Abstract:The features of large scale waterway regulation projects include long construction river sections,huge construction quantities,and excessive construction procedures.The construction water area has large navigable density and many kinds of ships.Safety control of construction and ship navigation is challenging due to dense traffic flow and various ship types.Based on the typical large scale waterway regulation projects located respectively at lower,middle,and upper reaches of the Yangtze River,aiming at the techniques of risk control and safety guarantee throughout the construction process,we apply the combined research methods of theoretical analysis,numerical simulation,field testing,and system development to improve risk identification and assessment accuracy,establish risk prediction model of navigation and production safety,study techniques of safety guarantee and control considering all aspects,processes,as well as factors,and develop integrated safety information platform of construction area.The results can provide a theoretical and technical guideline for ensuring safety control of construction and ship navigation in large scale waterway regulation projects.

Abstract:In second section of the first phase of the construction of the 12.5 m deep water channel construction project in the Yangtze River below Nanjing,there is a wide range of soft mattress laying in transition between the high beach and deep water.Aiming at the problem of how to realize the one-time laying of the steep slope section of the shoal,we study and discuss the ship selection and construction method,and apply the construction technology of soft mattress by abutting joint laying for soft shoal and steep slope.The technology achieves the one-time laying of the high shoal and the deep water transition section,avoids the possible quality problems which may lead to the split amplitude lap joint.It can effectively guarantee the quality of the construction,and can provide reference for the similar projects.

Abstract:In waterway regulation and beach protection projects,penetrating frame groups are usually completed by one-time construction.This construction method could not fully exploit the advantage of the height of penetrating frame groups,resulting in the unsatisfactory accumulation height of frame groups.It is proposed to use the topography after siltation of 1~2 permeable frame groups in advance,and then implement 1~2 permeable frame groups,that is,the construction method of permeable frame group is implemented by multi-layer and multi-time construction.The generalized flume test showed that this method could fully exploit the deposition topography after the early implementation and reach the ideal height of accumulation,so as to effectively improve the silting effect of the penetrating frame groups.

Abstract:In order to research and develop ecological structure and provide technical support for the construction of ecological channel,based on the investigation and analysis of aquatic organisms,the structure form of penetrating frame dam is proposed.Based on the results of the flume experiment,the difference between the penetrating frame dam and the solid dam is analyzed,and the ecological effect of the penetrating frame dam is analyzed from the aspects of fish-collecting effect and improving the habitat suitability of fish.The main conclusions are as follows:1)According to the flow field distribution,there is a return current zone behind the dam for solid dam within a certain range,there is no return current zone behind a penetrating frame dam;2)Penetrating frame dams are proved weaker (the depth of scour hole of penetrating frame dams is 60% that of the solid dams) and last longer;3)Penetrating frame dams can play the role of artificial fish reef,the internal gap of frame dam provides habitat for fish and other aquatic creatures,and has a strong attraction effect on fish;4)Penetrating frame dams improves the habitat suitability of the fish by increasing the oxygen content in the water and the area of the velocity zone.

Abstract:The waterway project has the characteristics of long construction period and many affecting factors.In the various stages of design,construction and maintenance of waterway engineering,with the increasing demand for refined management,the traditional implementation methods cannot meet the strength and precision requirements of the project.This paper starts with the characteristics of waterway engineering and BIM,and discusses the application of BIM technology in the design,construction and maintenance of waterway engineering.On the premise of ensuring the rationality of the design,the expression and transmission of the design intention can be completed through the BIM model,so as to guarantee the construction quality of the waterway engineering and to play its role in the security and stability of the waterway regulation buildings in the subsequent maintenance stage.

