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1 2006

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Warunki przepływu w rzekach z kieszeniami zalewowymi - badania laboratoryjne

Mazurczyk A.

Przegląd Naukowy Inżynieria i Kształtowanie Środowiska

2006

Vol. 15, No. 1

21--28

Contemporary rules o f controlling rivers suggest leaving vegetation on the floodplains for the sake of its environmental functions. After years of constructing channels with simple geometry and free of obstruction, like floodplain vegetation, the trend to promote restoration of river valleys appeared. Due to the problem s with natural re-shaping of already canalised rivers along their whole lengths, the idea of building of a side-pocket within a shorter reach of a floodplain by shifting the existing dikes further front the main chamtel has appeared. The main aim of the study was the examination of the influence of the occurrence and density of stiff woody vegetation in a floodplain-pocket upon the velocity distributions and flow capacity in a com pound channel in a Iaboratory flume. Vertical and horizontal velocity distributions in a floodplain-pocket and in the main channel and change of water level caused by occurrence of vegetation and the geometry of the pocket by different density of vegetation were investigated. Water flow in the channel with floodplain-pocket is too complicated to be treated like a one-dintensional process. Velocities in the main channel are visibly higher than in the floodplain-pockct. Vegctation reduccs the velocities on the floodplain, but also reduces the effect of geometry of the pocket. The inerease in water stages is observed above and within the pocket. Water stages down the channel remain constant independently of the existence of the pocket and the vegetation.