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  • 1.
    Brandt, S. Anders
    University of Gävle, Department of Technology and Built Environment, Ämnesavdelningen för samhällsbyggnad.
    Conceptualization of hydraulic and sedimentary processes in downstream reaches during flushing of reservoirs2005In: Proceedings of the XXXI IAHR Congress [Elektronisk resurs]: Water engineering for the future : choices and challenges : COEX Seoul September 11-16, 2005, Seoul: Korea Water Resources Association , 2005, p. 2577-2588Conference paper (Refereed)
    Abstract [en]

    The main focus of this paper is to describe the active hydraulic and sedimentary processes in downstream river reaches during flushing of sediments from reservoirs. During flushing extreme amounts of sediment may be released. Therefore, these processes are different than those downstream from dams and reservoirs not subjected to flushing. Hence, also the effects differ, which knowledge of may be of value for biologists, etc. During flushing of a reservoir a wave will be released to the downstream reaches. This wave can be divided into one water part and one sediment part. Initially they are in phase with each other, but with increased distance downstream from the dam, the transported sediment lags behind the water due to different traveling velocities. The paper treats when and where sedimentation occurs, and how this is related to the different traveling velocities of water and sediment. Also included are discussions on how the downstream effects during flushing differ from non-flushing effects, how visualization of effects can enhance both the analysis and communication with planners, politicians, etc., as well as discussions on how the studies of these effects can benefit from improved field-work methods.

  • 2.
    Brandt, S. Anders
    et al.
    University of Gävle, Department of Technology and Built Environment, Ämnesavdelningen för samhällsbyggnad.
    Jiang, Bin
    University of Gävle, Department of Technology and Built Environment, Ämnesavdelningen för samhällsbyggnad.
    3D geovisualization as a communication and analysis tool in fluvial geomorphology2004In: Geoinformatics 2004: proceedings of the 12th International Conference on Geoinformatics - Geospatial Information Research: Bridging the Pacific and Atlantic, University of Gävle, Sweden, 7-9 June 2004, Gävle: Gävle University Press , 2004, p. 339-346Conference paper (Refereed)
    Abstract [en]

    The fields of hydrology and fluvial geomorphology get more and more attention in the general public. The reason for this is changed climate patterns with increased frequencies of storms and river flooding and as a result changed geomorphology and living conditions for the inhabitants of the area. With the development of 3D geovisualization, hydrological and geomorphological processes can be better simulated and visualized. Thus not only the domain specialists, but also the general public can appreciate very complex hydrological processes and resulting geomorphology. This is of great value since a high frequency of storms and flooding has been a big issue for politicians, planners, and the general public. It is in this sense that 3D geovisualization can be an important tool for analysis and communication. Complex hydrological and geomorphological processes can be effectively simulated and analyzed by the domain specialists while efficient and effective visualization provides a common platform for communication among domain specialists and the general public. This paper will discuss and illustrate these issues using a case study of geomorphology along the Reventazón River, downstream from the Cachí Reservoir in Costa Rica, due to the release of extreme amounts of sediment during flushing of the reservoir.

  • 3.
    Deng, Hongling
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Mineralogi, petrologi och tektonik.
    Koyi, Hemin
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Mineralogi, petrologi och tektonik.
    Nilfouroushan, Faramarz
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Mineralogi, petrologi och tektonik.
    Superimposed folding and thrusting by two phases of mutually orthogonal or oblique shortening in analogue models2016In: Journal of Structural Geology, ISSN 0191-8141, E-ISSN 1873-1201, Vol. 83, p. 28-45Article in journal (Refereed)
    Abstract [en]

