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Based on the flow induced motion energy conversion system, the combined triangular prisms with the section form and stiffness as variables to evaluate the amplitude, frequency and other indicators was studied. The combined triangular prisms were selected for model test, as well as the influence of arrangement and stiffness on the combined triangular prisms were studied by changing the arrangement of the prisms and system stiffness. The aim is to explore the optimal condition for flow induced motion of the three triangular prisms in different arrangements, and to expand ideas for subsequent research on flow induced motion of multiple oscillators. The experimental results show that all the combined triangular prisms have good performance with different stiffness. Both the motion of type I prism and type III prism perform typical vortex induced vibration with the increase of flow velocity, the type I prism has the best performance. [ABSTRACT FROM AUTHOR]

The allowable differential air pressure in compartments of composite bucket foundation is of great significance for its safe transportation. For the problem of the allowable differential air pressure during floating transportation of composite bucket foundation, taking the floating project of composite bucket foundation in an offshore wind power project as the background, the influence of the allowable differential air pressure of composite bucket foundation with the change of parameters such as external draft and diameter of composite bucket foundation, the bulkhead thickness, and air pressure in compartments were quantitatively analyzed based on finite element software ABAQUS. The results show that: the maximum allowable differential air pressure increases exponentially with the increase of draft and bulkhead thickness. But the maximum allowable differential air pressure on bulkheads is more sensitive to the change of draft, rather than bulkhead thickness. The addition of reinforcing ribs to the bulkheads has a significant increase of 20% ~ 35% in the maximum allowable differential air pressure of composite bucket foundation. For a specific maximum allowable differential air pressure, the optimal solution in the safe combination of the variation parameters of foundation can be selected according to the actual engineering needs. [ABSTRACT FROM AUTHOR]

In order to improve the deterioration of water quality caused by seasonal water temperature stratification in reservoirs and lakes, this paper was focused on exploring the characteristics of the internal wave induced by the underwater landslide movement and the damage characteristics of water stratification structure by artificially induced internal waves through the disturbance of underwater landslide. The results show that a)the stratification of the water destroyed by the underwater landslide is mainly caused by the disturbance of the upper and lower layers, and the effect of the internal wave is lasting and slow; b) The slope of the landslide and the motion speed of landslide have an important impact on the damaging effects of stratified water; c) The scale of internal waves generated by a landslide at an angle of 45 degrees is greater than that generated by a landslide at an angle of 60 degrees. [ABSTRACT FROM AUTHOR]

The aim is to solve the problem of increasing the energy dissijDation rate during the flood discharge witii ag¬gravating the downstream atomization， and to explore the influence of different flip buckets on atomization of down¬stream. Based on the physical model test， the downstream nappe wind distribution，the splash-water distribution， the hydraulic characteristics of trajectory nappe and the scour pattern were studied. The research shows that:① The downstream nappe wind speed of the asymmetrical tongue-shaped bucket，the standard tongue-shaped bucket and the curved surface bucket are generally larger than that of continuous bucket. # For the asymmetrical tongue-shiaped bucket， on the left side of spillway axis， the splash intensity is greater than that of the right sides. the maximum difference of the rainfall intensity between the left and right sides is 5 ■ 625 g/( m2 - min ) . but for the distribution of curved bucket is opposite， on the right sides of spillway axis，the splash intensity is greater than that of theleft sides. the maximum difference of the rainfall intensity between the left and right sides is 45 ■ 125 g/( m2 - min). ③ With the increase of the distance between the control point and the impinging pint，the number and the volume proportion of the large water droplets decreased sharply % with the increase of trajectory angle， both the trajectory nappe width of continuous bucket and tongue-shaped bucket are increase % and the depth of scour pool decreases witii the decrease of trajectory angle.④ When adopting the flip bucket whose curved surface is attached to the proper side wall， which can reduce the atomization influence % and the erosion damage of downstream can be reduced by increasing the trajector angle. [ABSTRACT FROM AUTHOR]

Agent-based modeling (ABM) has enriched the theory and methods of research in water resources management. Better understanding of the state-of-the-art of ABM and its potential in the field of water resources management can promote institutional development and reform in China􀆳s water resources management system. In this paper, while ABM of water resources management (WR-ABM) is defined, its key components—agent decision rules and agent interactions—are identified and their modeling approaches are summarized. Various WR-ABMs applied in basinscale optimal water allocation, urban household water use and agricultural water management published during the period of 2009—2018 are carefully reviewed. Future research on the use of WR-ABMs that should address the challenges and weakness in the water resources management are discussed and several research directions are recommended herein: ① further expanding the use of complex adaptive system theory in the field of water resources management; ② coupling ABM and water resources system models that include uncertainties; ③ exploring the use of machine learning algorithms in the decision-making modeling; ④ improving the methods used in the model parameter calibration, result verification and validation; ⑤ using standard documentation protocol, such as the ODD protocol, for the description of models; and ⑥ achieving comprehensive and optimal balance between completeness and simplification in model design. [ABSTRACT FROM AUTHOR]