<abstract xmlns="http://www.w3.org/1999/xhtml">The subject of this study is an evaluation of the amount of evaporation from water surfaces (VVH), measured using EWM devices in two cities of different sizes, and located approximately 80 km from each other – Prague and Pilsen. The results were analyzed in the context of urban phenomena, which are pronounced especially in Prague, and also in the context of meteorological and morphological conditions in those locations. It was found that higher amounts of evaporation were measured at the meteorological station in Pilsen. The difference between the average sum of VVH per season (1st May to 30th September) between 2005 and 2014 for the two locations is 33.3 mm. The difference between daily average values was 0.2 mm. Given the suburban nature of the two locations where measurements were taken, it was not possible to draw any conclusions about the effect of the urban heat island on the rate of evaporation and values of VVH. Factors significantly influencing VVH are surface roughness, which is higher in urban environments than in open landscapes. Based on the results it was concluded that at both a regional and a local scale, the rate of evaporation is more affected by wind speed than thermal conditions. The measured VVH values differ, not just because of the urban dimension of the two cities compared, but especially as a result of different topoclimatic location of the two stations.</abstract>

The subject of this study is an evaluation of the amount of evaporation from water surfaces (VVH), measured using EWM devices in two cities of different sizes, and located approximately 80 km from each other – Prague and Pilsen. The results were analyzed in the context of urban phenomena, which are pronounced especially in Prague, and also in the context of meteorological and morphological conditions in those locations. It was found that higher amounts of evaporation were measured at the meteorological station in Pilsen. The difference between the average sum of VVH per season (1st May to 30th September) between 2005 and 2014 for the two locations is 33.3 mm. The difference between daily average values was 0.2 mm. Given the suburban nature of the two locations where measurements were taken, it was not possible to draw any conclusions about the effect of the urban heat island on the rate of evaporation and values of VVH. Factors significantly influencing VVH are surface roughness, which is higher in urban environments than in open landscapes. Based on the results it was concluded that at both a regional and a local scale, the rate of evaporation is more affected by wind speed than thermal conditions. The measured VVH values differ, not just because of the urban dimension of the two cities compared, but especially as a result of different topoclimatic location of the two stations.

Evaporation from water surfaces in urban environments, using Prague and Pilsen (Czech Republic) as examples

Czech Hydrometeorological Institute, Brno regional office, Kroftova 43, 616 67 Brno,

Environmental & Socio-economic Studies

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

The subject of this study is an evaluation of the amount of evaporation from water surfaces (VVH), measured using EWM devices in two cities of different sizes,...

Evaporation from water surfaces in urban environments, using Prague and Pilsen (Czech Republic) as examples

Pubblicato online: 28 dic 2016

Pagine: 13 - 23

Ricevuto: 22 lug 2016

Accettato: 24 nov 2016

DOI: https://doi.org/10.1515/environ-2016-0020

Parole chiave
urban climate, amount of evaporation, EWM, water balance

© 2016 Gražyna Knozová et al., published by De Gruyter Open

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Evaporation from water surfaces in urban environments, using Prague and Pilsen (Czech Republic) as examples

Pubblicato online: 28 dic 2016

Pagine: 13 - 23

Ricevuto: 22 lug 2016

Accettato: 24 nov 2016

DOI: https://doi.org/10.1515/environ-2016-0020

Parole chiaveurban climate, amount of evaporation, EWM, water balance

© 2016 Gražyna Knozová et al., published by De Gruyter Open

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Parole chiave
urban climate, amount of evaporation, EWM, water balance