    Orogens may suffer more than one phase shortening resulting in superposition of structures of different generations. Superimposition of orthogonal or oblique shortening is studied using sandbox and centrifuge modelling. Results of sand models show that in orthogonal superimposition, the two resulting structural trends are approximately orthogonal to each other. In oblique superimposition, structures trend obliquely to each other in the relatively thin areas of the model (foreland), and mutually orthogonal in areas where the model is thickened during the first phase of shortening (i.e. the hinterland). Thrusts formed during the first shortening phase may be reactivated during the later shortening phase. Spacing of the later phase structures is not as wide as expected, considering they across the pre-existing thickened wedge. Superposition of structures results in formation of type 1 fold interference pattern. Bedding is curved outwards both in the dome and basin structures. Folded layers are dipping and plunging outwards in a dome, while they are dipping and plunging inwards in a basin. In the areas between two adjacent domes or basins (i.e. where an anticline is superimposed by a syncline or a syncline is superimposed by an anticline), bedding is curved inwards, and the anticlines plunge inwards and the synclines outwards. The latter feature could be helpful to determine the age relationship for type 2 fold interference pattern. In tectonic regions where multiple phases of shortening have occurred, the orogenic-scale dome-and-basin and arrowhead-shaped interference patterns are commonly formed, as in the models. However, in some areas, the fold interference pattern might be modified by a later phase of thrusting. Similar to models results, superimposition of two and/or even more deformation phases may not be recorded by structures all over the tectonic area.

  • 4.
    Farzipour-Saein, Ali
    et al.
    Department of Geology, University of Isfahan, Iran.
    Nilfouroushan, Faramarz
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Berggrundsgeologi.
    Koyi, Hemin
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Berggrundsgeologi.
    The effect of basement step/topography on the geometry of the Zagros fold and thrust belt (SW Iran): an analogue modeling approach2013In: International journal of earth sciences, ISSN 1437-3254, E-ISSN 1437-3262, Vol. 102, no 8, p. 2117-2135Article in journal (Refereed)
    Abstract [en]

    Systematic analogue models are run to study the variation in deformation across basement steps in the Zagros Fold-Thrust Belt. Our model results demonstrate that basement configuration/topography influences the sedimentation thickness and, hence, the kinematics and geometric evolution of the fold and thrust belt. The greater the difference in thickness between the adjacent cover units across a basement step, the sharper and clearer will be the offset the deformation front. Based on model results, we conclude that in a fold-thrust belt, where basement step/topography is covered by a layer of ductile salt acting as a decollement, the effect of the salt decollement on the evolution of the belt is far greater than the effect of thickness variation of the cover units.

  • 5.
    Joudaki, Masoud
    et al.
    Univ Isfahan, Dept Geol, Esfahan, Iran.
    Farzipour-Saein, Ali
    Univ Isfahan, Dept Geol, Esfahan, Iran.
    Nilfouroushan, Faramarz
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Berggrundsgeologi.
    Kinematics and surface fracture pattern of the Anaran basement fault zone in NW of the Zagros Fold-Thrust Belt2016In: International journal of earth sciences, ISSN 1437-3254, E-ISSN 1437-3262, Vol. 105, no 3, p. 869-883Article in journal (Refereed)
    Abstract [en]

    The preexisting north-south trending basement faults and their reactivation played an important role during the evolution of the Zagros fold-thrust belt. The Anaran basement fault in the Lurestan region, NW of the Zagros, has been considered as a N-S trending basement lineament, although its surface structural expression is still debated. In this study, we use satellite images and field observations to identify and analyze the fractures in the sedimentary cover above the Anaran basement fault. Fracture analysis demonstrates that approaching the Anaran basement fault, the fracture pattern changes. The fractures association with reactivation of the deep-seated preexisting Anaran basement fault can be categorized in 4 sets based on their directions. The mean direction for maximum compressional stress is different between the fault- and fold-related fractures within and around the ABF shear zone. We estimated an orientation of N30±5° for the fault-related fractures and N45±5° for the fold-related fracture sets outside of the ABF shear zone. This difference suggests that the fold-related and fault-related fracture sets have been formed in different two stages of deformation throughout the area. The axial traces of some folds, especially the Anaran anticline, demonstrate a right-lateral offset along the ABF, such that, in central part of the Anaran anticline, the fold axis of this anticline is changed from its original NW–SE trend to approximately north-south trend of the ABF.

