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中国近海及其邻近海域灾害性海浪的时空分布 总被引：12，自引：1，他引：12
本文依据收集到的中国近海及其邻近海域灾害性海浪观测资料,经统计分析求得中国近海及其邻近海域灾害性海浪的分布及其年际变化和月际变化.本文结果可为中国近海区域海洋学的海浪及有关问题的研究提供基础性的资料,也可为防灾减灾、做好灾害性海浪短期预报和中长期预测提供统计依据. 相似文献
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中国近海2011年灾害性海浪分析及2012年预测 总被引：1，自引：0，他引：1
总结分析了2011年中国近海有效波高为4 m以上的灾害性海浪过程及灾情概况,并对本年度的预测结果进行了检验评估。依据1968—2011年有效波高≧4 m的灾害性海浪的统计资料,结合2012年副热带高压及热带风暴的分析预测资料,预测了2012年中国近海灾害性海浪过程的出现次数,以及分海区的出现天数,预测结果可为今年的海洋防灾减灾提供技术支持。 相似文献
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总结分析了2012年中国近海有效波高≧4 m的灾害性海浪过程及灾情概况,并对2012年度的预测结果进行了检验评估。依据1968—2012年有效波高≧4 m的灾害性海浪的统计资料,结合2013年副热带高压及热带风暴的分析预测资料,预测了2013年中国近海灾害性海浪过程的出现次数,以及分海区的出现天数,预测结果可为今年的海洋防灾减灾提供技术支持。 相似文献
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中国海1997年海浪灾害分析及 1998年海浪灾害预测 总被引：5，自引：2，他引：3
本文主要分析了１９９７年中国近海海浪灾害及灾害性海浪的特征,并对１９９８年中国海灾害性海浪出现天数进行了预测,以供沿海地区及从事海洋开发,渔业、交通运输等事业和企业部门参考。 相似文献
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近年来,海浪灾害是威胁近海民众生命安全最为突出的海洋灾害,对我国造成的经济损失有整体上升的趋势。基于31 a(1986-2016年)汕尾市观测站的热带气旋影响期间白天的海浪数据,本文定义并提取了31次灾害性海浪(1/10大波波高≥4 m)事件。在灾害性海浪发生时,热带气旋主要位于观测站点的西侧(115.57°E以西)。31次灾害性海浪事件集中发生于6-9月;其中,虽然6月份影响研究海域的热带气旋数量相对较少,但引发灾害性海浪的概率约是7-9月份的两倍。有26个热带气旋生成于121°E以东的西太平洋海域,且移动路径相对较集中:途经吕宋海峡(16°-22°N)的热带气旋总数为25个,其中22个热带气旋途经16°-20°N之间,是最为重要的通道。途经此处的热带气旋在汕尾海域引发灾害性海浪的估算概率约为25%-50%。本研究可为汕尾市灾害性海浪的预警报和防灾减灾提供重要的参考。 相似文献
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利用台湾海峡中部2号大浮标2017年全年的实测波浪资料, 对海浪的基本波要素及其与风的相关性、波谱特性进行统计分析, 得出了重要特征波参数之间的回归关系和适合台湾海峡中部的海浪谱形式。研究结果显示: 1) 台湾海峡中部的常浪向是NE向, 强浪向是NNE向, 月均有效波高的变化范围为0.87~2.98m, 7月波高最小, 12月波高最大, 波周期与波高有着相似的月际变化趋势; 2) 主要波浪类型是以风浪为主的混合浪, 谱型上以单峰为主, 波高与风速整体上呈正相关关系, 大浪主要由台风和强劲的东北季风引起; 3) 波浪的平均周期与大部分特征波周期之间具有良好的线性相关性, NNE、NE方向的波浪有效波高和有效波周期线性相关性较强; 4) 相比于Jonswap谱, 规范谱一是更符合本区域的海浪谱模式, 给出了基于有效波高和谱峰周期拟合的规范谱一形式。这些研究成果可为海洋工程设计和波浪数值模拟提供参考。 相似文献
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中国近海及其邻近海域灾害性海浪监测和预报 总被引：6，自引：1，他引：5
本文简要地介绍了中国海灾害性海浪时－空分布,海洋灾害,我国现行的海洋监测系统和预报系统,日常预报所采用的方法和近几年发展起来两个海浪数值预报自动化系统。 相似文献
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用60个波高仪组成2m×2m的方阵,同步测量波面过程,用Doppler声学流速仪获得了二维正向和斜向规则波、二维正向和斜向随机波以及三维随机波浪场中不同水深处的同步Euler水质点速度各方向分量的高精度的时间过程资料.以此为出发点,讨论了分段式造波机生成波浪的周期分布特征,发现三维随机波浪周期分布的μ值与二维随机波浪比较有明显增大的趋势.分别从速度合矢量方向与波向的吻合程度(对二维波浪)、"多点波面"组合与"波面-水质点速度"组合两种方式得到方向谱的吻合程度(对三维随机波浪)等不同角度,论证了分段式造波机产生的波浪的内外部结构的一致性. 相似文献
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CHUANKUN WANG 《Marine Georesources & Geotechnology》2013,31(3):133-150
For Future cross-sea passage spanning the Taiwan Strait, no matter what kind of scheme is adopted, its design, construction, and administration are closely related to marine hydrological and meteorological environmental elements. In this article, based on a great number of observed data, analyses for wave, typhoon, and monsoon conditions in the Taiwan strait region are made and their distributional features and character values are given. Especially, the wave height and occurrence frequencies of disastrous waves are analyzed, and the values of design wave parameters (wave height and period with a given return period) are estimated to use for the reference of the scheme optimization and project preliminary program of cross-sea passage spanning the strait. 相似文献
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Chuankun Wang 《Marine Georesources & Geotechnology》2004,22(3):133-150
For Future cross-sea passage spanning the Taiwan Strait, no matter what kind of scheme is adopted, its design, construction, and administration are closely related to marine hydrological and meteorological environmental elements. In this article, based on a great number of observed data, analyses for wave, typhoon, and monsoon conditions in the Taiwan strait region are made and their distributional features and character values are given. Especially, the wave height and occurrence frequencies of disastrous waves are analyzed, and the values of design wave parameters (wave height and period with a given return period) are estimated to use for the reference of the scheme optimization and project preliminary program of cross-sea passage spanning the strait. 相似文献
