Submitted as: model description paper 17 Sep 2021

Submitted as: model description paper | 17 Sep 2021

Review status: this preprint is currently under review for the journal GMD.

Reconsideration of winds, wind waves, and turbulence in simulating wind-driven currents of shallow lakes in the Wave-current Coupled Model (WCCM) version 1.0

Tingfeng Wu1, Boqiang Qin1, Anning Huang2, Yongwei Sheng3, Shunxin Feng4, and Céline Casenave5 Tingfeng Wu et al.
  • 1Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, Jiangsu 210008, P.R. China
  • 2School of Atmospheric Sciences, Nanjing University, Nanjing 210023, P.R. China
  • 3Department of Geography, University of California, Los Angeles, CA 90095, USA
  • 4China Institute of Water Resources and Hydropower Research, Beijing 100038, P.R. China
  • 5MISTEA, University of Montpellier, INRAE, Institut Agro, Montpellier, France

Abstract. Winds, wind waves, and turbulence are essential variables and playing critical role in regulating a series of physical and biogeochemical processes in large shallow lakes. However, parameterizing winds, waves, currents and turbulence and simulating the interaction between them in large shallow lakes haven’t been evaluated strictly because of a lack of field observations of lake hydrodynamics process. To address this problem, two process-based field observations were conducted to record the development of summer and winter wind-driven currents in Lake Taihu, a large shallow lake in China. Based on these observations and numerical experiments, a wave-current coupled model (WCCM) is developed by rebuilding expression of wind drag coefficient, introducing wave-induced radiation stress, and adopting a simple turbulence scheme, and then used to simulate wind-driven currents in Lake Taihu. The results show that, the WCCM can accurately simulate the upwelling process resulting from the wind-driven currents during the field observations. Comparing with other model, there is a 42.9 % increase of WCCM-simulated current speed which is mainly attributed to the new expression of wind drag coefficient. Meanwhile WCCM-simulated current direction and field are also improved due to the introduction of wave-induced radiation stress. Furthermore, the use of the simple turbulent scheme in the WCCM makes the simulation of the upwelling processes more efficient. The WCCM provides a sound basis for simulating shallow lake ecosystems.

Tingfeng Wu et al.

Status: open (until 22 Nov 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on gmd-2021-229', Anonymous Referee #1, 11 Oct 2021 reply

Tingfeng Wu et al.

Tingfeng Wu et al.


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Short summary
Most hydrodynamic models were initially developed based in marine environments. They can not be directly applied to large lakes. Based on field observations and numerical experiments of a large shallow lake, we developed a hydrodynamic model by adopting the new schemes of wind stress, wind waves and turbulence for large lakes. Our model can greatly improve the simulation of lake currents. This study will be a reminder to limnologist to prudently use ocean models to study lake hydrodynamics.