Abstract:

Abstract:Mountainous rivers are mainly characterized by many shoals, rapids and curved channels. Based on the waterway regulation projects of Luzhou to Chongqing and Yibin to Luzhou reaches located in the upper reach of Yangtze River, this paper analyzes some main factors of systemic treatment and comprehensive treatment approaches for long reach and puts forward design methods of systematic treatment for the long reach, which can provide reference for the systematic treatment on mountainous rivers.

Abstract:This article presents the fundamental states of the management of the Jingjiang reach since the Tenth Five-Year Plan, and summarizes the characteristics, preliminary results and general experience of the waterway management, and gives advice such as unified planning, stepped implementation, far & near combination,dynamic management, offensiveness and defensiveness to enhance the durability of the project and set up coordination mechanism of the Jingjiang management.

Abstract:Shashi river reach is a famous blocking waterway of the middle Yangtze River. According to the General Outline of the Development and Plan of the Main Waterway of the Yangtze River, the construction standard in 2020 here is 3.5 m×150 m×1 000 m, and the navigation rate is 98%. In consideration of the operation of Three Gorges project and external factors such as flood prevention, management of Shashi river reach is underway adhering to the principle of comprehensive management and progressive implementation. The first-stage construction and Lalinzhou protection construction was launched in progression since 2009, which improved the navigation condition greatly and achieved good effects. This paper analyzes the changes of the waterway and navigation conditions before and after the project based on the existing researching achievements and project data after project implementation,and puts forward ideas on follow-up regulation according to the general regulation idea and existing problems in this river reach.

Abstract:Based on the existed research results and field data, this paper analyzes the recent evolution regularity, navigation-obstruction characteristics, as well as main problems of the waterway, and then predicts the river evolution trend according to the model results. Firstly, the necessity of waterway regulation project is analyzed.According to the development demands of the reach, this paper discusses the necessity of waterway regulation in the reach, and then proposes the regulation ideas and tentative scheme under consideration of the navigation-obstruction characteristics and waterway regulation targets. The research results concerning the bed evolution, navigationobstruction characteristics and scheme comparison and selection may serve as reference for the follow-up systematic regulation engineering.

Abstract:The development of branch channel will certainly destabilize the navigation condition in main channel. Hence the restrictive measures on developing branch channels are carried out in recent waterway regulation projects. This paper carries out a comparison study on flow and sediment transport characteristics based on the before and after project observed data in Majiazui channel. The flow dynamic conditions of branch channel development and the effect of the controlling projects are also analyzed from the standing point of the adaptation of river dynamic. Moreover, the deficiency of the Majiazui waterway regulation project and the improvement measures are also presented. The cognitions of branch channel waterway regulation are also summarized based on above analyses.

Abstract:As a type of regulation structure, fishbone dike exerts an important role in channel regulation works of the middle and lower Yangtze River. Daijiazhou river section is a typical braided section on the middle and lower Yangtze River. Based on the channel regulation project of Daijiazhou river section, this paper describes the design scheme of fishbone dike works, and summarizes the methods and parameters-selecting of design of fishbone dike, which is of far-reaching importance to make an in-depth realization on the application of fishbone dike in the channel regulation of a braided river section, and can provide a design reference for fishbone dike adopted in the channel regulation of similar river sections.

Abstract:Based on the physical model, we analyze the feature of flow and sediment movement and study regulation scheme. After project implementation, this plan has an immediate effect on basis of surveying the practical ability of beach passing of ship. It can clearly be seen it is very effective to implement the scheme that the gravel rapid should be dredged at the upstream and reclaimed at the downstream on the dry rapids.

Abstract:The paper analyzes the evolution characteristics of Taipingkou channel on the middle reach of the Yangtze River, and compares it with the experiment results concerning the evolution trend of the bridge section after the impoundment of the Three Groges reservoir. Practice shows that it is a success to predict the bed evolution trend by the model experiment, which provides a scientific basis for the determination of waterway regulation scheme and engineering implementation.

Abstract:Based on the analysis of the bed evolution characteristics and causes of navigation obstruction of the Yaojian river course, and by the river model experiment, this paper studies a variety of regulation schemes and at last determines the recommended scheme for the first phase project. After implementation of the project during 2008 and 2009, the waterway condition has been improved obviously and the dry-water channel has been keeping smooth.

Abstract:This paper studies the general hydraulics of the inflow of tributaries to the curved reach by the conceptual model, reveals the variation characteristics of surface geometry and surface slope and distribution law of 3D-velocity,hydrodynamic axis and bed shear stress under various confluence angles and various discharge ratios,presents the condition in which the recirculation zone could appear near the concave bank downstream the junction,and gives the quantitative relationship between the scale of recirculation zone and confluence angle & discharge ratio. This paper also analyzes the bed load movement and riverbed erosion and deposition site at the junction. It lays a good foundation for further study on this kind of rivers.

