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Title: IDENTIFICATION OF TYPE-SPECIFIC REFERENCE HYDROMORPHOLOGICAL CONDITIONS OF BULGARIAN COASTAL WATERS IN SUPPORT TO MARINE ENVIRONMENTAL MANAGEMENT
IDENTIFICATION OF TYPE-SPECIFIC REFERENCE HYDROMORPHOLOGICAL CONDITIONS OF BULGARIAN COASTAL WATERS IN SUPPORT TO MARINE ENVIRONMENTAL MANAGEMENT

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Nikolay Valchev; Bogdan Prodanov; Lyubomir Dimitrov; Nataliya Andreeva; Todor Lambev; Petya Eftimova
10.5593/sgem2023/3.1/s12.09
10.5593/sgem2023/3.1
1314-2704
978-619-7603-58-3
English
23
3.1
•    Prof. DSc. Oleksandr Trofymchuk, UKRAINE 
•    Prof. Dr. hab. oec. Baiba Rivza, LATVIA
Hydrology and Water Resources
Water and sediments in coastal areas interact at different scales, thus shaping the marine environment and providing physical habitat for ecosystems. Hence, the hydromorphological conditions represent a key aspect of aquatic ecosystems considered in the Water Framework Directive as supporting quality elements (alongside the physicochemical), which are expected to provide the boundary conditions for the biological quality elements. Any alteration in those can reshape the corresponding biological conditions at various spatial and time scales. The Directive states that coastal waters might be subdivided considering significant changes in bathymetry, substrate, or exposure.
Typologies established by the Directive should reflect the natural variability in hydromorphological characteristics and processes. Therefore, the aim of the present study is to establish the type-specific hydromorphological reference conditions by identifying areas within water bodies that are relatively homogeneous from a hydromorphological point of view in order to better serve both determination and management of environmental state and designation of highly modified coastal waters based on a set of clear quantitative criteria.
The data employed comprise remote bathymetry measurements, sediment mapping and wave exposure type. These layers were geospatially analysed to differentiate aquatic areas of similar hydromorphological conditions. About 100 such areas were delineated, in which conditions could be considered reference. At the same time, analysis revealed eighteen modified smaller scale areas, within the above-mentioned ones, which are considered hotspots of hydromorphological change in anthropogenically modified environment; hence, an object of future monitoring and specific management actions.
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The study has been performed within the project “Coastal HYdro-Morphological Regime changes in mAn-modified environment – CHYMERA”, contract No КП-06- Н54/8/01.12.2021 funded by the Bulgarian National Science Fund under the Ministry of Education and Science of the Republic of Bulgaria.
The sediment map of Burgas Bay was developed under the research project „Multidisciplinary study of Burgas Bay – MidBay (Composition of a detailed digital model of the bottom relief with analysis of modern geomorphological conditions and archaeological forecasting modelling)“, funded by the Bulgarian National Science Fund, Contract № КП-06-Н34-7/2019.
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https://doi.org/10.5593/sgem2023/3.1/s12.09
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Proceedings of 23rd International Multidisciplinary Scientific GeoConference SGEM 2023
23rd International Multidisciplinary Scientific GeoConference SGEM 2023, 03 - 09 July, 2023
Proceedings Paper
STEF92 Technology
International Multidisciplinary Scientific GeoConference SGEM
SWS Scholarly Society; Acad Sci Czech Republ; Latvian Acad Sci; Polish Acad Sci; Russian Acad Sci; Serbian Acad Sci and Arts; Natl Acad Sci Ukraine; Natl Acad Sci Armenia; Sci Council Japan; European Acad Sci, Arts and Letters; Acad Fine Arts Zagreb Croatia; Croatian Acad Sci and Arts; Acad Sci Moldova; Montenegrin Acad Sci and Arts; Georgian Acad Sci; Acad Fine Arts and Design Bratislava; Russian Acad Arts; Turkish Acad Sci.
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03 - 09 July, 2023
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Water Framework Directive, hydromorphological quality elements, water depth, wave exposure, bottom substrate type