Abstract:Hydrodynamic models have been widely applied to river and coastal engineering projects. Understanding the hydrodynamic process is a prerequisite to modeling the pollution and sediment transport process. Hydrodynamic models of varying degrees of complexity should be selected appropriately according to the object of study, physical properties of the flow domain and hydrodynamic features. The essential procedure of hydrodynamic simulation is described in this paper. The main problems such as selection of model dimension in physical space, choice of variables, boundary conditions, initialization, design of computational grid, model resolution, parameterization of smaller scale fluctuations and sub-grid scale processes, model calibration and verification are investigated.

Abstract:In this paper, the water resources development and water environment protection in Chongqing is analyzed systematically by investigating and monitoring for water, especially, the water ecology protection in Three-gorges reservoir region is discussed. It is proposed that there should be five protection systems for water formed in Chongqing and it is of great value to the authorities concerned.

Abstract:In this paper, the application of reinforced earth technique, principle and calculation method, new reinforced materials developed and produced are introduced. A few of key technical problems in reinforced earth application is discussed, such as reinforced earth behavior, calculation method, durability of reinforced material, amendment and complement of the current standards. Then, the reinforced earth technique development and advancement were introduced.

Abstract:In this paper, based on data of field measurement, physical model & math model, an analysis on bed load in the changing backwater-area of the three gorges reservoir is carried out. The unrecognized problems on bed load of the research achievements up to now were brought forward.

Abstract:An experimental research on the 22 samples of Chongqing sandstone was carried out on the INSTRON press machine. Based on the experimental results, the failure types in the four applied loading paths were analyzed. The deformation and strength properties of Chongqing sandstone were discussed. The quadratic functional relations between the confined pressing and the maximal strain (or the maximal deviated stress) were proposed, which could be applied to the estimating the maximal deformation and strength of Chongqing sandstone under different confined pressing.

Abstract:The present paper gives a discussion about transport coefficient of suspended sediment, coefficient of saturation recovery, riverbed sediment grading, deposition/scour thickness and normalization of the sediment composition in gravel dominantly riverbed. The math model above mentioned has been tested in two rivers with different riverbed sediment composition and a rather good agreement has been obtained.

Abstract:This paper introduces the features of the modern shore structure-the tied buttressed retaining wall without bottom between buttresses. The design specification, main point of design and calculation procedure for the structure is discussed.

Abstract:The water resource is a material base for living and development of human beings, it is also an important component for study of the strategy for sustainable development of the today's society. In this paper, from the situation of water resource in Chongqing, according to the problems in development and utilization of water resource, some countermeasures are suggested to solve the problem of water deficiency and promote the sustainable utilization and development of the water resource.

Abstract:In this paper the stabilization of ground reinforced by plastic drain board is analyzed and calculated by reliability method. The reliable index is calculated by polyhedron error function, based on studying variability of the shearing strength of reinforced ground. The standard of ground stable index is proposed through some practical works.

Abstract:In this paper, the equations of ship and current motion model are established. The calculation of the ship manipulative capability parameter is consistent with the measured in static stream. Through the ship motion model, the layout of the navigation route and the change of the ship manipulative capability parameter due to the Yangtze River Bridge in Sutong City are studied.

Abstract:The frequency aperture given in this paper is a new method that describes the fracture aperture composition. The aperture curve plays a role in describing the aperture distribution and uniformity. In particular, the frequency hydraulic aperture is of great importance in seepage analysis. It overcomes limitations of hydraulic aperture and mean aperture. Based on existing information, the result of example calculation shows that the hydraulic aperture e h equals to the median aperture e 50 . This paper also obtains that the frequency hydraulic aperture e sh equals to e 48 through finite element numerical modeling for various type of random fracture.

Abstract:Based on the field data of berthing velocity for the ship (10000t-50000t), the berthing velocities have been numerically simulated by using Monte Carlo method in this paper. After statistical tests, it shows that the maximum values of the berthing velocity follow a Gumber distribution and the probability curves of failure for the means of maximum values are also obtained. The present results have been compared with the ones determined by specification of harbor engineering both at home and abroad.

