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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Retention capacity of flood plain and alternative flood protection in the Berounka River catchment.
 Pergl, Michal ; Matoušková, Milada (advisor) ; Šípek, Václav (referee)
This thesis deals with the retention capacity of Berounka during the hydrological extremes. Flood prevention and flood condition are main subjects of this thesis. Two selected river areas of Berounka are analysed by the passive retention volume and by the transformation of the flood wave. The first area is situated on the lower course of Berounka near the Černošice, and this area is significantly anthropogenically influenced. The second area which has nature character is located on the middle course of Berounka near Křivoklát. This thesis contains an evaluation of the hydromorphological state of flow in both areas. The results of passive retention indicate negligible influence of the flood situations. 1D hydraulic model HEC-RAS displays the transformation of the flood wave. The results of the transformation are flow velocity and depths of the river valley in 100-year-old and 20-year-old flows. The transformation of the flood wave in the first area is on the minimum level and did not reach its potential retention capability. The culmination flow in the second area is reduced because of a geomorphological shape of the river. Moreover, the near natural flood protection precautions are proposed in this thesis. Mean flow velocity in 100-year floods could be reduced by 1 - 1,6 m.s-1 by forestation of...
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Near natural flood protection measures in the landscape
 Pergl, Michal ; Matoušková, Milada (advisor) ; Kujanová, Kateřina (referee)
Floods are dangerous natural phenomenon that can threaten human lives and cause damage to property. Near natural flood protection and water retention in the landscape is an appropriate combination of flood protection and improvement of the ecological value of the area. The most used near natural measures have been tested in practice by meta-analysis of articles available in electronic and printed form and through case studies. The case study focuses on the creation of an appropriate near natural flood protection measures in the middle part of the river basin of Berounka in the CHKO Křivoklátsko. The main finding of the meta-analysis is a substantial alteration of the height of the flood wave and the flow rate by natural measures for small and medium-sized floods and minimal at extreme hundred-year floods. Case study identifies areas supporting natural retention in the floodplain of the river Berounka. Retention area in the CHKO Křivoklátsko could have a positive influence on the effects of small and flash floods in the lower part of the river Berounka. Near natural flood protection measures in the Czech Republic are currently only at the beginning to become promoted. In the future, it could play an important role not only in terms of protection against floods, but even against the drought.
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