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Natural flooding in Lužnice floodplain - an holistic approach
Pithart, David ; Montagová, Martina ; Hartvich, P. ; Černý, R. ; Prach, K.
Natural flooding was analysed in the Lužnice River floodplain in a holistic approach. Benefits of natural flooding can be summarised as folows: 1. Water retention is increased due to the soil absorption, evapotranspiration, filling of oxbows, pools and natural depressions and finally the space between the river terreces. Real flood event are analysed here in terms of water distribution among these processes. 2. Natural flooding reduces the loss of ionts from the watershed by flowing the river outflouw and loss of carbon loss by slowing the decomposition processes. 3. Flooding creates and maintains floodplain geobiodiversity by re-forming of floodplain subsystems and differentation of its impact on these subsystems. For these reasons, maintaining and enchenging of natural flooding seems to be a prerequisite of sustainable management of riverine landscape.
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The effect of a high through-flow on the plankton of the reservoir Slapy?
Hrbáček, Jaroslav
In August 2003 an extraordinary intensive trough-flow has replaced the volume of water in the Slapy Reservoir in few days. Immediately a decrease of the transparency pH, frequency of planktonic crustaceans and an increase. In comparison with the previous years in the weeks following the flood an unusual increase of the frequency of blue greens mainly Microcystis and the diatoms Melosira a decrease of the diatom Fragillaria, and desmid Staurastrum was observed. As a possible cause decrease of pH and increase of total phosphorus has to be considered. As a possible cause of the decrease of the cladoceran Diaphanosoma and increase of species of Daphnia and Bosmina either the decrease of predation pressure by the export of fry due to the flood or the increase of food basis due to more intensive development of phytoplankton has to be considered. The effect of an exceptionally high through-flow on plankton is far from a dramatic one.
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Natural flooding in Lužnice floodplain - a holistics approach
Pithart, David ; Montagová, Martina ; Hartvich, P. ; Černý, R. ; Prach, K.
Natural flooding was analysed in the Lužnice River floodplain in a holistic approach. Benefits of natural floooding can be summarised as folows: 1.Water retention is increased due to the soil absorption, evaporation, evapotranspiration, filling of oxbows, pools and natural depressions and finally the space between the river terraces. Real flood event are analysed here in terms of water distribution among these processes. 2. Natural flooding reduces the loss of ionts from the watershed by slowing the river outflow and loss of carbon loss by slowing the decomposition processes. 3. Flooding creates and maintains floodplain geodiversity by re-forming of floodplain geomorphology and keps its biodiversity by inoculation of biota into the floodplain subsystems and differentation of its impact on these subsystems. For these reasons, maintaining and enhancing of natural flooding seems to be a prerequisite of sustainable management of riverine landscape.
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