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The Benowo Weir is designed to supply raw water to support the needs of residents and tourism development within Indonesia’s National Tourism Strategic Areas (KSPN) of Borobudur and Prambanan. Effective hydraulic analysis is essential in the planning process, and the HEC-RAS software is commonly employed for this purpose. However, simulations in HEC-RAS often encounter challenges, including instability and inaccurate results, frequently caused by insufficient cross-section density. This study utilizes unsteady flow modeling and evaluates six alternative geometry configurations with varying cross-section spacings to assess their impact on simulation outcomes. The results indicate that using a 0.5-m cross-section spacing yields the most stable and realistic water surface elevation and flow velocity profiles. These findings highlight the importance of geometric refinement in hydraulic modeling and offer practical insights for improving simulation reliability in weir design.

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The Influence of Cross-section Density in the HEC-RAS Simulation, Case Study of Benowo Weir

  • 会议论文

  • 发表日期：

    2026年

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  • Puji Harsanto,
  • Bayu Krisna Wisnulingga,
  • Sakinul Hafiz

摘要

The Benowo Weir is designed to supply raw water to support the needs of residents and tourism development within Indonesia’s National Tourism Strategic Areas (KSPN) of Borobudur and Prambanan. Effective hydraulic analysis is essential in the planning process, and the HEC-RAS software is commonly employed for this purpose. However, simulations in HEC-RAS often encounter challenges, including instability and inaccurate results, frequently caused by insufficient cross-section density. This study utilizes unsteady flow modeling and evaluates six alternative geometry configurations with varying cross-section spacings to assess their impact on simulation outcomes. The results indicate that using a 0.5-m cross-section spacing yields the most stable and realistic water surface elevation and flow velocity profiles. These findings highlight the importance of geometric refinement in hydraulic modeling and offer practical insights for improving simulation reliability in weir design.