Abstract:The Anqing reach in the lower reaches of the Yangtze River consists of three continuous branching channels including Anqing waterway,Taiziji waterway and Guichi waterway,of which the recent fluvial process is intricate.Based on survey hydrology,terrain data and mathematical model,we analyze the relevance of flow dynamics,velocity distribution,stage and the change of split ratio of three continuous branching channels,and suggest that the transition section between the branches and the stability of the key beach shoreline should be maintained in the river and waterway regulation project.The results can provide reference for similar project.

Abstract:We summarize the channel regulation engineering construction experience of the middle and lower reaches of the Yangtze River since the 1990s,gather the current situation and the general situation of constructed,under-construction and awaiting projects,evaluate the regulation effectiveness from the aspects of evolution of shoals and channels,shoreline,high beaches,branch division ratio,channel dimension,and analyze the problems of the subsequent construction.Contrasting the channel conditions before and after the implementation of the project,we find that constructed projects succeed in many aspects,such as systematically protecting river beaches and shorelines,stabilizing river regime and the situation of shoals and channels,increasing channel depth and improving channel conditions of constructed reaches.The constructions of channel projects lay foundation for future regulation.

Abstract:This paper studies the evolution mechanism of concave scour and convex sedimentation of Chibakou waterway bend downstream the Three Gorge Reservoir under the new conditions of water and silt,and adopts the methods such as prototype observed data analysis,theoretical analysis and mathematical model to analyze the bend evolution mechanism.The results show that the water and sediment conditions changed by impoundment of Three Gorge Reservoir are the main influencing factors for bend evolution,and it is also predicted that the phenomenon of concave scour and convex sedimentation is likely to develop continuously.

Abstract:Based on ANSYS/LS-DYNA,we carry out the numerical simulation analysis of underwater drilling blasting,establish the axial uncoupling and air axial uncoupled single hole drilling blasting model of water medium,and research the mechanism of rock blasting fracture.Furthermore,the superiority of the uncoupled charge structure of the water medium compared with the air uncoupled charge structure blasting is demonstrated by the numerical simulation,the energy utilization rate is greatly improved,and the optimal structural form of underwater drilling and blasting charge in the uncoupling state of the water medium is obtained.The structural form has certain reference value for the application of underwater reef engineering in waterway rectification and port terminal construction.

Abstract:There is no standard particle analysis method for plastic light model sediment at present.In order to improve the accuracy of particle size analysis of plastic light model sediment,we research the particle size analysis methods of the model sediment frequently used in the Yangtze River channel movable-bed river model test,and analyze the aspects of applicability,analysis results and influencing factors.The results show that the laser method is the most suitable for the particle size analysis.The sound wave screening method can be the alternative method but there is a certain degree of error.The conventional particle analysis methods such as standard vibrating screening method,scale method,particle size counting method and parasitic light eliminating analysis method are not applicable to the particle analysis of plastic light model sediment.It is recommended to use the results of laser analysis as high requirements or dispute arbitration data.

Abstract:The research on the wave and tide coupling simulation technology can provide a technical support for the construction of coastal disaster prevention system,disaster assessment,early warning and response.It is of great significance to prevent and reduce the storm tide and typhoon wave disaster along the sea platform.We review the research results of storm surge and wave physical model test,analyze the latest research progress and development trend of wave and tide coupling simulation,use the continuous storm tide level change process to superimpose the wave process after the encrypted and discrete wave,and through the wave making machine and the tide generating equipment,we make the continuous tide generating wave.In the water trough,the synchronous change of tidal level and wave is realized in the tank,thus the coupling simulation of wave and tide is realized in the laboratory,and it is applied to the simulation example.

Abstract:Based on the wave physical model research of sediments,we analyze scour and silt,and the stability of artificial beach for Port City Project,Colombo,Sri Lanka under two cross-sectional beaches of different slopes in the wave,different water level and return period.The results show that under the secondary wave,the beach has different degrees of erosion.The main erosion of the beach profile is generally located in the wave breaking zone below the water level,but when the wave condition increases,the erosion will extend to the area above the water level.In the experimental conditions,the higher the sea level,the higher the wave height and the period,the larger the secondary wave after the breakwater,the greater the deformation of the beach profile and the greater the erosion depth.The erosion and deposition sites of the beach profile under the secondary wave are basically similar under the two different slopes of the integrated slope and the single slope,and the section stability is equivalent.

