《Tab.2 Average water temperature in different months and corresponding BOD5degradation coefficient a

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《南水北调中线总干渠典型渠段水体自净能力研究》

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According to the corresponding relationship between average water temperature and BOD5degradation coefficient in each month（Tab.2），the degradation coefficient increases with the increase of temperature.From January to March，the average water temperature is 9.5℃，and the average degradation coefficient is 0.028/d.In April，the water temperature rises to 14.7℃and the degradation coefficient increases to 0.039/d，while in July，the water temperature further rises to 26.5℃，and the degradation coefficient reaches 0.054/d.Fig.5shows that through the pairwise combination of different months，the logarithm difference of average water temperature difference and BOD5degradation coefficient shows a good linear relationship（P<0.01），the fitting slope lnθis 0.386，and the calculated temperature correction coefficientθis 1.039.