  • 6.
    Liu, Zhina
    et al.
    Uppsala universitet, Berggrundsgeologi.
    Koyi, Hemin
    Uppsala universitet, Berggrundsgeologi.
    Nilfouroushan, Faramarz
    Uppsala universitet, Berggrundsgeologi.
    Kinematics and internal deformation within 3-D granular slopes: insights from analogue mdoels and natural slopes2013Conference paper (Refereed)
    Abstract [en]

    This study uses results of a series of analogue models, scanned data of natural landslides, and sections of natural failed slopes to investigate the kinematics and internal deformation during the failure of an unstable slope. The models simulate collapse of granular slopes by focusing on the spatial and temporal distribution of their internal structures. Model results show that the collapse of granular slopes resulted in different-generation extensional normal faults at the back of the slope, and contractional structures such as overturned folds, shealth folds and thrusts at the toe of the slope. The failure surfaces and the volume of the failure mass changed both spatially and temporally. Our model results show also that the nature of runout base has a significant influence on the kinematics and internal deformational structures. The runout distance increased with decreasing basal friction of a rigid runout base, and the topography at the slope toe was much gentler in the model with lower basal friction along the rigid runout base. The runout distance was shortest in the granular slope with deformable runout base. More extensional normal faults occurred in the model with low-friction runout base, whereas more shortening structures formed in the model with high-friction runout base. Similar tomodel results, our field observations indicate the presence of at least two generations of failure surfaces where the older ones are steeper.

  • 7.
    Liu, Zhina
    et al.
    Uppsala universitet, Berggrundsgeologi.
    Koyi, Hemin
    Uppsala universitet, Berggrundsgeologi.
    Swantesson, Jan
    Karlstad University.
    Nilfouroushan, Faramarz
    Uppsala universitet, Berggrundsgeologi.
    Reshetyuk, Yuriy
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Urban and regional planning/GIS-institute.
    Kinematics and 3-D internal deformation of granular slopes: analogue models and natural landslides2013In: Journal of Structural Geology, ISSN 0191-8141, E-ISSN 1873-1201, Vol. 53, p. 27-42Article in journal (Refereed)
    Abstract [en]

    This study uses results from a series of analogue models, and field observations, scanned data and sections of natural landslides to investigate the kinematics and internal deformation during the failure of an unstable slope. The models simulate collapse of granular slopes and focus on the spatial and temporal distribution of their internal structures. Using a series of systematically designed models, we have studied the effect of friction and deformability of the runout base on internal deformation within a granular slope. The results of these different models show that the collapse of granular slopes resulted in different-generation extensional faults at the back of the slope, and contractional structures (overturned folds, sheath folds and thrusts) at the toe of the slope. The failure surfaces and the volume of the failure mass changed both spatially and temporally. Younger failure surfaces formed in the back of the older ones by incorporating additional new material from the head of the slope. Our model results also show that the nature of the runout base has a significant influence on the runout distance, topography and internal deformation of a granular slope. Model results are compared with natural landslides where local profiles were dug in order to decipher the internal structures of the failure mass. The natural cases show similar structural distribution at the head and toe of the failure mass. As in model results, our field observations indicate the presence of at least two generations of failure surfaces where the older ones are steeper.

  • 8.
    Mousavi, Z.
    et al.
    ISTerre, Université Joseph Fourier, Grenoble, France; National Cartographic Center, Geodetic Department, Tehran, Iran.
    Walpersdorf, A.
    ISTerre, Université Joseph Fourier, Grenoble, France.
    Walker, R.T.
    Department of Earth Sciences, University of Oxford, Oxford, UK.
    Tavakoli, F.
    National Cartographic Center, Geodetic Department, Tehran, Iran.
    Pathier, E.
    ISTerre, Université Joseph Fourier, Grenoble, France.
    Nankali, H.
    National Cartographic Center, Geodetic Department, Tehran, Iran.
    Nilfouroushan, Faramarz
    Department of Earth Sciences, Uppsala University, Uppsala, Sweden.
    Djamour, Y.
    National Cartographic Center, Geodetic Department, Tehran, Iran.
    Global Positioning System constraints on the active tectonics of NE Iran and the South Caspian region2013In: Earth and Planetary Science Letters, ISSN 0012-821X, E-ISSN 1385-013X, Vol. 377-378, p. 287-298Article in journal (Refereed)
    Abstract [en]

