黄骅港航道整治与发展前景

文章总结了黄骅港航道淤积特点和防沙减淤整治经验,分析了粉沙质海岸上各港区扩建航道的可行性和合理性。根据黄骅港的发展历程,目前黄骅港建设的起步阶段已经完成,粉沙质海岸建港优势逐渐体现。黄骅港航道整治成功不仅保证黄骅港健康发展,也为其他粉沙质海岸建港提供有益的参考。     

黄骅港外航道整治工程后沿堤流分析

黄骅港整治工程后沿堤流的发展对评价该工程的合理性及指导下一步整治工作至关重要.依据黄骅港现场实测资料,遥感卫片和二、三维水动力数值模拟等结果,阐述黄骅港外航道延堤工程后沿堤流的发展.结果表明:在北偏西风作用下黄骅港防波堤外侧落潮期出现较大沿堤向外水流,其它条件下沿堤流发展不明显;沿堤流不是造成黄骅港外航道淤积的主要原因,黄骅港整治工程后影响航道回淤的决定性因素仍是波浪.     

对黄骅港航道建设的看法

介绍黄骅港目前遇到的航道淤积难题,针对航道淤积问题,通过分析几年来黄骅港航道测量资料,并结合其它港口泥沙回淤问题治理的经验,对黄骅港航道的设计提出看法,对黄骅港航道的管理提出一些行之有效的对策。     

论黄骅港综合港区雷达站建设的必要性

规划建设黄骅港综合港区雷达站,进一步加强黄骅港功能水域水上安全监管是十分迫切和必要的。通过分析阐述了黄骅港发展现状,在VTS系统现状及需求的基础上,提出建设黄骅港综合港区雷达站的必要性。     

黄骅港地区现有坐标系及其相互关系分析

对黄骅港地区现有的1954年北京坐标系、1998年黄骅港城建坐标系和1999年黄骅港港口坐标系进行了详细分析，并推导了三个坐标系之间的相互转换关系式。     

浅谈黄骅港海域泥沙特性及演变

随着黄骅港的建设发展,防波堤、深水航道的不断加深及向海域延伸,势必会对周边海域泥沙运动产生一定的影响。为了研究工程建设后黄骅港海域的泥沙特性,采用卫星遥感技术及现场实测资料分析方法,对黄骅港工程海域沉积物分布、海域含沙量分布、岸线演变及等深线变化进行了分析研究,给出了黄骅港海域沉积物类型及分布情况,以及随工程建设发展的海域悬沙分布情况及近期的岸线演变情况。得出黄骅港外航道的整治工程建设使得黄骅港泥沙特性向着有利于港口发展的方向演变。     

黄骅港疏浚施工对航道回淤的影响

根据粉沙质海岸泥沙运动特点和黄骅港航道施工期回淤特点,分析了黄骅港航道施工期挖泥量、抛泥量、逸泥量、地形变化量之间的关系,建立了回淤量与抛泥量、地形变化量的关系式。利用黄骅港现场实测资料,率定了公式系数,分析了黄骅港航道的施工回淤量、正常回淤量与各影响因素,得到了施工期回淤量受抛泥影响的系数,并发现黄骅港正常回淤量与风能有较好的对应性。     

滨州港外航道骤淤研究及可挖性分析

根据滨州港区水深、水文泥沙等现场观测资料,分析港区水动力变化规律和工程海域海床冲淤态势,论述外航道骤淤及可挖性。结果显示:大风淤积将成为滨州港建港后的重点和难点;在航道尺度和走向与黄骅港基本相同的情况下,滨州港建成后外航道淤积严重程度将超过黄骅港;滨州港外航道挖泥具有一定难度,且恶劣天气情况出现后,-6 m等深线外一定范围出现"铁板砂"现象的可能性极大。根据预判,滨州港回淤物粒径粗于黄骅港,且黏土含量小于黄骅港,可预计外航道的开挖(或清淤)难度较黄骅港大。     

黄骅港海域表层泥沙特性及其影响

根据黄骅港所在海域的海岸演变规律，描述黄骅海岸总的泥沙运动趋势；根据现场测量结果给出黄骅港附近海域海床表层泥沙颗粒的分布规律，从港口回淤角度指出黄骅海岸应属粉沙淤泥质海岸；根据不同气象条件下黄骅港海域现场悬沙含沙量和悬沙粒度分布的测量结果，分析黄骅港海域表层泥沙的运动特性，并指出航道的可能回淤模式和疏浚对策。     

河北黄骅港综合港区20万吨级航道工程完工

##正##本刊从河北省交通运输厅获悉,总投资37.6亿元的河北省黄骅港综合港区20万t级航道及配套工程已于2014年10月全部完工,标志着黄骅港向综合性、国际化、亿吨级大港迈出坚实一步。目前,黄骅港已形成综合、煤炭、散货、河口四大港区,共规划泊位209个,建成万吨级以上泊位25个。由沧州黄骅港矿石港务公20t     

A simplified method for evaluating singular stress field and fatigue strength of U-shaped notch

In order to simplify the assessment method of notch stress and fatigue strength for cruciform welded structures in ocean engineering, a simple stress assessment formula based on singular strength values $a{s}_i$ and $b{s}_i$ was presented according to linear elastic fracture mechanics and notch stress strength theory. In view of the stress singularity caused by the V-notch, the stress of the corresponding U-notch was recommended and used for fatigue evaluation. Therefore, on the basis of V-notch stress formula, a simplified U-notch stress field evaluation formula was obtained by theoretical analysis and numerical calculation. After a series of verification, it is found that the stress distribution and fatigue strength evaluation formula for cruciform welded joints based on singular strength values proposed in this paper can simply and accurately predict the notch stress at welded joints. The result of fatigue strength evaluated by the simplified formula has a smaller scatter band.     

Application of H∞ filtering in the initial alignment of strapdown inertial navigation system

In this paper , the principle of H∞ filtering is discussed and H∞ filter is constructed, which is used in the initial alignment of the strapdown inertial navigation systems(SINS). The error model of SINS is derived. By utilizing constructed H∞ filter, the filtering calculation to that system has been conducted. The simulation results of the misalignment angle are given under the condition of unknown noises. The results show that the process of alignment with H∞ filter is much faster and with excellent robustness.     

Strip method for a laterally drifting ship in waves

Lateral drift occurs due to the effects of wind forces, wave drifting forces, or both on ships sailing in actual seas. It is important therefore to investigate the influence of lateral drift on seakeeping performance for improved ship operation. The velocity potential was expanded as an asymptotic power series in terms of the lateral speed parameter, τ, defined as ω _e V ₀/g, where ω _e is the frequency of wave encounter; V ₀ denotes the lateral velocity, which is assumed to be sufficiently small; and g is the acceleration due to gravity. By combining this technique with the strip method, two sets of motion equations of all the hydrodynamic force coefficients for ship seakeeping were derived. The first set is for ships without lateral drift and is the same as the equations in the new strip method, and the second set is for the additional motions induced by lateral drift. It was found that all ship motion modes except surge are coupled when a ship drifts laterally in waves.