Books by Mihai Ciprian Margarint
Maps of landslide susceptibility are useful tools for risk analysis and assessment with practical... more Maps of landslide susceptibility are useful tools for risk analysis and assessment with practical implications because they provide relevant information for territorial planning, land use sustainable management or even forecast and early warning systems. Achievement of accurate assessments of landslide susceptibility for large regions (i.e. including national territories) is still a challenge, mainly because of the lack of proper landslide inventory and monitoring data. Romania represents one of the most landslide-affected countries in Europe. The current study presents an approach for drawing the landslide susceptibility map at national scale for the Romanian territory, in agreement with the European methodological framework promoted for small-scale evaluations of landslide susceptibility. The methodological approach was adapted specific mophostructural, climatic and landuse conditions of the country, as well as to the quantity and quality of the available data, in order to achieve a susceptibility zonation for slides and flows for the national territory. It follows a mixed statistical-heuristic approach based on a Spatial Multi-Criteria Evaluation (SMCE) procedure integrating landslide information and expert knowledge. The national landslide susceptibility map outlines large areas ranked as having high and very high susceptibility throughout the Subcarpathian chain, the Moldavian and Transylvanian Plateaux and the Getic Piedmont. The prediction performance was examined quantitatively and qualitatively, by making use of regional geomorphical knowledge. The evaluations suggest that, despite uncertainties inherent at this analysis scale, spatially-differentiated models are able to better capture landslide conditioning frameworks and reproduce inter- and, especially, intra-regional variability of landslide distribution as compared to a previous version of the national susceptibility map. The study proves that combining statistic and heuristic approaches, calibrated and later on validated for distinct homogeneous morpho-lithostructural units allows to increase the prediction capacity of the national-scale model. The results are useful to public authorities at national, regional, county and municipality levels, providing knowledge for the enhancement of disaster prevention and response plans.
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Remote Sensing of Geomorphology, 2020
Gully formation and evolution represent an important aspect of landform evolution, but also of pr... more Gully formation and evolution represent an important aspect of landform evolution, but also of practical interest regarding hydrology and agriculture. The classic methodology of assessing the intensity of these erosion processes, and the volumes of sediments involved, is to use field measurements or classical/digital photogrammetry. These methods were recently completed by the use of high-resolution Digital Elevation Models (DEMs) derived from multitemporal LiDAR data and UAV images. In the Moldavian Plateau (north-eastern Romania) gullies are common landforms due to geologic, topographic, climatic and anthropic factors. Their episodic development and the relationship with high rainfall and/or snowmelt events constitute a key point in the deciphering the gully evolution. For this work we have chosen the case of four gullies developed in the lacustrine deposits of abandoned anthropic reservoirs and which presented an obvious dynamic in the last two decades on remote sensing images. A DJI Phantom 4 Pro UAV was flown over the study case areas and acquired images with 80% side and forward overlap at 20 MP resolution. The UAV point cloud was obtained using the Structure from Motion (SfM) technique in VisualSFM open source software from overlapping images and was georeferenced with ground control points. Georeferenced LiDAR point clouds acquired in winter 2012 were used as a reference dataset. The filtering of the point clouds for obtaining bare ground points was performed with the Multiscale Curvature Classification (MCC) algorithm. The point cloud ground data for both the sources and periods were used to interpolate a 0.25 m resolution bare earth DEMs for every gully. This LiDAR reference DEM was used together with the UAV SfM DEM for deriving the Dem of Differences (DoDs) using the Geomorphic Change Detection technique of Wheaton et al. (2010) implemented in SAGA GIS and R stat. The GCD was applied with both uniform and spatially variable thresholding, the threshold errors being derived from GCPs and from co-registration of the DEMs. Geomorphological mapping was performed for establishing the spatially variable thresholds and for assessing the sediment budget. The results highlighted the areas that were affected by erosion and deposition and allowed us to evaluate the process rate for every studied gully, for every gully element and to derive a raw sediment budget, showing that LiDAR, UAV SfM and DoD are useful methods in geomorphological mapping and rate of process studies.
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""Located in north-eastern Romania, Iaşi County (with a surface of approx.
5497 km2) partially o... more ""Located in north-eastern Romania, Iaşi County (with a surface of approx.
5497 km2) partially overlaps all geographical units comprised by the Moldavian
Plateau: the Suceava Plateau to the west, the Bârlad Plateau to the south and the
Hilly Plain of Jijia in the center, north and east. This area is clearly individualized
by its physical and human geographical particularities, on the level of the natural
relief units, as well as in the contact zones.
