干旱区研究

Arid Zone Research >

2021 , Vol. 38 >Issue 3: 629 - 639

DOI: https://doi.org/10.13866/j.azr.2021.03.05

Water Resources and Ulilization

Change law of water temperature and dissolved oxygen concentration of Wuliangsu Sea in icebound period

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  • College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot 010018, Inner Mongolia, China

Received date: 2020-07-22

  Revised date: 2020-11-11

  Online published: 2021-06-17

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Abstract

The wavelet analysis method was used to analyze the trend of temperature and oxygen concentration of a water body under ice in Ulansuhai in 2019, and the time series was one month: from January 24 to February 24, 2019. The results showed that the water temperature and oxygen concentration of the lake were stratified. The oxygen concentration in the surface layer did not change. However, the oxygen concentration decreased in the middle (0.32 mg·L-1∙d-1) and bottom (0.05 mg·L-1∙d-1) layer. The main period of static water temperature in the surface layer was 25 d and 16 d. Under the first principal period, the period was about 15 d. The main period of static oxygen concentration was 23 d, and the average period was 15 d. The main period of static water temperature in middle layer was 14 d, and the main period of static oxygen concentration was 19 d and 7.5 d. Under the first principal period, the average period of static water temperature was about 9 d, and the average period of static oxygen concentration was 5 d. The main period of water temperature in the bottom layer was 14 d and 2.5 d, and the oxygen concentration was 24 d and 10 d. The period of change in water temperature was about 8.5 d, and the average period of oxygen concentration was about 7 d. The wavelet coherence spectrum results showed that there is a complex relationship between lake water temperature and the oxygen concentration, suggesting the water temperature shows an inverse phase relationship with the oxygen concentration in the surface and bottom layer of the lake. Additionally, on the 2-4 d cycle scale, the change of water temperature in the middle layer was about 2-4 h ahead of the change in dissolved oxygen concentration.

Key words： Wuliangsu Sea; icebound period; water temperature; dissolved oxygen; wavelet transform

Cite this article

ZHAI Jialun,SHI Xiaohong,LIU Yu,ZHAO Shengnan,BAO Wenzhi,LI Guohua . Change law of water temperature and dissolved oxygen concentration of Wuliangsu Sea in icebound period[J]. Arid Zone Research, 2021 , 38(3) : 629 -639 . DOI: 10.13866/j.azr.2021.03.05

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