Joint Determination Method of Bed-Building Flow and Flat Water Level in Tidal Reach

Abstract

The invention provides a method for jointly determining bed-building flow and flat beach water level of a tidal river reach. The method comprises the following steps: step 1, calculating hourly flow,tide level and sand content of a target section by using a one-dimensional non-constant water-sediment mathematical model; step 2, determining a sand content-flow lag response relationship and a sediment transport equivalent flow series of the target section; 3, carrying out sediment transport equivalent flow-tide level combined frequency statistics on the target section; and 4, calculating the bed building intensity of the target section, and solving the bed building flow and the flat beach water level of the target section by using a graphical method. According to the method, the characteristic of sand content lag under the tidal action is comprehensively considered, various combined frequencies of the flow and the tide level and the influence of the combined frequencies on the bed making action are considered, the bed making flow and the flat beach water level of the target section can be obtained at the same time, and the method is clear in physical meaning, objective and accuratein result, easy to operate and quite convenient to apply in practice.

Description

technical field [0001] The invention belongs to the technical field of water conservancy and water transport engineering, and in particular relates to a method for jointly determining bed-making flow and flat water level in tidal river sections. [0002] technical background [0003] The tidal river section is close to the estuary of the river. It is the channel for the river to transport flood and sediment into the sea. It is also an important waterway connecting the inland and the ocean. Large-scale river improvement is often required. In the practice of river regulation projects, bed-making flow and flat water level are widely used as important parameters in riverbed evolution analysis, river regulation planning, and regulation engineering design. Whether the value determination is reasonable or not will directly affect the cost of river regulation , effect and even success or failure. [0004] Bed-making flow refers to a certain flow range that has the strongest effect o...

AI Technical Summary

Problems solved by technology

However, these methods still do not consider the characteristics that the change of sediment concentration lags significantly behind the change of flow rate, nor do they consider the influence of tide level fluctuation on bed formation. The factors are not comprehensive enough, and the parameters are empirical. Sections with strong fluctuations cannot meet the needs of river improvement planning and engineering design

Images