The County of Iasi has been so far the object of various studies and
analyses conducted mainly by local geographers, who have only studied its
territory, the entire area of the Carpathian foreland, and rather small natural or
administrative territorial offcuts.
The present work aimes at completing the already existing studies, by
means of tackling numerous geographical problems that may be analysed using
satellite images and the specific spectral responses.
This research paper includes the analysis and interpretation of several
types of images, such as aerial photos from the 1970s or the 1980s, and satellite
shots (LANDSAT, SPOT, ASTER) taken during the period 1990-2001. The
referenced framework insured by TNT Mips software has allowed the conducting
of complex spatial and dynamic analyses. Therefore, several generations of maps
at different proportion scales (1:25.000 – 1:200.000) have been used, starting with
Moldavia’s topographical map from 1894 (1:50.000) and ending with the 1996
(1:100.000) edition. The Digital Elevation Model with frames of 20 m
equidistance or even 10 m, in case of rather complex relief, has been elaborated
having as reference the 1:50.000 topographical map re-edited in 1973. By means
of using the DEM, there have been created maps with different pixel dimension
values (100, 50, 30, 10 m). Many other cartographic appliances, representing for
example land use (1:50.000) or soil cover (1:200.000), have also been imported as
vectors.
In the first chapter, the position, limits and general geographical
characteristics of the studied area are being established. ...
....
....
....""
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Papers by Mihai Ciprian Margarint
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EGU General Assembly Conference Abstracts, Apr 1, 2019
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Frontiers in Plant Science, Dec 8, 2022
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Multi-hazard risk perception represents a research subject that has been gaining momentum in the ... more Multi-hazard risk perception represents a research subject that has been gaining momentum in the context of the Covid-19 pandemic, based on the interaction between management practices aiming to reduce infection rates and to reduce the impact of other co-occurring natural hazards. The concurrent hazards proved to be the source of many hurtful, high-cost, but still invaluable lessons that should be capitalised on by the new generations to progress towards improved multi-hazard management strategies, and to a more sustainable, resilient and equitable society, as proposed by the 2030 Agenda for Sustainable Development. However, such high-level orders cannot be obtained without an adequate understanding of the new challenges posed by multi-hazard risks.This paper aims to investigate the multi-hazard risk perception of young professionals or students who follow education programmes that aim to develop knowledge and skills related to the very subject of perception (i.e., natural hazards a...
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International Journal of Disaster Risk Reduction
Multi-hazard risk perception is an emerging research topic that has been gaining more and more in... more Multi-hazard risk perception is an emerging research topic that has been gaining more and more interest since the beginning of the Covid-19 pandemic, due to the unprecedented interactions between the management practices of the pandemic and of other co-occurring natural hazards, and to the compounded impact of these multi-hazards. This paper aims to investigate the specialization and study level-dependent differences concerning multi-hazard risk perception and hazardrelated education insights of future potential specialists in natural hazard-induced risk management and tourism reconstruction. These differences were explored by applying a multi-layer questionnaire on 547 Geography and Tourism students and graduates from two universities in Iași City (Romania) and Novi Sad (Serbia), and performing descriptive and differential statistical analyses. The statistically significant differences that emerged refer to estimations of the impact level of the Covid-19 pandemic and of other natural hazards at different spatial scales and on different socioeconomic activities, on the training/career of the respondents, and to the hazardrelated education improvements. Up to date, none of the papers in the existing literature integrate both the Covid-19 pandemic and the co-occurrent natural hazards as objects of students' perception, which makes the present study a starting point for such research endeavours.
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Sustainability
Land use is paramount to sustainable development, and in the past, important changes happened und... more Land use is paramount to sustainable development, and in the past, important changes happened under the influence of various factors. Revealing these changes in a meaningful manner, not just as total statistics but also as fluxes and at a spatial level, allows us to detect and associate them with the factors involved. We show a study case in Iași County, Romania, using a raster approach to change detection for a land-use-type database that extends to the 1920s. The database was created from topographic, remote sensing, and field data collected between 1920 and 2006, with five intervals between 1960, 1980, 1990, and 2000, starting from CORINE Land Cover data. These periods mark the socio-political and natural changes in the study area. The change detection results are well matched with the identified drivers and their spatial distribution. The fluctuations between land-use types provide a good way to create drivers’ associations. Our analysis can be easily applied to any other concer...