    We present a velocity field compiled from a network of 27 permanent and 20 campaign GPS stations  across NE Iran. This new GPS velocity field helps to investigate how Arabia-Eurasia collision deformation is accommodated at the northern boundary of the deforming zone. The present-day northward motion decreases eastward from 11 mm/yr at Tehran (~52°E) to 1.5 mm/yr at Mashhad  (~60°E). N-S shortening across the Kopeh Dagh, Binalud and Kuh-e-Surkh ranges sums to 4.5±0.5 mm/yr at longitude 59°E. The available GPS velocities allow us to describe the rigid-body rotation of the South Caspian about an Euler pole that is located further away than previously thought. We suggest that two new stations (MAVT and MAR2), which are sited far from the block boundaries, are most  likely to indicate the full motion of the South Caspian basin. These stations suggest that NW motion is accommodated by right-lateral slip on the Ashkabad fault (at a rate of up to 7 mm/yr) and by up to 4-6 mm/yr of summed left-lateral slip across the Shahroud left-lateral strike-slip system. Our new GPS results are important for assessing seismic hazard in NE Iran, which contains numerous large population centers and possesses an abundant historical earthquake record. Our results suggest that the fault zones along the eastern Alborz and western Kopeh Dagh may accommodate slip at much faster rates than previously thought. Fully assessing the role of these faults, and the hazard that they represent, requires independent verification of their slip-rates through additional GPS measurements and geological fieldwork.

  • 9.
    Nilfouroushan, Faramarz
    et al.
    Uppsala universitet, Berggrundsgeologi.
    Pysklywec, Russell
    Department of Geology, University of Toronto, Canada .
    Cruden, Alexander
    Department of Geology, University of Toronto, Canada M5S 3B1 c School of Geosciences, Monash University, Melbourne, Australia.
    Sensitivity analysis of numerical scaled models of fold-and-thrust belts to granular material cohesion variation and comparison with analogue experiments2012In: Tectonophysics, ISSN 0040-1951, E-ISSN 1879-3266, Vol. 526-529, p. 196-206Article in journal (Refereed)
    Abstract [en]

    Scaled analog and numerical brittle–viscous shortening models are employed to evaluate how fold–thrust structures evolve with changes in the cohesion of brittle materials, a rather poorly constrained physical parameter at this scale of experiment. The shortening models are characterized by various styles of shear zones and features resembling pop-up structures. The kinematics, geometry, and number of these structures are controlled by the viscous detachment layers in the models; the finite deformation of the model wedges is fundamentally different in model sets with one or two viscous layers. We demonstrate that the structural evolution of the numerical models is very sensitive to small changes in cohesion value. This is especially pronounced in the experiments that incorporate two weak viscous layers. The overall deformation of the numerical models is most similar to analog models when cohesion values are 70–80 Pa.

  • 10.
    Nilfouroushan, Faramarz
    et al.
    Uppsala University, Earth Sciences, Uppsala, Sweden; Department of Earth Sciences, University of Toronto, Toronto, Canada.
    Pysklywec, Russell
    Department of Earth Sciences, University of Toronto, Toronto, Canada.
    Cruden, Alexander
    Department of Earth Sciences, University of Toronto, Toronto, Canada;School of Geosciences, Monash University, Melbourne, Australia.
    Koyi, Hemin
    Uppsala University, Earth Sciences, Uppsala, Sweden .
    Numerical modeling of salt-based mountain belts with pre-existing basement faults: application to the Zagros fold- and thrust belt, southwest Iran2013Conference paper (Refereed)
    Abstract [en]

