Remote Sensing and GIS Study of Tectonics and Net Erosion Rates in the Zagros Structural Belt, Southwestern Iran

Ali, Sayyed Ahmad; Rangzan, Kazem; Pirasteh, Saied

doi:10.2747/0749-3878.40.4.258

Cited by 12 publications

(14 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The central-west Alborz Mountains in Iran has received enormous stress from SW to NE directions (Ayazi et al 2010;Pirasteh et al 2010a). It is possibly originated from the Red Sea due to the neo-tectonic activity that creates subduction changing the landscapes and topography in the tectonic active areas (Ali and Pirasteh 2003;Pirasteh et al 2009a, b;Safari et al 2009). Recently, the central and western Alborz region has faced variety of falls due to its rugged topography, active tectonic, high seismicity and extreme weather conditions.…”

Section: Introductionmentioning

confidence: 97%

A recent scenario of mass wasting and its impact on the transportation in Alborz Mountains, Iran using geo-information technology

et al. 2010

Self Cite

View full text Add to dashboard Cite

Mass movements or mass wasting is being considered as one of the severe forms of natural disasters. Iran is geographically located in the Alps-Himalaya seismicity belt. It has a high potential to mass wasting. This seismic phenomenon creates landslides and rock falls in the high mountains of Alborz and Zagros. These mass movements and various types of slides can be systematically assessed and mapped through traditional mapping frameworks using geoinformation technologies. The geo-information-based technology offers the earth scientist to study and map various types of mass movement and stability of slopes. In this study, we used field data coupling with the tectonic-related factors to provide a solution for slope-related hazards. Firstly, various geological and geomorphological factors such as lineaments and faults, vegetation, lithology, slope, drainage, land use/land cover, seismicity and roads network were extracted and compiled using geo-information technology. This is because the factors mentioned above play important role in the instability of the region. Then, the study area was divided into four regions based on the rate of mass wasting and its degree of vulnerability. The results of this study showed that the erosion in Karaj formation is severe. Additionally, this research also reveals that the hydrothermal solutions caused by the erosional activities have influenced the glassy element of tuffs and subsequently changed into the clays. This change has caused the tuffs to be relatively unstable. Further, it is evident that the chemical and physical weathering has had a big impact on it whilst most of the mass wasting has occurred within the unstable tuffs of Karaj formation. Finally, the paper concluded that the recent construction of the new roads in the region has increased the potential danger for generating the mass wastes and thus makes the region more unstable.

show abstract

Section: Introductionmentioning

confidence: 97%

A recent scenario of mass wasting and its impact on the transportation in Alborz Mountains, Iran using geo-information technology

et al. 2010

Self Cite

View full text Add to dashboard Cite

show abstract

“…Very few studies have quantified denudation in orogenic systems where precipitations are less than 500 mm/yr but with strong topographic gradient (Ali et al. ; Pan et al. ) and there is still a clear need to document denudation in such ranges.…”

Section: Introductionmentioning

confidence: 99%

“…Summerfield and Hulton, 1994;Montgomery and Brandon, 2002;Carretier et al, 2013), hence the climatic control cannot really be asserted on plateaus. Very few studies have quantified denudation in orogenic systems where precipitations are less than 500 mm/yr but with strong topographic gradient (Ali et al, 2003;Pan et al, 2010) and there is still a clear need to document denudation in such ranges.…”

Section: Introductionmentioning

confidence: 99%

Denudation intensity and control in the Chinese Tian Shan: new constraints from mass balance on catchment‐alluvial fan systems

Guérit

Barrier

Jolivet

et al. 2016

Earth Surf Processes Landf

View full text Add to dashboard Cite

Tectonics and climate are usually seen as the main controlling factors of denudation rates, which seem to rise with the tectonic activity and to decrease when the climate becomes drier. However, the low denudation rates observed in semi-arid to arid contexts are generally measured on orogenic plateaus where the respective influence of the flat relief and the dry climate cannot really be unravelled. The Chinese Tian Shan was chosen as a case study. In the northern piedmont of this mountain range, a series of well-preserved Quaternary alluvial fans offer the opportunity to perform a mass balance study at the scale of several catchment areas and several hundreds of thousands of years. Based on a geometrical reconstruction of these fans, the volumes of sediments exported out of 10 drainage basins during the Middle–Late Pleistocene (from ∼300 to ∼12 kyr) and the Holocene (from ∼12 kyr to present) have been estimated. From these volumes, an average denudation rate of ∼135 m/Myr was determined in the Tian Shan Range for the last 300 kyr. In agreement with other mass balances performed in the same area, the typical denudation intensity of the northern Tian Shan is thus of a few hundred meters per million years at most, regardless of the space and time scales considered. From a comparison with denudation rates in other mountain ranges throughout the world, we suggest that a dry climate can dramatically limit the denudation intensity even in active orogenic systems with a high topographic gradient like the Tian Shan. As a result, the time required to reach equilibrium between denudation and rock uplift in these systems could be extremely long (i.e. of more than several million years)

show abstract

“…trees and almond (Amygdalus spp.) shrubs [Ali et al, 2003;Pourreza et al, 2008;Djamali et al, 2009]. One of the most significant changes in this old-growth vegetation cover in the past decades has been the reduction of canopy cover mainly because of expansion of farms and agricultural lands.…”

Section: Study Areamentioning

confidence: 99%

A robust approach to generate canopy cover maps using UltraCam-D derived orthoimagery classified by support vector machines in Zagros woodlands, West Iran

Erfanifard

Khodaei

Shamsi

2014

European Journal of Remote Sensing

View full text Add to dashboard Cite

An approach was developed to construct a percent canopy cover (PCC) map of Zagros semi-arid woodlands, West Iran, using UltraCam-D airborne imagery. We detected crowns of Persian oak coppice trees on the imagery by use of the support vector machine (SVM) classifier optimized via Taguchi method. Then, PCC was calculated in raster grids with various block sizes and their accuracy metrics revealed the appropriate sizes. Results showed the optimized SVM success in separating Persian oak crowns as revealed in receiver operating characteristic (ROC) curve analysis (area under curve: AUC ~ 0.82). After filtering the raster maps and reassessing their accuracies, validation outputs of the final PCC map with 3000 m 2 resolution yielded an overall accuracy of 90% (KHAT=0.71) and was introduced as the optimal map in this study.

show abstract

Remote Sensing and GIS Study of Tectonics and Net Erosion Rates in the Zagros Structural Belt, Southwestern Iran

Cited by 12 publications

References 3 publications

A recent scenario of mass wasting and its impact on the transportation in Alborz Mountains, Iran using geo-information technology

A recent scenario of mass wasting and its impact on the transportation in Alborz Mountains, Iran using geo-information technology

Denudation intensity and control in the Chinese Tian Shan: new constraints from mass balance on catchment‐alluvial fan systems

A robust approach to generate canopy cover maps using UltraCam-D derived orthoimagery classified by support vector machines in Zagros woodlands, West Iran

Contact Info

Product

Resources

About