Wind effect on water surface of water reservoirs

Abstract

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 ...

Spectral analysis of oscillatory wind wave parameters in fetch-limited deep-water conditions at a small reservoir and their prediction: Case Study of the Hulín Reservoir in the Czech Republic

“…When certain conditions are met, it can be assumed that the relationships between wave parameters can still be sufficiently plausibly described by linear wave propagation theory. In the last decade in the Czech Republic, numerous types of research have been performed on closed reservoirs, and draft protective measures have been applied to banks (Kotaška, 2019;Pelikán and Marková, 2013;Pelikán and Šlezingr, 2015;Pelikán and Koutný, 2016;Říha and Špano, 2012;Špano, 2019;Špano and Duchan, 2021;Špano et al 2022).…”

Wind-Wave Interaction in Sengguruh Reservoir and The Effect to Riprap Material

“…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 offshore design and planning [2]. On other hand, dams and reservoirs play an important role in the control and management of water resources.…”

“…Base on that, similar principles of water wave mechanics are considered in conditions of water reservoirs [2]. The energy transferred to the water surface by wind generates a range of wave heights and periods that increase as the waves travel across the available fetch length [4].…”

Investigating the Influence of Meteorological Parameters on the Accuracy of Sea-Level Prediction Models in Sabah, Malaysia

“…The main local effect caused by the presence of land in the coastal zone is the orographic effect. Orographic effects are the deflection, channeling, or blocking of air flow by landforms such as mountains, cliffs, and high islands [14]. Wind forcing is one of the complex outcomes of many environmental factors that contribute to the variation in sea levels [15].…”