非構造格子を用いた有限体積法に基づく1次および2次精度平面2次元洪水流数値モデル  [in Japanese] FIRST- AND SECOND-ORDER ACCURATE 2D NUMERICAL MODEL BASED ON UNSTRUCTURED FINITE-VOLUME METHOD FOR FLOOD FLOWS  [in Japanese]

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Abstract

洪水氾濫シミュレーションモデルの基礎モデルとして, 非構造格子を用いた有限体積法 (FVM) と流束差分離法 (FDS) に基づく1次および2次精度平面2次元洪水流数値モデルを提案した. 道路や水路に集中する洪水流を想定した Bellos et al. による漸縮・漸拡水路内の2次元ダム破壊流れ, および本研究で新たに得られた破堤点から氾濫原に広がる洪水流を想定した2次元ダム破壊流れの水深, さらにはフロントの広がりおよび水深平均流速の実験結果に基づき, 両数値モデルの予測精度と適用限界などの検討を行った. その結果, 計算精度と計算効率を勘案すると, 1次精度モデルが実用的な数値モデルであることがわかった.

First-and second-order accurate 2D numerical models based on finite-volume method for flood flows are developed. The models employ unstructured grids so as to handle a complicated floodplain geometries. The first-order accurate model uses FDS technique. The second-order accuracy, in space and time, is obtained by using MUSCL technique and predictor-corrector time integral sequence in the first-order model. The models are verified against experimental data of dam-break flow in converging-diverging channel as well as 2D flood wave due to partial dam-break under dry-bed condition. The first-order accurate model may be preferred for practical applications when computation time and overall accuracy are considered.

Journal

  • Doboku Gakkai Ronbunshu

    Doboku Gakkai Ronbunshu 705, 31-43, 2002-05-21

    Japan Society of Civil Engineers

References:  23

Cited by:  3

Codes

  • NII Article ID (NAID)
    10008534974
  • NII NACSIS-CAT ID (NCID)
    AN10014020
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    02897806
  • NDL Article ID
    6177915
  • NDL Source Classification
    ZN1(科学技術--建設工学・建設業)
  • NDL Call No.
    Z16-6
  • Data Source
    CJP  CJPref  NDL  J-STAGE 
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