Abstract:In view of the existence of vortex-induced vibration,poor structural stability and obvious dynamic characteristics of the high fineness ratio floating structures under water,the mechanical characteristics and dynamic characteristics of the floating structure under water are analyzed and calculated,so as to find a way to reduce the vortex-induced vibration effect of the floating structure under water.At the same time,physical model test is used to verify the accuracy of the research results.The results show that the vortex-induced vibration of underwater floating structures can be effectively reduced by using reasonable baffle structure.The theoretical analysis and simulation method can be effectively applied to the underwater floating structure optimization design.

Abstract:Combined with Holland gradient wind field and CCMP wind field,based on the third-generation wave numerical model SWAN,we carry out a numerical simulation of wind wave field under the influence of 0515 typhoon “Khanun”,and verify the simulated wind speed and significant wave height by the data of Jason-1 satellite.On this basis，we move the “Khanun” path eastward,establish eight typhoon paths including original path,and study significant wave height of each branch of the Yangtze River estuary under different typhoon paths.The results show that when typhoon paths cover whole Yangtze River estuary,significant wave height of each branch is larger,and from western or eastern side,the impact is relatively smaller.When typhoon paths near estuary entrance,wave height of northern branch and channel is larger.When typhoon paths near southern branch,wave height of southern branch and channel is larger.When the path of typhoon is crossing the Yangtze River estuary,the impact on outside entrance is larger than inside entrance.The maximum value outside the entrance is between 2 m and 3 m,and the maximum value inside is between 1 m and 2 m.

Abstract:In order to study the influence of curing age and mineral admixture on the chloride ion binding ability of mortar,we compare the accuracy and reproducibility of different chloride ion concentration detection methods,determine the automatic potentiometric titration method as the best detection method,and research water-soluble chloride ions and acid-soluble chloride ions by automatic potentiometric titration for mortar samples of different curing ages and different mineral admixtures.The results show that the content of water-soluble chloride ions in mortar decreases with age,while the content of acid-soluble chloride ions has nothing to do with the length of age.The content of active SiO2 and active Al2O3 in mineral admixture determines the ability to solidify chloride ions.In the middle and long age (180d),the solidification ability of fly ash to chloride ion is greater than that of mineral powder.

Abstract:According to the land intensive use problem of the container ports,we put forward a formula to estimate the portland area by combining the methods of simulation,estimation and statistical analysis,and verify the effectiveness of the formula by the data of some ports in China.The deviations between the calculated results and actual values are in the range from -19.63% to 24.08%,among which the deviation within 15%,10% and 5% account for 80%,71% and 43% of total samples respectively,and effectiveness of the formula is verified.Based on the discussion of formula parameters and analysis of common factors in typical port areas,we consider that the following measures should be taken for land intensive utilization in the port area,such as to raise equipment coverage,to increase water to water transfer ratio,to layout automation yard,to increase turnover speed of goods by using new generation of information technology,to arrange intensive auxiliary producing facilities,to optimize road system and to reduce road area occupation,etc.

Abstract:The significant adjustment of the national crude oil import policy and the great upgrading of the crude oil transformation system of Shandong Province will exert a great influence on the layout planning of large coastal crude oil berths.So,a study is performed on the reasonable layout of the coastal crude oil berths of Shandong Province.A new layout planning of large coastal crude oil berths is put forward by supply-demand balance analysis according to the current situation and trend of oil refining,chemical industry,and oil transformation system.It shows that the import volume of local refineries is going to increase rapidly,the pipe transformation capacity of first-route receiving ports is enhanced greatly and the current layout planning is unable to meet the requirements of new situation.The new layout pays more attention to the demand of local refineries and Dongying Port is suggested to be a first-route receiving port.

Abstract:PIANC proposed the calculation of the depth of wave richness in the harbor basin and channel from the analysis of six influencing factors including ship class,ship loading degree,water depth,wave height,wave direction and navigation speed.Aiming at the depth of wave richness at the front of the wharf,PIANC's calculation method of wave richness was introduced.In addition,the adaptability of PIANC’s calculation method for the depth of wave wealth at the wharf's front edge is analyzed in detail,and the vertical motion of ships caused by long period waves is briefly discussed.This paper focuses on the simplification of the PIANC calculation method and the comparative analysis with the Chinese code,and provides suggestions on the wave response allowance alongside jetty apron coefficient K0 after the simplification of the PIANC calculation method,providing reference for the engineering design.