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Remote Sensing
Climate models predict the further intensification of global warming in the future. Drylands, as ... more Climate models predict the further intensification of global warming in the future. Drylands, as one of the most fragile ecosystems, are vulnerable to changes in temperature, precipitation, and drought extremes. However, it is still unclear how plant traits interact with soil properties to regulate drylands’ responses to seasonal and interannual climate change. The vegetation sensitivity index (VSI) of desert scrubs in the Qaidam Basin (NE Tibetan Plateau) was assessed by summarizing the relative contributions of temperature (SGST), precipitation (SGSP), and drought (temperature vegetation dryness index, STVDI) to the dynamics of the normalized difference vegetation index (NDVI) during plant growing months yearly from 2000 to 2015. Nutrient contents, including carbon, nitrogen, phosphorus, and potassium in topsoils and leaves of plants, were measured for seven types of desert scrub communities at 22 sites in the summer of 2016. Multiple linear and structural equation models were use...
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AGU Fall Meeting Abstracts, Dec 1, 2019
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EGU General Assembly Conference Abstracts, Apr 1, 2018
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EGUGA, Apr 1, 2017
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<p>Landslides and gullies are essential drivers of land degradation... more <p>Landslides and gullies are essential drivers of land degradation, especially when interacting through positive and negative feedback loops. In hilly non-forested areas, landslides can be triggered by gullies, and gully follows landslides, generating positive feedback geomorphic systems at hillslope scale level. Landsliding can also restrict gully incision through generalized bank failure, especially in clayey lithology, causing negative feedback geomorphic systems at the same scale.<br>High-resolution topography is needed in order to map the morphologies produced by the above-mentioned hillslope geomorphic systems.Repeat high-resolution topography is also able to pinpoint small-scale evolution shaped by the processes that were discussed above. The high-resolution topography is especially powerful in geomorphological analysis of hillslopes in non-forested and sparse vegetated hilly areas.<br>We present the coupling of LiDAR and Structure from Motion (SfM) high-resolution DEMs for mapping and geomorphic change detection analysis of a hillslope geomorphic system that includes interacting landslides and gullies with both positive and negative feedbacks.<br>The LIDAR data from 2012 (2 to 6 points per square meter) and the SfM data from 2019 (5 to 10 points per square meter) are used for creating high-resolution topography that represents the base for both geomorphological mapping and geomorphic change detection. This advanced remote sensing data is obtained and processed using various methods (co-registration, geomorphic change detection, geomorphometric mapping) in order to map and understand gully and landslide interactions along a hillslope from Moldavian Plateau, Northeastern Romania. The additional ortophoto-imagery obtained through the SfM process is usable in the geomorphological mapping based on the high-resolution DEM.<br>The results show the presence on the same hillslope of both positive and negative feedback geomorphic systems that have important control on soil erosion and land degradation. The shallow retrogressive landsliding is favoring soil erosion, but the hummocky topography predisposes to surface water and sediment dysconnectivity. Piping appears in connection with the subsurface routing of water, a situation that favors gully initiation and development. Gully development will trigger landslides, but on sectors, gully evolution is stopped by the bank failure through landsliding. The dry climate does not favor connectivity, and gully evolution might stop. Land use and anthropogenetic impact introduce disequilibrium that restarts gully<br>evolution. In this geomorphological context, the land degradation is amplified by the land use (intensive degraded pasture), anthropic modifications (dirt roads), and the presence of piping due to the lithology.<br>In the presented study, advanced remote sensing is used for the analysis of landslide and gully interaction that favor land degradation. We show how remote-sensing based high-resolution topography both in non and multitemporal setting allow the characterization of geomorphic systems at the hillslope scale.</p>
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Cet article propose l’evaluation de la susceptibilite aux glissements de terrain dans deux secteu... more Cet article propose l’evaluation de la susceptibilite aux glissements de terrain dans deux secteurs de collines basses de Roumanie. Par l’application de la methode de regression logistique, on se propose de saisir les relations entre les facteurs responsables de l’occurence des glissements de terrain et leur distribution spatiale. Le traitement automatique des donnees par SIG prend en compte la pente, la nature geologique du terrain, l’exposition des versants, la distance par rapport au reseau de drainage et les precipitations annuelles. On obtient ainsi deux cartes de susceptibilite aux glissements. La validite du modele de prediction a ete verifie a l’aide de la courbe ROC (Receiver Operating Characteristic), respectivement pour l’aire AUC situee sous la courbe (Area Under the Curve), en mettant en evidence un degre eleve de prediction.Cet article propose l’evaluation de la susceptibilite aux glissements de terrain dans deux secteurs de collines basses de Roumanie. Par l’applicati...
