نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشکده جغرافیای دانشگاه تهران
2 استاد دانشکده جغرافیای دانشگاه، تهران
3 دانشیار دانشکده جغرافیای دانشگاه تهران
4 استاد زمین شناسی (تکتونیک) پژوهشکده علوم زمین سازمان زمین شناسی کشور
چکیده
کلیدواژه‌ها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
The earth's crust is changing due to tectonic factors and the resulting compressive and tensional movements. The change in the longitudinal profile of rivers is one of the consequences of the effects of active tectonics. The main purpose of this study is to investigate the effect of active tectonics on the morphological structure of Siah-Kuh heights. For this purpose, using the elevation information of digital radar map height of 12.5 meters and using D8 algorithm, we extracted the waterways of the region and examined the two main rivers on the surface of Siah-Kuh heights. In this regard, we used the stream power formula taken from the two main variables of slope and drainage area of the river in the form of a logarithmic plot to extract the parameters of steepness and concavity. Increasing the steepness parameter indicates uplift activity and increasing the concavity parameter indicates no uplift activity or low bedrock resistance. Investigation of the effect of Damghan fault activity on the heights of Siah-Kuh using the stream power formula showed that the slip and transpressional movements of Damghan fault have made the Siah-Kuh in the form of a restraining bend with foreberg morphology. Wherever the river flows on the surface of the foreberg; Shows high values of the steepness parameter, and wherever it leaves the surface of the foreberg and flows on the loose Quaternary sediments of the surrounding alluvial fans, the values of the steepness parameter are reduced and the values of the concavity parameter are increased.
کلیدواژه‌ها [English]
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