Investigating the Role of Geomorphologic Factors on the Establishment of a Historical Site in Alshtar Plain of Lorestan Province

Geomorphology is one of the natural factors which has played on outstanding role in establishing settlements, such as Botki hill, in North-west Aleshtar plain. This hill is one the most important settlements Alashtar plain that has a history of about 8000-years old. Therefore, in the present study , considering geomorphology and historical this site, and considering this question have been considered to the geomorphology, The geomorphology features of this site were examintion. , using satellite images, topographic and geological maps, the geomorphological features influencing establishment of this site have been recognized, thus the geomorphological map of this region have been provided with the help of GIS software. Also, by creating trenches the sedimentary properties of site are addressed and described within geomorphological maps. Analysis of the results showed that adequate water and fertile sediments provided a basis for establishment of sustainable settlement,.however geomorphological factors have had a little effects on the site, replacement and destruction. these patterns reflected condditions considering geomorphological features in the establishment of this settlement. Data frome field surveys and satellite images of the region indicate that this region, from the start of its formation so far, have been subjected to a great deal of changes. in a way that, in addition to tectonic movments, external forces interactions affected the region. These factors in turn had an influence on formation and development of water resources and alluvial systems. According to the investigation of alluvial sections, alluviums with different thickness and grading have been shown. Therefore, from stratigraphy of these sections we can elicit that low and high-energy streams impacted the surface alternatively. Also, on the grounds that a vast part of Aleshtar area is confined with Limestone Mountains and suitable Karst systems and the amount of rain and water fall is also in good conditions, such characteristics lead to the formation of rich water sources in this area. So, enriched sources of water and fertile soil have provided a situation for formation of settlement from a very long time ago.