ROLE OF VEGETATION IN VARIABILITY OF WATER REGIMES IN SUMAVA MTS. FORESTS
Buchtele, J., Buchtelová, M., Tesař, M.
Institute of Hydrodynamics, Academy of Sciences of the Czech Republic, Pod Patankou 5, 166 12
Prague 6 - Dejvice, Czech Rep., (Tel.: +420-233-109-026; Fax: +420-233-109-026;
email: buchtele@ih.cas.cz, miroslav.tesar@iol.cz
Deviations between observed and simulated discharge in four basins along the borders of the Czech
Republic with Austria and Germany provides outputs which enable to follow differences in runoff.
Three basins are the catchments with the area between 100–200 km2 and experimental basin Liz with
P = 1 km2. It indicates runoff changes appearing due to damages in forest cover caused by wind
disasters and insects damages.
Daily time series used for simulations are approximately 40years long, in the experimental basin 20
years. Two different models of rainfall – runoff proces have been used for simulations and the outputs
provide comparables results. That are the conceptual model Sacramento (Burnash, 1995) and model
BROOK´ 90 (Federer, 1993). From the second model details concerning evapotranspiration are
provided. It distinguished transpiration, rain and snow interception and snow and soil evaporation.
The indicated runoff changes seem to be rather complex: after deforestation the volume of runoff
generally increases and peak flows of floods are also higher, but low flow in rainless periods show
decreasing tendencies.
LITERATURE
Buchtele, J., Buchtelová, M., Fořtová, M., Herrmann, A. and Tesař, M.: Runoff changes caused by
deforestation: Results of monitoring and simulations. Conf. Problems in fluid mechanics and
hydrology, Prague June 1999, Vol.2, pp. 355–362.
Burnash, R.J.C.: The NWS River Forecast System – Catchment modelling. In: Singh,V.P. (ed.)
Computer Models of Watershed Hydrology. Water Resources Publications, ISBN No. 0-91833491-8, 1995.
Federer, C. A.: BROOK 90 – A Simulation Model for Evapotranspiration. Soil Water and Streamflow.
USDA Forest Service, Durham, New Hampshire, USA, 1993