開水路断面急拡部の水理とその適用に関する研究

Abstract

The author studied the hydraulics of the tranquil flow through the cross-sectional ex-pansion in an open channel, and made clear the hydraulic behaviors such as the length of thedead water region due to the discontinuity, the velocity distribution, and the length requiredfor the conversion of kinetic energy to potential energy under various conditions for ex-pansion angle. Moreover, applying the total force theorem involving the frictional forces tothe flow in the channel expansion, the author obtained the form resistance formulas. Withthe use of the above results, the author established the method of hydraulic design for thechannel transition and of calculation for the water surface profile throug the channel ex-pansion with a sufficient accuracy and a pracical convenience, compared with the conventionalprocedures. Finally the applicability of these methods to the practical problems was dis-cussed with some examples.