Olimpiu PopBabeş-Bolyai University | UBB · Laboratory of Dendrochronology - Faculty of Geography
Olimpiu Pop
PhD Lecturer
About
48
Publications
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162
Citations
Citations since 2017
Introduction
Olimpiu Pop currently works at the Faculty of Geography, Babeş-Bolyai University. Olimpiu does research in Geomorphology and Biogeography. His research activities are mainly oriented toward the study of the natural/anthropogenic hazards and their influence on tree-growth/forest dynamics in mountain areas.
Publications
Publications (48)
We reconstruct snow-avalanche (SA) activity along three adjacent avalanche paths in the northern part of the Rodna Mountains (Eastern Carpathians, Romania) using tree-ring analyses. We sampled a total of 238 disturbed Norway spruce (Picea abies (L.) Karst.) trees and used the growth anomalies found in tree rings to obtain an avalanche chronology at...
This paper explores the snow-avalanche regime based on tree-ring reconstructions and their triggering weather conditions with classification tree algorithms.
The results show a significant increased frequency of avalanche events on Zăvoaie NE slope for the second half of the 20th century by comparison to the Scărița SW slope. The classification tre...
Vegetation is an important ecological indicator of rock glaciers' activity as its development marks the transition from active to inactive and relict states. Most rock glaciers in Retezat Massif are covered by vegetation, mostly Pinus mugo shrubs but also herbaceous and forestry vegetation. In this paper, 82 rock glaciers from Retezat are classifie...
The degradation of forest ecosystems represents a severe environmental issue in anthropogenically modified landscapes worldwide. We demonstrated the negative impact of contaminated debris flow deposits on riparian forest in the Romanian Carpathians through the innovative combination of several dendroecological approaches. Reconstruction of debris f...
Global warming is causing glaciers in the Caucasus Mountains and around the world to lose mass at an accelerated pace. As a result of this rapid retreat, significant parts of the glacierized surface area can be covered with debris deposits, often making them indistinguishable from the surrounding land surface by optical remote-sensing systems. Here...
Denudation and land cover change are of high relevance for Earth surface and landscape dynamics and the transfer of solutes and sediments from headwater systems through main stem of drainage basin systems to the world oceans. Denudational hillslope and fluvial processes, associated source-to-sink fluxes and sedimentary budgets are controlled by a r...
Snow avalanches are a common phenomenon in Parâng Mountains (Southern Carpathians, Romania) perturbing tourism activities and associated infrastructures, damaging forests, and causing fatalities. Its past history is an essential information to gather while assessing the hazard zonation areas. Usually, in Romania snow–avalanche activity occurring...
The Mazeri Valley in the southern Caucasus Mountains, Georgia, is characterized by a highly dynamic landscape with several active mass-wasting processes. The spatial and temporal dynamics of these geomorphic processes have, over time, resulted in the formation of large cones and fans. In this context, the coupling between the hillslope and the chan...
Résumé : Les avalanches de neige représentent un aléa majeur sur les versants pentus des Monts Maramureş (Carpates Orientales Roumaines), mais reste très peu connu dans ces montagnes. En l’absence des sources documentaires d’information sur l’activité avalancheuse dans le passé, on peut recourir à des sources indirectes d’information, comme par exe...
Since the end of the Little Ice Age (LIA) glacial advance, mountain glaciers of temperate zone have experienced an accelerated retreat accompanied by an increased production, transport and accumulation of glacial sediments. In these deglacierized areas, the development of a chronology for sediment deposition in the glacier forefronts remains challe...
This Special Issueon Drivers of denudation rates, source-to-sink fluxes, and sedimentary budgets produced by the I.A.G./A.I.G. SEDIBUD group (http://www.geomorph.org/sedibud-working-group/) includes selected paper contributions from the 11thWorkshop Relationships between climate change, vegetation cover and sediment fluxes in high-latitude/high-alt...
The return period is a key element used for snow-avalanche characterization. To calculate the return period, historical data regarding past snow-avalanche activity are required. In mountain areas where past snow avalanches are poorly documented, dendrogeomorphic approaches constitute a reliable method for the reconstruction of past snow avalanches...
Snow avalanches are some of the most important geomorphic processes that disturb the forests at treeline in the Romanian Carpathians. The occurrence of multiple snow avalanches in the same area leads to the development of the avalanche paths. In Parâng Mountains, the spatial extent and the frequency of past avalanche events are poorly documented. I...