    Two-dimensional thermal-mechanical models of thick-skinned, salt-based fold- and thrust belts, such as the Zagros,SW Iran, are used to address: 1) the degree of deformation and decoupling between cover and basement rocks dueto the presence of a weak salt detachment; 2) the reactivation potential of pre-existing basement normal faults dueto brittle or ductile behavior of the lower crust (as related to cold or hot geothermal gradients); and 3) variations indeformation style and strain distribution. The geometry and kinematics of the orogenic wedge and the activity ofpre-existing basement faults are strongly influenced by the geothermal gradient (defined by the Moho temperature,MT) and basement rheology. We infer that the MT plays a major role in how the lower and upper crust transferdeformation towards the foreland. In relatively hot geotherm models (MT = 600C at 36 km depth), the lowermostbasement deforms in a ductile fashion while the uppermost basement underlying the sedimentary cover deformsby folding, thrusting, and displacements along pre-existing basement faults. In these models cover units abovethe salt detachment are less deformed in the hinterland. In relatively cold geotherm models (MT = 400C at 36km depth), deformation is mainly restricted to the hinterland of the models where basement imbricates form.Detachment folding, thrusting and gravity gliding occur within cover sediments above uplifted basement blocks.Gravity gliding contributes to a larger amount of shortening in the cover compared to the basement.

  • 11.
    Nilfouroushan, Faramarz
    et al.
    Hans Ramberg Tectonic Laboratory, Department of Earth Sciences, Uppsala University, Uppsala, Sweden; Department of Earth Sciences, University of Toronto, Toronto, ON, Canada.
    Pysklywec, Russell
    Department of Earth Sciences, University of Toronto, Toronto, ON, Canada.
    Cruden, Alexander
    School of Geosciences, Monash University Victoria, Melbourne, Australia.
    Koyi, Hemin
    Hans Ramberg Tectonic Laboratory, Department of Earth Sciences, Uppsala University, Uppsala, Sweden.
    Thermal-mechanical modeling of salt-based mountain belts with pre-existing basement faults: application to the Zagros fold and thrust belt, southwest Iran2013In: Tectonics, ISSN 0278-7407, E-ISSN 1944-9194, Vol. 32, no 5, p. 1212-1226Article in journal (Refereed)
    Abstract [en]

    Two-dimensional thermal-mechanical models of thick-skinned, salt-based fold and thrust belts,  such as the Zagros, SW Iran, are used to address: 1) the degree of deformation and decoupling between cover and basement rocks due to the presence of a weak salt detachment; 2) the reactivation potential of pre-existing basement normal faults due to brittle or ductile behavior of the lower crust (as related to cold or hot geothermal gradients); and 3) variations in deformation style and strain distribution. The geometry and kinematics of the orogenic wedge and the activity of pre-existing basement faults are strongly influenced by the geothermal gradient (defined by the Moho temperature, MT) and basement rheology. We infer that the MT plays a major role in how the lower and upper crust transfer deformation towards the foreland. In relatively hot geotherm models (MT = 600°C at 36 km depth), the lowermost basement deforms in a ductile fashion while the uppermost basement underlying the sedimentary cover deforms by folding, thrusting, and displacements along pre-existing basement faults. In these models, cover units above the salt detachment occur within a less deformed, wide plateau in the hinterland. In relatively cold geotherm models (MT = 400°C at 36 km depth), deformation is mainly restricted to basement imbricate thrusts that form within the orogenic hinterland. Detachment folding, thrusting and gravity gliding occur within cover sediments above uplifted basement blocks. Gravity gliding contributes to a larger amount of shortening in the cover compared to the basement.

