Improving Tectonic Geomorphology Analysis and Interpretation of River Mobility Utilizing LiDAR-derived DEMs
Journal Title: Trends in Civil Engineering and its Architecture - Year 2018, Vol 1, Issue 5
Abstract
This study contributed a reliability of Light Detection and Ranging (LiDAR) techniques to investigate tectonic geomorphology analysis of river mobility with high resolution Digital Elevation Models (DEMs). This study interpreted the impact of tectonic geomorphology on landslides occurrence in a rugged topography. In this study, river responses were investigated by using an integration of LiDAR, geomorphology, and a field survey to determine the tectonic geomorphology signatures. The study reveals that the Zagros Folded Belt (ZFB) of Iran with the rugged topography and vegetated area is susceptible to landslides associated with the Dez River in north of Khuzestan Province wherein the Khuzestan Plains the river systems were found to be mobile and able to respond, both laterally and vertically, to the active tectonics. The Zagros Mountains in Iran are greatly influenced by structural geology, tectonics, and bedrock lithology, and the courses of major rivers (Karun River and Dez River). The geomorphology of major rivers develops, at least partly, in response to a number of different external controls. For the time-scale of the Late Quaternary, key external forcing factors affecting the form of major rivers that have been recognized, including neo-tectonics, [1,2]), especially in the Zagros Mountains which have extensive neo-tectonics [3-5]. The Zagros Mountains are one of the youngest and best exposed fold- thrust belts of the Alpine-Himalayan orogenic system. The Zagros Orogen trends roughly NW-SE and can be subdivided into four major NW-SE trending zones. At fine scales, the river courses are variable with similar river reaches in similar tectonic scenarios apparently having different responses; diverting around uplifting areas where landslide hazards are suspected in some instances and cutting across them in others. In the Zagros Mountains (Iran) landslides mechanism associates with complex geological-geomorphological activities that have created an immature and rugged landscape and imposes landslide hazards. A high slope influences the stability of the region, particularly, with high tectonic activity. Also, the presence of active faults and sometimes earthquakes are triggering landslides in this region. Major rivers are complex systems with complex responses (both spatially and temporally), and studies often encounter difficulties in determining causes for observed changes in a river, even when parameters can be carefully controlled. One approach is to investigate the changes possibly impacted by the main key external factors using LiDAR remote sensing techniques and integrating them with spatial data and field observations. With such an approach it may be possible to collect detailed information and to improve and elucidate certain characteristics of the rivers Karun (Figure 1A) and Dez (Figure 1B) that are influenced more by tectonic geomorphology and specific external factors. The River Karun is the largest and one of the longest rivers of Iran. It crosses the Zagros Mountains in the south-west and flows into the Persian Gulf. The River Dez is also one of the rivers which crosses the Zagros Orogen and, after passing the city of Dezful, joins the Karun River. The rivers Karun and Dez have good potential for investigating the influences of external forcing factors on major rivers in a semi-arid foreland basin setting. The River Karun (Figure 1) and some parts of the River Dez flow through lowland south- west Iran. The River Karun is a major river, being about 890 km long, with a drainage catchment area of slightly greater than 60,000 km2 and a mean water discharge at Ahwaz of about 575m3s-1 [6].
Authors and Affiliations
Saied Pirasteh
Keywords
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- EP ID EP606835
- DOI 10.32474/TCEIA.2018.01.000122
- Views 66
- Downloads 0
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