Zornitza Cholakova

Zornitza Cholakova
Sofia University "St. Kliment Ohridski" · Department of Landscape Sciences and Environmental Protection

PhD

About

25
Publications
3,115
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33
Citations
Citations since 2016
10 Research Items
23 Citations
201620172018201920202021202201234567
201620172018201920202021202201234567
201620172018201920202021202201234567
201620172018201920202021202201234567

Publications

Publications (25)
Article
Full-text available
Bottom sediments are an element of the complex system of sub-aqual landscapes that have a subordinate position in the landscape-geochemical structure of each territory in terms of migration and concentration of chemical elements and their compounds. The objects of this study are the river bottom sediments of two of the large tributaries of the Iska...
Article
Full-text available
The article is dedicated to a scientist who has contributed to the establishment and development of landscape science in Bulgaria. Associate Professor PhD Mimoza Konteva worked in the Department of Landscape Ecology and Environmental Protection at the Faculty of Geology and Geography at Sofia University “St. Kliment Ohridski” throughout her whole s...
Chapter
Full-text available
The study is focused on the karst landscapes within the scope of the Besaparski ridges. The specifics concerning the part of the ridges are studied, which are characterized by the presence and running of karst processes. An analysis of the natural components in the investigated territory was made. The role of natural components in landscape differe...
Book
Full-text available
This study was prepared within the project “Just Transition in Eastern and Southern Europe.” The “Just Transition in Eastern and Southern Europe” project is funded by the European Climate Initiative Program (EUKI). EUKI is a financial instrument of the Federal Ministry for the Environment, Nature Conservation and Nuclear Safety of the Federal Repub...
Book
Full-text available
This study was prepared within the project “Just Transition in Eastern and Southern Europe.” The “Just Transition in Eastern and Southern Europe” project is funded by the European Climate Initiative Program (EUKI). EUKI is a financial instrument of the Federal Ministry for the Environment, Nature Conservation and Nuclear Safety of the Federal Repub...
Book
Full-text available
This study was prepared within the project “Just Transition in Eastern and Southern Europe.” The “Just Transition in Eastern and Southern Europe” project is funded by the European Climate Initiative Program (EUKI). EUKI is a financial instrument of the Federal Ministry for the Environment, Nature Conservation and Nuclear Safety of the Federal Repub...
Article
Full-text available
The essence of karst landscapes is considered. The content of Cu, Zn, Pb, Cr, Ni, Co, Mn, Cd trace elements in the soils of karst landscapes in the Ponor, Vrachanska and Vlahina Mountains, as well as those in The Western and Middle Fore-Balkan (Arbanassi Plateau), Bulgaria, is analyzed using landscape-geochemical, laboratory, mathematical and stati...
Article
Full-text available
Arsenic (As) is a toxic element which can occur in increased concentrations mainly in areas affected by mining and ore processing activities. To assess the As fractionation in soils from the Ogosta River floodplain, a seven-step sequential extraction procedure (SEP) followed by As determination using ultrasonic nebulization inductively coupled plas...
Article
Full-text available
Landscapes of Maleshevska mountain have formed as a result of geographic location and specific mezoclimate. Their particularity is determined by the geological foundation and specific lithology. According to that, the anthropogenic influence is more important than others landscape forming components. Therefore, natural landscapes occupy limited are...
Article
Full-text available
The article analyzes distribution of the trace elements content (Cu, Pb, Co, Zn, Mn, Ni, Cr, As-heavy metals and metalloids) in the river channel sediments of Kopilovska, Slatinska and Dalgodelska Ogosta Rivers. The history of gold mining and lithogeochemical speciality of the river catchment are investigated. The results are compared to European g...
Conference Paper
Full-text available
