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

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