10 急水路の流速に就て

概要

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It is an important work method in the erosion control to prepare the channel, but none of the formulas of velocity of water current which has been known up to date are available for the plan of the steep open channel.We, therefore, measured the velocities of water in many open channel made of concrete at various places of southern Kyushyu.If we apply the Bernoulli's theorem between the upper and lower points of the channel, then we have V^2_2=V^2_1+2gh-2gh'.The value of h' (friction head) calculated from the value of measurements is written h'=K(V_1+V_2)^2)/(4R)h, where R is hydraulic mean depth, then we have the value of coefficient K.If we put K(2g)/(4R)K, then the velocity V_2 when the water current flowing in the velocity V_1 in a given point passed through the vertical height h of the steep open channel can be obtained by the formula V_2=(√<V^2_1+2gh(1+K'h)>-K'hV_1)/(1+K'h) The value of K' obtained form the present measurement is not sufficient to draw the conclusion as shown in the preceeding table, and we intend to study it more critically in the near future.
一般社団法人日本森林学会の論文
1952-02-25