Abstract:Deep-water wharves are mostly located in the ocean with complex natural conditions.Under the action of ocean wave cyclic loading,many wharves have been seriously damaged and cannot be used before they reach the designed life.On account of special damages to the overall structure of the wharf under cyclic loading of ocean waves,according to the engineering experience,ANSYS software is used to establish the integral finite element model for foundation-pile-superstructure of high-piled wharf.With damage constitutions used,we established the empirical formula of sea soil softening coefficient,simulated and analyzed the damage and damage law of wharves after different operating years.The results show that the crack starts from the panel at the earliest and gradually develops to the bottom of the beam.However,the softening of foundation soil is out of step with that of concrete.Cracks that increase after 10 years start with the bottom of the beam.Therefore,the overall impact of cyclic wave loads on the pile-upper structure of wharf should be considered in designing,and according to the synergistic action mechanism between the actual pile foundation and the superstructure,corresponding measures make the design more scientific and reliable.

Abstract:Compared to the conventional shore connected breakwater,the function of isolated breakwater is more simple and clear.Isolated breakwater is set for providing wave protection for a single jetty usually,considering the overall economic benefit on the premise of satisfying its specific function,the elevation design standard for isolated breakwater can be reduced appropriately.Based on the actual project,European standard is adopted in this paper to calculate the wave overtopping and wave transmission for isolated breakwater.Then,the isolated breakwater elevation is determined according to control requirements of wave overtopping and wave transmission,and design elevation of the isolated breakwater is verified by the physical model test.

Abstract:A physical model test is carried out to study the stability of a new type of seawall called grouting and masonry armor.The development process of the instability of the grouting and masonry armor is studied under wave action.Research shows that the stability of the grouting and masonry armor decreases with the increase of the breaking wave parameters and increases with the increase of the opening rate.Similarly,the setting of the suppression layer is conducive to increasing the stability of the grouting and masonry armor.Based on the previous research results,the formulas for calculating the stability thickness of the grouting and masonry armor with different opening rates were given.

Abstract:For the projects in China,the vibration standard of replacing sand bedding is standard penetration test blow count N≥15.However,the above standard is lack of theory calculation.In order to solve this problem,we analyze and research French norms and other relevant documents,carry out a method of calculating the vibration standard of replacing sand bedding following the French norms.Based on a foreign project,the calculation results show that the suitable SPT N of replacing sand bedding for large-scale gravity wharf is not less than 22.The relationship between SPT N and angle of shearing resistance or limited pressure is the core of calculation.As the trend of larger-sized vessel and appearance of new equipment and new technique for large-scale gravity wharf,increasing the vibration standard of sand bedding appropriately is beneficial to improve the bearing capacity and control the settlement.

Abstract:Construction of sea dikes in coastal cities is often affected by adjacent bridges and tunnels,construction conditions are subject to various constraints.Therefore,this paper presents a low-pile wide-platform unloading-board seadike which is suitable for the disadvantageous conditions,such as small-size pile driving equipment,limited operation and construction area,bad geological conditions,no replacement of filler,heavy load to ground,high requirements of anticorrosion,etc.Three dimensional numerical simulation is carried out through MIDAS/GTS NX software,and deformation data are collected by field monitoring.The results show that the proposed structure plan has the advantages of small bending moment of pile foundation,small horizontal shift,good whole stability,etc.

Abstract:The finite element software ANSYS is used to construct a model of large vertical ship lift,which includes tower column,ship chamber,water,ship,lifting system and so on.The dynamic characteristics of the ship lift structure are calculated and analyzed.The results show that the lateral swing,the torsion and the longitudinal swing are the main vibration modes of the ship chamber.A ship in the ship chamber will reduce the natural frequency of the system.The frequencies of the lateral swing under the condition with and without ship are 0.130 9 Hz and 0.280 5 Hz respectively.The low-order vibration mode of the whole structure of ship lifter mainly includes the transverse vibration of the whole system,the vertical torsion of the whole system and the longitudinal vibration.Whether there are ships in the chamber,the difference in natural frequency calculated of the whole system is small which shows that ship has little influence on it.The natural frequency value of the ship lift is decreasing with the increase of the position of the ship chamber.The position change has a great influence on the low-order vibration modes of the ship lift and has little influence on the high-order vibration modes.

