River model plastic grass roughening method

A technology of river engineering model and plastic grass is applied in the field of roughening of river engineering physical model test, which can solve the problems of labor and material cost, and achieve the effect of simple and practical roughening method.

Inactive Publication Date: 2014-01-22
NANJING HYDRAULIC RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for roughening plastic grass of river engineering models, which solves the problem that the existing roughening technology of plastic grass requires a model verification test after each arrangement to determine whether the roughness requirements are met. If not, it is necessary to re-select the plastic grass mat , re-arranging, labor-intensive and material-intensive problems

Method used

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  • River model plastic grass roughening method
  • River model plastic grass roughening method
  • River model plastic grass roughening method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The river engineering model needs to know the roughness and flow conditions of the natural river. According to these conditions, the roughness n and the water depth H required by the model are calculated based on the roughness scale and vertical scale of the model. Assuming that the calculated model is rough Ratio n=0.022, model water depth H=about 0.10m, model roughness n and model water depth H are brought into the calculation formula proposed by the present invention: Calculate the required plastic grass spacing L=0.15m, the plastic grass adopts figure 1 The plastic grass shown (height 2.5cm, 9 petals, each petal length 4.2cm, widest 0.7cm, base diameter 1.2cm), according to Figure 5 Make a square grid as shown (side length L=0.15m), use a small amount of cement to glue the plastic grass on the model surface at the grid point ( Image 6 ).

Embodiment 2

[0024] According to the roughness and flow conditions of the natural river, the roughness n required by the model and the water depth H of the model are calculated from the roughness scale and vertical scale of the model. Assume that the calculated model roughness n=0.020, and the model water depth H =0.20m or so, the model roughness n and the model water depth H are brought into the calculation formula proposed by the present invention: Calculate the required plastic grass spacing L=0.16m, the plastic grass adopts figure 1 The plastic grass shown (height 2.5cm, 9 petals, each petal length 4.2cm, widest 0.7cm, base diameter 1.2cm), according to Figure 5 As shown, the square grid (side length L=0.16m) is produced, and a small amount of cement is used to glue the plastic grass to the model surface at the grid point to meet the roughening requirements of the model.

Embodiment 3

[0026] After understanding the roughness and flow conditions of the natural river, calculate the roughness n required by the model and the water depth H of the model based on the roughness scale and vertical scale of the model. Assume that the calculated model roughness n=0.028, and the model water depth About H=0.15m, model roughness n and model water depth H are brought into the calculation formula proposed by the present invention: Calculate the required plastic grass spacing L=0.09m, the plastic grass adopts figure 1 The plastic grass shown (height 2.5cm, 9 petals, each petal length 4.2cm, widest 0.7cm, base diameter 1.2cm), according to Figure 5 As shown, a square grid (side length L=0.09m) is produced, and the plastic grass is glued to the grid points of the model surface with a small amount of cement.

[0027] According to Examples 1-3, it can be concluded that the method of the present invention can predetermine the roughening distance of the plastic grass, avoiding...

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Abstract

The invention relates to a river model plastic grass roughening method. The method includes: using plastic grass, calculating roughening distance according to model roughness and water depth and a calculating formula, and roughening the surface of a model on the basis of the distance, wherein in the formula, n refers to model roughness, H refers to model water depth, and L refers to plastic grass roughening distance. The method has the advantages that the plastic grass is used for roughening, elasticity of the plastic grass is close to bottomland vegetation, necessary parameters (roughness and water depth) are tested through a river model to determining plastic grass roughening distance, labor and time consumption caused by blindness of plastic grass cushion and traditional plastic grass roughening are avoided, and the roughening method is simple and practical.

Description

technical field [0001] The invention belongs to the technical field of roughening of river engineering physical model tests for waterway regulation projects and water conservancy projects, especially can be determined by calculation according to the Manning roughness of the simulated natural river (hereinafter referred to as roughness) and the water flow conditions of the model test The plastic grass roughening method. Background technique [0002] The current roughening technology for river engineering model tests is mainly roughening small stones, and there are also cross-shaped, triangular, Y-shaped plastic blocks, plastic grass mats, etc. However, small stones, cross-shaped blocks, triangular blocks, and Y-shaped plastic bodies are mostly used for roughening river channels. These are rigid materials, and river beaches often have vegetation, mostly flexible plants such as reeds, and currently there are only small pieces. Stone is widely used in the roughening of river en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02B1/02
Inventor 姬昌辉谢瑞洪大林张幸农王永平于剑
Owner NANJING HYDRAULIC RES INST
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