检索结果-南通市图书馆

NUMERICAL SIMULATION OF WAVE-INDUCED CURRENT WITH VERTICALLY VARIED RADIATION STRESS

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2010年第2期22卷 254-259页

作者： ZHANG Jing LIANG Bing-chen LI Hua-jun College of Engineering Ocean University of China Qingdao 266100 China

This article analyzes the vertical structure of the onshore current including the wave-induced current by an equation developed for the radiation stress against water depth.A coupled model coherens-sed is adopted to calculate the wave,tidal current,wave-induced current and sediment *** applying the new model to Yangpu Bay,its reliability is *** an ideal coastal domain is defined to simulate the nearshore current and wave setup with normal incident *** numerical and experimental results for the vertical structure show two undertows,also a visible setup in the surf *** demonstrates the importance of the radiation stress in wave-induced currents and mean water levels（set-up/down）.

关键词： coherens-sed radiation stress wave-induced current setup

Modeling of suspended sediment transport with wave-induced longshore current in Huanghe (Yellow) River Delta

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2009年第3期28卷 65-74页

作者： LI Changliang LIANG Bingchen ZHANG Jing College of Petroleum Engineering China University of Petroleum（East China） Qingdao266555 China Engineering College Ocean University of China Qingdao 266100 China

A three-dimensional suspended sediment model （sed） developed by the present authors is coupled with the combinatorial model of coherens （Luyten et al., 1999）（the three-dimensional coupled hydrodynamical-ecological model for Regional and Shelf Seas） and SWAN （Holthuijsen et al., 2004）（the third generation wave model）. SWAN is regarded as a subroutine of coherens and gets time- and space-varying current velocity and surface elevation from coherens. coherens gets time- and space- varying wave relevant parameters provided by SWAN. Effects of wave on current are applied in bottom shear stress, wave-induced depth-dependent radiation stress and surface drag coefficient calculation. At the same time, the damping function of suspended sediment on turbulence is introduced into coherens. So the sediment model sed has feedback on circulation model coherens. The sed obtains current associated parameters from coherens. Then a coupled hydrodynamic-sediment model coherens-sed being able to account for interaction between wave and current is obtained. coherens-sed is adopted to simulate three-dimensional suspended sediment transport in the Huanghe River delta. In terms of simulation results, there is obvious difference between top and bottom layer of wave-induced longshore current. The values of time series of sediment concentration gotten by coherens-sed have, generally, an accepted agreement extent with measurement. Significant wave heights and wave periods obtained by coherens-sed show that wave simulation case with currentts effect can give better agreement extent with measurement than case without current＇s effect. In the meantime, suspended sediment concentration distributing rule obtained by coherens-sed is similar to former researches and measurement.

关键词： Huanghe River delta suspended sediment wave-induced longshore current coherens SWAN coherens-sed

Numerical study of three-dimensional wave-induced longshore current's effects on sediment spreading of the Huanghe River mouth

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2012年第2期31卷 129-138页

作者： LIANG Bingchen ZHAO Hongping LI Huajun WU Guoxiang Key Laboratory of Shandong Province for Ocean Engineering Ocean University of ChinaQingdao 266100China Engineering College Ocean University of ChinaQingdao 266100China

A three-dimensional wave radiation stress is introduced into the hydrodynamic sediment coupled model coherens-sed, which has been developed through introducing wave-enhanced bottom shear stress, wave dependent surface drag coefficient, wave-induced surface mixing, SWAN, damping function of sediment on turbulence, sediment model and depth-dependent wave radiation stress to coherens. The coherens-sed is adopted to study the effects induced by wave-induced three-dimensional longshore current on suspended sediment spreading of the Huanghe River （Yellow River） mouth. Several different cases divided by setting different wave parameters of inputting boundary waves are carried out. The modeling results agree with measurement data. In terms of simulation results, it is easy to know that three-dimensional wave radiation stress plays an obvious role when inputting boundary wave height is stronger than 3 m. Moreover, wave direction also affects the sediment spreading rules of the mouth strongly too.

关键词： Huanghe River mouth three-dimensional wave radiation stress coherens coherens-sed sediment spreading

在线全文

学校读者我要写书评

暂无评论

风暴作用下的近岸悬浮泥沙数值模拟

风暴作用下的近岸悬浮泥沙数值模拟

作者：林俊中国海洋大学

学位级别：硕士

河口、海岸地区资源丰富,交通便利,与人类经济、生活等各个方面息息相关,是当代人类生活、生产、贸易和旅游的主要场所。然而,河口、海岸区位于陆海交汇地带,动力条件多变,人们对海岸、河口地区开发利用的效果,取决于对其中的各种海洋... 详细信息

河口、海岸地区资源丰富,交通便利,与人类经济、生活等各个方面息息相关,是当代人类生活、生产、贸易和旅游的主要场所。然而,河口、海岸区位于陆海交汇地带,动力条件多变,人们对海岸、河口地区开发利用的效果,取决于对其中的各种海洋动力要素以及这些动力条件控制下的物质运动规律的深入了解。其中非常重要的一种物质运动是泥沙运动,泥沙运动引发岸滩演变、港口航道淤积等现象,而风暴被认为是影响泥沙运动,塑造海岸海底地形的重要因素,风暴浪和风暴潮与天文潮流一起,极易引起岸滩侵蚀,掀动底部泥沙,剧烈地改变受灾地区的海岸及海底地貌,严重时会影响海岸工程及航道航运的安全。本文首次在胶南近海使用coherens-sed三维悬沙模式建立了该海域在一般波浪及单纯潮流条件下的悬沙运动模型,并将计算结果与实测资料进行了比对验证,在验证的基础上,本文将coherens-sed三维悬沙模型结合风暴条件下的水文动力模型,计算了胶南近海水域在9711号天气过程中的悬浮泥沙运动情况。并将计算结果与一般波浪及单纯潮流条件下该海域的水文动力及悬沙运动情况进行了比较,进一步分析了风暴对近岸悬沙运动的部分影响机制。结果表明:coherens-sed模式适用于胶南近岸海域的流场及泥沙的三维数值模拟;对比分析得出,风暴过程增强了床面的剪切应力,改变了流场及余流场结构,对近岸海域水体的悬沙含量增加、岸滩地貌改变起到了重要作用。

关键词：风暴悬沙 coherens-sed 数值模拟三维