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Method for estimating water level overrun time in open channel according to actually measured water level change conditions

A water level change and water level technology, applied in the field of channel scheduling and water conservancy information research, can solve problems such as long monitoring time, unsafe operation of units, and high risk

Active Publication Date: 2020-10-16
CHINA INST OF WATER RESOURCES & HYDROPOWER RES +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The unbalanced inflow and outflow of river canals will lead to continuous fluctuations in water levels. Long-term effects will cause water levels to break through the upper and lower limits, which may not only cause water level overflow, but also cause unsafe operation of the unit when there is a pumping station downstream.
[0005] At this stage, physical equipment is commonly used to monitor the water level trend to estimate the time when the water level reaches the limit water level under unbalanced flow. high risk issues

Method used

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  • Method for estimating water level overrun time in open channel according to actually measured water level change conditions
  • Method for estimating water level overrun time in open channel according to actually measured water level change conditions
  • Method for estimating water level overrun time in open channel according to actually measured water level change conditions

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Embodiment 1

[0061] Such as figure 1 As shown, in this embodiment, a method for estimating the water level overrun time based on the measured water level change in an open channel is provided, including the following steps,

[0062] S1, establish the simulation model of canal section;

[0063] S2. Based on the simulation model, determine the rate of change of flow per unit flow of the canal section;

[0064] S3. Based on the simulation model, determine the flow-water level-storage relationship of the canal section;

[0065] S4. Fit the measured downstream water level change curve, and obtain the upstream change flow according to the measured water level change rate obtained through the fitting combined with the flow rate change rate per unit flow of the canal section;

[0066] S5. Obtain an estimated time when the downstream water level exceeds the limit according to the upstream changing flow rate combined with the flow-water level-storage relationship of the canal section.

[0067] Th...

Embodiment 2

[0121] Such as Figure 2 to Figure 3 As shown, in this embodiment, taking part of the canal ponds of the Yangtze River to Huaihe River Project as an example, according to the description method of the present invention, using the model basic characteristic value combined with the monitoring water level in the actual project, the overrun time of the downstream water level in the unbalanced flow is calculated, and the description Effectiveness of the method of the present invention. It is assumed here that the digital actual monitoring value is the water level value simulated by the model.

[0122] Assuming that the entire canal section system operates according to the design flow and initial water level before the upstream inlet flow changes, and an emergency event occurs in the upstream of the canal section within 2 minutes, the design flow needs to be increased by 10%, but the middle water diversion still needs to meet the normal water diversion. Guarantee the water demand o...

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Abstract

The invention discloses a method for estimating water level overrun time in an open channel according to actually measured water level change conditions. The method comprises the following steps of: S1, establishing a simulation model of a channel section; S2, based on the simulation model, determining a flow change rate of the channel section under unit flow; S3, based on the simulation model, determining a flow-water level-storage capacity relationship of the channel section; S4, conducting fitting on an actually-measured downstream water level change curve, and acquiring upstream change flow according to an actually-measured water level change rate obtained by fitting and the flow change rate of the channel section under unit flow; and S5, acquiring estimated downstream water level overrun time according to the upstream change flow and the flow-water level-storage relation of the channel section. The method has the advantages that early warning can be effectively carried out, and overflow disasters and channel damage caused by overrun of a water level are prevented; corresponding reference can be provided for hydraulic regulation and control of subsequent channels; and comparedwith the early warning time obtained by only depending on the water level monitoring data under the traditional unbalanced flow, the calculation result of the method is improved in precision, and calculation efficiency is enhanced.

Description

technical field [0001] The invention relates to the technical field of channel scheduling and water conservancy information research, in particular to a method for estimating the water level overrun time in an open channel based on the measured water level change. Background technique [0002] With the development of society and economy, people's demand for water resources is increasing. The construction of large-scale long-distance water transmission projects has become the most effective and direct means to adjust the uneven distribution of water resources in time and space and solve the contradiction between supply and demand of water resources. The open channel water delivery method has attracted widespread attention due to its advantages of small project investment, low operating cost, large water delivery flow, and convenient construction. In recent years, with the further development of water diversion projects, the characteristics of water diversion have gradually te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q50/06G06F30/20
CPCG06Q50/06G06F30/20
Inventor 雷晓辉孔令仲李月强宋长松张召朱杰李谷涵
Owner CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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