关键词: 水力学, 弯道水流, 床面切应力

Abstract: The?bed?shear?stress?in?bend?flow?is?the?direct?motivation?for?sediment?initiation,?which?is?an?important?issue?for?hydraulic?engineers?to?concern?about.?A?generalized?curved?conduit?flow?experiment?is?employed?to?systematically?study?the?flow?characteristics?and?the?kinematical?law.?The?3D?flow?velocity?parameters?are?measured?by?adopting?the?ADV?（?Acoustic?Doppler?Velocimeter）.?Based?on?the?proposed?calculation?methods?of?water?surface?transverse?gradient,?longitudinal?gradient?in?curved?flow?and?depth?averaged?longitudinal?velocity?distribution,?a?set?of?formulas?to?compute?the?bed?shear?stress?in?bend?flow?are?theoretically?established.?Then?each?different?parameter?affecting?the?bed?shear?tress?is?calculated?independently?and?in?detail?to?obtain?the?distribution?pattern?of?the?bed?shear?stress.?Results?show?that?the?research?achievements?are?in?accordance?with?the?predecessors＇?findings?basically.?However,?it?is?relatively?more?systematical?and?ideal,?which?can?be?taken?as?the?basis?to?explore?the?hydraulic?characteristics?profoundly.

Key words: hydraulics , curved conduit flow , bed shear stress