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为了研究斜向入射波浪,基于三维不可压缩两相流模型,开发了一套圆形数值波浪水池数值模型。在圆形波浪水池中,通过源项造波法成功生成了任意入射方向的波浪,并且利用人工摩擦项模拟阻尼区以数值耗散反射波浪。模型基于嵌入式多块网格体系,采用FVM法(finite volume method)离散Navier-Stokes方程,VOF法(volume of fluid)追踪自由水面。试验结果表明,斜向入射波浪的模拟结果与理论值基本一致,圆形波浪水池在模拟斜向入射波浪时,有效区域的面积较传统波浪水池显著增大,而且有效区域受波浪入射角度的影响也较小。同时,通过叠加多列斜向入射波浪,模拟出了多向交叉波列,并通过与理论结果对比,发现其具有较高的精度。 相似文献
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Internal inlet for wave generation and absorption treatment 总被引：1，自引：0，他引：1
A new method of implementing, in two-dimensional (2-D) Navier–Stokes equations, a numerical internal wave generation in the finite volume formulation is developed. To our knowledge, the originality of this model is on the specification of an internal inlet velocity defined as a source line for the generation of linear and non-linear waves. The use of a single cell to represent the source line and its transformation to an internal boundary condition proved to be an interesting alternative to the common procedure of adding a mass source term to the continuity equation within a multi-cell rectangular region. Given the reduction of the source domain to a one-dimensional region, this simple new type of source introduced less perturbation than the 2-D source type. This model was successfully implemented in the PHOENICS code (Parabolic Hyperbolic Or Elliptic Numerical Integration Code Series). In addition, the volume of fluid (VOF) fraction was used to describe the free surface displacements. A friction force term was added to the momentum transport equation in the vertical direction, in order to enhance wave damping, within relatively limited number of cells representing the sponge layers at the open boundaries. For monochromatic wave, propagating on constant water depth, numerical and analytical results showed good agreements for free surface profiles and vertical distribution of velocity components. For solitary wave simulation, the wave shape and velocity were preserved; while, small discrepancy in the tailing edge of the free surface profiles was observed. The suitability of this new numerical wave generation model for a two source lines extension was investigated and proven to be innovative. The comparisons between numerical, analytical and experimental results showed that the height of the merging waves was correctly reproduced and that the reflected waves do not interact with the source lines. 相似文献
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徐肇廷 《中国海洋大学学报(自然科学版)》1989,(3)
本文从流体力学基本方程组出发,在非地转条件下导得了分层海洋的内孤立波方程—Kbv和mKdv方程,证实了在非地转条件下,一类海洋非线性波动是可以严格满足内孤立波方程的。在地转条件下采用f平面近似导出了KdV方程的演化形式一有源KdV方程,地转的影响含于源项中。由初步的分析得出,f对KdV方程的影响是微弱的。由已得的KdV和mKdV方程的解可知,内孤立波与线性波有着本质差别。 相似文献
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The pycnocline in a closed domain is tilted by external wind forcing and tends to restore to a level posi- tion when the wind falls. An internal seiche oscillation exhibits if the forcing is weak, otherwise internal surge and internal solitary waves emerge, which serve as a link to cascade energy to small-scale processes. A two-dimensional non-hydrostatic code with a turbulence closure model is constructed to extend previous laboratory studies. The model could reproduce all the key phenomena observed in the corresponding labo- ratory experiments. The model results further serve as a comprehensive and reliable data set for an in-depth understanding of the related dynamical process. The comparative analyses indicate that nonlinear term favors the generation of internal surge and subsequent internal solitary waves, and the linear model predicts the general trend reasonably well. The vertical boundary can approximately reflect all the incoming waves, while the slope boundary serves as an area for small-scale internal wave breaking and energy dissipation. The temporal evolutions of domain integrated kinetic and potential energy are also analyzed, and the results indicate that about 20% of the initial available potential energy is lost during the first internal wave breaking process. Some numerical tactics such as grid topology and model initialization are also briefly discussed. 相似文献