0196153 - UH-J 20013076 RIV NA eng C - Conference Paper (international conference)
Tesař, Miroslav - Eliáš, Václav - Fottová, D. - Fišák, Jaroslav
Hydrological and ecological importance of the occult precipitation and its site-to-site variation in the Czech Republic.
4th Biennial Congress of the African Division of the International Association of hydraulic Engineering and Research. Namíbie: IAHRAIRH, 2000, s. 1-10.
[Biennial Congress of the African Division of the International Association of hydraulic Engineering and Research /4./. Windhoek, Namibia (NA), 07.06.2000-09.06.2000]
Institutional research plan: CEZ:AV0Z2060917
Keywords : occult precipitation * cloud and fog droplet deposition * air pollution
Subject RIV: DA - Hydrology ; Limnology

The objectives of this article are to: (1) estimate the amount of fog and cloud water; (2) characterise the chemical composition of fog and cloud water in the forested mountainous areas and in urban areas of the big cities of the Czech Republic; and (3) determine if site-to-site differences exist. Fog deposition rates is calculated with the use of the Lovett's mathematical micrometeorological model for the selected mountainous locality and estimated on the basis of these calculations for the other localities. Estimated gross deposition of cloud water is about 8 % of the total annual precipitation in the mountainous regions of the Czech Republic. Samples of cloud water obtained with the aid of the both active and passive collectors were analysed for major ions. Together five active fog-water collectors and five passive fog-water collectors were installed in various suitably chosen parts of the Czech Republic with different pollutants loads in order to evaluate if site-to-site differences exist. A wide range of concentrations were encountered, most typically exceeding concentrations occurring in rain by factor from 2 to 17 in the Sumava Mts. (the cleanest part of the Czech Republic), from 7 to 74 in the Krusne hory Mts. (a heavy polluted region of the Czech Republic) and from 9 to 50 in Prague (capital of the Czech Republic).
Permanent Link: http://hdl.handle.net/11104/0091796