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Richard Lhotský

The role of historical fishpond systems during recent flood events

Most of the large pond systems in the Czech Republic were built in 16th century. One of the most important fishpond systems is the one of the Třeboň basin (Třeboň fishpond system - TFS). It is situated in South Bohemia in the upper Lužnice watershed, but the whole system also includes the upper watershed in Austria. The system consists of almost 1000 fishponds with a total area of 7 500 ha. Retention capacity of fishponds is estimated to be as big as 50-70 mil. m3, but might be even 110-140 mil. m3 during extreme floods. The situation is then often beyond control and damage occurs, which deteriorates the fishponds' water management function. The largest is Rožmberk fishpond (480 ha), which stored 50-70 mil. m3 during the 2002 flood while its normal volume is about 5.5 mil. m3.

In order to ensure a satisfactory flood retention capacity of fishpond systems, proper maintenance of their technical equipment is necessary and emergency measures for the whole system should be added.

Open access

Robert Kuźmiński, Wojciech Szewczyk, Ignacy Korczyński and Piotr Łakomy

Abstract

This study examines the effect of flood on oak stands in the Wołów Forest Division by assessing the loss of leaf area due to insect feeding as determined in laboratory analyses of samples collected from standing trees. We compared stands, in which water stagnated for at least one month and stands with no water stagnation. It was found that the mean damage to the carbon assimilating organs of stands with stagnating water was lowered by approximately 6% compared to stands that were not affected by flood. Thus, no definite effect of flood contributing to losses of carbon assimilating organs in oak trees could be shown.

Open access

Z. Kledyński, P. Falaciński, A. Machowska, J. Dyczek and Ł. Kotwica

test specimens. 5. EN 450-1: Fly ash for concrete. Definition, specifications and conformity criteria. 6. EU Floods Directive 2007/60/EC on the assessment and management of flood risks entered into force on 6th November 2007. 7. J. Evans, A. Dawson, S. Opdyke, “Slurry walls for groundwater control: a comparison of UK and US practice”, ASCE/PENNDOT Central PA Geotechnical Conf., 2002. 8. P. Falaciński, Z. Kledyński,.” Influence of aggressive liquids on hydraulic conductivity of hardening slurries with the

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Lucie Grohmanová

Succession and the Development of Alluvial Communities After a Flood in 1997

This paper details a ten-year period in the development of floodplain biotopes after a disastrous flood in 1997 at three sites on along the Spojená Bečva River in the Zlín and Olomouc regions, Czech Republic. Two of the sites are located on gravel bars, whilst the third site is located on a bank characterized as bare bed flysch sediments uncovered after a flood in 1997. After the flood, the previously homogeneous alluvial environment changed into a varied mosaic of biotopes with renewed conditions for the development of willows (Saliceta fragilis inferiora) and stands of Ulmi-fraxineta carpini superiora and Alni glutinosae-saliceta superior. A detailed study of the vegetation at the selected sites was conducted annually from 1998-2002, and in 2008, using 10 m wide transects oriented perpendicular to the river. The obtained data, including phytocoenological records, were compared with the vegetation communities ten years earlier and during the examined time interval. The dependence of particular types of biotopes on site conditions was described.

In total, we identified and located 14 types of biotopes, completed 58 relevés, and found 245 species. The results show that succession is faster at moist sites with fine sediment in Rybáře and slower at drier sites without fine sediment in Lhotka nad Bečvou and Choryně. The flooding of the floodplain forest was not destructive for most species outside the flood channel. Between 2004 and 2006, short-lived and segetal species retreated. The dominant species are Phalaris arundinacea, Urtica dioica, Echium vulgare, and Artemisia vulgaris. Invasive neophytes included Reynoutria japonica, Solidago canadensis, Impatiens glandulifera and Robinia pseudoacacia.

The results obtained through this project can serve as a valuable foundation for decisions regarding nature conservation.