Abstract:Aiming at the economic benefits of various schemes for the channel deepening project in the south passage of the Yangtze estuary，we adopt a double clock mechanism to optimize the model of ship pre-queuing model to establish a marine traffic simulation system.Based on some factors including characteristics of channel,ship sailing,ship dimension,tide and navigation regulations,we solve the queuing problem in the channel by the simulation comparison,and obtain parameters for the evaluation and estimation of economic effects of the South Passage channel deepening project,such as queuing time and utilization ratio.Consequently,it can offer reasonable suggestions for scheme choosing for the channel deepening project.

Abstract:In view of the recent problems in the upper shallow area of Zhangjiazhou waterway,a two-dimensional water and sand mathematical model is established based on the newly measured topography of Zhangjiazhou waterway.Using this model,the simulation analysis of water flow and channel conditions of the 6 m depth waterway regulation project is carried out.The results show that after the implementation of the project,the channel reaches the goal of achieving stable beach developments and protecting the channel and increasing the width of the navigation channel in the shallow area of Nangang,and can meet the target channel scale of 6 m×200 m.

Abstract:In order to enable engineers to better understand and use the 2018 standard system for harbor and waterway engineering，this paper summarizes the development course and the features of previous edition of standard system,and introduces the background,principles,main contents and characteristics of the 2018 standard system for harbor and waterway engineering.The main structure is kept basically coincide with the former version,the safety,energy conservation,environmental protection,engineering information standards and some standard translation projects in foreign languages are added in this standard system.This further highlights the basic,strategic and guiding nature,which is of great significance for deepening the structural reform of the supply side of the waterway industry and serving the belt and road recommendation.

Abstract:The wave breaking positions of the island reefs were tested by a series of wave flume model tests.In the experiment,the reef topography was generalized to the model connecting the steep slope to the horizontal platform.The locations of the wave breaking under 3 kinds of steep slopes (11.5,13 and 15) and 3 relative water depths (0.1,0.17 and 0.24) were studied.The results show that the relative position of wave breaking is related to the number of Irribarren,the relative water depth of the reef flat and the fore-reef slope.The breaking position moves toward the shore with the increasing of Irribarren number and relative water depth,but toward the sea side with the steepness of the slope.Finally,the calculation method of wave breaking position was also given in this paper.

Abstract:The mean longshore current distribution has a significant impact on coastal discharge and sediment transport.In order to study the distribution characteristics of mean longshore current more deeply,especially under steep slopes rather than mild slopes,base on the 140 steeper-slope mean longshore current experiment,this paper searches for the curve fitting of mean longshore current distribution,which is different from Allen distribution and suitable for steep slopes.The results show that using the self-defined piecewise function and the appropriate constraints can better fit the distribution characteristics that the coastal side of the mean longshore current distribution shows a convex trend under steep slopes.

Abstract:Based on the observed data of hydrological sediment and the depth of terrain for many years in Oufei shoal,this paper analyzes the characteristics of the hydrodynamic sediment and the evolution of terrain erosion and deposition.The results show that the current in the study area are non-formal half-day shallow-sea tides,and K of the sub-stream ellipticity of each vertical line is between 0.00 and 0.20.Therefore,the current is dominated by reciprocating currents,and the distribution of sediments shows a gradual increase in the outer seaward direction.The sediment concentration in the tidal period is significantly greater than that in the mid-tide and the tidal waves.Through calculations of the scouring and siltation of Oufei shoal in recent decades and related cross-sectional analysis,it is known that the tidal flats in Oufei shoal are generally at a slightly high silt height.Unlike the tidal flat area,the underwater shoal area of Oufei shoal was from 1987 to 2010,and the average annual erosion rate was 0.008 to 0.02 m,showing a state of stable and slightly scouring.

Abstract:Based on the wave and meteorological data near Chaohu Lake area,we apply the wave mathematical model to research wind wave characteristics of Chaohu Lake,which is verified by the field observation data and considered the influence of wind energy input and bottom friction of nonlinear parabolic mild-slope equation.The mathematical model can better predict the distribution of wave field and wave height in Chaohu Lake.Combined with the topography and layout of the lake area,we carry out the omnidirectional wave numerical simulation,and obtain the distribution of the wave field in the lake area,which provides a reference for the related engineering design.

