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Modeling the Impact of Wind Drag Coefficient on Wind-Driven Currents in Lake Taihu, China

Chunyue Zhu / Yanbin Dou / Guohua Yu / Junjun Yu / Jiaqing Liao / Ang Gao / Zhengxian Zhang / Chenhui Wu

The wind drag coefficient, $C_{d}$ , has a great influence on the numerical results obtained from shallow lakes. To analyze the modeling impacts of $C_{d}$ on wind-driven currents, a series of numerical simulations of Lake Taihu were conducted at three grid resolutions (800 m × 800 m, 400 m × 400 m, and 100 m × 100 m) using the empirical formulae of Flather (F76), Large and Pond (LP81), Large and Yeager (LY04), Andreas (A12), and Gao (G20). The G20 formula produced the optimum results of all the formulae for both the water level and velocity simulations; however, the grid resolution was found to have a significant influence on simulation in G20 cases. Thus, the G20 formula is only recommended when using a high-resolution grid to meet the accuracy requirements of analyzing wind-driven currents in the numerical modeling of Lake Taihu. A combination of the A12 formula and a coarse grid is preferred when taking computational efficiency into consideration.

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Modeling the Impact of Wind Drag Coefficient on Wind-Driven Currents in Lake Taihu, China

Chunyue Zhu / Yanbin Dou / Guohua Yu / Junjun Yu / Jiaqing Liao / Ang Gao / Zhengxian Zhang / Chenhui Wu

The wind drag coefficient, $C_{d}$ , has a great influence on the numerical results obtained from shallow lakes. To analyze the modeling impacts of $C_{d}$ on wind-driven currents, a series of numerical simulations of Lake Taihu were conducted at three grid resolutions (800 m × 800 m, 400 m × 400 m, and 100 m × 100 m) using the empirical formulae of Flather (F76), Large and Pond (LP81), Large and Yeager (LY04), Andreas (A12), and Gao (G20). The G20 formula produced the optimum results of all the formulae for both the water level and velocity simulations; however, the grid resolution was found to have a significant influence on simulation in G20 cases. Thus, the G20 formula is only recommended when using a high-resolution grid to meet the accuracy requirements of analyzing wind-driven currents in the numerical modeling of Lake Taihu. A combination of the A12 formula and a coarse grid is preferred when taking computational efficiency into consideration.

Modeling the Impact of Wind Drag Coefficient on Wind-Driven Currents in Lake Taihu, China

Chunyue Zhu / Yanbin Dou / Guohua Yu / Junjun Yu / Jiaqing Liao / Ang Gao / Zhengxian Zhang / Chenhui Wu

The wind drag coefficient, $C_{d}$ , has a great influence on the numerical results obtained from shallow lakes. To analyze the modeling impacts of $C_{d}$ on wind-driven currents, a series of numerical simulations of Lake Taihu were conducted at three grid resolutions (800 m × 800 m, 400 m × 400 m, and 100 m × 100 m) using the empirical formulae of Flather (F76), Large and Pond (LP81), Large and Yeager (LY04), Andreas (A12), and Gao (G20). The G20 formula produced the optimum results of all the formulae for both the water level and velocity simulations; however, the grid resolution was found to have a significant influence on simulation in G20 cases. Thus, the G20 formula is only recommended when using a high-resolution grid to meet the accuracy requirements of analyzing wind-driven currents in the numerical modeling of Lake Taihu. A combination of the A12 formula and a coarse grid is preferred when taking computational efficiency into consideration.

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Title:

Modeling the Impact of Wind Drag Coefficient on Wind-Driven Currents in Lake Taihu, China

Contributors:

Chunyue Zhu (author) / Yanbin Dou (author) / Guohua Yu (author) / Junjun Yu (author) / Jiaqing Liao (author) / Ang Gao (author) / Zhengxian Zhang (author) / Chenhui Wu (author)

Published in:

Water, Vol 16, Iss 20, p 2985 (2024)

Publication date:

2024

ISSN:

DOI:

https://doi.org/10.3390/w16202985

Type of media:

Article (Journal)

Type of material:

Electronic Resource

Language:

Unknown

Keywords:

wind drag coefficient , wind-driven current , shallow lake , numerical modeling , Hydraulic engineering , TC1-978 , Water supply for domestic and industrial purposes , TD201-500

Metadata by DOAJ is licensed under CC BY-SA 1.0

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