HYDRAULIC MODEL EXPERIMENTS ON ICE JAM OCCURRENCE CONSIDERING THE EFFECTS OF BRANCH RIVER JUNCTION

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  • 支川合流を考慮したアイスジャム発生に関する実験的研究
  • シセン ゴウリュウ オ コウリョ シタ アイスジャム ハッセイ ニ カンスル ジッケンテキ ケンキュウ

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Abstract

 This study aims to clarify a relationship between the ice jam occurrence and the cross-sectional profile of the ice-covered river. On previous studies using a hydraulic model experiment, we have expressed the ice-jam-scale using the river ice velocity, width, thickness and length, and the river-width-reduction ratio and evaluate the attenuation ratio of the velocity of river ice with ice jam. However, no previous study has taken into account the effects of branch river junction. In this study we carried out hydraulic experiments considering the effects of branch river junction and examined applicability of the ice-jam-scale. Furthermore, we estimated the attenuation ratio of the velocity of river ice using the ice-jam-scale that we found by the two-dimensional non-uniform flow calculation and extracted the potential ice-jam locations with the longitudinal variation of the cross-sectional profile.

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