Abstract:This paper studies the mechanism of microbeads on the CRTS III self-compacting concrete using test methods including the concrete expansion,slump,T500,cement paste viscosity,etc.The results show that the proper amount of microbeads can significantly improve the workability of concrete.When the content of microbeads is 1.5%,the workability of concrete is the best,T500 decreases from 14 s to 5 s,and BJ decreases from 30 mm to 17 mm.The results of cement paste viscosity test and concrete workability test show that the action mechanism of microbeads is to reduce the value of the expansion time T500 by reducing the viscosity of concrete.However,microbeads can improve the yield stress of concrete,which is not conducive to the increase of concrete expansion.The research result has theoretically guiding significance for the preparation and material selection of CRTS III self-compacting concrete.

Abstract:According to the two kinds of tension plate joint proposed for the frame drum wharf structure,through the axial tensile tests of concrete,we analyzed the ultimate tensile bearing capacity and failure mode of the I-steel joint with different flange width,the steel plate+steel bar joint with different total area and different diameters of the steel bar.The test results show that the ultimate tensile bearing capacity of I-steel joint is less than the whole section of concrete’s;the ultimate tensile bearing capacity of steel plate+steel bar joint is equal to the whole section of concrete’s when the ultimate tensile load the whole steel bar provide is greater than the ultimate tensile bearing load of the whole section of concrete;the ultimate tensile bearing capacity of steel plate+steel bar joint is higher than the I-steel joint’s,the frame drum wharf structure should adopt steel plate+steel bar joint.

Abstract:Aiming at the toe rock stability of rubble mound breakwaters in deep water,we apply 2D physical models to research the problem.The results show that there are some differences between deep water situations and depth limited situations in the change rules of toe rock stability with relative water depth ht/h and damage number Nod.Based on the test results,we perform an in-deep analysis of factors that may affect the toe rock stability,and modify the Van der Meer formula.The revised Van der Meer formula is in good agreement with the test results,which can be used as reference for the design of rubble mound breakwater in deep water.

Abstract:Ice flow produced in the seasonal frozen river in spring will seriously threaten the safety of embankment buildings.It is necessary to carry out research on the influential laws of the drift ice on structures.Taking the bank of Shengli dike in the Songhua River,Tangyuan County as an example,we establish a numerical analysis model of bank protection structure under the action of ice load based on the structural geological terrain using ANSYS/LS-DYNA to carry out a finite-element analysis of the bank protection structure under the ice row’s impact and clarify the variation rules of structural bearing force,so as to provide theoretical reference and technical support for the design and post-maintenance of the bank protection structure in seasonal frozen areas.

Abstract:As the foundation of the breakwater beacon,it is usually located at the part of jetty project,where the natural condition is abominable.The beacon foundation has double characteristics of wave wall and independent pile,so the wave force calculation for beacon foundation is quite complicated.Based on the practical engineering,we adopt different specifications and handbooks at home and abroad in the analysis of wave force calculation method for breakwater beacon foundation.Combining with model test result,we propose a recommended wave force calculation method for breakwater beacon foundation under the action of medium-long period wave.To ensure the stability of breakwater beacon foundation and also keep some surplus,we suggest that Morison equation should be adopted for wave force calculation,and Martin equation should be adopted for rechecking the calculation results.The analysis results in this paper can provide a certain references for the similar jetty projects and also for the domestic code revising.

Abstract:In view that the existing north breakwater occupies coastline in the south of No.3 jetty of Zhifu Port area in Yantai Harbor,three reconstruction project schemes are proposed,and the numerical simulation method is used to calculate the wave height of the inner test point in the harbor basin.The results show that,after dismantling the existing breakwater,even if the No.3 jetty was completed,the wave height of the ENE and E to the incident waves and the port front of the whole port was obviously increased because of the lack of the shield of the original north breakwater.The newly-built breakwater has a better shielding effect on the waters of the port,and the distribution of the wave height in the inner test point of the port is generally better than the present situation,among them the scheme of jetty breakwater is more superior.

