Change point of river stream ow in Turkey

The present study aims to determine the hydrological change-year byevaluating the homogeneity of average annual streamow data in turkey. pertaining tothe years 1936-2005, change-year streamow data from 74 streamow gauging stations,which have no regulatory structure on the source side, and possessing a minimum of 39years of data, from streamow gauging stations located on 26 streamow basins in turkey,have been collected. by using the employed homogeneity tests, it has been attempted todetect the change year. employed methods are the buishand test, the pettitt test, thestandard normal homogeneity test and the von neumann test. by comparing the resultsobtained from tests, it is aimed to detect the consistency of the change years in gaugingstations. the change year could be detected in 16 gauging stations using three tests eachevery year, and 18 stations using 2 tests in the same year. it has also been ascertained thatchange years of streamow are geographically closer to each other in western turkey incomparison to the east. the reason for values in the west to be closer, with respect to bothlocation and time, might be attributed to the precipitation characteristics and uniformityof measured data