Abstract: This study investigates the karst landscapes characteristics in the western part of Mala Mountain – Kamaka hill, within a north-south profile-transect. It is located on the southern slope of Kamaka, northeast of Bistrets karst spring. The paper describes and analyzes the main surface karst forms on the basis of printed and archive materia...
Conference Paper
This study investigates the karst landscapes characteristics in the western part of Mala Mountain-Kamaka hill, within a north-south profile-transect. It is located on the southern slope of Kamaka, northeast of Bistrets karst spring. The paper describes and analyzes the main surface karst forms on the basis of printed and archive materials, and as a...
Article
Full-text available
The article presents the results of the microelements-heavy metals (Cu, Zn, Pb, Mn, Cd, Co, Cr, Ni) concentration and differentiation study in the rock formations, soils, rivers bottom sediments and water of Lom river basin in West Balkan and West Forebalkan mountains. The results are compared with average data for background and technogenic region...
Article
Full-text available
Современные ландшафты южной части горы Влахина образовались под влиянием основных природных факторов – геологического строения с различной литологией и тектонического развития; особенностей климата и формированием специфического мезоклимата. Большое значение приобретает антропогенный фактор. Сделано крупномасштабное картографирование ландшафтов в М...
Conference Paper
Full-text available
The Chiprovtsi area is polluted with arsenic and heavy metals as consequence of past mining activity. Analysis of surface waters yielded a range of Pb concentrations from <2 to 6 µg/l, of Zn – from <2 to 56 µg/l, of Cu – from <1 to 6 µg/l. As-concentrations vary from under the detection limit to 437 µg/l. The sequential extraction procedure of stre...
Conference Paper
Full-text available
The current research aims to clarify the structure, dynamics and functioning of the natural and anthropogenic landscapes in Berkovska and Koznitza mountains. Throughout the course of work have been determined some of the geoecological problems of these mountainous areas resulting from the landuse, as well as the landscape modifications that had occ...
Article
Full-text available
The Chiprovtsi mining area is contaminated as a consequence of past mining. The 20-year existing of Goliam Bukovets mine tailings impoundment has affected all elements of its surroundings. As a result elevated concentrations of arsenic and heavy metals in upper soil layers and in grass are established. The low distributions of arsenic and heavy met...
Article
Full-text available
Investigation on the copper (Cu), lead (Pb), cadmium (Cd), zink (Zn) and arsenic (As) concentrations in the Malki Iskar River bottom and floodplain sediments was conducted in 2004 at lower water stage and in 2005 at high flood levels. Higher heavy metal contents in the river sediments and intensive contaminant dispersal along the main river were ob...
Conference Paper
Full-text available
ABSTRACT This paper aims at researching the contemporaneous geo-ecologic state and the structure of both wildlife and man-made landscapes in Gaber kettle. Consequently, a map of the contemporary landscapes has been created (scale 1:25 000). Geo-ecologic state of wildlife and man-made landscapes has been investigated by taking soil, water samples a...
Article
Full-text available
Chiprovtsi silver-lead and Martinovo iron mines represent the biggest mining area in Northwestern Bulgaria, which was operated till 1999. Their long-lived operation leads to proved pollution of the environment in the vicinity of the mines, especially water and soil. Seasonal monitoring of heavy metal (Cu, Zn, Cd and Pb) and metalloid (As and Sb) co...
Conference Paper
Full-text available
Current paper represents partly the results of a complex investigation on Chiprovska River catchment area after ceasing the activity of ore-extracting enterprise “Chiprovets” Ltd. Concentration trends of the heavy metals Pb, Cu, Zn, Cd, as well as of the metalloid As have been exhibited on the head river and its basic tributaries. These appear to b...
Article
Full-text available
This paper aims at representing the pollution with heavy metals (Cu, Pb, Zn, Cd, Mn, Ni, Cr, Co) of the channel sediments of the Iskar River basin and its tributaries within the borders of the Balkan Mountain. Part of the river course after the no-longer functioning metallurgical factory has several times higher concentrations of Cu, Zn, Рb, Сd and...

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