As the values of wave factors in period of reoccurrence were deduced for many significant propagating direction in the yangtse river estuary , the wave reflection - refraction modeling is employed in terms of the equations with the slowly varying topography , and the influence on the effects of the channel and shoaling is included in this model . at the same times , the effects of the bottom friction and wave breaking are also considered , but the local wind field and background flow are ignored 在推算长江口深水航道几个主要波向的重现期波浪要素值时，采用了基于缓坡方程的波浪折射?绕射模式，该模式考虑了航槽和浅滩对波浪的影响，同时也考虑了底摩擦和波浪破碎对波浪的作用，但未能考虑局地风场和流场的作用。
A number of statistical and analytical works have been done by the institutions such as thethird shipping affair engineering and relonnissanle design institue of ministry of communications , hohai university , yangize valley water hudroprower planning and institule , nanjing hydraulic research institute and so on [ 25 - 30 ] . in 1993 , the correlation analyses based on the data from the short - term situ - observation at near sea - route of the yangtse river estuary and the ship - stations were carried out to deduce the wave factors used in the engineering design 交通部第三航务工程堪察设计院、河海大学、长江流域水利规划设计院、南京水利科学研究院等单位曾作过不少统计和分析工作[ 25 - 30 ] ，在九十年代前期，人们曾根据长江口深水航道或附近短期实测资料与引水船站进行过相关分析，进而推算出设计波要素。
In view of the technical problems of softening of foundation soil and reduction of bearing capacity of the breakwater under the action of repeated wave loads during the execution of the second phase of the deepwater waterway regulation project in the changjiang estuary , tianjin port construction corporation has successfully developed safer , higher quality and highly efficient technology and special - purpose marine craft and machinery for laying deepwater sand blankets and offshore installation of prefabricated drains , which were more suitable for the working conditions in the changjiang estuary , and has also explored the construction technology for prefabrication of caissons with rubber anti - sliding plates , to ensure the efficient implementation of the engineering measures against softening of foundation soil 摘要针对长江口深水航道治理二期工程施工过程中遇到的堤身在波浪重复荷载作用下地基土出现软化、承载力降低的技术难题，第一航务工程局成功开发了适合长江口工况的安全、优质、高效的深水砂被铺设和海上塑料排水板打设施工工艺及专用船机设备，探索了一整套带橡胶阻滑板的沉箱预制施工工艺，确保了抗软化工程措施的有效实施。
This paper describes the application of semi - circular breakwater at home and abroad and the design innovation and optimization of semi - circular jetty in yangtze estuary deepwater channel regulation project , esp . the design of estuary jetty structure using semi - circular floating caissons ; a new calculation method for wave forces acting on the submerged semi - circular estuary jetty and the optimization design method for semi - circular structures are recommended 摘要介绍半圆型防波堤和河口导堤在国内外的应用概况及在长江口深水航道治理工程中对半圆型导堤的设计创新和优化半圆型浮式沉箱的导堤结构型式，提出堤顶淹没情况下半圆型导堤波浪力的计算方法以及半圆型结构的优化设计方法等。
Based on the structural features of semi - cylinder composite dike in the yangtze estuary deepwater channel regulation phase project n a section , the key technique of such semi - cylinder transportation procedure and precasting quality is analyzed and summarized , which may serve as a reference for relevant construction 摘要依据长江口深水航道治理二期工程n a标整治建筑物中半圆体混合堤结构形式，对这种半圆体大型构件出运工艺与预制质量控制的技术关键进行分析总结，供同行参考。
In period of the eighth five - year plan of china government , correlated and statistical analyses were carried out by nanjing hydraulic research institute in terms of the situ - observation data of winds and waves and historical synoptic chart in order to the dredge of the sea - route of the yangtse river estuary , and empirical relations between wave and wind velocity and between wave and wind region 进入“八五”期间，为整治长江口深水航道需要，南京水利科学研究院曾对引水船测站1960 - 1980年实测风与浪的资料进行过相关分析，结合历史天气图进行的概率统计分析，得出了波浪与风速、风区的经验关系。
By use of the morphological coefficients of estuarine riverbed and the relevant data of the north channel of the yangtze river estuary , the widening rate of the regulation line of the north deep - water channel of the yangtze river estuary is calculated , and the calculation result is in agreement with that of the fixed bed model test 利用已有的河口河床形态系数及长江口北槽的有关数据，估算了长江口北槽深水航道治导线的放宽率，且与定床物理模型试验值基本相符。
