National Repository of Grey Literature 743 records found  beginprevious734 - 743  jump to record: Search took 0.01 seconds. 
Proces diverzifikace chemismu a fytoplanktonu tůní po povodni
Pithart, David
Seven floodplain pools were observed for water chemistry and phytoplankton development in the time of the end of flooding period. After the disconnection from the river stream, pools repidly developed into a heterogeneous file of water bodies in terms of oxygen concentration, chlorophyll a concentration and phytoplankton composition. Morphology, exposition to flooding, exposition to shading vegetation and different source of water inflow were found to be a key factors of this diversification.
Study of stagnant water occurrences and dripping waters in caves: Chemical composition and remarks to corrosion of dripstones
Zeman, Ondřej ; Bruthans, J. ; Filippi, Michal ; Vysoká, H.
Slight stagnant water occurrences (drops) were studied in four caves in the Czech Republic and Slovakia. Major components were analyzed (Na+, K+, Ca2+, Mg2+, SO42-, Cl-, NO3-), pH, conductivity and temperature were measured in the field. Results are shown in table 1. Waters coming from condensation differs by higher amount of sulphate and some other components if compared with dripping waters.
Environmental tracers (18O, 3H, CFCs, SF6) exploitation for study of mean residence time and flow pattern of dripping water and karst springs (Moravian Karst)
Bruthans, J. ; Zeman, Ondřej ; Jež, M. ; Himmel, J. ; Buzek, F. ; Melková, J. ; Oster, H. ; Geršl, M.
Mean residence time and flow pattern was studied in unsaturated zone of Ochoz Cave in southern part of Moravian Karst by means of 18O in the years 2001 to 2003. The results of study showed relatively long residence time in the unsaturated zone (about 50% komponent with residence time exceeding one year). The proportion components coming from different reservoirs were computed from two components (soil/epikarst; meltwater). The results clearly indicate, that more than 50% of water (nearly 100% in 2003) in dripping waters was derived from soil/epikarst water, which originate from (late) summer precipitations (heavy 18O content)! It means that infiltrating snowmelt water was expelling (by piston flow effect) the summer water from soil and/or epikarst. Water from snowmelt was then lost by evapotranspiration in summer time. If this effect is common in Langer period, it can change composition of d18O in dripping waters and hence also in dripstones precipitating from these waters.
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.
Water Framework Directive implementation in the Czech Republic - the purposes and impacts
Lechnerová, Galina ; Slavíková, Lenka (advisor) ; Hadrabová, Alena (referee)
This work focuses on the question of water as a public good and presents three significant approaches of environmental good treatment (considering water). Those are the environmental policy of a state, market approach and decentralized resource regimes. After that it focuses on the water policy in the Czech Republic and on the temporary Water Framework Directive implementation process. It compares the intended impacts with real effects of the implementation of directive. The comparison is made in three institutional areas -- competent authority, public participation and price policy in management of water. On behalf of the confrontation of institutional changes of these areas, it makes conclusions about real impacts of the Water Framework Directive implementation in the Czech Republic.
Global ecological problem
Klusáková, Michaela ; Jeníček, Vladimír (advisor) ; Vondrušková, Barbora (referee)
This work deals with global ecological problem, mainly with one special part -- water resources problem -- and tries to suggest possible solutions of an overall scarcity of usable water. The first part characterizes a global ecological problem. Next chapter describes a present state of water resources, which are divided into surface water, ground water and desalinated water. The third chapter introduces causes of water scarcity. The fourth chapter deals with water wars and with places threatened by conflict because of water crisis. And the last part of this work suggests possible solutions of a global scarcity of usable water.

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