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Title: ABOUT THE APPLICABILITY OF ECOLOGICAL FLOW METHODOLOGY FOR PILOT DRAINAGE AREAS IN DANUBE RIVER BASIN DIRECTORATE IN BULGARIA
ABOUT THE APPLICABILITY OF ECOLOGICAL FLOW METHODOLOGY FOR PILOT DRAINAGE AREAS IN DANUBE RIVER BASIN DIRECTORATE IN BULGARIA

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Elena Bojilova; Borislav Vuchkov; Maya Rankova; Plamen Angelov; Radoslava Ivanova
10.5593/sgem2024/3.1/s12.02
10.5593/sgem2024/3.1
1314-2704
978-619-7603-70-5
English
24
3.1
•    Prof. DSc. Oleksandr Trofymchuk, UKRAINE 
•    Prof. Dr. hab. oec. Baiba Rivza, LATVIA
Hydrology and Water Resources
The research uses monthly water flow in river watersheds within Danube’s river basin – Ogosta, Iskar, Yantra and Rusenski Lom rivers, as pilot basins. The water flow indicators describe river flow regime and hydrological streamflow characteristics. Our article describes the determination of environmental flow limits on surface water abstractions in Bulgaria. Monthly river flow is characterized by annual variability due to climate factors and anthropogenic impacts. Furthermore information from hydrometric stations often cannot be used directly and the important tasks of hydrological research is to transfer information from observed river sections to unobserved ones based on the recorded flows from the monitoring network. During the analysis we established spatial relationships between the river flow indicators and the selected physical parameters describing the basin.
Registered flow data in the river gauging stations are executed for the 1981-2019 study period. The main flow indicators are being calculated. For the selected period, there are complete time series of monthly data for most of the stations in the country, ensuring comparability of the results. The regional regression analysis is applied. Three spatial relationships are obtained for three water seasons: high water season, medium water season and low water season.
The paper is illustrated with maps and graphics of the hydrological zones and regional relationships in the selected river systems. The established relationships give the possibilities to interpolate and extrapolate in reasonable range. The reported results are needed for decision makers at different level.
[1] Bozhilova E.K., Application of Methodology for Ecological Flow for Yantra River Basin in Bulgaria, Journal of Balkan Ecology, Vol. 27, № 1, ISSN 1311-0527 (Print) ISSN 2815-3758 (Online), pp 67-78, 2024
[2] Chilikova-Lubomirova M., 2015. Monitoring of the Ecological River Flow in Conditions of Climate Change, Drought and Water Scarcity Conditions, Bulgarian Academy of Sciences, Vol. 3–4, Problems of Geography, Bulgaria, 2015.
[3] Dimitrov Y., Yordanova A., Trends assessment of meteorological factors, river flow and droughts in North-western Bulgaria, E-book with full paper from XXVII Conference of The Danubian Countries, pp 321-330. Bulgaria, ISBN 978-654-90537-2-2, 2017.
[4] Dimitrov Y., Ilcheva I., Application of an Indicator System for Integrated Space-time Analysis and Drought Management in North-western Bulgaria, XXIX Conference of the Danubian Countries, The Czech Republic, Conference Proceedings with Full Papers, ISBN 978-80-7653-031-7, pp 172–180, 2021.
[5] Ilcheva I., Yordanova A., Nikolova K., Estimation of the Impact of Climate and Land Use Changes on the Availability of Water Resources and Drought Risk, International Multidisciplinary Scientific Geo-conference SGEM 2019, Bulgaria, pp 193-200, 2019.
[6] Hristova N., Seymenov K., Annual Flow Dynamics in Large and Small Drainage Basins in Northern Bulgaria during the Last Two Decades, Socio-Brains, ISSN 2367-5721, issue 54, pp 123-131, 2019.
[7] Hristova, N. 2011. Hydrological regime in Bulgaria according to the monthly maxima and minima of runoff. – Fourth International Scientific Conference „Water – problems and solutions”, FMNS–2011, 08–11.06.2011, Blagoevgrad, 627–632.
[8] Ninov, Pl., Karagiozova, Tz., Rankova, M. 2017. Water Resources Determination of Surface Water Bodies at the Bulgarian basin of the Lower Danube, Journal of the Geographical Institute “Jovan Cvijic” SASA, Vol. 67, No 1
[9] Ninov P., Karagiozova T., Monitoring and Investigation of Intermittent Rivers in Bulgaria, E-book of the 28th Conference of the Danubian Countries, Ukraine, pp 6-14, 2019.
[10] Technical Report, Ecological Flow in the Implementation of the Water Framework Directive (086). Guidance Document 31, 2015.
[11] Vasileva T., An Assessment of Potential Ground Water Recharge Zones in Bulgaria, Geological Balcanica, vol. 48(1), Bulgaria, pp 43-61. 2019.
[12] World Bank. Delivering the Water Framework Directive in Bulgaria: Developing a Flows Approach WSP, WSP Environment & Infrastructure Solutions UK Limited, 2022.
[13] Yordanova A., Ilcheva I., Bocheva L., Malcheva K., Lubenova K., Analysis of Hydrological Drought Indices and their Relationship with Meteorological Factors and River Basin Specifics, International Multidisciplinary Scientific Geo-conference SGEM, 10.5593/sgem2022/3.1/s12.05, (3.1), Bulgaria, pp 57-64, 2022.
The paper is based on research project “Determination of the hydrological characteristics according to a developed methodology for determining the ecological runoff for the conditions of Bulgaria and comparison with the values according to the current regulations” with project leader prof. Plamen Ninov. The authors wish to acknowledge the supervision of Eng. Kamelia Krumova for the research concerning Ogosta river basin.
conference
https://doi.org/10.5593/sgem2024/3.1/s12.02
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Proceedings of 24th International Multidisciplinary Scientific GeoConference SGEM 2024
24th International Multidisciplinary Scientific GeoConference SGEM 2024, 01 - 07 July, 2024
Proceedings Paper
STEF92 Technology
International Multidisciplinary Scientific GeoConference Surveying Geology and Mining Ecology Management, 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.
11-18
01 - 07 July, 2024
website
9669
water runoff volume per second, river flow per unit area, ecological flow per unit area

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