PREDICTION IN FLOOD WATER LEVEL OF RIVER COURSES WITH VEGETATION

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  • 樹木群を有する河道の洪水位予測
  • ジュモクグン オ ユウスル カドウ ノ コウスイイ ヨソク

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Abstract

River courses supply good environment for vegetation growth. Vegetation is an essential element composing river landscape and river environment, but it is also roughness element for making the resistance to flow increase. In this paper, the lateral distribution of depth-averaged velocity is firstly obtained from equations of motion within a cross-section and continuity equation in which we consider the flow resistance in compound cross-section and resistance due to interaction between distributed vegetation and flood stream. Secondly, longitudinal water level is calculated from one-dimensional momentum equation taking account of distributed vegetation and the lateral velocity distribution.<br>The applicability of the basic equations determining velocity distribution and longitudinal water level is assured by two sets of data of large floods in the Ishikari River.

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