The influence of afforestation on Floyd outflows from the Puszcza Zielonka Forest

Antoni T. Miller, Sylwester Grajewski, Anna Krysztofiak-Kaniewska

Abstract


An estimation of the influence of afforestation on flooding was calculated based on the SCS-CN method. The main parameter of this method – CN (Curve Number) is a function e.g. of land use. The parameter combines the properties of land cover and soil, including the antecedent soil moisture conditions preceding the runoff event. Although the model was developed on the basis of rich empirical material collected across the USA, local physiographic conditions determined the final effect. Thus, effective rainfall modeling using the SCS-CN procedure does not often produce acceptable results if the original model version is employed. The paper covers the implementation of an altered and modified SCS-CN procedure, which enables the utilization of the method in forest conditions in Poland. The empirical values of parameter CNemp were calculated based on hydro-meteorological data of flood outflows in two small catchments (with afforestation at 89% and 15%) located in the Puszcza Zielonka Forest. This forest is situated in the middle part of the Warta river basin, in the centre of the Wielkopolska region. The natural landscape is of postglacial type with morainic plateaus – plain or rolling, and gravel and sandy soils as the main features. Pine and oak are the dominant tree species in the forest stands. The dependence between the empirical value of parameter CNemp and its equivalent value from the original CN method is the basic idea of adaptation method SCS-CN to the characteristics of the catchment. It therefore provides the opportunity to predict how a change of land use (e.g. forest stand reconstruction, afforestation, deforestation, change of field culture, a significant change in infrastructure etc.) would influence flood outflows (a change to water retention). Therefore, the values of CNemp indicated how changes of land use were influencing flooding (changing water retention). Conclusions: 1) the adaptation of parameter CN value obtained in the original method to the geographical conditions is relatively simple; 2) the values of parameter CNemp can be the basis of calculating more objective (in relation to different methods) scenarios of land use change to water condition stands; 3) Quasi representation of studied catchments for the Puszcza Zielonka Forest shows empirical values CN on whole area of this forest.


Keywords


SCS-CN procedure, afforested catchments, prognosis of retention changes

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References


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Forestry Letters  eISSN 2450-4920

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