Universal method for deducing and solving multistage composite type fracture surface water level flow relationship
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A general method and cross-section technology, applied in water conservancy projects, river regulation, water conservancy engineering equipment, etc., can solve problems such as calculation methods that rarely pay attention to the relationship between water level and flow in multi-level compound sections
Active Publication Date: 2018-03-20
云南省水利水电勘测设计院有限公司
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However, these methods are all proposed for the two-level complex section, and little attention is paid to the calculation method of the water level and flow relationship of the multi-level complex section
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Embodiment 1
[0048] A section is a symmetrical compound section with no vegetation on the beach (such as image 3 Shown), main groove bottom width b m =0.75m, groove depth d=0.15m, slope coefficient S=1, bank width b f = 2.25m, the main trough and beach are made of concrete lining, relatively smooth, the river bed gradient of the section where the section is located is 1.027‰, the water level and flow relationship of this section is calculated.
[0049] Adopt the technical scheme of the present invention to deduce the step of the water level flow relation of this section as follows:
[0050] Step 1: Select points C and F, and divide the section into 3 sub-sections along the vertical direction, which are recorded as k=1, 2, 3 in turn, then b 1 =b 3 = 2.25m, b 2 = 1.50m, d 1 = d 3 = 0.15m.
[0051] Step 2: The main trough and the beaches on both sides are relatively smooth, and there is no vegetation coverage, that is, take m k =0, the Manning roughness coefficients of the three sub-...
Embodiment 2
[0061] A certain river is a three-level asymmetric compound section covered by vegetation, such as Figure 5 shown. The total width of the target section is 100m, of which the width of the second level beach is b 1 = 25m, terrace height d 1 =1.4m, the width of the first level beach b 2 = 25m, terrace height d 2 =1.0m, main groove width b 3 =50m, and the slope coefficients are all 0. Rigid vegetation is regularly planted on the secondary beach. The plant height is 1.2m, the diameter is 0.06m, the row spacing is 0.25m, and the plant spacing is 0.5m. The riverbed gradient of the section where the section is located is 0.4‰.
[0062] Adopt technical scheme of the present invention to deduce the step of the water level flow relation of section shown in embodiment 2 as follows:
[0063] Step 1: Select points C and E, divide the target section into 3 sub-sections along the vertical direction, and mark them as k=1, 2, 3 in turn, then b 1 =b 2=25m,b 3 =50m,d 1 = 13.6m, d 2 =...
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Abstract
The invention provides a universal method for deducing and solving the multistage composite type fracture surface water level flow relationship. The method includes the following steps that firstly, measured data of a target fracture surface are acquired, the fracture surface is divided into M+N+1 sub-fracture surfaces, and the M+N+1 sub-fracture surfaces are further classified as seven composition elements; resistance dividing is performed on the sub-fracture surfaces, f<k>=f<bk>+f<vk>, wherein f<vk>=4lambda<k>C<D>D<k>m<k>h<k> is a resistance coefficient generated due to plant dragging, and the Manning coefficient (please see the formula in the specification) of the sub-fracture surfaces is calculated, the apparent shear stress of each element is calculated, the momentum balance relationof the sub-fracture surfaces is built, and therefore the matrix equation of three diagonal coefficient matrixes is obtained; and the matrix equation is solved in a chasing method, the fracture surfaceaverage flow speed of the sub-fracture surfaces is obtained, and therefore the water level flow relationship of the sub-fracture surface is obtained. The method has a unified expression, Excel or programming can be conveniently adopted for performing calculation, and the universal method can be applied to deducing and solving of the water level flow relationship of the multi-stage composite typefracture surface including a two-stage composite type fracture surface, and is a calculation method easy and convenient in calculation and high in precision.
Description
technical field [0001] The invention belongs to the technical field of water conservancy engineering and water conservancy engineering, and specifically relates to a general method for calculating the water level and flow relationship of multi-stage compound sections. Background technique [0002] In order to adapt to the bed-making effect of different flows, natural rivers are mostly two-level or multi-level compound cross-sections. In addition, urban rivers are often designed as two-level or multi-level composite sections to reduce the impact of flood control measures on the river corridor landscape and increase the water-friendly space of residents along the coast. A complex section usually consists of a deep main channel and relatively shallow one or more flats. The main channel serves as a transport channel during the dry season, and the flat serves as a flood channel only when flooding occurs during the flood period. Due to the discontinuity of the section and the fac...
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