Abstract:The hydrodynamic conditions of the dam group flooded by the tidal estuaries are complex and changeable,and the complicated flow structure of the spur dikes field determines the siltation process and the form of siltation in the field.Taking the field formed by the spur dikes at the north passage of the Yangtze estuary for example,we analyze the deposition pattern,rate characteristic and regularity of the dam field after the dam formation.The result reveals that with the passage of time,the dam within 2 m isobath gradually closes to 0.2 times the distance from the dam head dam strengths,and 5 m isobath gradually closes to the dam at the head of the dam;there appears a logarithmic relationship between the initial volume of the dam field and balance volume at the scour sedimentation equilibrium;when the groin spacing is 3 to 4 times the length of dam,dam deposition distributes in equilibrium;the inflection point appears 5-6 years after the dam formation.Moreover,the causes of the siltation characteristics in the dike field are discussed in terms of the layout parameters affecting the silt dam.

Abstract:In the process of implementing the regulations on site selection for underwater crossing buildings in clause 5.3.1 of Navigation Standard of Inland Waterway,we find the regulation that underwater tunnel must be laid away from anchorage is not always scientific and reasonable,due to vertical depth of the tunnel is not taken into account.Based on surveys,statistics,and analysis of anchor penetration depth and tunnel buried depth,we hold that installation and operation of the anchorage do not affect the safety of the tunnel structure,if the thickness of the cover at the top of the tunnel is greater than anchor penetration.Therefore,it is very necessary to amend the regulations that underwater tunnel must be laid away from anchorage in related navigation standards.

Abstract:This paper studies the muddy seabed liquefaction mass erosion and the transportation of concentrated benthic suspension layer caused by wave and seabed corresponding effect.We apply de Wit liquefaction conditions and calculation method,combine the method with local characteristics of wave effect and sediment transport in the Lianyungang coast,and calculate the liquefied depth of the muddy seabed under different wave condition.We also calculate the velocity of liquefied layers further considering the reduction effect on velocity induced by suspended sediment concentration.The results show that the muddy seabed may have substantial liquefaction depth under wind-wave condition,however the depth of movable liquefaction layer is not obvious.Because of the high suspended sediment concentration,large sediment transport can still be formed in the wave-induced liquefaction layer and the channel sudden siltation with a certain scale in high windy day can occur.The results can provide new ideas for seabed stability analysis and sediment transport calculation.

Abstract:The side orifice longitudinal culvert filling and emptying system is mainly applicable to the middle and low water head.It has the characteristics of simple structure,high efficiency and low cost.Nowadays,fruitful achievements have been made.Whereas,there are some difficult problems to study.Based on the large amount of research achievements at home and abroad,the studies on hydraulics are expatiated by layout of the filling and emptying systems,dissipation facilities,in-chamber ship’s mooring forces.Then,some disadvantages are discussed in this paper.Moreover,a new research topic is proposed,combined with jet theory and side orifice flow.It is the studies on the flow structure of the lateral wall jet whose direction is face to face.What is more,hoping to provide reference for further research in this field,the direction,methods and contents in the next stage to be researched have been detailed.

Abstract:The second-lane ship lock project of Xijin hydro-junction is one of the most important measures to build the “Xijiang River 100 million-ton golden waterways”.To study the influence of the inflow of the Xizhukeng River’s tributaries at the right bank of the berthing section of the second-lane ship lock’s lower approach channel on the navigation flow condition,we carry out a hydraulic model test to study the effect of energy-dissipating facilities in the tributary channel on the flow velocity and flow pattern at the inlet of the branch,and propose the engineering measures including a diagonal guide dam,baffle pier,and stilling basin,to serve as reference for similar engineering projects.

