Scholarly record
APPROACH AND INDICATOR SYSTEM FOR ASSESSMENT THE IMPACTS OF RESERVOIRS AND PROLONGED DROUGHT IDENTIFICATION IN BULGARIA FOR WATER FRAMEWORK DIRECTIVE
Abstract
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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References9
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