PEMODELAN NUMERIK 3-DIMENSI ALIRAN PADA SALURAN TERBUKA MELEWATI STRUKTUR BOTTOM INTAKE

Abstract

Bottom intake is a simple structure which is consist of a channel on the river bottom vertical to the river flow and a screen on top of the channel. Kamanbedast and Bejestan (2008) was conducted the research to know the optimum intake slope by using physical model. The optimum intake slope was taken by the ratio of discharge entering the intake to the discharge fromupstream. Based on 4 slope variation (10, 20, 30 and 40%), it is obtained the optimum slope at 30%. Considering the limitation of bottom intake slope variation, it is possible that the optimum slope occurs at the range between 20 to 30%or 30 to 40%. The present research uses 3-dimensional numerical model by the support of Flow3D programming package. The simulation was conducted at various slope with the accuracy of 1%. The result shows the optimum slope at 28% with the discarge ratio as 28,3%