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The change point of the annual precipitation data was determined for the years with the main change points. The main change point in the time series was computed by the Pettitt test. The results in Table 4 show that precipitations at three stations (Eskişehir, Manisa, and Afyon) have change points with a significance level of 5%. All of them may be seen in Figure 4. The change points for Eskişehir and Manisa stations occurred in the period of 1970–1980s. It is worth mentioning that similar results had already been achieved by the trend analysis of the D5 component of the annual precipitation at the same stations. On the other hand, the significant change point is 1963 for Afyon station (Figure 4). Three stations (İzmir, Muğla, and Bursa) have change points between 1940 and the 1950s. The change points are in the 1980s for Aydın and Edirne stations, but they are not statistically significant. The results confirm the sequential M-K results of the D5 component demonstrating the main change points for the long-term trends in hydrological data.
Table 4

Results of Pettitt test for change point analyses of the annual precipitation data

StationsChange point (year)
Eskişehir 1978 
İzmir 1955 and 1981 
Afyon 1963 
Aydın 1987 
Bursa 1950 
Muğla 1986 
Manisa 1980 
Edirne 1981 
StationsChange point (year)
Eskişehir 1978 
İzmir 1955 and 1981 
Afyon 1963 
Aydın 1987 
Bursa 1950 
Muğla 1986 
Manisa 1980 
Edirne 1981 
Figure 4

Pettitt's test results for detecting a change point in the annual precipitation. Dashed lines represent significance levels of 5%.

Figure 4

Pettitt's test results for detecting a change point in the annual precipitation. Dashed lines represent significance levels of 5%.

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