Effects of natural cut-off meanders and revitalization channels on the moisture regime of a floodplain forest
2011
Prax, A. | Hybler, V. | Štibinger, J. | Kloupar, M.
Areas created by the alluvial sediments of the Morava and Dyje rivers are of a specific microrelief interwoven sporadically by the rich network of natural cut-off meanders (so called "smuhy") or artificial channels developed in the past or at present. Under original natural conditions of a nearly regularly flooded alluvial plain they served for the faster runoff of inundation waters to the river channels. After water-management measures carried out in the 70s of the 20th century, much of the cut-off meanders, silted cut-off lakes and artificial channels lost water totally or during part of the year. Thus, only a revitalization system established at the beginning of the 90s brought their re-filling. Problems of a new "irrigation" function of the revitalization system were studied in the complex of the Kančí obora floodplain forest at Forest District Valtice, Forest Enterprise Židlochovice. In principle, it refers to inter-relationships and effects of the groundwater level dynamics depending on the flow of water in water bodies and water freely running through channels. Hydrogeological conditions of Quaternary sediments in alluvia of rivers with virtually regular annual dynamics of the groundwater level are of fundamental importance. Permeability conditions of soil profiles of largely heavy-textured Fluvisols with relatively favourable physical conditions are also important. The different hydraulic conductivity of the bed and slopes of channels are of fundamental role at assessing the function of a revitalisation system.
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