ASSESSMENT OF FLOOD RUNOFF CHANGES UNDER LAND COVER IMPACT USING SCS-CN MODEL AND GIS TECHNIQUES. CASE STUDY: THE BYC RIVER BASIN, MOLDOVA
Jeleapov Ana1
1 Institute of Ecology and Geography of Academy of Sciences of
Moldova, Laboratory of Landscape Ecology, Moldova, e-mail
anajeleapov@gmail.com
Abstract: Present study is dedicated to impact assessment of land cover and
soil moisture changes on flood runoff generation on example of the Byc river
basin. SCS-CN model and GIS were used as main methods and techniques for
runoff change estimation. Rainfall - main factor for flood generation - was
taken as for a storm event over the basin of 1% probability. It was found that
changes in land cover for last 30 years do not have great impact on flood runoff
at basin level. However, locally, there can be observed significant increase and
decrease of flood runoff due to modification of land use. A great impact on
flood runoff is caused by antecedent soil moisture conditions. Thus, average
decreasing of flood runoff due to a dry soil is 40% and average increasing due
to wet soil can be up to 60%.
Key-Words: flood runoff, land cover impact, SCS-CN model, the Byc river
basin
© Academia Romana - Filiala Cluj Colectivul de Geografie
Design by Bilasco Stefan