{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,25]],"date-time":"2026-06-25T19:58:45Z","timestamp":1782417525570,"version":"3.54.5"},"reference-count":9,"publisher":"STEF92 Technology","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2022,11,15]]},"abstract":"<jats:p>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 \ufffdgood ecological status\ufffd, but the Article 4.6 allows temporary deterioration of the status, occurred as a result of so called \ufffdprolonged drought\ufffd. 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 \ufffdsocio \ufffd economic\ufffd drought). The severity of the \ufffdprolonged drought\ufffd 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 \ufffdprolonged droughts\ufffd 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 \ufffd 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.<\/jats:p>","DOI":"10.5593\/sgem2022\/3.1\/s12.07","type":"proceedings-article","created":{"date-parts":[[2023,2,13]],"date-time":"2023-02-13T20:34:51Z","timestamp":1676320491000},"page":"57-64","source":"Crossref","is-referenced-by-count":2,"title":["APPROACH AND INDICATOR SYSTEM FOR ASSESSMENT THE IMPACTS OF RESERVOIRS AND PROLONGED DROUGHT IDENTIFICATION IN BULGARIA FOR WATER FRAMEWORK DIRECTIVE"],"prefix":"10.5593","volume":"22","author":[{"given":"Irena","family":"Ilcheva","sequence":"first","affiliation":[{"name":"National Institute of Meteorology and Hydrology, Bulgarian Academy of Sciences","place":["Bulgaria"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anna","family":"Yordanova","sequence":"additional","affiliation":[{"name":"National Institute of Meteorology and Hydrology, Bulgarian Academy of Sciences","place":["Bulgaria"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lubenova","family":"Lubenova","sequence":"additional","affiliation":[{"name":"National Institute of Meteorology and Hydrology, Bulgarian Academy of Sciences","place":["Bulgaria"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gergana","family":"Drumeva","sequence":"additional","affiliation":[{"name":"National Institute of Meteorology and Hydrology, Bulgarian Academy of Sciences","place":["Bulgaria"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Vesela","family":"Rainova","sequence":"additional","affiliation":[{"name":"National Institute of Meteorology and Hydrology, Bulgarian Academy of Sciences","place":["Bulgaria"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"3602","reference":[{"key":"ref=1","unstructured":"[1] Criteria for determination of reservoir from Appendix 1 of the Water Law as complex and significant, Agreement with the Ministry of Environment and Water, 2015"},{"key":"ref=2","unstructured":"[2] Dimitrov, Y., I. Ilcheva, Application of an indicator system for integrated space-time analysis and drought management in Northwest Bulgaria, XXIX Conference of the Danubian Countries, September 6 \ufffd 7, 2021, Brno, the Czech Republic, 2021"},{"key":"ref=3","unstructured":"[3] Georgieva V., Kazandzhiev, V., Soil drought - degrees and conditions of occurrence. International Conference \"Soil and Agrotechnology in a Changing World\", May 11-15, Sofia, Bulgaria, 2015"},{"key":"ref=4","unstructured":"[4] Guidelines for the use of SRI, SPI3 and SMI indices synchronously and analysis of larger periods of drought; Development of recommendations for interpretation of indicators for assessment of meteorological and hydrological drought, Agreement with the Ministry of Environment and Water, 2021"},{"key":"ref=5","unstructured":"[5] Ilcheva, I., Yordanova, A., Rainova, V., Application of Standardized Status Index for prolonged drought identification and river basin management, International scientific refereed online journal with impact factor, SocioBrains, ISSN 2367-5721, ISSUE 54, ISSN 2367-5721, \ufffd\ufffd.114-122, 2019"},{"key":"ref=6","unstructured":"[6] Ninov, Pl., Karagiozova, Tz., Bojilova, E., Todorova, N., Krumova, K., Dobreva, D., Boeva, R. Ivanova, M. Rankova, Update of the technological scheme for assessment of surface water resources on the territory of Bulgaria, XXVII Conference of the Danubian countries on Hydrological Forecasting and Hydrological bases of water management, Golden Sands, Bulgaria, 2017"},{"key":"ref=7","unstructured":"[7] Monzonis, M., et al., A review of water scarcity and drought indexes in water resources planning and management, Journal of Hydrology, 2015"},{"key":"ref=8","doi-asserted-by":"crossref","unstructured":"[8] Ortega-Gomes T., Perez-Martin M. A., Estrela T., Improvement of the drought indicators system in the Jucar River Basin, Spain, Science of the Total Environment, 1, 276-290, 2018","DOI":"10.1016\/j.scitotenv.2017.07.250"},{"key":"ref=9","unstructured":"[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"}],"event":{"name":"22nd SGEM International Multidisciplinary Scientific GeoConference 2022","theme":"Earth and Planetary Sciences","location":"Albena, BG","acronym":"SGEM2022","number":"22","sponsor":["SGEM WORLD SCIENCE (SWS) Scholarly Society, Austria"],"start":{"date-parts":[[2022,7,4]]},"end":{"date-parts":[[2022,7,10]]}},"container-title":["SGEM International Multidisciplinary Scientific GeoConference\ufffd EXPO Proceedings","22nd SGEM International Multidisciplinary Scientific GeoConference Proceedings 2022, Water Resources. Forest, Marine and Ocean Ecosystems"],"original-title":[],"deposited":{"date-parts":[[2026,6,25]],"date-time":"2026-06-25T19:25:37Z","timestamp":1782415537000},"score":1,"resource":{"primary":{"URL":"https:\/\/epslibrary.at\/items\/212072cb-1059-429c-bd70-1224011fae66\/approach-and-indicator-system-for-assessment-the-impacts-of-reservoirs-and-prolonged-droug"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2022,11,15]]},"references-count":9,"URL":"https:\/\/doi.org\/10.5593\/sgem2022\/3.1\/s12.07","relation":{},"ISSN":["1314-2704"],"issn-type":[{"value":"1314-2704","type":"print"}],"subject":[],"published":{"date-parts":[[2022,11,15]]}}}