Einzelzellbiologie

Abstrakt

Numerical and experimental investigation of the effects of curved sills on scour protection

Muslim Sohrabi*, Alireza Keshavarzi

Scouring of river bed and bank has a great impact on hydraulic structures such as bridges, water intakes and riverine habitats. In this study, experimental and numerical investigations were conducted to compare the effects of three types of sills on the flow structure and scouring pattern and also to understand the performance of the sills. The study found that the eddies generated on the banks transport sediments to the central parts of the channel. It was concluded that concave sills enable the stabilization of the bed in the central part of the channel. Other types of sills such as sinusoidal and vane-shaped were also tested and found to be very effective for stabilizing the bed and banks simultaneously. It was found that the positions of the eddies and the depths of scouring for sinusoidal sills were changed according to their geometric specifications. The distances of the eddies from the bank simultaneously affected the stability of the bed and banks of the channel. Furthermore, the results showed that the maximum and minimum scour depth occurred at the concave and wing bed sills, respectively.