Method for confirming drainage culvert position of water-saving check dam

Abstract

The invention discloses a method for confirming a drainage culvert position of a water-saving check dam. The method comprises the steps of according to a design scale of a check dam, extracting basicparameters of the check dam; carrying out calculation to obtain a change rate dG<engineering> / dy of engineering investment G<engineering> along with bottom height y of a drainage culvert according tothe extracted basic parameters; carrying out calculation to obtain dam land benefit annual increment change -x+ / deltah according to design annual benefit x and annual deposition thickness deltah of the check dam; carrying out calculation to obtain annual water loss benefit change cu<i+1> / deltah according to annual water loss negative benefit increment cu and the annual depositionthickness deltah of the check dam; and gradually increasing the bottom height y value of the drainage culvert, thereby obtaining a series of x<i+1> / deltah+cu<i+1> / deltah values, comparing the values with the -dG<engineering> / dy, and determining a corresponding y value as the determined bottom height of the drainage culvert when the difference of the values and the -dG<engineering> / dy isthe minimum. According to the method, the engineering investment of key drainage buildings such as the culvert, horizontal pipes, silos and a drainage chute can be effectively reduced, the check dam land building benefit is not reduced, the negative benefit of initial water storage ineffective evaporation is reduced, and a purpose of blocking mud without reducing water is achieved.

Description

technical field [0001] The invention relates to the technical field of check dams, in particular to a method for confirming the position of a discharge culvert of a water-saving check dam. Background technique [0002] Check dams are an effective measure to control gully erosion in the Loess Plateau region. They can not only hold back floods and retain sediment, control soil erosion, but also silt up land to create fields and increase grain production. Therefore, they are widely used in the Loess Plateau region. Warping dams generally consist of "two major pieces" or "three major pieces". The "two major pieces" refer to the dam body and the water discharge structure, or the dam body and the spillway; the "three major pieces" refer to the dam body, the water discharge structure and the spillway. The "two big pieces" and "three big pieces" check dams are generally equipped with water discharge culverts, which are located in the dam body, and the drainage inlet is connected to...

AI Technical Summary

Problems solved by technology

If the location of the discharge culvert is low, the culvert, the horizontal pipe (or vertical shaft), and the steep drainage channel downstream of the culvert are all longer, and the engineering volume and investment are relatively large. To ensure that the dam land can be cultivated and harvested earlier, and the benefit will be earlier. At the same time, the ineffective evaporation loss of the initial water storage in the dam reservoir is also small, so the accumulated benefits over the years are relatively large; Pipes (or shafts) and culvert exit steep drainage grooves are also relatively short, and the amount of work and investment are relatively low. However, within the service life of the check dam, the flood in the reservoir cannot be drained earlier, and the dam land is cultivated and harvested later. , the benefit is late, and at the same time, the ineffective evaporation loss of the initial water storage in the reservoir is also large, and the amount of water discharged to the downstream channel is reduced, so the accumulated benefits for many years are small, and the existing technical scheme does not clearly propose that the water discharge culvert should be located in the dam body. The determination method of vertical position

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