Research Of The Curved Guide Wall In Dam-less Water Intake Projects

Building water intake facilities along the rivers to take water for industrial production,agricultural irrigation, and drinking is one of the main ways to use water resources for human.According to the water use and its characteristics, how to design the water intake facilitiesreasonably to ensure water security is the key problem for water intake design and planning.Generally, water intake works can be divided into two categories, one is dam intake project，the other is dam-less water intake project. Comparing the dam-less and dam water intakeprojects, the investment of dam-less water intake project is smaller, and it also makes asmaller impact on river morphology and the surrounding environment. However, it oftensubjects to natural river flow, water quality, which may affect the normal operation of thewater intake works.The realignment of water intake reaches by means of auxiliaryengineering measures, will largely overcome the impact of the above-mentioned problemsand ensure the normal water requirements.We need to consider and resolve the following issues when planning and designing thedam-less water intake project:a. Ther iver mainstream should often be near the water intake gate;b. To meet the requirements of the design water intake flow, a certain water level must berequired;c. P reventing sediment deposition before the water intake gate and avoiding a large sumof coarse sediment enter the aqueducts;d. Preventing the erosion of the water intake gate to ensure the safety of the projects;For the water intake location, in addition to considering the artesian requirements and thecorresponding geological conditions, we should pay attention to the impact of channelevolution and sediment movement on the water intake gate and conduct a comprehensiveanalysis of the evolution of the river in the water intake planning and designing. Based on theabove considerations, for the industrial dam-less water intake works, which demand the lowquantity of water volume and high water guaranteed rate. we proposes a new dam-less waterintake aided measures——curved guild wall under the curve circulation principle, minimumrate of energy theory and the theory of branching channel. Taking the minimum energyconsumption rate as the objective function and combining with the flow of sediment transportconditions and the flow and sediment diversion theory of branching channel to establish constraint equations to optimize the layout parameters. Meanwhile, combining with theLanzhou aluminum plant industrial dam-less water intake project, by carrying out the modeltest to verify the applicability and promote the value of the ancillary works. To providetheoretical reference for the artificial remediation measures designing and planning in thewater intake reaches which have the similar water requirements and flow of sedimenttransport conditions and river regime characterized.Rational arrangement of the artificial engineering measures is a prerequisite for the safeoperation of the project. But we should also pay attention to the upstream and downstream ofthe water intake rectification work, mean while, we should combine with the artificialmeasures and the rectification works to ensure the safe operation of the projects. On the otherhand, we should pay more attention to a variety of effects on the river due to the constructionof water intake projects.