Dans notre étude, nous avons mis en relation les données dendrochronologiques avec 50 variables climatiques mensuelles (1961 - 2015) en utilisant la régression multiple. Le couloir d’avalanches investigué est situé dans la partie ouest des Monts Parâng (Carpates Méridionales, Roumanie), à proximité de la station météorologique Parângul Mic. A parti...
Snow avalanches are widespread process in high massifs belonging to Romanian Carpathians range. The sudden and unpredictable occurrence of snow avalanches cause damage to forest vegetation, infrastructures, transportation roads and sometimes loss of life. Understanding the process activity is therefore crucial for hazard prediction and mitigation m...
Tree-ring analyses were applied in this study, in order to document the spatial–temporal distribution of the past snow avalanche activity along two adjacent avalanche paths in Piatra Craiului Mountains (Southern Carpathians, Romania). The dendrogeomorphic reconstruction performed on 235 Picea abies (L.) Karst. trees is based on the analysis of the...
Ground and air temperature monitoring, geophysical soundings and dendrological investigations were applied to a basaltic talus slope–rock glacier system from Detunata site in the Apuseni Mountains (Western Romanian Carpathians) to verify the presence of sporadic permafrost at 1020–1110 m asl, well below the regional limit of mountain permafrost. Th...
Snow avalanches represent a widespread phenomenon in the Carpathians, damaging forests, properties, infrastructures and causing fatalities. In remote mountain areas, historical records of snow avalanche activity are commonly lacking. Trees repeatedly disturbed by snow avalanches record evidence of past events in their annual rings. The main purpose...
Debris flows (DF) are one of the dominant geomorphic processes and play an important role in the present-day morphodynamics of the steep slopes and stream channels in the Romanian Carpathians. A large number of studies describe the characteristics, dynamics, and site occurrence of various types of active present-day mass movement processes affectin...
Snow avalanches are common processes on steep slopes of the alpine and subalpine belts in Parâng Mountains (Southern Carpathians, Romania). The increasing tourism activities in these high mountain areas expose tourists to a high level of hazard especially in the avalanche prone areas, where the past avalanche activity is poorly documented. Snow ava...
Recent evidence suggests an acceleration of the glacier retreat in the Greater Caucasus after 1980. A significant summer temperature warming trend and little or no change in precipitation variation have been observed during the same period. This study aims to find similar past climatic conditions after the Little Ice Age (LIA) using a dendroclimati...
Debris floods commonly affect remote mountain areas by damaging the existing infrastructure. It is therefore important to identify and map the hazards related to this hydrogeomorphic process, to include it in the planning policies and decision-making process. Because remote mountain areas are rarely long-term monitored, the data regarding past debr...
The deep-seated landslides (glimee) have played an important role in the evolution of the landscape in Transylvania. In Romania the study of the landslides were focused principally on the morphology, the spatial distribution and the influence of human activities on the morphology and on the origin of landslides. Through the radiocarbon dating of th...
The spoil heaps of the sulphur mines of the Negoiul Românesc volcanic cone are intensely reworked by mass movement processes which not only lead to severe sedimentation in downstream rivers, but also to the toxification of riparian Norway spruce (Picea abies (L.) Karst.) forests. Along the lateral borders of the Dumitrelul retention basin, recent s...
ABSTRACT. - Snow Avalanche Activity in Parâng Ski Area Revealed by Tree-Rings.
Snow avalanches hold favorable conditions to manifest in Parâng Mountains, but only one
event is historically known, without destructive impact upon infrastructure or fatalities and
this region wasn’t yet the object of avalanche research. The existing ski infrastructure...
The geomorphological evidences along with the range of methods recently (since 2008) applied in the Romanian Carpathians indicate that most of the rock glaciers are relict or inactive in the present. Only a few cases of active or complex rock glaciers (active only across their upper parts) are supposed to exist in the highest granitic massifs of So...
A significant summer temperature warming trend and little or no change in precipitation variation have been observed in the southern part of the Carpathians after 1980. In this paper we seek to find similar past climatic conditions using a dendroclimatic reconstruction of summer temperatures. Regional dendroclimatic reconstruction has been conducte...
Recent evidence suggests an acceleration of glacier retreat in Greater Caucasus after 1980. For the same period a significant summer temperature warming trend and little or no change in precipitation variation have been observed. In this paper we seek to find similar past climatic conditions using a dendroclimatic reconstruction of summer temperatu...
Parâng Mountains belong to Southern Carpathians, having the maximum altitude in Parângul Mare Peak (2519 m a.s.l.). The geology is dominated by crystalline schists, due to whom the relief is characterized by steep slopes. Between 1400 – 1700 m the average annual temperature is around 2-3ᴼC and the total precipitation about 1000-1200 mm/year. Conife...