Abstract:The Fengnan 100，000 DWT channel of Tangshan Port is based on the expansion of a 20，000 DWT channel.The channel flow condition is complicated,and navigation condition is bad,so the design of the channel is very difficult.Based on the analysis of the tide duration and selection of tide level,we determine the main scale of the navigation channel and propose a reasonable channel layout scheme,which is further optimized in combination with the real ship test.Based on the numerical simulation test of current,we determine the window period of navigation.After the demonstration,it is recommended that the layout type of plan No.1 should be adopted.When a 100，000 DWT ship rides through the entrance by tide,it is the time of still tide,the flow speed is small,and the flow is stable,which is the best navigation opportunity and is conducive to the safe navigation of ships.When a large ship is influenced by the cross flow or the flow state of the entrance is complex through the port,the synchronous relationship between the high tide level and the large cross flow should be taken into consideration.

Abstract:The high head ship lock often uses the second type of filling and emptying system to meet the water flow conditions in the lock chamber,but the engineering volume is large and the construction is complicated.Based on the topographic and geologic conditions of the lock site,we can heighten the sluice bottom’s elevation to cut down the engineering volume and simplify the construction.After taking energy-dissipating measures,we adopt the long-culvert and side-port filling and emptying system.By means of physical model,filling and emptying system of Panghai navigation and electricity junction can be optimized.Meanwhile,it is confirmed that taking measures including deepening the initial inundation depth of the lock chamber,arranging the energy-dissipating sills before the outlets of both sides of the lock chamber,optimizing the arrangement of the inlet and outlet,and arranging the lock head wall at the inlet can achieve the prospective effect.

Abstract:The fine sediment in the channel often forms the turbidity maximum zone,which moves back and forth under the two-way action of the runoff and the tidal current，and develops into fluid mud at the bottom of the channel.The movement laws of flow and sediment are extremely complicated.In recent years,human activities in the estuary become more frequent.In particular,the estuary reclamation has caused big changes in the hydrodynamic and boundary conditions of the estuary.Moreover,the construction of upstream reservoir has reduced the runoff and peak discharge,in combination with the jacking function of tidal water,resulting in siltation in the channel and turbid river water.Taking the Jiao (Ling) River as an example,this paper analyzes the characteristics of flow and sediment in mountainous river with strong tide based on the measured data and considering the effect of sediment transport characteristics of viscous fine grain and salinity,develops the mathematic model of the maximum turbid zone movement in the mountainous river,and simulates the transport characteristics of the turbidity zone in the Jiao (Ling) River.

Abstract:The overall torsion stiffness of the miter gate structure of a large ship lock is very small.Under the action of self-weight,wind pressure and water pressure,the gate is prone to cause excessive distortion during operation.In order to improve the torsional rigidity of miter gate and reduce the deformation of miter gate during operation,the prestress is usually applied to the back-tie rods of miter gate in the design.In this paper,the problem of prestressing force applied to the back-tie rods of the miter gate is analyzed and studied by using the Ansys finite element analysis software,combining the shiplock of the Yakou hydro-junction in Hanjiang River.The analysis results provide reference for the application of the prestress applied to the back-tie rods,and provide reference for the design and calculation of the prestress applied to the back-tie rods of the similar project.

Abstract:In view of the rapid increase of siltation in navigation channel in Nantong waterway,we analyze the intrinsic and external factors of siltation by the combination of measured data and mathematical model.The results show that,the dynamic is dispersed and weakened as the width of Nantong waterway widening from 2 km to 6 km,then sediment deposite and shoal underwater is formed,and the shoal underwater is transported crossing the navigation channel under the influence of circulation flow.The Hutong Yangtze River Bridge and the Tongzhou shoal west channel regulation are the direct causes of the rapid increase of siltation in navigation channel.The abundant sediment scour from Fujiang shoal waterway provides part source of siltation in navigation channel.