Abstract:Transportation mode conversion is a very important way for regional energy saving and emission reduction.To quantitatively evaluate the effect of this conversion,this paper focuses on inland navigation channel capacity improvement,and uses Logit model to determine the share rate of inland navigation transferred from railway and road.Based on energy consumption and emission related parameters,the required energy consumption and CO2 emissions before and after the transformation of transport mode are determined respectively,and the contribution of capacity improvement of inland waterway to regional energy conservation and emission reduction is compared and analyzed.Taking the recovery of shipping of Xiaoqing River in Shandong province as an example,the calculation model is adopted for analysis.The results show that the energy saving and CO2 emission reduction of this project are up to 32.10%,indicating that the capacity improvement of inland waterway has a significant effect on energy saving and emission reduction of regional transportation system.

Abstract:The navigable flow condition in the upstream approach channel of the second-line shiplock of Mengzhouba hydro-junction is studied by means of overall fixed-bed model experiment and ship model navigation test.According to the results,the transverse velocity at the anchor segment and the entrance area exceeds the standard under the engineering arrangement of the original design scheme,which does not meet the specification requirements of the navigation flow condition.By extending the length of the diversion wall and setting permeable partition at the bottom of the wall，the engineering arrangement is optimized and a recommended scheme is proposed.Under the recommended scheme,the navigable flow condition at the entrance area is improved significantly,and the ship maneuvering parameters are controlled within limits of requirements.It indicates that the ships can pass through the entrance area safely.

Abstract:In view of the characteristics of Yakou hydro-junction in Hanjiang River,we propose the centralized layout scheme with shiplock and hydro-power station at the same bank，and the other scheme at different banks.In order to search for the best engineering program，we focus on the analysis mainly from the aspects of construction organization，navigation condition，discharge capacity and engineering investment,and demonstrate that the scheme with shiplock and hydro-power station at the same bank has obvious advantages in comparison with the other scheme in aspects such as the economic investment，convenient construction,etc.As a result,the more reasonable general layout scheme is determined.

Abstract:With development of water transport sector,the abrasion of fixed bottom pivots on traditional miter gates is exposed gradually.Therefore,the layout and design are of great importance to fixed bottom pivots.By analyzing the limitations of the traditional fixed bottom hinges of miter gate,the design is advised to improve from three aspects:structural improvement,lubrication system and selection of friction pair material.Compared with the traditional fixed bottom hinges,the improved structure is convenient for replacement during maintenance,prolongs service life and improves structural reliability.It is worthy of promotion and application on the lock project.

Abstract:Guniusha waterway is one of the key navigable waterways in the middle reaches of the Yangtze River.It is of great significance to control the channel well for the smooth passage of the middle reaches of the Yangtze River.Combining with the recent evolutional characteristics of Guniusha waterway in the middle reaches of the Yangtze River,and aiming at the revetment reinforcement layout scheme in the initial design report of Guniusha waterway second phase channel regulation project,we present the optimization plan,and carry out the special design analysis and the checking calculation of the structural stability.The results indicate that the reinforcement length of the bank protection engineering can be reduced by 200 m,and the riprap amount in reinforcement engineering can also be reduced to 73,000 m3.The smooth bank slope meets the stability requirement of the whole design.It can provide a technical support for the second stage waterway regulation project and guarantee of safe navigation,and may serve as reference for the design of similar projects as well.

Abstract:To solve the problem that there is no criterion for the detection and assessment of lock gate at present,we research the workflow,the items and methods of detection and assessment,and the rating of technology.By summarizing relevant engineering experience and referring to relevant specifications for sluice gate,we obtain a relatively complete system for dectecting and evaluating of ship lock gate,and the the practicability of the technique is verfied by an actual project.The research achievement can provide reference for related work.

Abstract:In view of the problems of current water transport engineering such as high complexity,relating to many specialties and low degree of standardization,we present a fusion application of VR(Virtual Reality),simulation and BIM(Building Information Modeling)in water transport engineering design,which provides an efficient tool of design and management with friendly interface of VR,scientific management and control of simulation,complete and accurate data environment of BIM,coordination among specialties,and visualization of information model.

Abstract:In order to solve the technology defects in current dike’s BIM 3D wireframe-modelling method,the dike’s BIM modelling and information framework is proposed based on the characteristics of dike and its modelling needs.It consists of code standard module,naming system,section extraction module and 3D solid modelling module.With the help of such framework,the geometry and corresponding information can be ironed into the same solid BIM model.Autodesk and its subsidiary Civil 3D/Revit are utilized to implement the above framework,while it can also survive in different BIM software platforms.The application results show it can construct the BIM model automatically,which enhances work efficiency profoundly.Moreover,it has a reference significance for the dike’s life-cycle BIM application.