Mining activities cause heavy metal pollution of the water, the soil and the air in the affected areas. Metal toxicity, acidic pH and changes in soil structure are supposed to induce a stress on the riparian forest. Coniferous trees affected by this type of human-induced environmental stress react by producing different anatomical changes, commonly...
The deep-seated landslides (glimee) have played an important role in the evolution of the Transylvanian landscape, causing the reshaping of the slopes. Previous research indicates that the triggering moment of this landslide began during the Late Glacial Period or even in the Eemian Period. Although contemporary geomorphologic processes affect the...
The waste dumps of the sulphur mines of the Negoiul Românesc volcanic cone (C
̆
alimani Massif, Romania, 2100
m a.s.l.) are intensely reworked by poor intense geomorphic processes (e.g., flows, slides, and falls) out of the
poorly consolidated deposits. These processes affect a Norway spruce (Picea abies (L.) Karst.) forest located
between 1700 and...
Between the 1970s and the 1990s, the intense sulphur mining activity created specific landforms (quarries,
waste dumps, dams, tailing ponds, etc.) in the central part of the Calimani Mountains (Romania). The newly created waste dumps are today intensely affected by geomorphic processes such as landslides, debris-flow and hyperconcentrated flows. Th...
The EuroDendro project (2009-2010) associates French, Icelandic, Norwegian and Romanian researchers to analyse the recurrence of geomorphic dynamics occurring on slopes with a dendrogeomorphological approach. Study sites are located in France (Auvergne), Iceland (Northwestern and Northern Iceland), Norway (Nordfjord) and Romania (South Carpaths Mou...
L'atelier intitulé "Dendrogéomorphologie et dendroclimatologie – méthodes de reconstitution des milieux géomorphologiques et climatiques des régions montagneuses" a eu lieu à Cluj-Napoca
le 27-29 juillet 2009. Il a réunit des chercheurs des domaines divers (géomorphologie, climatologie, dendrogéomorphologie et dendro-climatologie) autour des débat...
Le paysage géographique transylvain a été analysé par la multitude de variables
naturelles et anthropiques qui définissent sa fonctionnalité. La relation
substrat – environnement hydro-athmosphérique – communauté anthropique
ou biologique a réclamé une méthodologie d’investigation spécifique, avec un
caractère interdisciplinaire. La méthodologie d’...
Hiking trail erosion and rehabilitation in the Sancy Massif (French Central Massif). In the Sancy Massif (French Central Massif), the tourism-related activities (hiking, skiing, biking, etc.) have become a threat to the morphological stability of the slopes. On the massif's ridges, the volcanic rocks (lava flows, pyroclastic deposits, etc.) and the...
Projects
Projects (2)
L'école d'été doctorale intitulée "Méthodes dendrochronologiques, d'analyse des palynomorphes et documentaires utilisées dans la reconstitution des changements climatiques et environnementaux" vise à offrir un cadre approprié de rassemblement et d’échange d’idées entre doctorants et chercheurs ayant un intérêt particulier pour la reconstitution des conditions climatiques et environnementales. L’école d’été doctorale offre l’opportunité de discuter sur de diverses méthodes appliquées dans la reconstitution de la variabilité climatique et des changements environnementaux (dendrochronologie, analyse des palynomorphes, documents cartographiques historiques et photographies aériennes) , en insistant tant sur les possibilités que celles-ci offrent, mais aussi sur leurs limites dans la reconstitution spatio-temporelle des événements.
Organisateurs :
• Université Babeş-Bolyai, Faculté de Géographie, Cluj-Napoca :
Ecole Doctorale Géographie (Géographie Physique et Environnement) Laboratoire de Dendrochronologie (GeoDendroLab)
• Agence Universitaire de la Francophonie (AUF), Bureau Europe Centrale et Orientale (BECO)
• Association Roumaine des Géomorphologues (AGR)
Station de Recherche de l’UBB,
Baru (département Hunedoara, Roumanie)
10 - 14 septembre 2017
L’objectif général du projet est d’élaborer les cartes des aléas géomorphologiques des espaces avec activité et infrastructure touristiques des Massifs du Parâng (Roumanie) et Pirin (Bulgarie). Des méthodes et techniques de recherche spécifiques à la télédétection, aux SIG, à la dendrogéomorphologie et à la cartographie géomorphologique numérisée seront utilisés. Les résultats escomptés du projet auront un impact sur le plan scientifique constituant une méthodologie de zonage des aléas géomorphologiques applicable dans la construction de toute carte des aléas géomorphologiques des autres régions de haute montagne.
