COMPARATIVE ANALYSIS OF WATER TEMPERATURE AT DIFFERENT DEPTHS IN THE WELL OF YIMEN COUNTY,YUNNAN PROVINCE
Based on the water temperature observation data of Yimen wells at depths of 138.5 m and 153.0 m,we comprehensively analysed the morphology and rate of change of the daily and annual water temperature curves at different depths,and compared and analysed the synchronicity and difference characteristics of the a-nomalous changes of the water temperature data at different depths of Yimen wells.It is found that the daily amplitude and first-order difference fluctuation of daily mean value of water temperature in the same layer of Yimen wells are basically the same for a long period of time,while the daily amplitude and first-order differ-ence fluctuation of daily mean value of water temperature at 138.5 m is obviously larger than that at 153.0 m.The water temperature at different depths shows basic changes of daily and annual temperature curves.The long-term trend of water temperature at different depths is basically the same-small oscillation upward trend,but the rate of increase of water temperature at 153.0 m depth is slightly faster than that at 138.5 m depth.When wa-ter temperature anomalies occur,comparative analyses of water temperature data from different depths in the same well are carried out to preliminarily investigate the synchronicity and variability of water temperature a-nomalies at different depths in the Yimen well.
Yimen wellsDifferent depthsWater temperature observationsChange characteristics
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