Abstract:The settlement calculation of soft foundation under seawall reinforced by semi-rigid piles is mainly based on the composite foundation calculation method.In order to compare the difference between the calculation results of the composite index calculation method and the solid pile method,combined with an engineering example of a sloping seawall,taking the geotechnical finite element software PLAXIS 3D as the analysis platform,we respectively used solid piles and composite indexes to establish the spatial elastoplastic finite element model for the stability analysis of cement mixing piles on the sea embankment soft foundation.The results show that the solid pile model can simulate the soil arch effect,settlement difference between pile and soil in the plane of pile head,and the constraint effect of cement mixing pile on soil between piles,and reflect the displacement and stress distribution of soft soil foundation more truly.The analysis results provide reference for similar engineering and numerical simulation calculation of soft foundation reinforced by semi-rigid piles.

Abstract:The rapid reinforcement technology of super-soft fill soil in the port area is a technical treatment method for the rapid reinforcement of the super-soft fill soil in the reclamation project.The technique can be applied in a short time without destabilizing the foundation.Compared with traditional vacuum preloading method,it has great engineering advantages.Combined with the engineering example of soft foundation treatment project in Quanwan port area,we preliminarily determine the design parameters according to the experience,and predict the bearing capacity of foundation.By further optimizing the design parameters,we compare and analyze the effect of soft foundation reinforcement under three kinds of drainage plate spacing.The optimal design parameters are determined by combining engineering cost,reinforcement effect and design safety reserve.

Abstract:To study the mechanism and failure mode of the joint force of steel casing and reinforced concrete（RCFST）,this paper takes the phase II pile foundation engineering of Chongqing Orchard Port as the prototype to carry out the research on the cooperative force mechanism of steel structure and reinforced concrete structure and its design optimization technology.The axial pressure of the short column of RCFST structure is carried out with the thickness of the steel tube,the ratio of reinforcement and the ratio of the stirrup.According to the test results of different parameters,the failure mode and stress mechanism of RCFST structure are analyzed.The test results show that the steel retaining tube and the reinforced concrete short column structure have the restraining effect on the core concrete,and the double restraining effect is obvious.The restraining effect of the steel retaining tube and the stirrup on the core concrete can effectively restrain the concrete crack development and make the steel retaining tube more traditional steel tube concrete structure.It has higher bearing capacity and better plasticity & toughness.When the steel retaining tube has sufficient restraining effect,the steel tube,concrete and longitudinal reinforcement can be yielded when the specimen is destroyed,and the material properties are fully utilized.

Abstract:Based on a case of offshore artificial island engineering,we establish a spatial elastoplastic finite element model for the stability analysis of the cellular steel sheet pile structure by employing PLAXIS 3D finite element software to study the deformation and stability properties on soft foundation and analyze the influence of the composite foundation on the stability the quay wall structure.Results show that reinforcement of the soil inside and outside of the cellular sheet pile improves the structural stability to different degrees.Especially,when the jet grouting piles is constructed inside the offshore artificial island,the stability of the quay wall structure increases greatly and the maximum post-load settlement of the artificial island could be effectively controlled.The research may serve as reference for the design and application of this structure on soft foundation.

Abstract:In order to better control the quality of the Kuwaiti LNGI engineering dredger fill sandy soil foundation,and rationally evaluate the bearing capacity of the hydraulic blown sand soil foundation after treatment,three empirical formulas based on CPT are selected,and the qc value of the minimum cone tip resistance required under the action of 200 kPa of designed bearing capacity is calculated.The results showed that the minimum qc values calculated by the Bowles(1996)method and BS EN 1997-1:04 Annex D recommendation method are related to the hydraulic filling quality grade,but the results are close,while the results calculated by Eslaamizaad & Robertson(1996) method are smaller,only 3.8 MPa.Based on conservative consideration,the final result takes the maximum of 7.5 MPa in the average value of the previous two methods.At the same time,CPT test is carried out in advance after foundation treatment,and the average cone tip resistance is much higher than the calculated acceptance value.It can be seen that after the foundation treatment,the foundation treatment bearing capacity can be evaluated by CPT in advance and verified by a small number of large ZLT tests,so that the foundation bearing capacity can be checked effectively.