Abstract:In July 1997, Robert Davinroy published his paper Application of Micro-scale River Engineering Model in Mississippi River in the journal of Civil Engineering, in which he introduced a new patented technique for Micro Scale Physical Modeling. A physical model with relatively big scale and large variability was adapted to simulate hydrodynamics and sediment transport in rivers. This technique has been applied to many research projects successfully, such as channel regulation in Mississippi and Missouri, investigation of living environment of fish and wild animals. The experiment cycle is as short as numerical models and it’s more intuitive. Besides it can also provide good accuracy even compared with those large scale river engineering models. Because there are not many details given in his article, we will continue to investigate this technique based on his introduction in order to provide reference for waterway regulation engineering projects of the Yangtze River.

Abstract:This paper presents a high-resolution two-dimensional finite-volume numerical model with twoorder accuracy for flow characteristics at open channel junction. The governing equations of the model comprise the shallow water equations with bed slope and resistance source. A high-resolution numerical method governing equations, which may accurately capture shocks, is adopted. To alleviate the problems associated with numerical instabilities due to small water depths near a wet/dry boundary, the friction source terms are treated in a fully implicit way. Finally, the measured data for open channel junction is used in the present model. Results indicate that present model may well simulate the flow characteristics at open channel junction.

Abstract:The rapids shoal is one of the three navigation-hampering shoal types in mountain rivers: shoal, rapids shoal, dangerous shoal. This paper introduces and evaluates the five available methods for determining the hydraulic parameters of the rapids shoal abating, i.e. experiential analysis method, resistance of navigation method,prototype vessel test method, model vessel test method and mathematical model vessel test method. According to the typical standard ship type, this paper studies the hydraulic parameters of the rapids shoal abating for Yibin-Chongqing section in the Yangtze River by the resistance of navigation method and model vessel test method. It may be applied to the regulation design of the rapids shoal channel.

Abstract:The damage of beach protection belt by the water current force is very prominent in the channel regulation. Based on the destruction phenomenon of the actual project, this paper analyzes the main influential factors for the damage of the beach protection belt, carries out a stress analysis, investigates the damage mechanism,and proposes several solutions, which are applied to other projects. A relatively mature structural type of beach protection belt is proposed.

Abstract:This paper takes the Yangtze River Wuqiao waterway as an example that is under the influence of complex external factors. By model tests, we have combined with regulation effects and external condition requirement, Confirmed the final regulation works plan. The plan is longitudinal dam and teeth dams scheme.It accumulates some experiences for regulation works in complex external environment, and can be an example for similar projects.

Abstract:There are many sand-pebble shoal in the upper stream of the Yangtze River. Because the hydraulic power and sediment transport are strong, regulating structures are usually destroyed. The paper sums up the damage position and analyses the reason of damage. Stabilization fabrics are recommended on the basis of maintaining practice for several years.the including dam concrete surface, accropode, and riprap-stack, ect., which have been applied to the upper reach of the Yangtze River etc. The conclusion may be refered to for maintenance or construction of waterway regulation engineering.

Abstract:Yibin to Chongqing section of the Yangtze River waterway was constructed systematically since 2003 according to the standard of grade III channel. According to the river regime and navigation-obstruction situations, we took regulation measures including simple dredging, longitudinal dike with ground sills, dredging,spur dike with spur and longitudinal dike, dredging, dam construction with river bottom protection, as well as shallow governance, etc. in the process of the construction. The regulation measures and effect for the shoal were analyzed based on the engineering example.

Abstract:The concrete tetrahedron permeable frame is a new river bank protection technology. The laboratory tests and actual project applications show that this new permeable frame has a very obvious effect on flow deceleration and sediment deposition, and it is better than traditional beach and bank protection technology. Thus the new structure and technology are worth popularizing.

Abstract:For the influence of ship’s pose on measurement accuracy in bathymetric survey with GPSRTK, considering the special situation of the mountainous river’s large scale mapping, this paper analyzes the pose correction mathematical model with the transformation of the GPS antenna hull coordinate system VFS, the hull transducer coordinate system VFS and the geographic coordinates GRF. It provides some useful conclusions for correct understanding and pose error correction when using GPS-RTK.

Abstract:The inland river quota was used widely in the middle-lower Changjiang waterway regulation project since promulgated from1998, and achieved good results at cost control. The inland river quota also exposed some problems, such as smaller construction ship and machine, lower labor cost unit price, and lower construction mechanization level. Moreover, new structure and new material quota can’t meet the real demand. Related solutions for these problems are proposed based on a discussion, which can provide reference for the improvement of the inland river quota and serve the Changjiang waterway regulation project better.

Abstract:Based on the characteristics of many shoal and rapids,rise and fall abruptly of the water level,ubiquity of graved bedload,it puts forword higher requirement on structure and material of regulating on mountainous river.According to the finished waterway regulation engineering of the upper Yangtze River reach of Luzhou to Chongqing and Yibin to Luzhou,this paper summarize the application of new structure and material,construction technology and so on that used and fit well in this river,obtains a number of application examples.The experience provides some reference for waterway regulation on another mountainous rivers.

