Application of inverted data cleaning for flow monitoring stations in the middle route of the South-to-North Water Transfer Project
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Abstract:
With the further development of the informatization level of long-distance open channel water transfer projects, the distribution of monitoring stations along the project has become denser and denser, and the monitoring of water regime information and the quality of monitoring data has attracted more attention. The reliability and consistency of the flow monitoring data along the long-distance open channel water transfer project in time and space directly affect the accuracy of the water condition study and hydrodynamic numerical simulation.Taking the middle route project of the South-to-North Water Transfer Project as the research object, aiming at the abnormal phenomenon of the inverted flow of the monitoring station in the dispatching operation, the principle of dynamic balance of water volume and the longest sequence method of interval flow is adopted to construct the inverted data cleaning model of the flow monitoring station. The principle of water dynamic balance is used to calculate the water loss rate of the canal pool along the middle line project, and according to the water loss rate, the theoretical flow value of each control gate along the line is determined. By calculating the deviation of the actual monitoring data of each control gate relative to the theoretical flow data, the relative deviation is selected to be less than 1% for interval division. The interval longest sequence method is used to screen out the data to be modified. The water balance principle is used to modify the modified data. By comparing and analyzing the measured flow data and the theoretical flow data of the control gate, the number of control times of the control gate and the number of control times that occurred in the inverted flow phenomenon are counted, and the causes of the inverted flow phenomenon are summarized. A one-dimensional hydrodynamic model was constructed to verify the impact of data cleaning on the simulation model by taking the flow data before and after cleaning as the upper boundary conditions.A hydrodynamic model is constructed for verification based on the flow data after model cleaning as the upper boundary condition in the Baihe River to Huanghe River section of the middle line project. The results show that the cleaning model eliminates the inverted phenomenon in the flow monitoring data and improves the quality of the flow monitoring data. The mean absolute error of the water level in the front of the gate is reduced by 0.075 7 m and the root mean square error is reduced by 0.089 5 m in the hydrodynamic numerical simulation.Through the analysis of the causes of the inverted data, it is found that the monitoring data deviation of the control gate flow monitoring equipment and the interference of the gate control are the main influencing factors of the phenomenon. By comparing the results of hydrodynamic simulation, it is found that the upper boundary condition of flow data after cleaning can effectively improve the simulation accuracy. The results show that the cleaned flow data is superior to the measured flow data in data space logicality and consistency, which can be popularized and applied in practical engineering.
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