EXPERIMENTS ON FLOW AROUND A CYLINDER IN A SCOURED CRANNEL BED     

I. ISTIARTO  W.H. GRAF Res. Asst.  Lab. de recherches hydrauliques  Ecole Polytechnique Federale  Lausanne  Switzerland. E-mail: adhy.kurniawan@epfl.ch or istiarto@tsipil.ugm.ac.id Prof  Lab. de recherches hydrauliques  Ecole Polytechnique Federal 《国际泥沙研究》2001,(4)

1 INTRODUCTION'LOcal scour around a pier is a result of the interatiOn amongst the pier, the aPproach flow and theerodible bed. The Presence of a pier results in a stagnation pressure build-up in front of the pier and athree-dimensional tUrbulent flow echaracterized by the downward flow ahead of the pier and the so-called horseshoe vortex along the base of the Pier forms itself The flow modifies the erothe bed inthe vicinity of the pier when local scour takes place (Graf and AJhnakar l…  相似文献