Morphometric indices

List of Articles Morphometric indices

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1 - Neotectonic zoning using morphometric indices in Lali – Gotvand area, Khuzestan
Tayebeh Ahmadi Aziz Rahimi Hojahallah Safari Arash Barjasteh

Quantitative assessment forms and effects of the Earth's surface and calculation of morphometry indices of rivers, river channel, and mountain fronts are the best methods for investigation of the active tectonics. The studied area is located in Dezful Embayment zone of More

Quantitative assessment forms and effects of the Earth's surface and calculation of morphometry indices of rivers, river channel, and mountain fronts are the best methods for investigation of the active tectonics. The studied area is located in Dezful Embayment zone of the Zagros Simply Folded Belt. In this study, the tectonics and regional morphotectonics of Lali – Gotvand area are interpreted using digital elevation model. This research analyzed three indices including mountain front sinuosity (Smf), ratio of valley width to valley height (Vf) and stream length-gradient index (Sl). The morphometry indices were analyzed to determine tectonic activity according to general tectonic of Simply Folded Zagros and Dezful Embayment in Lali - Gotvand region in the north east of Khuzestan. After calculating the noted indices and information integration layers, the neotectonic zoning map were prepared as tectonic activity in 4 categories: very active, active, relatively active and non-active. According to these results, maximum tectonic activities have occurred in the North East based on stream length-gradient index, in East, North East, South East based on ratio of valley width to valley height and in North East, South East and central part based on mountain front sinuosity, respectively. The neotectonic zoning map shows the highest activity in the North, North East and Center and the lowest activity in the South of the study area. Manuscript profile
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2 - Investigation of the relationship between tectonic morphological indices and seismic acceleration in Indes, Aipak, Avaj and Kushk-e-Nusrat fault zones (northwest of Saveh)
bahar Rezaei nahal Mohsen Pourkermani M. Zare M. Dehbozorgi R. Nozaem

The northwest zone of Saveh city is located in the Indes, Kooshk e Nosrat, Avaj, and Aipak fault zones. Indes, Kooshk e Nosrat, Avaj, and Aipak faults are considered the major faults in central Iran, which are also active in the Quaternary, and their last movements are More

The northwest zone of Saveh city is located in the Indes, Kooshk e Nosrat, Avaj, and Aipak fault zones. Indes, Kooshk e Nosrat, Avaj, and Aipak faults are considered the major faults in central Iran, which are also active in the Quaternary, and their last movements are attributed to the present time. Therefore, the estimation of morphometry to identify the effect of active tectonics on the tectonic evolution of drainage basins seems necessary. In this study, six important morphotectonic indices were analyzed including the longitudinal gradient of the river, asymmetry of the drainage basin, hypsometric integral, drainage basin shape, the ratio of the floor width to the valley height, and mountain front. To model the formation of basins in the studied area, Arc Hydro software (Arc GIS add-ins) was used based on data derived from a digital elevation model. Then, 6 morphotectonic indices were compiled and classified on each of the basins. Finally, the Active Tectonic Index (IAT) was calculated, according to which the study area was classified into 4 categories including very high, high, intermediate, and low tectonic activity. According to the IAT index, 5% of the study area shows very high tectonic activity, 25% of the studied area has high tectonic activity, 65% of it has average tectonic activity and about 5% of the tectonic activity is low. Moreover, seismic acceleration was prepared to confirm the result of morphological indices in the estimation and analysis of active tectonics in the region. In this study, the highest level of tectonic activity can be seen in the north-eastern part of the area. In most sectors, the level of activity is high and intermediate, which is related to the activity of Kooshk-e-Nosrat, Aipak, and Avaj faults. Manuscript profile

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List of Articles Morphometric indices