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ŠUMARSKI LIST 11-12/2017 str. 30     <-- 30 -->        PDF

and GIS tool (Figure 5), based on 110 hill slopes in the basin. The hydrological and sediment yield data computed by WEPP model was indicated in Table 2. The annual sediment yield occurring in the basin was 34533.5 tones, while annual sediment yield per unit area (hectare) was computed as 44,2 tones. The annual sediment deposition from the basin was determined as 7395.52 tones. The results indicated that runoff passing through the watershed outlet on an average annual basis was 600036 m3 based on the 17 storm events.
CONCLUSIONS
ZAKLJUČCI
This study was one of the first applications of GeoWEPP that searched for sediment yield and runoff in a rangeland area in Turkey. The results indicated that sample watershed was subject to erosion risk because the vegetation cover density was low (16%) and ground slope was classified as high, very high, and steep in most of the study area. It was found that GeoWEPP model could help watershed managers to generate accurate runoff and sediment yield outputs in text and/or graphical format using the digital data sources of a watershed. The model also gives the information for areas with high sediment delivery potential to watershed managers. For this reason, watershed managers can locate the problematic areas easily in a dam watershed and implement necessary precautions to prevent or minimize the sediment yield. In this particular study, input data and the components of GeoWEPP were described briefly and a sample was given as an example so that people who are interested in can use GeoWEPP in their areas of interests. It is highly expected that GeoWEPP users will increase in Turkey within a short period of time as more people use GIS techniques and computer based methods in their erosion prediction studies.
REFERENCES
LITERATURA
Akay, A.E., O. Erdas, M. Reis, A. Yuksel, 2008. Estimating sediment yield from a forest road network by using a sediment prediction model and gis techniques. Building and Environment, 43(5):687-695.
Balci, A.N, 1996. Soil conservation, I.U. Faculty of Forestry, Department of Watershed Management Istanbul. I.U. Faculty of Forestry Publications no: 439. Istanbul