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1991 Fiscal Year Final Research Report Summary

Evaluation of the disaster prevention function of channel works in mountainous river.

Research Project

Project/Area Number 02452202
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field Hydraulic engineering
Research InstitutionGifu University

Principal Investigator

KOMURA Saburo  Gifu Univ., Dept. of Civil Eng., Professor., 工学部, 教授 (40021571)

Co-Investigator(Kenkyū-buntansha) NAKATANI Tsuyoshi  Gifu Univ., Dept. of Civil Eng., Asst., 工学部, 助手 (70155753)
FUJITA Ichiro  Gifu Unvi., Dept. of Civil Eng., Associate Prof., 工学部, 助教授 (10127392)
Project Period (FY) 1990 – 1991
KeywordsMountainous River / Channel Works / Groundsill Works / Confluence / Hydraulic Jump / Shock Wave / Bed Variations / Finite Difference Method
Research Abstract

(1) Evaluation of the hydraulic characteristics and disaster prevention function of channel words
A numerical method was developed by means of Two-step Lax-Wendroff method and MacCormack method to compute a water-surface accompanying hydraulic jumps and shock waves. The MacCormack method was successfully applied to simulate the water-surface profiles in a channel with groundsill works. The hydraulic jump at the sudden change of slop was computed without a numerical occilation by the TVD MacCormack method. TVD-MacCormack scheme was expanded to the two-dimensional flow and it was able to calculate the flow at a confluence having subcritical and supercritical flows at the same time.
(2) Evaluation of the hydraulic characteristics and disaster prevention function at a confluence
Unsteady characteristics of a large scale vortex behavior downstream from the right-angled confluence was simulated by LES (large eddy simulation) model. In the case of steady state, it was found out that the size of the separation bubble was underestimated by a standard k-a model. Mean and turbulent flow fields and the size of a recirculating region were obtained by the image processing. The conditions for creation of hydraulic jump at the confluence was also studied by a physical model tests.
(3) Hydraulec characteristics on the sedimentation and disaster prevention function at the bend of the channel
A numerical method to compute the water-surface and river-bed variation downstream of groundsill works was presented by the TVD-MacCormack scheme. Experimental research was mainly placed on the hydraulic characteristics of the local scour in the downstream region of the consolidation dam installed at the bend part of the channel. The empical equation for estimating the maximum scour depth in the downstream of consolidation dam was developed for the straight channel. It was found out that the characteristics of local scour was affected by the shape of the levee crown of consolidation dam.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] 河村 三郎: "SGSモデルによる直角合流部流れの数値シミュレ-ション" 可視化情報. 11. 43-46 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 藤田 一郎: "二次元合流部における大規模剥離渦の特性" 第23回乱流シンポジウム講演論文集. 440-444 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 藤田 一郎: "粒子画像のシミュレ-ションによる相関法の精度と精度向上に関する研究" 可視化情報. 11. 173-176 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 河村 三郎: "TVDーMacCormack法による水面形計算" 土木学会第46回年次学術講演会講演概要集. 2. 468-469 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 河村 三郎: "跳水を伴う流れの一次元河床変動計算" 土木学会第46回年次学術講演会講演概要集. 2. 632-633 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 藤田 一郎: "射流合流に関する実験的研究" 自然災害科学中部地区シンポジウム講演要旨集. 38-39 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Komura, S.,: "A numerical simulation of water-surface at the right-angle confluence by SGS model." Jour. of the Visualization Society of Japan,. 11, Suppl, No. 1. 43-46 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Fujita, I.,: "Characteristics of large-scale separated eddies at a two-dimensional confluence." Proc. of 23th Symposium on Turbulene Flow. 440-444 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Fujita, I.: "Accuracy and improvement of the correlation method by the simulated particle image." Jour. of the Visualization Society of Japan,. 11, Suppl, No. 1. 173-176 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Komura, S: "The water-surface computation by the TVD-MacCormack method." Proc. of Annual Conf. of JSCE,. 2. 468-469 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Komura, S.,: "One- dimensional computation of the river-bed variation with hydraulic jump." Proc. of Annual Conf. of JSCE,. 2. 632-633 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Fujita, I.,: "Experimental study on the supercritical flow at confluence." Proc. of Annual Conf. of Natural Disaster and Science, Chubu District. 38-39 (1991)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1993-03-16  

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