Abstract:The construction of Xingan hydraulic project hinders the tracing channel of migratory fish in the junction area,and changes the hydrological regime of the original river.In order to restore the migratory passages of fish and guarantee the water ecological environment of the Ganjiang River basin,we plan a near-nature fishway,carry out adequate design and analysis in many ways，such as basic data,the main fish,fish way type,structure size,and establish a physical model test to further optimize and improve the flow conditions.The results show that the fishway designed can meet the upward demand of target fish under the designed water level combination condition,and the flow condition is well.The relevant research results can provide an effective reference for the construction of fishway in other water control projects.

Abstract:Aiming at the problem of whether ADCP can measure the measuring suspended sediment concentration in the Yangtze River area,this paper applies the methods of ACDP and six-points water samples collecting to test the waters in the Yangtze River estuary.Through the measurement of spring,middle and neap tide,this paper obtains the data of two measurements in the full ebb and flow cycle.The data comparison shows that it is feasible that suspended sediment concentration is measured by ADCP.There is a linear relation between the changes of logarithm of ADCP’s intensity and suspended sediment concentration.The source of the measurement error with ADCP is underwater noise,underwater bubble and variousness of water.

Abstract:Based on the data from 1951 to 2015 of water and sediment prototype of Lutaizi station of Huaihe River main stream,we apply the tools including SPSS and Matlab,methods including correlation analysis,cumulative anomaly,M-K and R/S analysis to study the the characteristics and change trend of water and sediment in the Liutaizi river section.The results show that,on the premise of no increasing or decreasing of the flow rate,the sediment transport and sediment content are obviously reduced,and the sediment content is basically stable in 0.1 kg/m3 after the year of 2000,and the change of sand sediment has a distinct stage characteristic.The change of sediment transport volume begins in the year of 1984,the sediment content mutation and the beginning of the year.From 1980 to 1986 years,the sediment discharge and the sediment concentration show an increasing trend .The river bed is mainly scoured and undercut.

Abstract:Jiepai reach lies in the middle of the Yangtze River.Its riverbed evolution is complicated and the beach has changed dramatically.Based on the summarization of the river’s evolution law,we carry out the waterway regulation works.Combining with the existing projects,we analyze the regulation effect.The analyzing result reveals that the regulation projects have inhibited the adverse changes of the channel conditions,the low beach at the transition section is basically stable,and the transition position is controlled.It lays a good foundation for the follow-up treatment of the reaches,and obtains experience for the long and straight river regulation.

Abstract:ABAQUS finite element software is used to simulate the vertical bearing condition and construction process of rock-socketed pile (quadrangular pile) on the slope.The nonlinear effects of material and pile-rock contact are taken into account when three-dimensional models of the slope rock-socketed group piles system are established.Based on the change for parameters of slope angle,socketed depth etc.,the vertical bearing capacity of slope rock-socketed group piles is analyzed.Research results show that under different conditions of slope angle and socketed depth,vertical bearing capacity of slope rock-socketed group piles is the comprehensive reflection of radial expansion of group piles,loss effect of rock mass before pile,enhancement effect of rock mass behind pile,and platform stiffness etc.The pile group effect coefficient of group pile increases gradually with the increase of slope angle (0°≤R≤45°).When the slope angle is larger (30°≤R≤45°),the uneven settlement of platform and each pile top of rock-socketed group piles (quadrilateral four piles) is more obvious.

Abstract:The fabricated structure is a kind of structural style,part or all cast-in-situ concrete components of which are replaced by the precast ones,and then transported to the construction site to assemble directly.The fabricated structure is convenient and quick for construction,harmless to environment and of high quality.Based on the analysis of the current application of the fabricated structure in the industry of water transport and water conservancy in China,and carrying out scheme comparison,we put forward a new fabricated pile foundation retaining wall structure in inland waterway revetment projects.It combines the L revetment with the precast square piles together by the reserved rigid connection,and we study its work mechanism and construction process.Combining with an engineering case,we use the vertical-elastic-foundation-beam method to create the three-dimensional model and determine the structure scheme.The conclusion is drawn that “the light component has advantages in fabricated structure”,which provides a train of thought and method for the design of the fabricated revetment.

