Sustainable landscape management involve also water reservoir management. The demand of their reconstruction represents a good opportunity for redesigning hydrotechnical structures and their parameters using recent methods and models. The estimation of wind-driven waves on small water reservoirs and their effects on water reservoir structures rarely are applied, although it is an important part of the dam height calculation. The analysis of wave run-up on the upstream face of the dam was performed by means of the Slovak Technical Standard (STN), Coastal Engineering Manual (CEM), Shore Protection Manual (SPM) and model designed by American Society of Agricultural and Biological Engineers (ASABE). The estimations of the wave characteristics differ depending on the model; wave height (H13%) within the range 0.32–0.56 m, wave period 1.32–2.11 s and run-up (R2%) 0.84–1.68 m under conditions of design wind speed 25 m·s−1. Results obtained by CEM, SPM models predict lower values than STN and ASABE models. Since the height difference between the dam crest and still water level in the reservoir is only 0.90 m, we can expect overtopping of the crest by waves after the critical wind speed is exceeded.

Pelikán P., Koutný L.: (2016): Hindcast of wind driven wave heights in water reservoirs. Soil & Water Res., 11: 205−211.The paper is focused on the problems of water level motion in water reservoirs. Dimensions of wind driven waves are closely related to the parameters of occurring wind. Due to the complexity of the physical phenomena, most methods for wave prediction are based on semi-empirical relations. The theories for approximation of waves follow two approaches. The first one, called regular waves, is based on mathematical description of water surface. The second one, called irregular waves, results from statistical processing of collected data. The methods have been modified as wind and wave data were accumulated over time, resulting in better predictions. The aim of the present research consists in verification of two selected irregular wave models for characteristic wave height estimation -the first one widely used by U.S. Army Corps of Engineers (USACE) for sea and large inland water bodies conditions and the second one related to the Czech standard specification CSN 75 0255 Calculation of wave effects on hydraulic structures. Characteristic wave height represents one of the most important wave parameters as an input for consequent computational tasks dealing with hydrodynamic events occurring on the point of interaction between water level and shore (wave breaking, wave setup, wave run-up on structures and banks, etc.). Further, the paper discusses relevant statistical techniques for proper exploration of special data of wave motion gained from in situ measurements.

PELIKÁN PETR, MARKOVÁ JANA: Wind eff ect on water surface of water reservoirs. Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis, 2013, LXI, No. 6, pp. 1823-1828 The primary research of wind-water interactions was focused on coastal areas along the shores of world oceans and seas because a basic understanding of coastal meteorology is an important component in coastal and off shore design and planning. Over time the research showed the most important meteorological consideration relates to the dominant role of winds in wave generation. The rapid growth of building-up of dams in 20 th century caused spreading of the water wave mechanics research to the inland water bodies. The attention was paid to the infl uence of waterwork on its vicinity, wave regime respectively, due to the shoreline deterioration, predominantly caused by wind waves. Consequently the similar principles of water wave mechanics are considered in conditions of water reservoirs. The paper deals with the fundamental factors associated with initial wind-water interactions resulting in the wave origination and growth. The aim of the paper is thepresentation of utilization of piece of knowledge from a part of sea hydrodynamics and new approach in its application in the conditions of inland water bodies with respect to actual state of the art. The authors compared foreign and national approach to the solved problems and worked out graphical interpretation and overview of related wind-water interaction factors. meteorology, water wave mechanics, wind-water interactions The initial driving mechanisms for atmospheric motions are related either directly or indirectly to solar heating and the rotation of the earth. Vertical motions are typically driven by instabilities created by direct surface heating (e.g. air mass thunderstorms and land-sea breeze circulations), by advection of air into a region of diff erent ambient air density, by topographic eff ects, or by compensatory motions related to mass conservation. Horizontal motions tend to be driven by gradients in nearsurface air densities created by diff erential heating and by compensatory motions related to conservation of mass.The waving on water reservoirs was investigated by many scientists since the dams have started to be built (e.g. Braslavskij, 1952;Saville, 1954; Kratochvil, 1970). They observed waves on inland water bodies during various conditions and they published the results which had the scientifi c impact into these days in the region of Czech Republic and Slovakia (Kálal, 1955; Kratochvil, 1970;Lukáč, 1972;Marhoun, 1988;Šlezingr, 2004). MATERIALS AND METHODSDue to the complexity of the physical phenomena, most methods for wave prediction are based on semi-empirical relations. The methods have been modifi ed as wind and wave data were accumulated over time, resulting in better predictions.The energy transferred to the water level by wind generates a range of wave heights and periods that increase as the waves travel across the available fetch length. Fetch ...

PELIKÁN, P., ŠLEZINGR, M.: Methodology for the establishment of physical and geometric properties of a drainage basin. Acta univ. agric. et silvic. Mendel. Brun., 2011, LIX, No. 6, pp. 265-270 Factors which aff ect runoff are closely related to properties of the basin from which the water fl ows and its environment. They have an eff ect not only on the size of the runoff but also its origination and mainly its temporal distribution. These factors can be divided into two main groups. The fi rst group contains climatic factors, which are besides precipitation meteorological quantities aff ecting the overall evaporation of water in the drainage basin. These include the actual temporal and spatial progress of a rainfall, the moisture of air, evaporation, air temperature, the velocity and direction of wind, atmospheric pressure, etc. The other group consists of geographic factors of the drainage basin, which describe the environment in which the process of runoff occurs. The presented study focuses on a theoretical analysis of physical and geometric properties of a basin, the practical methods and the possible ways of their determination and possible uses of results. In the past the determination of physical a geometric watershed attributes had been working out on the basis of analogue maps. These methods were very labour-intensive and lengthy. The report deals with new determination methods based on digital data processing -utilization of digital terrain model (DTM). These problems are quite actual because of research of rainfall-runoff process, fl ood process and soil erosion within watershed. digital terrain model, drainage basin, hydrology, physical and geometric factors, rainfall-runoff process Hydrology is a science which consistently deals with natural principles of water and its cycle. Its signifi cance follows from the irreplaceable character of water for all living creatures, for life and activities of human beings. The knowledge obtained within the fi eld concerning water sources, the origination and distribution of drainage of water on and under the earth surface can be used to enhance the living conditions on the Earth. Hydrological data, which include important characteristics of the hydrological regime, serve mainly as a foundation for proposals of economical and functional water management works and for planning of potential water management interferences improving the hydrological situation.The need for and the consumption of water is still rising. However, with respect to its limited volume, it is necessary to plan the needs of a society so that water resources for various purposes are used rationally and in the optimum way. The general controlling and concept-making role is in the hands of water management. Its activity is practically impossible without good and reliable hydrological data.Engineering hydrology provides data and information necessary for design and construction activities and the operation and maintenance of water management works. Besides, it is used in all activities ai...

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