土石流に関する研究-4-流速および衝撃力について

IR Web Site

Bibliographic Information

Other Title
  • 土石流に関する研究 IV : 流速および衝撃力について(林学部門)
  • ドセキリュウ ニ カンスル ケンキュウ 4 リュウソク オヨビ ショウゲキリョク ニ ツイテ
  • Studies on mud-flow IV : On velocity and impact force of mud-flow (Forestry)

Search this article

Description

Authors have investigated on the impact force of mud-flow using experimental flume, through which we have flushed down the fluid of sand and water, and measured the impact force, and according to those meausrement we have studied and found several facts. In the report No. 3,we have investigated the relation between the impact force and the specific weight of the fluid of sand and water. In this report, in order to study the mechanisms of mud-flow, especially on the impact force further more, we have measured the velocity of the fluid more exactly and of cource we have measured the impact force as was done before with the small-sized pressure transducer named "sensor". The results that are investigated are summerized as follows; 1. The results of velocity values that are measured are effected largely by the length L, that is the distance from the point at which the fluid was poured into the flume at the upstream end. 2. There are large difference between the flow of pure water and mud-flow in the measured values of the velocity. This seems according to the difference of the flow pattern of these two flows. 3. The effect of the different grain size distributions on the measured values of the velocity was not so large, but there was a tendency of it. 4. The parameters α which is expressed as the ratio between the impact forces that are measured and the theoretically calculated forces are expressed as exponential functions of the specific weight of the fluid. These functions are expressed as α=a・w^b. a and b are calculated respectively according to the place at which the impact forces are measured. 5. The parameters α have values between 0.11 and 1.22. This is because of the steepness of the flume, so, in calculating the theoretical forces, the second power of the velocity seems to have effected largely to the values of α.

Journal

Details 詳細情報について

Report a problem

Back to top