Abstract:In view of the shortcomings of the current research and engineering application about bearing capacity recovery of precast pile,based on a marine engineering in West Africa,this paper puts forward the high strain method.The process of bearing capacity recovery of large diameter steel pipe pile after pile sinking is studied by using the test method of combination of initial beating of the same steel pipe pile with different stopping time.Combined with geological conditions,pile sinking and test results,the general law and influencing factors of the steel pipe pile’s bearing capacity,side resistance and end resistance change with time are obtained,and the research results are verified by static load test.This study not only improves the construction efficiency and reduces the cost of the project,but also gets some meaningful rules and conclusions,which can provide reference for the following similar projects

Abstract:For more and more ground settlement problems in large scale land reclamation projects,the paper has studied an often used settlement calculation method-De Beer method.Through the in-situ test data of support project,the parameters of De Beer calculation method has been studied,and an appropriate settlement calculation method has been obtained.At last,through the comparison of the predicted settlement of the measured data in site,the calculation method and process mentioned have been proved to be useful for settlement calculation in large scale land reclamation projects.

Abstract:A trapezoidal cross-section vertical pre-stressed anchor anti-slide pile is a new type of structure to manage water damage related landslide,and the characteristics of soil arch between piles are different from those of conventional anti-slide piles.It is obviously unreasonable to continue using the traditional anti-slide pile and soil arch model.In this paper,the formation characteristics of soil arch between piles are analyzed,the calculation model of trapezoidal anti-slide pile is established,the calculation formulas of pile spacing in different forms are derived respectively,and the pile spacing of each algorithm is compared by engineering application.At the same time,based on the calculation of pile spacing,the influence of pile side angle on pile spacing is analyzed,the design value range of pile side angle is defined,and the better angle value is discussed,providing theoretical reference for projects of the same kind.

Abstract:The position and pose of the tooth are difficult to be tested after the completion of the cutter or the reparation of the adapter.The traditional method is difficult to accurately locate the cutter tooth.Based on the fixed point coordinates provided by the inspection device,we deduce the blade in the benchmark and space state of composite transformation between two coordinate systems with middle coordinate system,obtain the expression form of transformation matrix,establish the spatial position and pose of the cutter,and solve the problem of the cutter tooth space positioning.The results show that the technology can be used for the space positioning of the tooth quickly,and can be used for the position and pose of the tooth after the cutter is made or the adapters are repaired.

Abstract:To improve the construction efficiency,reduce labor cost and fuel consumption of the trailing suction hopper dredger,we carry out a research on the automatic control system for the discharge pipe operation.During dredging,the discharge pipeline is often blocked by slurry under the traditional semi-automatic dredging control system when it is operated by many people due to the complicated environmental condition and operation process.Four automatic controllers including the automatic dredging suction system (ADSS),automatic light mixture overboard (ALMO),automatic jet-pump controller (AJC) and automatic button mud-door controller （ABMC）are designed to realize the full-automatic control of the discharge pipe system,which can improve the slurry flow rate,reduce slurry concentration,and prevent slurry plugging.Meanwhile,the system can reduce the labor cost and fuel consumption,and improve greatly the dredging efficiency of the trailing suction hopper dredger.

Abstract:In order to solve the problem of fixed-point installation of accropodes in the Yangpu Port,this paper presents a fixed-point installation process of accropodes.Using the RTK system to make the plane coordinate of RTK mobile station coincide with accropodes and configuring tablet as location information interaction terminal,the process improves the installation accuracy and efficiency.Compared to the other process,the fixed-point installation process of accropodes with RTK system is more accurat and efficient,but lacks in installation interconnection.Fixed-point installation process of accropodes with RTK system is economical and feasible.