A nearshore wave breaking model   总被引：4，自引：0，他引：4  

Li Shaowu  Wang Shangyi  Tomoya Shibayama 《海洋学报(英文版)》1998,17(1):121-132

ＡｎｅａｒｓｈｏｒｅｗａｖｅｂｒｅａｋｉｎｇｍｏｄｅｌＬｉＳｈａｏｗｕ,ＷａｎｇＳｈａｎｇｙｉ,ＴｏｍｏｙａＳｈｉｂａｙａｍａ（ＲｅｃｅｉｕｅｄＯｃｔｏｂｅｒ８,１９９６;ａｃｃｅｐｔｅｄＦｅｂｒｕａｒｙ２６,１９９７）Ａｂｓｔｒａｃｔ－Ａｗａｖｅｂ...  相似文献   

Numerical model for solving Bousiinesq-type equations: comparison and validation     

Zou Shili  Xu Benhe 《海洋学报(英文版)》1998,17(3):375-386

ＮｕｍｅｒｉｃａｌｍｏｄｅｌｆｏｒｓｏｌｖｉｎｇＢｏｕｓｉｉｎｅｓｑ－ｔｙｐｅｅｑｕａｔｉｏｎｓ：ｃｏｍｐａｒｉｓｏｎａｎｄｖａｌｉｄａｔｉｏｎＺｏｕＳｈｉｌｉａｎｄＸｕＢｅｎｈｅ（ＲｅｃｅｉｖｅｄＭａｙ２０,１９９７;ａｃｃｅｐｔｅｄＡｕｇｕｓｔ１...  相似文献   

双曲余弦海脊上海啸俘获波的解析与数值研究   总被引：4，自引：3，他引：1  

王岗  胡见  王培涛  张振伟 《海洋学报》2018,40(5):15-23

海啸能被大洋海脊引导以俘获波的形式沿其传播上万千米,且因其特殊的运动方式,携带巨大能量影响远场地区的港口,严重威胁海岸安全。本文首先基于线性浅水方程,推导了双曲余弦平方海脊上俘获波的波面解,其为μ阶ν次的连带勒让德函数的第一类解和第二类解的组合。进一步推导出其对应的频散关系,其中对于确定的频率ω,存在无穷多个波数k_y与之对应。采用MIKE21-BW模型,模拟了产生于海脊脊顶处的海啸在理想双曲余弦平方海脊上的传播变形过程。结果表明,小部分能量以自由先驱波进行传播,海啸波的波能大部分被海脊俘获。海脊俘获波沿着海脊方向为行进波,随着海啸波传播时间的增加,波浪在沿着海脊方向的延展范围也逐渐增大,波高逐渐减小、波的个数逐渐增加。俘获波能量主要由不同频率以相同速度传播的具有孤立波特性的波浪成分和能量主要集中在特定频率范围内的波浪成分组成。  相似文献   

海啸在冲绳海槽和东海浅水大陆架地形上产生和传播的数值模拟   总被引：1，自引：0，他引：1  

李伟  朱元清  王本龙  宋治平 《地震地磁观测与研究》2007,28(5):138-142

运用数值模拟的方法对在冲绳海槽产生9.0级地震,并引发海啸的过程和海啸波在东海浅水大陆架地形上的传播过程进行研究.模拟的结果表明,数值模拟产生的波浪符合海啸波的特点,东海浅水大陆架适合海啸波的传播.  相似文献   

2-D Composite Model for Numerical Simulations of Nonlinear Waves   总被引：8，自引：3，他引：5  

QI Peng 《中国海洋工程》2000,14(1):113-120

—A composite model,which is the combination of Boussinesq equations and Volume of Fluid(VOF)method,has been developed for 2-D time-domain computations of nonlinear waves in a large re-gion.The whole computational region Ω is divided into two subregions.In the near-field around a struc-ture,Ω_2,the flow is governed by 2-D Reynolds Averaged Navier-Stokes equations with a turbulenceclosure model of k-εequations and numerically solved by the improved VOF method;whereas in thesubregion Ω_1(Ω_1=Ω-Ω_2) the flow is governed by one-D Boussinesq equations and numerically solvedwith the predictor-corrector algorithm.The velocity and the wave surface elevation are matched on thecommon boundary of the two subregions.Numerical tests have been conducted for the case of wave propa-gation and interaction with a wave barrier.It is shown that the composite model can help perform efficientcomputation of nonlinear waves in a large region with the complicated flow fields near structures taken in-to account.  相似文献   

