Oral Presentation

¹Hassan I. Mohamed; ²Gamal Abozeid; ³Nashat Ali; ⁴Wagdy M. Saied

¹Civil engineering department, Assiut university

²Faculty of engineering, Civil department, Asuuit , Egypt

³Faculty of ENgineering, Civil department, Assuit, Egypt

⁴Faculty of Engineering, Civil Department, Asuit University, Asuit, Egypt

Weirs play an important role in controlling and managing water in irrigation canal networks through several functions such as discharge measurements, water diversion, lowering the water level, and removing excess water at the ends of canals to protect the earthen banks and neighboring lands. Over the previous decades, the flow over the linear sharp-crested weirs was extensively investigated by many researchers; however, the tail-escape weirs have not received sufficient attention. These types of weirs were mostly constructed in the form of vertical wells that may be circular or rectangular in shape, and water may flow through the entire perimeter of the weir or part of the perimeter. In the present research, the effect of the tail escape-weir shape and flow direction on the flow characteristics over the tail escape-weirs were studied numerically and experimentally. For this purpose, a set of models were constructed in different shapes, circular and square, and the entire perimeter of the weir or part of the perimeter is working as the weir crest length. The turbulence model RNG k-ε Ansys Fluent software was used to simulate flow over the tail escape-weir physical models. The verification of the numerical model was based on the profiles of the water surface and the velocity profile above the weir crest, which both showed acceptable agreement. The comparison of the experimental and numerical results for the water head over the weir crest showed acceptable agreement with minimum and maximum absolute percentage errors (0.17% ─ 6.5%) for all models.

Tail escape-weir; Discharge; Flooding; Sharp-crested weirs; Ansys Fluent; Turbulence Model

Water Resources and Environmental Engineering