An Improved Coupling of Numerical and Physical Models for Simulating Wave Propagation简

An improved coupling of numerical and physical models for simulating 2D wave propagation is developed in this paper. In the proposed model, an unstructured finite element model （FEM） based Boussinesq equations is applied for the numerical wave simulation, and a 2D piston-type wavemaker is used for the physical wave generation. An innovative scheme combining fourth-order Lagrange interpolation and Runge-Kutta scheme is described for solving the coupling equation. A Transfer function modulation method is presented to minimize the errors induced from the hydrodynamic invalidity of the coupling model and/or the mechanical capability of the wavemaker in area where nonlinearities or dispersion predominate. The overall performance and applicability of the coupling model has been experimentally validated by accounting for both regular and irregular waves and varying bathymetry. Experimental results show that the proposed numerical scheme and transfer function modulation method are efficient for the data transfer from the numerical model to the physical model up to a deterministic level.     

An Improved Coupling of Numerical and Physical Models for Simulating Wave Propagation

An improved coupling of numerical and physical models for simulating 2D wave propagation is developed in this paper. In the proposed model, an unstructured finite element model (FEM) based Boussinesq equations is applied for the numerical wave simulation, and a 2D piston-type wavemaker is used for the physical wave generation. An innovative scheme combining fourth-order Lagrange interpolation and Runge-Kutta scheme is described for solving the coupling equation. A Transfer function modulation method is presented to minimize the errors induced from the hydrodynamic invalidity of the coupling model and/or the mechanical capability of the wavemaker in area where nonlinearities or dispersion predominate. The overall performance and applicability of the coupling model has been experimentally validated by accounting for both regular and irregular waves and varying bathymetry. Experimental results show that the proposed numerical scheme and transfer function modulation method are efficient for the data transfer from the numerical model to the physical model up to a deterministic level.     

黄骅含油气裂谷盆地第三系地下水化学场及其形成演化模式

本文揭示了第三系沉积体系地下水化学的基本特征及其在正向、斜向上的水化学分带性,从古代和现代水文地质条件分析,论证了现代水化学场是遵循浓缩盐化、正向变质和稀释淡化、反向变质两种格局形成演化的,指出第三系地下水现代化学业已演化成熟,并概括了形成演化模式。     

辽东地区赛马矿床中首次发现独立铌钽矿物

通过扫描电镜和电子探针在赛马铌钽矿床识别出独立铌钽矿物, 种类主要为铈铌钙钛矿、钙铌矿及铌钛铀矿. 该发现回答了对辽东地区是否存在独立铌钽矿物的质疑. 根据全岩Sr-Nd-Pd同位素分析结果推断该铌钽矿床的成矿过程与富集地幔有关, 同时有部分地壳物质的混入.     

同位素方法在局部排泄源水文地质属性研究中的应用--以新疆准噶尔盆地北部顶山地区为例

本文在研究新疆准噶尔盆地北部地区天然水氢氧同位素水文地球化学特征的基础层上,探讨了同位素方法在顶山地区局部排泄源水文地质属性研究中的应用.氢氧同位素水文地球化学特征研究表明,盐池和二连洼地局部排泄源归属于老第三系含水层和受深大断裂控制的基底裂隙含水带共同排泄;黄花沟局部排泄源归属于老第三系含水层排泄;公安农场局部排泄源归属于老第三系含水层和第四系含水层的混合排泄.     

滇东南金石坡锌铜矿床控矿特征及找矿方向

金石坡Zn、Cu矿床位于著名的滇东南都龙环形旋扭构造西南侧,属都龙矽卡岩型锡石多金属矿田部份,矿质来源于老君山燕山早期的花岗岩基。文章通过对金石坡矿区大量探采工程及周边矿区资料的综合研究,深入剖析了构造、岩性,围岩圈闭条件对矿床规模大小、富集程度的制约;探讨了南北矿带中矿床沿平、剖面的总体展布规律与控矿特征;提出了金石坡锌铜矿床三位一体控矿组合,其中尤以层间滑动带通过碳酸盐岩不同岩石界面为最佳;在此基础上,重点指出了南北矿带中同类型矿床寻找的有利部位,同时对整个环形旋扭构造不同区域、不同矿种的构造控矿特征作了有益的探讨、预测。     

Numerical investigation of the effect of current on wave focusing

In the present study,a numerical wave tank is developed to simulate the nonlinear wave-current interactions based on High Order Spectral(HOS) method.The influences of current on wave focusing are investigated by use of numerical model.The current is assumed to be constant in space.Focused waves with different amplitudes and frequency spectra are simulated with and without current.The focused wave characteristics,such as surface elevation,the maximum crest and frequency spectrum,with different current are compared.The results show that the opposing current increases the maximum crest and the energy transform during wave focusing process,and vice versa for the following current.     

Hydroelastic Investigation on A Pile Breakwater Integrated with A Flexible Tail for Long-Wave Attenuation

A novel concept of wave attenuator is proposed for the defense of long waves, through integrating a flexible tail to the lee-side surface of a pile breakwater. The flexible tail works as a floating blanket made up of hinged blocks, whose scale and stiffness can be easily adjusted. A two-phase-flow numerical model is established based on the open-source computational fluid dynamics (CFD) code OpenFOAM to investigate its wave attenuation performance. Incompressible Navier—Stokes equations are solved in the fluid domain, where an additional computational solid mechanics (CSM) solver is embedded to describe the elastic deformation of the floating tail. The coupling of fluid dynamics and structural mechanics is solved in a full manner to allow assess of wave variation along the deforming body. The accuracy of the numerical model is validated through comparison with experimental data. Effects of the flexible tail on performance of the pile breakwater are investigated systematically. Dynamic behaviours of the tail are examined, and characteristics of its natural frequency are identified. For safety reasons, the wave loads impacting on the main body of the pile breakwater and the stress distribution over the tail are specially examined. It is found that both the length and stiffness of the tail can affect the wave-attenuation performance of the breakwater. A proper choice of the length and stiffness of the tail can greatly improve the long-wave defending capability of the pile breakwater. The maximum stress over the flexible tail can be restrained through optimising the deformation and stiffness of the tail.