高阶Boussinesq类方程数值求解及试验验证     

周俊陶  林建国  谢志华 《海洋工程》2007,25(1):88-92

基于二阶非线性与色散的Boussinesq类方程,采用改善的Crank-Nicolson方法对不同情况下淹没潜堤上的波浪传播进行数值模拟。高阶方程与传统、改进型的Boussinesq方程计算结果进行比较,高阶方程的计算结果与实验吻合得更好。表明该高阶Boussinesq方程能够精确预测变水深、强非线性的复杂波况,可用于实际近岸海域波浪问题的计算。  相似文献   

一种新型二阶全非线性Boussinesq方程及其数值验证     

胡金鹏  朱良生 《海洋通报》2007,26(1):82-88

通过改进二阶全非线性 Boussinesq 波浪方程中的色散项,得到了一组没有改变原方程的数学形式但适用于更大变化水深的新方程,其色散性能和变浅性能都比原方程有了很大改进,所适用的水深范围更大,能更好地描述从深水到近岸浅水处的波浪传播;并基于新方程建立了波浪数值模型,通过模拟波浪从浅水到深水的传播变形来验证新方程的有效性.  相似文献   

Regional estimation of catchment‐scale soil properties by means of streamflow recession analysis for use in distributed hydrological models          下载免费PDF全文

Olivier Vannier  Isabelle Braud  Sandrine Anquetin 《水文研究》2014,28(26):6276-6291

The estimation of catchment‐scale soil properties, such as water storage capacity and hydraulic conductivity, is of primary interest for the implementation of distributed hydrological models at the regional scale. This estimation is generally performed on the basis of information provided by soil databases. However, such databases are often established for agronomic uses and generally do not document deep‐weathered rock horizons (i.e. pedologic horizons of type C and deeper), which can play a major role in water transfer and storages. Here, we define the Drainable Storage Capacity Index (DSCI), an indicator that relies on the comparison between cumulated streamflow and precipitation to assess catchment‐scale storage capacities. DSCI is found to be reliable to detect underestimation of soil storage capacities in soil databases. We also use the streamflow recession analysis methodology defined by Brutsaert and Nieber in 1977 to estimate water storage capacities and lateral saturated hydraulic conductivities of the nondocumented deep horizons. The analysis is applied to a sample of 23 catchments (0.2–291 km²) located in the Cévennes‐Vivarais region (south of France). For regionalization purposes, the obtained results are compared with the dominant catchment geology and present a clear hierarchy between the different geologies of the area. Hard crystalline rocks are found to be associated with the thickest and less conductive deep soil horizons. Schist rocks present intermediate values of thickness and of saturated hydraulic conductivity, whereas sedimentary rocks and alluvium are found to be less thick and most conductive. These results are of primary interest in view of the future set‐up of distributed hydrological models over the Cévennes‐Vivarais region. Copyright © 2013 John Wiley & Sons, Ltd.  相似文献   

An explicit finite difference model for simulating weakly nonlinear and weakly dispersive waves over slowly varying water depth   总被引：2，自引：0，他引：2  

Xiaoming Wang  Philip L.-F. Liu 《Coastal Engineering》2011

In this paper, a modified leap-frog finite difference (FD) scheme is developed to solve Non linear Shallow Water Equations (NSWE). By adjusting the FD mesh system and modifying the leap-frog algorithm, numerical dispersion is manipulated to mimic physical frequency dispersion for water wave propagation. The resulting numerical scheme is suitable for weakly nonlinear and weakly dispersive waves propagating over a slowly varying water depth. Numerical studies demonstrate that the results of the new numerical scheme agree well with those obtained by directly solving Boussinesq-type models for both long distance propagation, shoaling and re-fraction over a slowly varying bathymetry. Most importantly, the new algorithm is much more computationally efficient than existing Boussinesq-type models, making it an excellent alternative tool for simulating tsunami waves when the frequency dispersion needs to be considered.  相似文献   

近岸波浪在刚性植被区域传播的数值模型   总被引：2，自引：0，他引：2  

王磊  房克照  尹晶  孙家文 《海洋工程》2015,33(6):62-69

基于扩展型Boussinesq水波方程,建立了波浪在刚性植被覆盖的近岸海域传播的数值模型。通过在动量方程源项中引入拖曳阻力项考虑植被对波浪的衰减作用。控制方程采用有限差分和有限体积混合格式求解,模型稳定性强,具备间断捕捉能力,能有效模拟近岸区域波浪的传播变形、破碎和处理海岸动边界问题。利用所建立模型对典型物理模型实验进行模拟,计算结果与实验结果吻合良好,表明模型可用于波浪在刚性植被覆盖海域的数值计算。  相似文献