念确定悬沙扩散方程中的源函数;通过系列数值试验和实测资料的统计分析,在经典的泥沙临界起动速度中引入反映河床底质结构及固结程度的局地系数;选用由流速、盐度、含沙量浓度确定的泥沙颗粒絮凝沉降速度,从而提高长江口悬沙场数值模拟精度.在底沙输运计算中,提出一种较为合理确定有关参数的方法.通过洪、枯季大、中、小潮水文、泥沙资料和典型台风引起航槽冲淤变化的实测资料验证,表明该文提出的模型能较合理地反映长江河口流场、泥沙场及地形的演变.
- 波-流共同作用 /
- 悬沙和底沙 /
- 数值模拟
Abstract: According to the characteristics of the complicate bathymetry,hydrology and sediment movement in the Changjiang Estuary,a two-dimensional numerical model for total sediment transport and sedbed evolution under waves and currents are developed.Based on the rational calculation of currents in the study area,the method of shear stress is adopted to determine the source function in the suspended sediment diffusion equation.Through a series of the numerical experiments and the statistical analyses of the observed field data,a local coefficient,which can reflect the bottom material and consolidation,is introduced into the classic critical erosion velocity of the sediment. The floc settling velocity of sediment particles is taken as the function of current velocity,salinity and suspended sediment concentration,which can improve the calculation precision of the suspended sediment numerical simulation in the Changjiang Estuary.In the computation of bed-load sediment transport,a rational method for determining the related parameters is developed.The verification of hydrology and sediment data shows that the model can preferably reflect the current field,sediment field and bathymetry evaluation in the Changjiang Estuary.
- waves and currents /
- suspended sediment and bed-load sediment /
- numerical simulation

HTML全文

参考文献(27)

赵棣华,谭仁忠,谭维炎.长江口南支河段悬移质含沙量计算模型[J].泥沙研究,1990,2:54-62.

徐建益,陶学为,方良田,等.长江口南支非均匀沙垂向分层的数学模型[J].泥沙研究,1995,2:74-79.

刘卓,郭东建,朱江,等.长江口自适应网格的构造与水流和泥沙冲淤的数学模拟的初步研究[J].海洋学报,1999,21(4):96-105.

时钟,周洪强.长江口北槽口外悬沙浓度垂线分布的数学模拟[J].海洋工程,2000,18(3):57-62.

窦希萍,李堤来,窦国仁.长江口全沙数学模型[J].水利水运科学研究,1999,2:136-145.

窦国仁,董风舞,DOU Xi-ping.潮流和波浪的挟沙能力[J].科学通报,1995,40(5):443-436.

曹祖德,王桂芬.波浪掀沙、潮流输沙的数值模拟[J].海洋学报,1993,15(1):107-118.

窦国仁,董风舞,窦希萍.河口海岸泥沙数学模型研究[J].中国科学(A辑),1995,25(9):995-1 000.

丁平兴,史峰岩,孔亚珍.潮滩上波一流共同作用下泥沙扩散模型的研究[A].第八届全国海岸工程学术研讨会论文集:下册[C].北京:海洋出版社,1997.754-761.

辛文杰.潮流、波浪综合作用下河口二维悬沙模型[J].海洋工程,1997,15(1):30-47.

马福喜,李文新.河口水流、波浪、潮流、泥沙、河床变形二维数学模型[J].水利学报,1999,5:39-43.

白玉川,顾元棂,蒋昌波.潮流波浪联合输沙及海床冲淤演变的理论体系与其数学模拟[J].海洋与湖沼,2000,31(2):186-196.

丁平兴,孔亚珍,朱首贤,等.波一流共同作用下的三维悬沙输运数学模型[J].自然科学进展,2001,11(2):147-152.

VRIEND De H J. Two-dimensional horizontal and weakly three-dimensional models of sediment transport due to waves and currents[A]. Coastal, Estuarial and Harbor Engineers ‘ Reference Book[M]. London: E & FN Spon, 1994. 215.

LOU J, RIDD P V. Modelling of suspended sediment transport in coastal areas under waves and currents[J]. Estuarine,Coastal and Shelf Science, 1997, 45(1): 1-16.

CLARKE S, ELLIOFT A J. Modelling suspended sediment concentration in the Firth[J]. Estuarine, Coastal and Shelf Science, 1998, 47: 235-250.

史峰岩,孔亚珍,丁平兴.潮滩海域边界适应网格潮流数值模型[J].海洋工程,1998,16(3):68-75.

史峰岩,孔亚珍,丁平兴.流速逆变张量隐式求解方法及其在航道港池流场中的应用[J].海洋学报,1998,20(4):17-24.

SMITH S D. Wind stress and heat flux over the ocean in gale force wind[J]. J P O, 1980, 10: 709-726.

DING Ping-xing, SHI Feng-yan, KONG Ya-zhen. A three-dimensional diffusion equation of suspended sediment by waves and currents[J]. Chinese Science Bulletin, 1999, 44(19): 1 814-1 817.

武汉水利电力学院.河流动力学[M].北京:中国工业出版社,1960.44-60.

沙玉清.泥沙运动学引论[M].北京:中国工业出版社,1965.

彭润泽,蒋如琴,黄永健,等.长江口泥沙絮凝沉速实验研究[M].北京:科学出版社,1987.

钱宁,万兆惠.泥沙运动力学[M].北京:科学出版社,1991.

窦国仁,赵士清,黄亦芬.河道二维全沙数学模型的研究[J].水利水运科学研究,1987,2:1-12.

HU Ke-lin, DING Ping-xing, ZHU Shou-xian, et al. 2-D current field numerical simulation integrating Yangtze Estuary with Hangzhou Bay[J]. China Ocean Eng, 2000, 14(1): 89-102.

BRACKBILL J U, STELTMAN J S. Adaptive zoning for singular problems in two dimensions[J]. J Comput Phys, 1982,46: 342-368.

施引文献

资源附件(0)

访问统计

计量

文章访问数: 840
HTML全文浏览量: 12
PDF下载量: 1452
被引次数: 0

姓名
邮箱
手机号码
标题
留言内容
验证码

留言板