Correlation analysis between winter air temperature and water emperature of the Middle Route of South-to-North Water Transfers Project
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Abstract:
In the central and northern regions of China, due to the severe cold in winter, the inter-basin water flow will freeze, which will have a negative impact on the Middle Route of South-to-North Water Transfers Project. In order to investigate the relationship between the water temperature and the air temperature along the Middle Route of South-to-North Water Transfers Project, an equidistant sampling method was used to select a sluice gate about 200 km from south to north in the Middle Route of South-to-North Water Transfers Project as the data collection sample. A total of seven sluice gates were selected. The water temperature information of the selected sluice gates and the temperature information of the sluice gate location during the period from November 15, 2022 to February 28, 2023 were collected. The average temperature was used as the analysis object. The average temperature was the average of the highest temperature and the lowest temperature, and the water temperature at 18:00 was used as the the water temperature information of the sluice gate.By comparing the daily average temperature, water temperature, and 15-day moving average temperature of the seven sluice gates, it can be concluded that the trend of water temperature change is similar to the trend of 15-day moving average temperature change, and the fluctuation is consistent. The correlation characteristics of 15-day moving average temperature change and water temperature change along the Middle Route of South-to-North Water Transfers Project were studied. The data obtained by subtracting the temperature difference between the upstream and downstream sections from the water temperature of the sluice gate in the upstream section was compared with the water temperature in the downstream section. The specific steps were as follows: Step 1, the 15-day moving average temperature of the area where the upstream sluice gate was located from the 15-day moving average temperature of the area where the downstream sluice gate was located to obtain the temperature difference between the upstream and downstream regions. Step 2, subtract the temperature difference between the upstream and downstream regions obtained from the first step from the water temperature of the upstream control gate to obtain the second difference. Step 3, compare the second difference with the numerical value of the downstream regulating gate water temperature by drawing a curve.The data obtained by subtracting the 15-day temperature difference along the route from the sluice gate water temperature in the upstream section of the Middle Route of South-to-North Water Transfers Project and the sluice gate water temperature data in the downstream section were calculated using the Pearson correlation coefficient. The Pearson correlation coefficients were all above 0.95, indicating a significant correlation. In winter, the temperature difference from south to north (upstream to downstream) in the inter-basin water transfer project is the main manifestation that reflects the heat loss of the water body. According to the characteristics of the data obtained by subtracting the 15-day air temperature difference along the upstream section from the water temperature in the upstream section and the correlation characteristics of the water temperature data in the downstream section, it can provide a theoretical basis for adjusting the water delivery dispatching strategy during the ice period and preventing freezing disasters for the Middle Route of South-to-North Water Transfers Project.
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