Method for calculating ice cover roughness of canal

A technology of roughness and ice cover, applied in the field of calculation of river channel ice cover roughness, can solve the problem of large error

Active Publication Date: 2020-01-17
CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to differences in channel boundary conditions, topographical conditions, channel locations and trends, natural ice sheets exist in various forms under different seasons, temperature and flow conditions, resulting in a large error between the roughness estimated by empirical methods and the actual situation

Method used

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  • Method for calculating ice cover roughness of canal
  • Method for calculating ice cover roughness of canal
  • Method for calculating ice cover roughness of canal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] This embodiment is a method for calculating the roughness of the ice cover of a river channel. The steps of the method are as follows, and the process is as follows figure 1 Shown:

[0029] Step 1, set the measurement section: for the natural river channel, where the shape of the river bed is relatively regular and the water flow is relatively stable on the frozen ice surface; for the water diversion channel, choose the frozen ice surface position at a certain distance between the control gate and the water diversion; set the two distances as L The measurement section j with j +1 if figure 2 shown.

[0030] First of all, find a suitable section of river section on the ice-covered section to be measured. The requirement for this section is: it is best to be near the hydrological station, so as to be able to obtain logistical support for surveying in cold seasons, that is, to be able to carry out regular surveys. The measured river section, or the river section where...

Embodiment 2

[0097] This embodiment is an improvement of the first embodiment, and is a refinement of the first embodiment on the measurement section. The selected measuring sections described in the present embodiment are more than two, namely:

[0098] j =1,2,..., N ; The average roughness of the measured roughness of each measuring section for:

[0099] ,

[0100] in, N is the number of measuring sections, which is a positive integer greater than 1; L j for measuring section j with j the distance between +1; n j The comprehensive roughness measured for each measuring section; the roughness in steps 4 and 5 n average roughness Instead of doing calculations.

Embodiment 3

[0102] This embodiment is an improvement of the above embodiment, and is a refinement of the above embodiment on the roughness of the channel ice cover. The roughness of the channel ice cover described in this example is verified by a physical model.

[0103] In order to verify the effectiveness and feasibility of the above ice sheet roughness inversion algorithm, an indoor physical model test was established for verification.

[0104] A 20m-long simulated natural wide and shallow compound cross-section channel is established, and the compound cross-section channel is made of plexiglass material, so as to facilitate the observation of the experimental flow state and flow velocity. The flow velocity was measured by ADV (Acoustic Doppler Velocimeter) and PIV (Particle Image Velocimetry). The flow rate is adjusted by the frequency converter, and the water level is measured by the probe.

[0105] Considering that the laboratory uses plexiglass (roughness about 0.0085) to simulat...

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Abstract

The invention relates to a method for calculating ice cover roughness of a canal. The method comprises the following steps: setting a measurement section; performing measurement; partitioning; calculating the comprehensive roughness of the riverway; and calculating the ice cover roughness of the riverway. The method comprises the following steps: firstly, accurately measuring each parameter of a frozen canal by adopting technologies such as river ice water mechanics and hydrological survey; the comprehensive roughness of the canal is calculated through the parameters, the ice cover roughness is deduced through the comprehensive roughness, correct calculation and evaluation of the ice cover roughness of the canal are achieved, and bases and references are provided for safe operation scheduling of the canal under the freezing condition in winter, correct evaluation of the water delivery flow, scientific response to accidents such as ice disasters and the like.

Description

technical field [0001] The invention relates to a method for calculating the ice cover roughness of a river channel, which is a hydraulic engineering method and a method for calculating important parameters for controlling and regulating water flow in a channel. Background technique [0002] When the canal freezes in winter, the water flow changes from an open flow to an undercurrent. The ice sheet acts as a constantly changing solid boundary, which makes the water flow conditions of the canal very complicated, resulting in a decrease in the flow capacity of the canal, and also brings new challenges to the operation and scheduling of the canal in winter and ice prevention and disaster reduction. Many difficulties. The ice sheet roughness has become an important parameter to determine the water transport capacity of the channel under the ice sheet, and the accurate calculation of the ice sheet roughness under different ice sheet and water flow conditions has also become the f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/10
CPCG06F17/10
Inventor 王涛郭新蕾付辉路锦枝郭永鑫李甲振纪平邹德昊曾利余弘婧胡志鹏
Owner CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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