Open access

Milena Kercheva, Zofia Sokołowska, Mieczysław Hajnos, Kamil Skic and Toma Shishkov

. Colloid Interface Sci., 158, 19-26. Orfánus T., Stojkovová D., Nagy V., and Németh T., 2016. Variability of soil water content controlled by evapotranspiration and groundwater-root zone interaction. Archives of Agronomy and Soil Science, doi: 10.1080/03650340.2016.1155700 Ościk J., 1982. Adsorption. Ellis Horwood, Chichester. Saint-Laurent D., Paradis R., Drouin A., and Gervais-Beaulac V., 2016. Impacts of floods on organic carbon concentrations in alluvial soils along hydrological gradients using a Digital Elevation Model (DEM). Water, 8, 208. www

Open access

Karel Nacházel

Problematika Automatického Řízení Nádrží V Povodňových Situacích

Studie uvádí do problematiky operativního řízení nádrží v povodňových situacích a zkoumá možnosti využití počítačů pro automatizaci rozhodovacího procesu. Vychází z moderní teorie řízení dynamických systémů a popisuje základní typy regulátorů. Současně jsou analyzovány meze jejich využití v extrémních situacích. V aplikační části se řeší dopady protipovodňových opatření na transformaci 100-letých syntetic-kých povodňových vln v profilu přehrady Lipno na horní Vltavě a posuzuje se možnost zvětšení jejího ochranného prostoru.

Open access

Chen Minghong, Fang Hongwei, Zheng Yi and He Guojian

. Chaudhry, M.H., 1993. Open Channel Flow. Prentice-Hall, Englewood Cliffs, NJ. Chen, Y.D., McCutcheon, S.C., Carsel, R.F., Donigian, A.S., Cannell, J.R., Craig, J.P., 1995. Validation of HSPF for the water balance simulation of the Upper Grande Ronde Watershed, Oregon, USA. Proceedings of the Boulder Symposium on Man's Influence on Freshwater Ecosystems and Water Use, IAHS Publication, 230, 3-13. Cheng, C.T., Chau, K.W., 2004. Flood control management system for reservoirs. Environmental Modeling & Software, 19(12), 1141

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Viorel Arghiuş, Alexandru Ozunu, Lucrina Ştefănescu, Camelia Costan and Corina Arghiuş

References ANON, 2005. European Flood Report 2005-Central and Eastern Europe. Guy Carpenter & Company Ltd. ANON, 2006. Channel cross-sections at Câmpeni station, 24.09.1980 and 16.03.1981. Câmpeni Hydrological Station. ANON, Alba CCES, 1995-2006. Synthesis reports regarding the emergency response to floods, extreme meteorological phenomena, accidents occurred in hydrotechnical structures and accidental pollutions in Alba county, period 1995-2006. Alba County Committee for

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Katarína Jeneiová, Silvia Kohnová, Julia Hall and Juraj Parajka

REFERENCES Bayliss, A.C., Jones, R.C., 1993. Peaks-over-threshold flood database: Summary statistics and seasonality. IH Report No. 121, 1993. Beurton, S., Thieken, A.H., 2009. Seasonality of floods in Germany. Hydrological Sciences Journal, 54, 1, 62–76. doi: 10.1623/hysj.54.1.62. Black, A.R., Werritty, A., 1997. Seasonality of flooding: A case study of North Britain. Journal of Hydrology, 195, 1–25. Blöschl, G., Nester, T., Komma, J., Parajka, J., Perdigao, R.A.P., 2013. The June 2013 Flood in The Upper Danube Basin, and comparisons with

Open access

Milen Ivanov and Yavor Yankov

References Australian Government, Emergency Management Australia (EMA). Retrieved from: http://www.ema.gov.au/ Bahchevanov, G. et al. (2005). Crisis management operation. Sofia: MA Pres. Buchanan-Smith, M. (2000). Role of Early Warning Systems in Decision Making Processes. Lisbon: Overseas Development Institute. European Commission, (2007). Directive 2007/60/CE for estimation and management of flood risk. Strasburg. Grasso, V. (2012). Early Warning Systems: State-of-Art Analysis