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Nohegar, Ahmad, Norbakhsh, Fatemeh, Yazdan Panah, Mehdi. (1395). Arc changes in arid area rivers (Case study: Qomrood river in Iran). , 3(1), 11-18. doi: 10.22059/jnec.2017.218367.55
Ahmad Nohegar; Fatemeh Norbakhsh; Mehdi Yazdan Panah. "Arc changes in arid area rivers (Case study: Qomrood river in Iran)". , 3, 1, 1395, 11-18. doi: 10.22059/jnec.2017.218367.55
Nohegar, Ahmad, Norbakhsh, Fatemeh, Yazdan Panah, Mehdi. (1395). 'Arc changes in arid area rivers (Case study: Qomrood river in Iran)', , 3(1), pp. 11-18. doi: 10.22059/jnec.2017.218367.55
Nohegar, Ahmad, Norbakhsh, Fatemeh, Yazdan Panah, Mehdi. Arc changes in arid area rivers (Case study: Qomrood river in Iran). , 1395; 3(1): 11-18. doi: 10.22059/jnec.2017.218367.55

Arc changes in arid area rivers (Case study: Qomrood river in Iran)

Natural Environment Change
مقاله 2، دوره 3، شماره 1، فروردین 2017، صفحه 11-18    اصل مقاله (715.23 K)
نوع مقاله: Scientific and Research
شناسه دیجیتال (DOI): 10.22059/jnec.2017.218367.55
نویسندگان
Ahmad Nohegar1؛ Fatemeh Norbakhsh* 2؛ Mehdi Yazdan Panah3
1Professor, University of Tehran, Iran
2PhD Candidate in Geomorphology, Tarbiat Modares University, Tehran, Iran
3PhD Candidate in Geomorphology, Kharazmi University, Iran
چکیده
Qomrood river is one of the rivers that located in arid and semiarid area which has a seasonal fluvial. The river is faced many changes, because of floods or natural- human factors. This study, as a geomorphologic study, tries to survey and identify geometric changes between Kocherey dam and 15-Khordad dam. The study method is a mix of library research and field studies. In library method all papers in journals and sites that related to this topic were collected. In field studies, the data were collected through direct and indirect (satellite image) observations. For this goal, TM (1989), ETM (2000) and IRS (2009) satellite images were used. Accordingly, the tree central lines belonging to different periods of study were extracted. Then these lines separated to 6 parts with emphasize on geological and geomorphologic base. In order to change detection, fitted tangent circle model was used. This research showed that the curves of the river face to decrease, while in some parts that are located on harder geological segments, or always have water, face to increase. It means in these parts all curves and meanders are more than previous. Sinus numerical coefficient in all intervals indicates approximately 1.5 that indicates the average sinus condition of the river at present intervals, and this factor has not changed in these 20 years.
کلیدواژه‌ها
geometric changes؛ geomorphology؛ Qomrood river
مراجع
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  9. Nohegar, A.; Yamani, M. (2003). Surveying of geomorphologic situation of meander river and its roleon erosion of the bed and banks of Minab River (downstream of the Minab dam). Geographical Research, No:51, PP:65-84.
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