Abstract:Vacuum preloading is an effective consolidation method to treat thick soft clay.In order to measure the increase of consolidation and the deformation change during the ground improvement,the consolidation process should be monitored.The pore water pressure is an important parameter to indicate the dissipation of excess pore water pressure.Piezometer can be divided into two types,open and sealed respectively.The measuring principles of open and sealed piezometers are analyzed,the performance of vibrating wire piezometer in vacuum preloading is checked by field trial tests,and the methods to improve the long term robustness and accuracy of vibrating wire piezometer are proposed,including adopting filter stone with high air enter value and Ridley-type flushable piezometer.

Abstract:The three-dimensional nonlinear finite element numerical model of super-long pile and soil is established.The loading characteristics of super-long pile after preloading of soft soil foundation are studied by preloading drainage consolidation method,and the changes of soil consolidation settlement,side friction resistance of pile body,pile top displacement load curve and axial force of pile body are analyzed.The preloading time,preloading load and preloading effect of different soil are analyzed by the control variable method,the sensitivity of the single pile and the group pile to the preloading are compared and the influence of consolidation degree on the bearing behavior of super-long piles is analyzed.The results show that preloading can improve the foundation and the bearing capacity of super-long pile groups.The consolidation settlement of soil and the side friction resistance of the pile body can be increased by increasing preloading.Increasing the preloading time can increase the side friction resistance of the pile,reduce the settlement of pile top and the axial force of the pile.The effect of preloading on the pile group is better than on the single pile.The better the consolidation degree is,the better the bearing performance of the super-long pile groups.For the silty clay,clay and muddy silty clay,the consolidation of the foundation is basically completed when the preloading time reaches about 90 days and 180 days respectively,and the preloading no longer changes the mechanical index of the soil.

Abstract:The current pile foundation specification lacks the specification of the pile foundation parameters of very dense fine sand layers.This paper discusses the pile side of large-diameter steel-pipe piles in very dense fine sand layers in combination with the static load and high-strain testing of a steel pipe pile foundation in a harbor project.According to the results of high-strain testing,we know that the pile shaft-resistance range per unit area of the fine sand layer of this project is 93~120.01 kPa,and the average value is 106.6 kPa,and the tip-resistance range of 1 500 mm steel-pipe piles is 6.742~6.845 MN,and the average is 6.780 MN.After analyzing the calculation results of the bearing capacity of the pile foundation,it is recommended that the pile shaft-resistance value of the extremely dense fine sand layer takes 90~120 kPa,and the tip-resistance value of the pile takes 8~12 MPa.

Abstract:In the reclamation and land reclamation project,underwater sanding is required to be completed by blow-filling.In the past,construction techniques used during underwater sanding were likely to cause water pollution.At the same time,sand concentration and sand particle size distribution in the sand fill area were very uneven.This paper introduces an environment-friendly underwater closed diffusion sanding device,which is designed according to the principle of hydrodynamics,adopts a closed diffusion-type structure with internal baffles to achieve large-area,high-efficiency,as well as environment-friendly sanding operations.The underwater closed diffusion type hydraulic sanding device consists of an inlet section,a diffusion section and an inner baffle plate.The computational fluid dynamics(CFD)method is used to simulate the internal flow of the sanding device with clear water as the medium,and the influence of different baffle plates on the flow characteristics and sanding uniformity of the sanding device is analyzed.The final designed underwater sanding device has the advantages of environment-friendliness during construction,simple structure,large single-sand sanding area,high sand-laying efficiency,uniform sand distribution,etc.

Abstract:Regarding to the silty material accumulated in hydraulic filling normally,which can not satisfy the requirements for ground improvement,and on the basis of dredging and reclamation project in Kuwait,this article introduces the method of adjusting the silty material’s scope and thickness for sillty removal using dredging equipment synchronously,which is advantageous in high efficiency and timeliness for continuous dredging and filling works.

Abstract:The efficiency and safety of the underwater concrete cube installation in the breakwater project is critical,and the traditional installation methods and detection methods are seriously inadequate.The 3D real-time sonar imaging system has effectively overcome the disadvantages of the traditional methods,and has the advantages of real-time,efficiency,clarity and personnel safety.And it can work under complicated conditions such as low visibility and poor sea condition.In this paper,based on Israeli port of ashdod Ashdod port breakwater engineering project,the techniques and control measures taken for installing concrete cube for 3D sonar imaging system are introduced and summarized,which serves as a reference for the construction of similar projects.