Rosen Nankin

• Magister
• Engineer at Geological Institute Bulgarian Academy of Sciences

With this study, we are launching a project "Geological risk assessment on rock cultural monuments on the territory of the Eastern Rhodopes" supported by the Bulgarian National Science Fund (2025–2027). The project aims to develop a methodology for assessing the geological risks threatening the rock cultural monuments in the Eastern Rhodopes, Bulga...

The present study examines the change in landslide susceptibility under climate change conditions. The Landslide Susceptibility Index for the territory of Bulgaria was determined using the Mora and Vahrson method, based on the weighted assessment of various adverse conditions and destabilizing factors on slope stability. The input data include prec...

The common historical background between geology and medicine is rich in research opportunities, so the current scientific development in the field can prove to be both a useful resource and an incentive for further research and development. The main task of medical geology is to study the impact of the geological environment and related processes...

In recent years, society become much more interested in nature disasters that cause damage. The consequences of these destructive processes of a meteorological, hydrological and geological nature sometimes remain for years until the affected areas are recultivated, restored and recovered. These natural processes work together, often following each...

The medieval fortress Asenova Krepost (Asen’s Fortress) is built on a rocky massif of metamorphic rocks in south-central Bulgaria. The rock hill, on which the fortress was built, stands about 100 m above the Chepelarska River and the road Asenovgrad–Bachkovo Monastery, which passes at the foot of the slope. The slopes of the hill are steep and over...

As part of the Reimbursable Advisory Services on Accelerating Resilience to Disaster Risks, the World Bank worked with the Interior Ministry of Bulgaria to develop a proposal for the National Disaster Risk Profile of Bulgaria. The purpose of this document, which is the fourth technical annex to the proposal for the National Disaster Risk Profile, i...

The study covers a coastal slope along the northern Bulgarian Black Sea coast near Cape Kaliakra, Zelenka locality. The slope is composed of Miocene (Sarmatian), unconsolidated aragonite sediments with limestone interbeds (Topola Formation) and a steep limestone rock ridge (Karvuna Formation). Water flows along the surface of the slope, attached to...

This paper presents the changes in physical and mechanical parameters of fresh granodiorites from the Plana pluton after freezing. Laboratory studies were carried out to evaluate the properties of the granodiorites, such as determining the strength, density and water absorption of the rock material. A total of 39 samples at various weathering grade...

An assessment of the landslide risk (Rls) for the territory of Bulgaria by administrative districts has been made by combining the vulnerability (V) and landslide hazard (Hls) maps. Landslides are a significant part of geological hazards and are widespread throughout the country. In order to assess the landslide risk for the territory of Bulgaria,...

This article aims to present the results of geotechnical studies of the main rock complexes that compose the periphery of the Dobrudzha Plateau in the area from Cape Kaliakra to Cape Shabla (Bulgarian Black Sea Coast), directly related to the development of hazardous geological processes. Sediments of the Sarmatian age were studied: carbonate tempe...

This study presents the results of 227 tested specimens of the Sarmatian age taken from the rock complexes that build Kaliakra Cape: these are carbonate tempestites, as well as the limestones from the Karvuna Formation lying above them. Sedimentological and geotechnical tests have been performed. The micropetrographic analysis of the carbonate temp...

The main characteristics of an active landslide located before the Thracian Cliffs golf club, SW of the village of Bozhurets (Northern Bulgarian Black Sea Coast) are considered. The results of the field studies for the landslide activity for the period 2018–2020 are presented. Physical and mechanical parameters of samples from the landslide toe are...

The territorial distribution of landslides along the Northern Bulgarian Black Sea coast has been evaluated by analyzing the results of field surveys for 2018 and 2019 based on geological surveys and processing of interferometric images from synthesized aperture radars (SAR). A local image archive of Sentinel-1A / B was created for the period 2015 -...

The territory of Bulgaria has a high degree of landslide hazard with possible economic losses, social and environmental consequences. The Landslides are widespread throughout the country’s territory. They form the most serious part of the geological hazard in Bulgaria. The main factors for landslide activity (rainfall, impact of surface and ground...

The Bulgarian Black Sea coast is a region where a considerable part of the deep complex landslides in the country are distributed. More than 200 landslides affect only urban areas, resorts and villa zones. Depending on the depth range, geological and tectonical structure and the engineering geological properties of the geological units, the Bulgari...

The study covers the coastal slope in the Zelenka locality (northern Bulgarian Black Sea coast). This is a beautiful but also dangerous area due to constant sloping and falling of huge blocks of land on the shore. The slope is composed of Miocene sediments: diatomaceous clays (Euxinograd Formation), unconsolidated aragonite sediments with limestone...

The main purpose of this investigation is to clarify the engineering and hydrogeological conditions in the Chepinska valley area in connection with the extension of the graveyard park of the town of Velingrad. During the designing of new cemeteries, it is necessary to take into account the engineering and hydrogeological conditions of the area in w...

The studied area is located in the southeast parts of the Plana Mountain. It is built up of Plana diorite pluton, represented by granodiorites, quartz-diorites and quartz-monzonites, which is located among the older (Precambrian) metamorphic rocks (gneisses, amphibolites, schists and fillites). Plana Pluton is part of Tsentralnosrednogorska magmati...

The area around Topola Village is affected by landslide processes, which are the major factor in the formation of the modern relief. The terrains affected by the landslides are manly composed of sediments of the Topola Formation. In the engineering-geological studies carried out in the region, main attention was paid to the geotechnical parameters...

The problems related to rock slope stability of excavations realized in differing in genesis rock complexes are the object of the present paper. The stability of these slopes depends on the natural fracture system in the massif, the additional fracture systems occurring in the rock masses during the excavation works as well as on the resistance aga...

The present paper aims to analyse and to discuss the state of landslide problems in Bulgaria. It separates the main factors of instability of slopes Bulgarian landslides: tectonic movements, earthquakes, erosion, abrasion, surface water and groundwater, precipitation and human impact. Landslides are concentrated in certain regions: Black Sea Coast,...

The Northern Bulgarian Black Sea coast is about 100 km strip that almost along its entire length is affected by landslides. Тhese landslides are irregularly distributed in four landslide areas. Most of the landslides are complex and deep-seated. The present article analyses the old and recent sliding phenomena along the coastal zone in this part of...

The paper considers the results from the investigations of a team of the geological institute of the Bulgarian academy of Sciences in the Batova river valley (Balchik municipality) related with the expansion of construction. The geomorphological and geological conditions in the valley are studied and an engineering geological zoning is performed. T...

The necessity of contemporary assessment of the natural hazardous processes on the territory of Bulgaria leading to disastrous and catastrophic situations in a number of regions is motivated by their high activity resulting in destruction of building fund, infrastructure, historical