  • 12.
    Schmidinger, Helen
    et al.
    Uppsala universitet.
    Brandt, S. Anders
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS.
    Närområdesexkursioner och inre motivation för bättre lärande: en studie i svenska gymnasieskolan2015In: Nordidactica: Journal of Humanities and Social Science Education, ISSN 2000-9879, Vol. 2015, no 1, p. 22-46Article in journal (Refereed)
    Abstract [en]

    This paper reports results from two locally based geography excursions at two secondary schools in Sweden, in order to study how the pupils’ own experience from the local neighborhood, intrinsic motivation, and flow interact during the learning process to see if these parameters affect their understanding and knowledge of the studied objects. The methods used were observations during the excursions, as well as interviews and questionnaires afterwards. The results show that the pupils believe that they learn more when studying objects in their natural environment, i.e. outside their classroom. Furthermore, the results show that intrinsic motivation may be difficult, but not impossible, to achieve, and also that there are good opportunities for attaining flow. If the pupils can see patterns and structures of the objects and processes studied, they will start understand and gain knowledge. This process will increase chances for intrinsic motivation, which will further increase understanding and knowledge, and attaining flow. Once achieved, a spiral process of continued flow, continued intrinsic motivation, and increasing knowledge may be maintained.

  • 13. Vajedian, Sanaz
    et al.
    Motagh, Mahdi
    Nilfouroushan, Faramarz
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Mineralogi, petrologi och tektonik.
    Response to Sowter, A.; Cigna, F. On the Use of the ISBAS Acronym in InSAR Applications. Comment on Vajedian, S.; Motagh, M.; Nilfouroushan, F. StaMPS Improvement for Deformation Analysis in Mountainous Regions: Implications for the Damavand Volcano and Mosha Fault in Alborz. Remote Sens. 2015, 7, 8323–83472015In: Remote Sensing, ISSN 2072-4292, E-ISSN 2072-4292, Vol. 7, no 9, p. 11324-11325Article in journal (Refereed)
  • 14.
    Vajedian, Sanaz
    et al.
    Department of Surveying and Geomatics Engineering, University of Tehran, Tehran, Iran.
    Motagh, Mahdi
    GFZ German Research Center for Geosciences, Potsdam, Germany; Department of Surveying and Geomatics Engineering, University of Tehran, Tehran, Iran.
    Nilfouroushan, Faramarz
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Berggrundsgeologi.
    STaMPS improvement for deformation analysis in mountainous regions: Implications for Damavand volcano and Mosha fault in Alborz2015In: Remote Sensing, ISSN 2072-4292, E-ISSN 2072-4292, Vol. 7, no 7, p. 8323-8347Article in journal (Refereed)
    Abstract [en]

    Interferometric Synthetic Aperture Radar (InSAR) capability to detect slow deformation over terrain areas is limited by temporal decorrelation, geometric decorrelation and atmospheric artefacts. Multitemporal InSAR methods such as Persistent Scatterer (PS-InSAR) and Small Baseline Subset (SBAS) have been developed to deal with various aspects of decorrelation and atmospheric problems affecting InSAR observations. Nevertheless, the applicability of both PS-InSAR and SBAS in mountainous regions is still challenging. Correct phase unwrapping in both methods is hampered due to geometric decorrelation in particular when using C-band SAR data for deformation analysis. In this paper, we build upon the SBAS method implemented in StaMPS software and improved the technique, here called ISBAS, to assess tectonic and volcanic deformation in the center of the Alborz Mountains in Iran using both Envisat and ALOS SAR data. We modify several aspects within the chain of the processing including: filtering prior to phase unwrapping, topographic correction within three-dimensional phase unwrapping, reducing the atmospheric noise with the help of additional GPS data, and removing the ramp caused by ionosphere turbulence and/or orbit errors to better estimate crustal deformation in this tectonically active region. Topographic correction is done within the three-dimensional unwrapping in order to improve the phase unwrapping process, which is in contrast to previous methods in which DEM error is estimated before/after phase unwrapping. Our experiments show that our improved SBAS approach is able to better characterize the tectonic and volcanic deformation in the center of the Alborz region than the classical SBAS. In particular, Damavand volcano shows an average uplift rate of about 3 mm/year in the year 2003–2010. The Mosha fault illustrates left-lateral motion that could be explained with a fault that is locked up to 17–18 km depths and slips with 2–4 mm/year below that depth.

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