Abstract
The performance of vertical triple plates as a new countermeasure in control of local scour around a cylindrical model pier is studied. Two ones of the plates are attached to the side wall one of the pier at one pier diameter distance, extending toward upstream distance and the third one is located in the middle, attached to the pier nose. All the three plates are parallel to flow direction. Experiments are conducted for five different depths of flow and two different lengths of the lateral plates, namely 8 and 14 cm. all the runs are performed under the clear water flow over uniform sediment. The results showed a maximum efficiency of 76% in scour reduction for 8 cm long side plates and 85% for 14 cm long ones.it is also found that the proposed setup act simultaneously as both the bed armoring and flow altering countermeasure.
Highlights
Bridges are obviously vital elements in transportation
Installation of piers across rivers alters the local flow field, which is usually accompanied by a sediment- carrying capacity that generally leads to formation of scour holes around the pier
As seen by increasing the inflow discharge or depth of flow, scour holes become deeper, the maximum scour depth occurs at the vicinity of the pier nose
Summary
Bridges are obviously vital elements in transportation. Their function during flood phenomenon is important. Installation of piers across rivers alters the local flow field, which is usually accompanied by a sediment- carrying capacity that generally leads to formation of scour holes around the pier. In a study published by the federal highway administration (FWHA) it is expressed that among 383 bridges failure caused by floods, 25 percent involved pier damage and 75 percent involved abutment damage. Study on the control and prevention of scour hole around bridge pier is an important step in bridge design. There are two major countermeasure techniques available for the control of scour hole size at bridge piers, known as: (1) bed armoring countermeasure; known as direct method. (2) Flow altering countermeasure or indirect method There are two major countermeasure techniques available for the control of scour hole size at bridge piers, known as: (1) bed armoring countermeasure; known as direct method. (2) Flow altering countermeasure or indirect method
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