Abstract:Even if pulled by single wire rope, the axle-linked cable-car can under some conditions automatically balance the eccentric moment caused by the carried loads. This paper expounds the self-balance principles of the four-wheel axle-linked cable car, deduces the associated formulae and analyzes the conditions for its application, laying a theoretic foundation for the design of transverse container cable car.

Abstract:In this paper, the effects of construction nearby the river or across the river are analyzed on navigation conditions, such as navigation scales, navigation flow conditions, navigation way, navigation method and navigation aids. Some safety measures during its construction are presented.

Abstract:The Citong Bridge is located in the river estuary section with 4 meter tide range and mixed geological structure. In this paper, the technique for construction of the main bridge pier was presented in detail, which consists of the construction process, technological requirements, main construction parameters and amendment on defects. It is of great value for reference to the similar works.

Abstract:Variation of flow condition caused by the multi-purpose regulation scheme is investigated on the basis of measured data in river model test. The flood control of the upper river, safety of the bridge, navigation and the evolution of the river are analyzed. A reasonable and feasible project alternative and the improvement of measurement are proposed.

Abstract:In this paper the amendment of No.18 pile in 19th pier of Citong Bridge in Quanzhou city is presented. There is a soft layer 6.41m thick in No.18 pile,a site cast concrete pile,due to breakdown of guide tube during casting. Amended by consolidation grouting, the pile stood up to tests. The construction technology, adopted steps and test method were introduced. It can serve as reference to similar engineering.

Abstract:In this paper, the advanced construction technology and site management applied in bid construction part B of Yangtze River bridge in Jiangyin was presented in detail. This bridge is the largest span bridge in China, where the advanced technology applied is: 3-d coordinate control surveying in bridge tower, small powder for artificial pile, over-form and climb form in construction of tower column, temperature control for casting mass concrete. It is of great value for reference to large bridge building.

Abstract:In this paper,the software developed on the basis of Windows platform is introduced, which is used in Chencun Waterway hydraulic model experiment. The efficiency in data analyzing and post processing has been improved. Since the various techniques in Windows platform (such as OLE, DDE) has been adopted, the development works are more efficient and an experimental analytic software with powerful and perfect functions can be developed conveniently.

Abstract:采用可靠度分析的蒙特卡罗法，对土坡稳定可靠度进行了分析，并以工程事例为例，讨论了计算模型以及土性参数的均值和变异系数对可靠指标的不同影响，并对可靠指标和安全系数度量土坡稳定的合理性进行了一定的比较。

Abstract:The mechanism of self-purification of pollutant was studied from three aspects-transporting, dispersing and decaying & conversing inside river water, and in this paper the mathematical models of pollutant transporting, dispersing and decaying & conversing were set up.Then,in this paper the mechanism of turbulent current diffusion of pollutant was discussed. Finally, a calculation example is given.

Abstract:Among 194 bacterial strains isolated from three representative sludge samples, 14 strains, which could produce efficient MBF, were obtained after screening and re-screening. These MBF had shown positive effects on treatment of four kinds of selected wastewater. However, after examining the hereditary stability of flocculation activity for bacteria, most of the strains lost their ability in producing effective MBF except for the I-41 strain. The I-41 is a bacillus G + amphibacterium. Meanwhile, the model of MBF-producing bacteria is found in this trail program.

Abstract:In this paper the partial differential equation of coordinate transformation is computed by the finite difference formulations and some examples were computed and illustrated in pictures.

Abstract:Based on analysis of the natural conditions of Taiwan Strait and conditions for navigation of Fujian and Taiwan harbors, the direct navigation across Fujian-Taiwan Strait and selection of optimal ship type are investigated.

Abstract:Geobelt is the main strengthening component in reinforced structure. Accurate selection of geobelt leads not only to reduction of cost, but also to assuring the safety of structure.In this paper the application and performance of CAT steel-plastic composite is summarized and the prospect of popularizing its application is pointed out.

Abstract:For the stability analysis of the reinforced earth retaining wall with cohesive backfill, this paper assumes that the state of failure surface is circular sliding surface and the bearing capacity is straight line relation with capacity and length of the reinforcement strip. These formulas agree with actual state of the reinforced earth retaining wall with cohesive backfill and result in saving reinforcement material in the design.