Applications of a Tank Model affected by Water Stages in Drainage Canal to Flood Analyses

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  • 排水路水位の影響を考慮した流出・湛水解析手法
  • ハイスイロ スイイ ノ エイキョウ オ コウリョシタ リュウシュツ タンスイ

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Abstract

In the preceding paper, the analyses of runoff in Imizu-Seibu basin showed that the runoff of low land was affected by the water stages in drainage canal.<BR>In other words, it was indicated by making use of the observed data that the rising of the water stages introduced a repression of the runoff in the low land. The experimental equations obtained in Imizu-Seibu basin are as follow:<BR>qt=λht-1<BR>λ=λ0 {1-exp (b (Hi (t)-H0))}<BR>In this paper, the relation of parameter λ to the water stages is discussed by taking the hydraulic orifice into consideration. Finally, it turned out that the equations obtained in Imizu-Seibu basin can be modelled by the submerged orifice accompanied with a control output tank.<BR>Next the equations were applied to the analyses of the runoff of the sub-basins in Imizu-Seibu basins, although these equations were obtained from data concerning the whole basin of Imizu-Seibu. Before the applications of the equations to sub-basins, it was necessary that the dependency of parameters b, H0 on the characteristics of basins was examined. Some qualitative characteristics of the parameters were obtained by simulations related with the basin introduced by simplification of Imizu-Seibu basin. In addition, the equations lose their physical meaning with Hi>H0 in spite of the fact that a branch canal is able to have refluxes in contrast to the main drainage canal. Therefore, it became a problem that the equations are applied directly to each of the sub-basins. For this reason, the equations were applied to the upstream basin of the node located a little downstream from the confluence of main and branch drainage canal. The reflux of the branch canal became possible without losing the physical meaning of the equations by the method described above. The parameters at the nodes were determined on referring to the storm data from June 29 to July 1, '85. The discharges of the branch canals, the water levels in the main canal, the discharges of pumps at the station and the discharges of the drainage gate were obtained from the simulation carried out by using the parameters mentioned above.

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