ABSTRACT: This study based on laboratory experiments for computing depth of local scour around groyne when a different spacing between the groynes using as a countermeasure. This study is conducted using a physical hydraulic model for groyne operated under clear-water condition and using uniform cohesionless sand as bed material. A different types of spacing (1, 1.5, and 2) from length of groynes is investigated with different water depths and flow intensities. It is developed a new formula to calculate a local scour around groynes included many parameter. Also, it has been observed that increasing the distance between the groynes leads to increase the depth of the scour about (20)%. KEY-WORDS: groynes, Local Scour, Deposition. I
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