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Title: APPROACH AND INDICATOR SYSTEM FOR ASSESSMENT THE IMPACTS OF RESERVOIRS AND PROLONGED DROUGHT IDENTIFICATION IN BULGARIA FOR WATER FRAMEWORK DIRECTIVE
APPROACH AND INDICATOR SYSTEM FOR ASSESSMENT THE IMPACTS OF RESERVOIRS AND PROLONGED DROUGHT IDENTIFICATION IN BULGARIA FOR WATER FRAMEWORK DIRECTIVE

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Irena Ilcheva; Anna Yordanova; Krasimira Lubenova; Gergana Drumeva; Vesela Rainova
10.5593/sgem2022/3.1/s12.07
10.5593/sgem2022/3.1
1314-2704
978-619-7603-42-2
English
22
3.1
•    Prof. DSc. Oleksandr Trofymchuk, UKRAINE 
•    Prof. Dr. hab. oec. Baiba Rivza, LATVIA
Hydrology and Water Resources
Drought indicator systems help decision-makers to understand how and where the drought occurred and to take measures from the Drought Management Plans. The main goal in the Water Framework Directive (WFD) is the achievement “good ecological status”, but the Article 4.6 allows temporary deterioration of the status, occurred as a result of so called “prolonged drought”. Reduction of natural water resources such as rivers, lakes, aquifers, is associated with the reduction in available water resources for water supply, environment, etc. (so called “socio – economic” drought). The severity of the “prolonged drought” is related to its duration, specificities of the river basin, reservoir management and impacts. The research is related to the system of drought indicators developed in NIMH (http://hydro.bg: Standardized Runoff Index, SRI; Standardized Precipitation Index, SPI; Soil Moisture Index, SMI) and its improvement at River Basin level. A new approach for integrated analysis of the indices of the NIMH system, the indicators used by the Ministry of Environment and Water (MoEW) - inflow and levels of reservoirs, groundwater, etc., has been developed. Thus, from the first months, the so-called hot spots and critical areas are identified - reservoirs, watersheds and river basins for which drought indicators identify drought and/or whose regulatory capabilities have declining potential and are at risk in the event of prolonged drought. Emphasis is placed on those hot spots where the precipitation deficit takes place in the reservoir watersheds. A system of criteria and drought indicators to identify “prolonged droughts” have been experimentally applied. A joint analysis of the SRI, SPI, SMI maps (http://hydro.bg), the developed maps for inflow and volume of complex and significant reservoirs from Annex 1 of the Water Act, etc., was performed. For assessment of the indicators for the reservoir inflow a scale of inflow used by the MoEW is proposed. For the indicator available volume, experiments with the Percent from reservoir capacity, Standardized Status Index, etc., were conducted. Drought periods in Bulgaria are analyzed, especially prolonged drought 2019 – 2020. The approach supports the operational application of the NIMH drought indicator system in the practice of the MoEW and the Drought Management Plans realization.
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[9] Prolonged drought towards a common understanding of the phenomenon and of its impacts, Document produced by the expert network on water scarcity and drought, WS&D Expert Network, Current state of play in august 2007
[10] Santurdjian, O., et al., Development of rules for management of reservoirs from Annex 1 to the Water Act, the Agreement with the Ministry of Environment and Water, 2019 - 2022, for dams: "Zhrebchevo", "Studena", "Koprinka", "Ticha" "Kamchia", etc.
The study is part of a scientific project implemented with the support of the Agreement with the Ministry of Environment and Water for 2021
conference
https://doi.org/10.5593/sgem2022/3.1/s12.07
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Proceedings of 22nd International Multidisciplinary Scientific GeoConference SGEM 2022
22nd International Multidisciplinary Scientific GeoConference SGEM 2022, 04 - 10 July, 2022
Proceedings Paper
STEF92 Technology
International Multidisciplinary Scientific GeoConference SGEM
SWS Scholarly Society; Acad Sci Czech Republ; Latvian Acad Sci; Polish 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; Turkish Acad Sci.
57-64
04 - 10 July, 2022
website
8526
prolonged drought, Drought indicator systems, Drought Management Plans, WFD, ecological status