Geographical Research

Shah jahan، based on structural zone is located in south of kapedagh and in eastern side of Aladagh mountains in 37◦ till 37◦25'' northern latitude and 57◦30'' till 58◦30'' eastern longitude of northeastern part of Iran. Geomorphologic and tectonic elements show that this area is partly young and mountains can be affected highly by geomorphologic and hydrologic elements. Rivers branches are parallel and relatively condense placement of them in equal spaces، disordered zone roughness and for getting to their main drain (Atrac River)، they have cut different types of stratum، tectonic construction and various structures. The goal of this research is identification of reasons and phenomena that have caused hydrographic systems of adaptation or no adaptation with the land and lithological structure of the area. To do that the geological plans، typography، satellite pictures and field observations were used. After studying the elements of affecting the adaptation or no adaptation the results show that approximately، 1554/11 km (78/56 percent) waterway have structural adaptation، and 34/54 km (17/46 percent) have no structural adaption،  Km (1/54 percent) have lithological adaptation and 48/15 (2/43 percent) have no lithological adaptation،223/65 km (98/46 percent) have fault adaptation (tectonic) and 30/40km (1/54) have no adaption to the tectonic structure. Also، waterway''s length، valley''s width and the landscape''s width below the adaption systems are more than no adaption whereas; no adaption systems have more depth than adaption systems 91/32 times).