An experiment of energy dissipation on USBR IV stilling basin – Alternative in modification

Journal of Water and Land Development

article

Alfiansyah Yulianur Bantacut¹  Azmeri Azmeri¹  Faris Zahran Jemi²  Ziana Ziana¹  Muslem Muslem¹ 

[1] Universitas Syiah Kuala, Faculty of Engineering, Civil Engineering Department;Universitas Syiah Kuala, Faculty of Engineering, Electrical Engineering Department

关键词: energy dissipation;    hydraulic jump;    stilling basin;    USBR Type IV;   

DOI  :  10.24425/jwld.2022.140781

学科分类：农业科学（综合）

来源: Instytut Technologiczno-Przyrodniczego / Institute of Technology and Life Sciences

【 摘 要 】

Previous researchers have been widely studied the equation for calculating the energy dissipation in USBR Type IV, applied in the stilling basin structure as an energy dissipator. However, inefficient energy dissipating basins are commonly found in the field due to the large discharge and high water head, potentially damaging the bottom of the energy dissipating basin and its downstream river. Therefore, an energy dissipator plan fulfilling the safe specifications for the flow behaviour that occurred is required. This study aimed to determine the variation of the energy dissipators and evaluate their effect on the hydraulic jump and energy dissipation. For this purpose, a physical model was undertaken on the USBR Type IV spillway system. The novelty of this experiment showed that combination and modification dissipation features, such as floor elevation, end threshold and riprap lengthening, could effectively dissipate the impact of energy downstream. The final series exhibited a significantly higher Lj/y1 ratio, a favourable condition due to the compaction of the hydraulic jump. There was also a significant increase in the downstream tailwater depth (y2) during the jump formation. Therefore, the final series energy dissipator was better in the stilling basin design for hydraulic jump stability and compaction. The increase in energy dissipation for the final series type was the highest (98.4%) in Q2 and the lowest (84.8%) in Q10 compared to the original series. Therefore, this type can better reduce the cavitation risk damaging to the structure and downstream of the river.

【 授权许可】

Unknown