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The closure is one of the key links in the process of the construction of water conservancy and hydropower project . Its success or failure directly affects the duration and cost of the project closure , especially in high flow, high drop soft base riverbed , the river navigable throughout the year , even more is a difficult and arduous task . Closure of many ways, generally speaking can be summarized as flat block and vertical closure of two major categories of vertical closure method is the most widely used . To be safe , reliable, efficient , scientific implementation of the closure , it is necessary calculation and analysis of the various situations that may arise in the closure , especially the closure process in the flow rate of the hydraulic parameters and dumped material particle size determination in detail calculation , grasp the key factors of which , carefully, the careful the closure project planning, design and construction , to ensure the progress and security . Vertical Closure the Longkou hydraulic parameters as a major objective conditions affecting the success or failure of closure is always changing . In this paper, the riverbed cross - section with a flat - screen shape , hydraulic calculation and model test two angles , the the Longkou hydraulic parameters calculated automation and validate comparison ; and AutoCAD secondary development to achieve a model test topographic cross-section drawing automate common software ; hydraulic calculation method based on the diversion tunnel under the conditions of a single dike legislation calculated to intercept the flow of a general-purpose application software development . Finally, the use of the research results , Longtan Hydropower Station on the Red River closure preliminary calculations and model test results to verify , economic , reasonable , reliable closure scheme , and achieved satisfactory results .
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