流下抵抗の研究

概要

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Most of natural Streams have composite sections in which the roughness varies with respect to the low water channel and the flood opening. Therefore we must study the composite roughness and distribution of the velocity of flow through the section of the stream. We found the following results according to the investigation : (1) In the open channel having the composite roughness, Lotter's formula gives the sufficient proper value of the equivalent roughness. (2) The uniform flow resistance formula in the open channel having the composite sections is V=CR^ξI^η where ξ=14.7R^<2/3> and η=1/2 (3) The relationship between roughness factor n and roughness height k is n=0.0184k^<1/6> (4) In the Theoretical velocity formula, V/V_*=6.25+5.75 log R/k The constants are 6.25 and 5.75,but the former and latter are together variable with respect to the roughness and slope of the channel. (5) The relation between roughness composition ratio and velocity distribution coefficient α, β is plotted in Fig. 2,Fig. 13 and Fig. 14. The max. value α, β of occurs when roughness composition ratio is 50%
山梨大学の論文
1965-12-20