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1 2005

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Wpływ stanu pokrywy roślinnej na odpływy wezbraniowe w zlewniach potoków górskich

Osuch B., Banach W., Gądek W., Homa A., Nahorecka-Duda H.

Czasopismo Techniczne. Środowisko

2005

R. 102, z. 10-Ś

71--85

Retention capabilities were described for different vegetation types. This description was used for evaluation of influence of vegetation retention capabilities on flood run-off formation in Trzebuńka stream catchment. Mathematical model of rainfall run-off transformation WISTOO was used. Based on results of analysis, can be stated that flood waves after forest cutting increase comparing to waves in actual forestation conditions. Those differences are minor for precipitation with p=50%. For smaller probability of high intensities rainfall occurrence, flood peak run-off value is higher. Forest cutting can result in twice or even higher increase of peak run-off. In case of different catchment aforestation (according "vertical" downstream or upstream and "linear" from catchment boundary or in other direction) and different forestation coefficient, the biggest effect for sale water run-off gives afforestation of upper parts of catchment which confirms state-of-the-art.Described in article calculation methods of vegetation influence on flood run-off enable quantitative evaluation of change of flood wave shape in specific catchment conditions and rainfall distribution. Developed methods enable quantitative description of delay and decrease of flood waves depending on forest management practices in catchment. Up to now vegetation was considered affecting run-off by taking part of precipitation and by run-off delay as effect of water retention in vegetation retention reservoir. It was not mentioned however that water retention by plants enables bigger outflow to deeper soil layers eliminating additional amount of water from fast surface and subsurface run-off decreasing this way volume of flood wave.