Abstract:Based on the analysis of the advantages and disadvantages of beach protection belts structure and considering the need of regulation works of navigation channels in Jiayu-Yanziwo section on the middle reache of the Yangtze River, the paper proposes a new style of beach protection belts structure, i.e. anti-scour wall, which has been used successfully.

Abstract:Bank protection is one of the most important means for waterway regulation, and land revetment is the important part of bank protection. Hybrid revetment structure is applied to the rectifying and administering project of Ouchikou water channel, and the effect is obvious: it improves the efficiency of revetment engineering,upgrades the outward appearance, and cuts down the engineering cost under the prerequisite of guaranteeing the engineering quality and safety.

Abstract:Based on the comparative analysis on strengths and weaknesses as well as adaptabilities of revetment structures of various waterway regulation projects, and integrating the characteristics of the ecological revetment structure of steel wire grid with new materials and structures, this paper analyzes its adaptability in application and discusses its advantages combining with its application effect in the regulation project. Based on the analysis of the construction process of steel mesh gabion cushion revetment in waterway regulation project and combining with the research on the construction process of plant and grass revetment, this paper probes into the ecological revetment construction technology in the waterway regulation project.

Abstract:Considering the requirements of the Wuxue waterway regulation project, which is carried out in the middle reaches of the Yangtze River, this paper presents an investigation of the advantages, disadvantages and destruction reasons of the traditional dam structure in channel regulation projects. Furthermore, according to the Wuxue waterway conditions, new dam body structural types, i.e. box dam and sand pillow bag-concrete covered dam are proposed and applied successfully in the project. The prospects of the new dam body structure are forecasted based on the application effects of the new dams.

Abstract:Based on the construction practice of waterway regulation engineering of the Yangtze River,this paper researches the construction technology of mattress sinking along the current, and provides a parameter combination which is characterized by high construction efficiency and safety, and solves the problems easily occurred in the mattress sinking including improper overlapping of the sinking mattress, mattress breaking, as well as indent mattressing, etc.

Abstract:The underwater concealed engineering is the key and difficult point for the quality control of the Yangtze River waterway regulation engineering. The underwater concealed engineering detection technology plays an important role in the Yangtze River waterway regulation engineering. This paper introduces the underwater concealed engineering detection technology, its classification and application in the Yangtze River waterway regulation engineering, which are of great importance for the recognition of the function of underwater concealed engineering detection technology in the Yangtze River waterway regulation engineering, and which provide reference for the maintenance engineering design of the Yangtze River waterway.

Abstract:The channel improvement projects are distributed in different river sections of the Yangtze River, with many concealed works. It is difficult for the traditional management mode to achieve timely management and full coverage. This paper makes a detailed analysis of the application of long-distance video monitoring technology to the Yangtze River channel improvement project construction and management and presents that this technology will help to improve the project construction level and effects and have broad application prospects.

Abstract:Due to the operation of the Three Gorges junction, it becomes unavoidable to conduct waterway regulation project during the flood period in the middle and lower reaches of the Yangtze River. Taking measures including establishment of a sound quality monitoring system, laying stress on construction monitoring, focusing on the prevention of common quality defects, implementing the safety responsibility of supervision, implementation of essential safety of new technology and method of flood period, strengthening the construction protection for the working staff, controlling construction of major hazard sources during flood period, the quality and safety for the construction of the Yangtze River waterway regulation are ensured.

Abstract:Based on the analysis of two typical river revetment constructions, we analyze the serious problems in the muddy slope and seepage slope engineering, and put forward quality control measures and process suggestions.

Abstract:The Yangtze River waterway regulation of underwater riprap, which belongs to typical concealed work, has several purposes, such as slope protection, toe protection, bottom protection, and dam construction. The main role is to strengthen the governance and protection of the bank slope and riverbed, prevent the bank collapse,bank slope and riverbed soil erosion caused by water erosion, enhance the anti-erosion ability of the river bed,stabilize the structure of river regime and riverbed, and improve the flow of the watercourse through the riprap dam conditions, so as to optimize the main channel of navigation conditions. Taking the Heishazhou sandbar waterway renovation project on the lower reach of the Yangtze River as an example, this paper probes into the underwater riprap construction technology of the Yangtze River waterway regulation project, and gives a description of the quality control links such as the stone material’s selection, gradation control, dumping process, debit measurement,and quality inspection.

Abstract:Due to the changes in the Yangtze River waterways, the implementation of the channel improvement project is influenced by various factors. To carry out the dynamic management is the intrinsic requirement of the channel improvement project. This paper presents the necessities of the application of dynamic management to the Yangtze River channel improvement project construction and management and gives a detailed analysis of its application through three successful cases, which may serve as reference for the implementation of similar projects in the Yangtze River waterway or other rivers.