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GEOREVIEW: Scientific Annals of Stefan cel Mare University of Suceava. Geography Series, 2016
A particular environmental feature of the northern part of Moldavian Plateau (NE Romania) is the ... more A particular environmental feature of the northern part of Moldavian Plateau (NE Romania) is the large number of anthropic lakes along river courses. Even more, due to climatic, hydrological, hydrogeological and geomorphological settings and human activities (dominated by an extensive agriculture) this characteristic was mentioned and mapped in writen records and cartographic representations in many historical stages of the humanization of this region. The need for watter supply have forced the inhabitants to build dams of various sizes along the entire river network. Over the time, many dams were abandoned, while others have been relocated with a impresive dynamic at historical time scale
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Books by Mihai Ciprian Margarint
5497 km2) partially overlaps all geographical units comprised by the Moldavian
Plateau: the Suceava Plateau to the west, the Bârlad Plateau to the south and the
Hilly Plain of Jijia in the center, north and east. This area is clearly individualized
by its physical and human geographical particularities, on the level of the natural
relief units, as well as in the contact zones.
The County of Iasi has been so far the object of various studies and
analyses conducted mainly by local geographers, who have only studied its
territory, the entire area of the Carpathian foreland, and rather small natural or
administrative territorial offcuts.
The present work aimes at completing the already existing studies, by
means of tackling numerous geographical problems that may be analysed using
satellite images and the specific spectral responses.
This research paper includes the analysis and interpretation of several
types of images, such as aerial photos from the 1970s or the 1980s, and satellite
shots (LANDSAT, SPOT, ASTER) taken during the period 1990-2001. The
referenced framework insured by TNT Mips software has allowed the conducting
of complex spatial and dynamic analyses. Therefore, several generations of maps
at different proportion scales (1:25.000 – 1:200.000) have been used, starting with
Moldavia’s topographical map from 1894 (1:50.000) and ending with the 1996
(1:100.000) edition. The Digital Elevation Model with frames of 20 m
equidistance or even 10 m, in case of rather complex relief, has been elaborated
having as reference the 1:50.000 topographical map re-edited in 1973. By means
of using the DEM, there have been created maps with different pixel dimension
values (100, 50, 30, 10 m). Many other cartographic appliances, representing for
example land use (1:50.000) or soil cover (1:200.000), have also been imported as
vectors.
In the first chapter, the position, limits and general geographical
characteristics of the studied area are being established. ...
....
....
....""
Papers by Mihai Ciprian Margarint
5497 km2) partially overlaps all geographical units comprised by the Moldavian
Plateau: the Suceava Plateau to the west, the Bârlad Plateau to the south and the
Hilly Plain of Jijia in the center, north and east. This area is clearly individualized
by its physical and human geographical particularities, on the level of the natural
relief units, as well as in the contact zones.
The County of Iasi has been so far the object of various studies and
analyses conducted mainly by local geographers, who have only studied its
territory, the entire area of the Carpathian foreland, and rather small natural or
administrative territorial offcuts.
The present work aimes at completing the already existing studies, by
means of tackling numerous geographical problems that may be analysed using
satellite images and the specific spectral responses.
This research paper includes the analysis and interpretation of several
types of images, such as aerial photos from the 1970s or the 1980s, and satellite
shots (LANDSAT, SPOT, ASTER) taken during the period 1990-2001. The
referenced framework insured by TNT Mips software has allowed the conducting
of complex spatial and dynamic analyses. Therefore, several generations of maps
at different proportion scales (1:25.000 – 1:200.000) have been used, starting with
Moldavia’s topographical map from 1894 (1:50.000) and ending with the 1996
(1:100.000) edition. The Digital Elevation Model with frames of 20 m
equidistance or even 10 m, in case of rather complex relief, has been elaborated
having as reference the 1:50.000 topographical map re-edited in 1973. By means
of using the DEM, there have been created maps with different pixel dimension
values (100, 50, 30, 10 m). Many other cartographic appliances, representing for
example land use (1:50.000) or soil cover (1:200.000), have also been imported as
vectors.
In the first chapter, the position, limits and general geographical
characteristics of the studied area are being established. ...
....
....
....""