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<p>Effective studies have been conducted in the field of water quality simulation, including thermal stratification, selective withdrawal and eutrophication modeling using the CE-QUAL-W2 model. In this model, the wind sheltering coefficient (<i>WSC</i>) plays a significant role in the calculations of the wind-induced shear stress and subsequently the reservoir thermal gradient. The trial and error method, which is time-consuming, is used to determine <i>WSC</i>. Due to the spatial variations of the wind across the water surface, the lack of a criterion for assigning values to the <i>WSC</i>, hinders the accurate tuning of its values during the calibration process. In this study, the wind shelter index (<i>Sx)</i> was introduced to the CE-QUAL-W2 model as a criterion to achieve the spatial distribution of the wind shelter condition of the points on the water surface. Therefore, a more accurate and faster calibration method was devised using <i>Sx</i> to determine <i>WSC</i> and estimate the thermal gradient in different parts of water bodies. The results showed that by using <i>Sx</i> in the temperature calibration of the CE-QUAL-W2 model, there was no need for trial and error in finding the best value for <i>WSC</i>, and the RMSE was reduced from 0.35 to 0.44 range to 0.20–0.25 range.</p>

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Improving CE-QUAL-W2 Calibration Using a Terrain-Based Wind Sheltering Coefficient Tuning Method

  • 期刊论文

  • 发表日期：

    2025年1月14日

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  • Zahra Shahi,
  • Mohammad Reza Sharifi,
  • Mohammad Zakermoshfegh

摘要

Effective studies have been conducted in the field of water quality simulation, including thermal stratification, selective withdrawal and eutrophication modeling using the CE-QUAL-W2 model. In this model, the wind sheltering coefficient (WSC) plays a significant role in the calculations of the wind-induced shear stress and subsequently the reservoir thermal gradient. The trial and error method, which is time-consuming, is used to determine WSC. Due to the spatial variations of the wind across the water surface, the lack of a criterion for assigning values to the WSC, hinders the accurate tuning of its values during the calibration process. In this study, the wind shelter index (Sx) was introduced to the CE-QUAL-W2 model as a criterion to achieve the spatial distribution of the wind shelter condition of the points on the water surface. Therefore, a more accurate and faster calibration method was devised using Sx to determine WSC and estimate the thermal gradient in different parts of water bodies. The results showed that by using Sx in the temperature calibration of the CE-QUAL-W2 model, there was no need for trial and error in finding the best value for WSC, and the RMSE was reduced from 0.35 to 0.44 range to 0.20–0.25 range.