Wave runup on a concentric twin perforated circular cylinder     

K. Vijayalakshmi  S. Neelamani  R. Sundaravadivelu  K. Murali 《Ocean Engineering》2007,34(2):327-336

The regular wave interaction with a twin concentric porous circular cylinder system consisting of an inner impermeable cylinder and an outer perforated cylinder was studied through physical model and numerical model studies. The experiments were carried out on the twin concentric cylinder model in a wave flume to study the wave runup and rundown at the leading and trailing edges of the perforated cylinder. It was found that the maximum wave runup on the perforated cylinder is almost same as the incident wave height. The experimental results were used to develop the predictive formulae for the wave runup and rundown on the perforated cylinder, which can be easily used for design applications. The wave runup profiles around the perforated cylinder for different values of ka and porosities were studied numerically using Green's Identity Method. The results of the numerical study are presented and compared with the experimental measurements.  相似文献   

The Huelva (Spain) Tsunami-Ready Station and Its Interaction with Storm Emma (March 2018)     

Jue Lin-Ye  Begoña Pérez-Gómez  Enrique Álvarez-Fanjul  Javier García-Valdecasas 《Marine Geodesy》2020,43(5):509-539

Abstract

The sea level station operating since 1996 at Mazagón (Huelva, Spain) has been progressively upgraded to fit tsunami warning requirements, due to its location in one of the main regions at risk. Its radar water level sensor was complemented in 2017, with the addition of a pressure sensor. The performance of both sea level sensors and their response to sea level oscillations, at different frequencies, is assessed. Particular emphasis is put on the effect of extreme events, such as Storm Emma, when alternative methods to obtain 1-min data are tested, in contrast to the one based on arithmetic means. The overall differences are small, for the whole period of study (centered-root-mean-square-error below 1?cm, for 5-min, and hourly data; similar tidal parameters and sea level oscillations with periods between 30?s and 5?min). However, during Storm Emma, the pressure sensor presents sensibly lower readings than the radar, with the centered-root-mean-square-error rising to 80?mm on the March 2^nd 2018. A new method to compute 1-min data, based on medians, reduced this value to 10?mm for the same day.  相似文献   

Strength Analysis of Turret Mooring Productive/Storage Tanker     

Zhang Shilian Jin Dexian Associate Professor 《中国海洋工程》1997,(3)

The longitudinal strength of turret mooring productive/storage tanker is studied.A numeri-cal example has been implemented according to the method presented in this paper to give practical il-lustration.From the results of the numerical example,it is concluded that the turret hole located near theforward of the amidships has small effect on the longitudinal strength of the ship hull.As for design ex-treme value of wave bending moment of storage tanker,statistic method is a more reasonablemethodology,especially with the consideration of the servere environmental conditions.The primary esti-mation of design section modulus of turret storage tanker can be determined by this design bending mo-ment.  相似文献   

Parameterization of Wave Breaking Probability and Whitecap Coverage     

李晶于定勇  刘华兴 《中国海洋工程》2006,20(3):411-418

1 .Introduction Wave breaking and associated whitecapping have long beeninteresting due totheir close relationto many fields of ocean study,including air-sea interaction,remote sensing,ocean engineering,aswell as wave dynamics .The breaking probabilityBan…  相似文献   

Three-dimensional numerical simulation of obfique wave action on vertical walls     

LI Benxia YU Xiping YU Yuxiu 《海洋学报(英文版)》2006,25(1):147-153

A three-dimensional numerical model based on the potential theory was developed to study the oblique wave action on vertical walls. A source term inside the domain was used to generate incident waves and outgoing waves were dissipated by sponge layers and transmitted by radiation boundaries. The finite difference method was used to solve the governing equations and boundary conditions in the regular transformed domain in σ-coordinate. Satisfactory agreements between the numerical predictions and experimental results of wave force were obtained. It is concluded that the maximum wave force acting on the vertical walls is induced by the obliquely incident waves rather than the normally incident waves.  相似文献   

SAS测量水体表观光学参数的方法     

李铜基  陈清莲 《海洋技术学报》2003,22(1):10-13,57

SeaWiFS航空模拟器（SAS）是专门为在水面之上测量水体表观光学参数的现场设备。文章在介绍SAS现场测量以及数据处理基本方法的基础上，分析了2002年黄海试验SAS的应用效果，并与剖面法测量数据进行了比对。  相似文献   

用贝叶斯方法推算设计波高     

王起  王超 《海洋预报》1995,12(4):59-66

采用长期概率预报提供波浪要素设计值是海洋工程中不可缺少的内容之一，文中介绍了一种基於贝叶斯原理的新计算方法，它较传统统计方法有明显的优越性，不仅可以通过补充新信息不断修正原有的估算结果，而且可以避免传统方法带来诸多不确定性，文中以北海中部百年一遇设计波高为例进行了计算。  相似文献   

中国海区区域地质编图中重磁图的编制方法     

张训华 《海洋地质与第四纪地质》1994,14(4):95-100

本文简要介绍了局控项目《中国海区１∶５０万区域地质编图（大连幅）》重力异常图、磁力异常图的编制过程，给出了一种以计算机为手段、实现编图自动化的新方法，并分析了该方法与以往编图方法的不同和优点，以国际分幅在中国海区开展区域地质编图尚属首次，在既无海区地质调查规范，又无海区地质调查编图规范的情况下，这一工作无异具有开创性。从理论上系统总结出一套切实可行的编图方法，对于编制中国海区区域地质调查编图规范以  相似文献   

Numerical Investigation on the Generation and Propagation of Irregular Waves in A Two-Dimensional Wave Tank     

Ruey-syanSHIH Chung-renCHOU JohnZ.YIM 《中国海洋工程》2004,18(4):551-566

  相似文献   

长江口区风浪要素计算的探讨   总被引：2，自引：0，他引：2  

何金林 《海洋学研究》1996,14(3):1-7

本文以长江口区波浪实测资料为依据，对目前国内外常用的风浪要素计算方法进行了比较分析，认为就目前资料条件下，最适用于长江口区的、能满足工程设计等要求的风浪要素计算方法为莆田试验站方法（莆田公式）。  相似文献