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

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...

AI Technical Summary

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

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