Zvezdelina Marcheva- Phd
- PhD at Bulgarian Academy of Sciences
Zvezdelina Marcheva
- Phd
- PhD at Bulgarian Academy of Sciences
About
8
Publications
1,048
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
13
Citations
Introduction
Current institution
Publications
Publications (8)
Abstract. This study investigates the seasonal variation of dissolved oxygen (DO) concentrations in urbanized rivers, with a focus on the
Vladayska River in Sofia, and examines key influencing factors such as temperature, biological oxygen demand (BOD5), chemical oxygen demand
(COD), precipitation and river runoff. The waters of the Vladayska River...
River water quality is one of the current topics of theoretical and applied hydrology, ecological and urban hydrology, and one of the main problems in the planning and management of water resources. The chemical, physical, and biological characteristics of surface water, based on standards for its use, are related to human health, food production,...
This study aims to reveal the arsenic dynamics in groundwater of а river floodplain contaminated with mine tailings under temperate climate conditions and natural river hydrodynamics. Arsenic concentrations were monitored in the primary morphological units of the floodplain in the upper stretch of the Ogosta River in NW Bulgaria. Iron, lead-silver,...
The monitoring system in the Ogosta River valley is specifically designed to investigate the dependence of spatial distribution of arsenic in groundwater on the environmental settings of a floodplain which is contaminated with sulphides from mine tailings. The location of 25 piezometers takes into consideration the geomorphological features of the...
The purpose of this study is to categorise 21 groundwater monitoring points in the mining-affected valley of the Ogosta River in Northwestern Bulgaria according to the conditions for arsenic contamination of the alluvial aquifer. The grouping of the sites has been performed based on geochemical and geographical indicators using cluster analysis. Re...
The mapping of ecosystem services is essential for understanding how ecosystems contribute to human wellbeing. The EU Biodiversity Strategy to 2020 requires the member states to map and assess the state of ecosystems and their services. Urban landscapes provide various services and their mapping necessitates prioritization, integration of data and...
The paper presents an algorithm for modeling the vertical water transport of arsenic (As) in contaminated river floodplain deposits using the software product HYDRUS-1D. A scenario of river flooding is prepared with sample data from a model plot in the Ogosta River valley, northwestern Bulgaria. Meteorological and hydrological data were also used f...
HYDRUS-1D. Представен е сценарий на речно заливане с примерни данни от изследван участък в долината на р. Огоста между с. Белимел и яз. "Огоста". Резултатите от симулациите показват значимата роля на речните разливи за постъпването на арсен от замърсените почвени пластове към подземните води. Ключови думи: HYDRUS-1D, разливи, подземни води, монитор...
