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Method for predicting tidal estuary water level process

A prediction method and water level technology, applied in water conservancy engineering, water conservancy engineering equipment, instruments, etc., can solve the problems of insufficient forecasting accuracy and representativeness

Active Publication Date: 2021-07-06
CHINA THREE GORGES CORPORATION +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method for predicting the water level process of a tidal estuary, which can overcome the defects of insufficient prediction accuracy and representativeness. Through mathematical simulation and wavelet Decomposition and reconstruction operations clarify the contribution of tidal clusters in different periods to the influence of the estuary water level (tide level) process, and improve the accuracy and applicability of the historical data of estuary hydrological stations in the application of water level (tide level) prediction

Method used

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  • Method for predicting tidal estuary water level process
  • Method for predicting tidal estuary water level process
  • Method for predicting tidal estuary water level process

Examples

Experimental program
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Effect test

Embodiment 1

[0038] like figure 1 As shown, a method for predicting the water level process of a tidal estuary, the method includes the following steps:

[0039] Step 1: Collect hourly water level data from water level measuring stations in the estuary area for one month or more to form a "water level (η)-time (t)" relationship sequence, such as figure 2 As shown, through the harmonic analysis, the main semidiurnal equinox (M 2 ), solar main semidiurnal equinox (S 2 ) with amplitudes of 1.2m and 0.6m respectively.

[0040] Step 2: Collect topographic data and river flow data in the estuary area, and use them as boundary conditions and upstream input conditions for hydrodynamic simulation, and combine the "water level (η)-time (t)" relationship sequence of the water level measuring station in the estuary area to obtain the estuary area The "water level (η)-time (t)" relationship sequence at any position, specifically:

[0041]The model calculation area is set as the 600km long river se...

Embodiment 2

[0067] Embodiment two (technical effect comparison embodiment)

[0068] Image 6 For respectively showing the water level process predicted by the method of the present invention, the water level process predicted by the harmonic analysis method and the water level process obtained by actual measurement (ie Image 6 "raw sequence").

[0069] from Image 6 It can be clearly seen from the figure that there is a big difference between the water level process based on the harmonic analysis and the measured water level process, which is reflected in the time mismatch between the corresponding peaks or peaks and valleys of the two, and there is a difference of 2-3m in the specific water level values. In contrast, the prediction process of the method of the present invention is basically consistent with the measured water level process, which proves that the method of the present invention has the technical effect of improving the prediction accuracy of the water level process.

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Abstract

The invention discloses a method for predicting a tidal estuary water level process. The method comprises the following steps: 1, forming a 'water level (eta)-time (t)' relation sequence; 2, acquiring a 'water level (eta)-time (t)' relation sequence of any position of the estuary region; 3, obtaining a convolution result of a water level time sequence corresponding to each time-frequency domain; 4, obtaining a W<n>(s) accumulation result corresponding to each partial tide cluster period; 5, reconstructing a water level time sequence corresponding to the moisture cluster of each period; 6, representing the water level process of the specific spatial position in the step 3; and 7, repeating the steps 3-6, and determining a water level process relational expression of any spatial position, so as to realize the prediction of the tidal estuary water level process. According to the tidal estuary water level process prediction method provided by the invention, the defects of insufficient prediction precision and representativeness can be overcome, and the accuracy and applicability of estuary hydrological station historical data in water level (tide level) prediction application are improved.

Description

technical field [0001] The invention relates to the technical field of estuary intelligent management, in particular to a method for predicting the water level process of a tidal estuary. Background technique [0002] Tidal estuaries are important channels for the exchange of land and sea materials, which affect the evolution of landforms, the stability of ecosystems, and the production and life of residents. Departments of water conservancy, energy, shipping, and fishery pay close attention to changes in estuary water levels, set up field water level measuring stations, and conduct water level forecasts by reconciling and analyzing historical data from the measuring stations. In the open sea area, the water level change is only affected by tidal wave movement, and this method can achieve high prediction accuracy. The water level in the estuary area is affected by the nonlinear superposition of river runoff and ocean tidal currents, and presents the characteristics of sever...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/28E02B1/00G06F111/10G06F113/08G06F119/14
CPCG06F30/28E02B1/00G06F2111/10G06F2113/08G06F2119/14
Inventor 赵汗青冯浩川戴会超刘志武蒋定国梁犁丽翟俨伟张玮翟然徐志杨恒卢韦伟杨媛殷兆凯刘琨陈昂李梦杰
Owner CHINA THREE GORGES CORPORATION
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