Determination of Some Factors Influencing Erosion by Using Remote Sensing and Geographic Information Sysytem in The Vicinity of Ankara Çubuk Dam Lake
Açýklama:
Due to stimulating topographic structure, erosion is a crucial problem in Turkey. In this study, the objective was to determine some factors influencing erosion by using RS and GIS techniques. Materials used in the study include aerial photos of 1969 and 1995 at scales of 1:21000 and 1:4000 respectively, topographic, soil and geological maps of 1:25000 scale, Landsat 7 images, camera and triangulation information of the aerial photos.
To obtain erosion map digital elevation points produced by means of photogrammetric digitization of
aerial photographs were transformed into grid model with grid interval of 0.5 meter. Changes took place
on land surface were calculated by extracting digital elevation classes produced from DTM (digital
terrain model) of 1995 from the DTM of 1969. Areas become eroded and subjected to accumulation
were classified according to erosion criterion of National Soil Map Legend, then mapped with different levels of erosion and accumulation.
From the digitized soil map, some layers have been formed by taking into consideration the characteristics such as soil characteristics combination - SCC, land use capability class – LUC.
A TIN model was composed using point data of 1969, then slope map was recreated. By statistical
analysis done between the slope map being recreated and land use capability, slope and depth classes of available soil map and erosion classes corresponding to the obtained erosion values, factors influencing land with regard to erosion were examined. The sample file in ArcInfo has been established and finally by using this file have been performed by the use of SPSS program.
Analysis have disclosed that an outstanding erosional phenomenon occured on VI. class lands, soils
having slope degree of 20-30 % and deep soils.
