Method for determining main dimension of building in inland river channel improvement

Abstract

The invention discloses a method for determining a main dimension of a building in inland river channel improvement. The method comprises the following steps: selecting a cross section of a river channel and dividing the cross section into n flow belts with equivalent flow rate along the width direction of the river channel; determining a relational expression between the flow velocity of the flow belts and water depth; calculating to obtain the flow velocity, flow rate and water depth of corresponding flow belts before implementing the improvement; assuming the main dimension parameter of each building after implementing the improvement, and using assumed parameters to carry out analog computation to obtain total flow velocity change values and flow velocity values generated by all buildings at the corresponding flow belts after the improvement of a project is implemented; calculating the water depth of each corresponding flow belt after the improvement of the project is implemented; therefore, calculating to obtain the minimum value of the water depth of a dredged channel after implementing the simulated improvement of the project. If an absolute value between the minimum value of the water depth of the dredged channel and the difference of a designed waterway depth is less than or equal to a set threshold value, the main dimension parameter of the assumed building is set up; if not, the main dimension parameter of the assumed building is repeatedly assumed until the parameter is less than or equal to the set threshold value. The method is generally suitable for river regulation at a normal ford, a staggered ford and a bifurcated river reach.

Description

technical field [0001] The invention relates to a method for regulating a river channel, in particular to a method for determining the main dimensions of a building for regulating an inland waterway. Background technique [0002] At present, the main dimensions of inland waterway regulation buildings are mainly determined by the regulation parameters. The regulation parameters include the regulation water level and the width of the regulation line. Among them, the elevation of the building is taken as the height equal to the water level of the remediation, and the plane dimensions such as length and height are determined by the width of the remediation line. This approach is mainly derived from the theoretical system of small and medium rivers. [0003] Specifically, first use the bed-making flow method, beach level method, critical water level method, and empirical value method to calculate the remediation water level to determine the elevation of the remediation building,...

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Problems solved by technology

[0004] It can be seen from the formula that the H on the right 1 / H 2 require H 2 >H 1 Only when the width of the river can be narrowed and the flow velocity of the water flow can be increased in the shallow area. Generally speaking, this expression is only applicable to the shoal in the normal transition section. For a shoal with a deep pool on its side, the average water depth of the cross section taken in the deep pool water area is H 1 Often greater than H 2 , according to formula (1), not only does not need to narrow the river width, but also needs to increase the river width, this conclusion is obviously unreasonable

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