Roughness coefficient prototype observation and determination method for long-distance water conveyance canals

A technology for long-distance water delivery and roughness prototyping, applied to measuring devices, instruments, etc., can solve problems such as unreliability, waste of manpower, material resources, and missing valuable opportunities for prototype observation, and achieve the effect of rapid setting and improving work efficiency

Active Publication Date: 2015-11-25
CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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Problems solved by technology

However, among the 7 test sections, the uncertainty of the roughness measurement results of 3 sections is close to 10%, which becomes u...

Method used

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  • Roughness coefficient prototype observation and determination method for long-distance water conveyance canals
  • Roughness coefficient prototype observation and determination method for long-distance water conveyance canals
  • Roughness coefficient prototype observation and determination method for long-distance water conveyance canals

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Embodiment 1

[0037] This embodiment is a prototype observation and measurement method for the roughness of a long-distance water delivery channel. The steps of the method are as follows, and the flow process of the method is as follows: figure 1 Shown:

[0038] Steps for preliminary roughness prototype observation scheme: used for preliminary prototype observation flow Q 0 , determine the location of the downstream measurement section, and determine the water depth of the section y 20 , the preliminary measurement section spacing L 0 . Firstly, survey and observe the channel to be measured, and select its multi-year average water delivery flow as the prototype observation flow according to the channel’s years of operation. At the same time, select a canal section with a regular cross-section shape and a smooth channel direction, and set a measuring section downstream of it. The water depth of this section is measured, the distance between the sections is initially planned, and the u...

Embodiment 2

[0084] This embodiment is an improvement of Embodiment 1, and it is the allowable relative uncertainty of the measurement of roughness in Embodiment 1 K 1 The value range of is refined. The roughness measurement described in this embodiment allows relative uncertainty K 1 The value range is: 1%~5%.

[0085] K 1 The value reflects the level of people’s requirements for the accuracy of roughness measurement. For channel projects with sufficient water head and short distance, the influence of roughness error is relatively small, and people’s requirements for measurement accuracy can be lower. K 1 Take a large value; for channel projects with tight water head and long distance, the impact of roughness error is relatively large, and people have high requirements for measurement accuracy. K 1 Should take a small value.

Embodiment 3

[0087] This embodiment is an improvement of the first embodiment, and it is the lower boundary value of the roughness trial calculation of the first embodiment K 2 The refinement of the value range. The lower boundary value of roughness trial calculation described in this embodiment K 2 The value range is: 0.005~0.01.

[0088] K 2 The value reflects people's judgment on the deviation range between the roughness design value and the measured value, and is mainly affected by the channel design and construction level. For long-distance water delivery channels, the design unit usually has rich engineering experience, sufficient demonstration of the design scheme, high level of construction mechanization, strict quality control, and a small deviation between the roughness design value and the measured value, usually within 0.005, and a small value is desirable; for small and medium-sized For large-scale channels, the level of design and construction is relatively low, and the...

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Abstract

The invention relates to a roughness coefficient prototype observation and determination method for long-distance water conveyance canals, and the method comprises steps of initially drafting a roughness coefficient prototype observation scheme, calculating the water depth of an upstream measuring section, calculating the sensitivity coefficient, calculating the root-mean-square deviation of a measuring instrument, assessing the relative uncertainty of the prototype observation scheme, adjusting, actually measuring, calculating and determining. The method adopts the measurement uncertainty theory, so that the scientificity of the prototype observation scheme can be assessed, the comprehensive influences of the water level, the precision of a flow measuring instrument, the flow, the separation distance of the measuring sections on the uncertainty of the roughness coefficient measured results can be analyzed, the reasonable value can be determined according to the set relative uncertainty; and the roughness coefficient prototype observation is made accordingly. In the calculating process, the change along the canal of the structure and the hydraulic characteristics of the long-distance water conveyance canal is seriously considered, the roughness coefficient is solved by adopting a constant gradually varied flow equation in a differential form, the prototype observation scheme can be scientifically and quickly set, the work efficiency is improved, and waste of unnecessary labor and material resources can be avoided.

Description

technical field [0001] The invention relates to a prototype observation and measurement method for the roughness of a long-distance water delivery channel, which is an observation and measurement method for hydraulic design parameters. Background technique [0002] Roughness ( n ) is a comprehensive representation of the roughness of the channel surface and the irregular shape of the side wall, and is also a comprehensive coefficient expressing the resistance of water flow through the channel, reflecting the design, construction and management level of the channel project. Roughness is an important parameter that determines the water passing capacity of a channel. For long-distance water delivery channels, a small deviation between the actual roughness and the designed roughness will have a major impact on the project cost and future operation management. Accurately measuring the real roughness of the channel through prototype observation can provide parameters for reviewin...

Claims

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Application Information

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IPC IPC(8): G01B21/30
CPCG01B21/20G01B21/30
Inventor 崔巍陈文学穆祥鹏白音包力皋黄子一刘慧杨星
Owner CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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