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Limnology

pp 1–14 | Cite as

Stratification and mixing processes associated with hypoxia in a shallow lake (Lake Kasumigaura, Japan)

  • Eiji MasunagaEmail author
  • Shunsuke Komuro
Research paper

Abstract

Physical processes associated with hypoxia events in a shallow lake, Lake Kasumigaura, Japan, are investigated with long-term mooring observations at the middle of the lake basin. Results show that strong stratification during the summer suppresses vertical mixing resulting in hypoxia in the bottom boundary layer. The dissolved oxygen decreases due to the limited oxygen supply under strongly stratified conditions. The intensity of the stratification is controlled by the ratio between surface wind stress and the surface incoming buoyancy flux. The Monin–Obukhov length scale explains the stratification and shows good agreement with the Froude number and Wedderburn number. The stratification is also enhanced by the heat flux towards the sediments, reaching O (100) W m−2, during the summer season. In addition to field observations, this study conducted numerical simulations to further investigate mixing structure. Results from numerical simulations indicate that the bottom sediment heat flux significantly contributes to mixing and stratification in the lake. This study suggests that mixing processes associated with winds and heat flux at surface and bottom sediments are the key to understanding hypoxia events in Lake Kasumigaura.

Keywords

Mixing Hypoxia Heat budget Kasumigaura Numerical simulations 

Notes

Acknowledgements

This study is supported by the JSPS Grant-in-Aid for Scientific Research (No. 19K20432). We thank the staff operating the mooring systems at the Kamaya Mooring Station (Japan Water Agency). The authors gratefully acknowledge the laboratory staff, Mr. Daiki Asaoka and Ms. Tomoko Ozawa, for their assistance with the deployment of a mooring array and data collection.

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Copyright information

© The Japanese Society of Limnology 2019

Authors and Affiliations

  1. 1.Center for Water Environment StudiesIbaraki UniversityHitachiJapan
  2. 2.Ibaraki Kasumigaura Environmental Science CenterTsuchiuraJapan

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