Özet:

This study aimed at investigation the geomorphologic characteristics of lower Kahta Stream Basin located over the belt of South-eastern Taurus Mountains and Adıyaman basin. In geomorphologic investigations, some specific areas play a key role in overcoming a variety of geomorphic problems. Lower Kahta Stream Basin, as well, plays a crucial role in specifying the geomorphologic characteristics of Adıyaman basin and its surrounding. The source of Kahta Stream comes from the Southeastern Taurus and also it is one of the most important tributaries of the Euphrates River. Kahta Stream Basin located in the north of Adıyaman basin had been deformed as being intersected by Eastern Anatolia fault, Southeastern Anatolia Thrust and Adıyaman fault. Because of its tectonic structure, the effect of recent tectonic moves is apparently seen in its morphological development. In the lower Kahta Stream Basin, the mountains areas in the same with anticlines have been intersected by the faults and so it has risen, while the bases of the basin have descended. Catching up with this tectonic change, the Kahta Stream has formed deep narrow straits by sinking into its streambed. The mountainous areas in the north of lower Kahta Stream Basin and high plateaus on them form the low plateaus and the main geomorphologic units of the Kahta Stream Valley. It is possible to see the forms evolving in the folded and faulted structure on the mountainous areas in the North. In the areas where streams intersect with the anticlines, mountain passes, mass movement on faulted slopes, karstic forms and terraces are the other important geomorphologic units in the lower basin. Keywords: Geomorphology, Southeastern Taurus Mountains, Adıyaman Basin, Kahta Stream, Lower Kahta Stream Basin.

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