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ŠUMARSKI LIST 11-12/2017 str. 25     <-- 25 -->        PDF

USING GEOWEPP MODEL TO DETERMINE SEDIMENT YIELD AND RUNOFF IN THE KEKLIK WATERSHED IN KAHRAMANMARAS, TURKEY
KORIŠTENJE MODELA GEOWEPP ZA ODREĐIVANJE PRODUKCIJE NANOSA I OTJECANJA U SLIVU RIJEKE KEKLIK U KAHRAMANMARASU U TURSKOJ
Mahmut REIS, Ilknur ALTUN ALADAG, Nursen BOLAT, Hurem DUTAL
Summary
GeoWEPP is a geo-spatial interface of the WEPP (The Water Erosion Prediction Project) model that predicts sediment yield and runoff using digital georeferenced information integrated with GIS tools. Besides, the model has ability to determine where the sediment yield and runoff occurs and locates possible deposition places. In this study, GeoWEPP model was used to estimate sediment yield and runoff from Keklik watershed, which is located 12 km from Kahramanmaras in the eastern Mediterranean region. The digital maps of the input files required for GeoWEPP model were generated using GIS tools. The estimated average annual sediment discharge and delivery of watershed were 34533.5 tones and 44.2 tones/ha, respectively. This study indicated that GeoWEPP model can provide decision makers with quick estimation of sediment yield from large watersheds with high accuracy. 
Key Words: Sediment Yield, Runoff, WEPP, GeoWEPP, GIS
INTRODUCTION
UVOD
For many years, renewable natural resources in Turkey have been excessively used without considering sustainable management plans; therefore, the natural balance that exists among plant, soil, and water has been adversely affected. However, the future of existing and next generation highly depends on continuous and efficient use of natural resources. Therefore, necessary environmental protection measures should be implemented immediately so that natural resources can be sustainably managed and improved in Turkey.
In Turkey, one of the most important factors that result in detrimental effects on natural resources is considered to be soil loss due to surface runoff by water in the mountainous regions and topsoil removal by wind in steppes (Yuksel et al., 2008). About 54% of the forest lands, 59% of agriculture areas, and 64% of rangelands are subject moderate and severe soil erosion incidents (GDCDE, 2012). In Turkey, slight (7.2%), moderate (20%), severe (36.4%), and very severe (22.3%) soil erosion are observed (GDREC, 2008). Relatively very small proportion of the land area is not subject to erosion incident.
The main reasons of erosion problem in Turkey are rough topographic conditions, destruction of vegetation, unsuitable land use practices, and inadequate erosion control measures. Especially Mediterranean region experiences significant levels of soil erosion due to steep slope throughout