{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,25]],"date-time":"2026-06-25T20:00:22Z","timestamp":1782417622793,"version":"3.54.5"},"reference-count":14,"publisher":"STEF92 Technology","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2023,10,1]]},"abstract":"<jats:p>The study is focused on statistical analysis of river discharges. The registered river flow regime and hydrological characteristics of Yantra River are investigated. Yantra watershed is situated in North Bulgaria and belongs to Danube river basin Directorate. The current study is focused on the low flows. Thirteen hydrometrics stations located in the watershed are available for the investigation. Data used are from monitoring network of the National institute of meteorology and hydrology, Bulgaria. \nThe flow duration analysis was carried out for each gauged river within watershed. Flow duration analysis provides information on the percentage of time that flows are equalled or exceeded. Some baseflow indices were calculated in order to estimate the relative contribution of groundwater or baseflow. The obtained results clearly show a significant contribution of subsurface inflow to surface river runoff. The time of occurrence of minimum daily discharges (by month) were extracted from database and values were analysed. The minimum daily water discharge has the greatest frequency in the four summer months based on the performed analysis. In second place are the winter months when we work with three seasons each with four months duration. \nThe magnitude of the low flow event was studied using frequency analysis. The probability of occurrence of different flows was calculated. Regional regression analysis was applied. Regionalization scheme and regression curves are presented and discussed. The obtained results show that the most of the rivers from the watershed have a similar behaviour at low flow. \nThis study is focused on flow metrics that best describe the flow regime and the hydrological characteristics of Yantra river. Furthermore, hydrological studies are important for all types of environmental investigations \ufffd fish habitat, water intakes, stream productivity, etc. In the recent years we are dealing with co-called ecological flow. Particularly the low flow statistical analysis is crucial for determination of ecological flows in the sense of European water framework directive.<\/jats:p>","DOI":"10.5593\/sgem2023\/3.1\/s12.20","type":"proceedings-article","created":{"date-parts":[[2023,10,12]],"date-time":"2023-10-12T06:07:41Z","timestamp":1697090861000},"page":"167-174","source":"Crossref","is-referenced-by-count":1,"title":["STATISTICAL ANALYSIS OF YANTRA RIVER FLOW"],"prefix":"10.5593","volume":"23","author":[{"given":"Elena","family":"Bojilova","sequence":"first","affiliation":[{"name":"National Institute of Meteorology and Hydrology, BAS","place":["Bulgaria"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"3602","reference":[{"key":"ref=1","unstructured":"[1] Artinyan E., Dimitrov D., Kroumova K., Rankova M., Annual water resources assessment using different observations and models. Conference of the Danubian, ISBN:978-954-90537-2-2, Bulgaria, pp 215-222, 2017."},{"key":"ref=2","unstructured":"[2] Bojilova E., Estimation of minimum average monthly river discharge - Yantra river, North Bulgaria, E-book with full paper from XXVIII Conference of The Danubian Countries, DOI: 10.13140\/RG.2.2.15272.80641, Kiev, Ukraine, pp 62-66, 2019."},{"key":"ref=3","unstructured":"[3] Caissie D., Robichaud S., Towards a Better Understanding of the Natural Flow Regimes and Streamflow Characteristics of Rivers of the Maritime Provinces. \ufffd Canadian Technical Report of Fisheries and Aquatic Sciences 2843, Canada, 53, 2009."},{"key":"ref=4","unstructured":"[4] 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, www.danubeconference2017.org, Bulgaria, pp 321-330, 2017."},{"key":"ref=5","unstructured":"[5] Drumeva-Antonova G., Ljubenova K., Ilcheva I., Yordanova A., Rainova V., 2022 - Characterization of the groundwater affects in the assessment of hydrological drought \ufffd Journal of Balkan Ecology, ISSN 1311-0527 (print), ISSN 2815-3758 (online), vol.25, \ufffd 3, Bulgaria, p. 317-326, 2022"},{"key":"ref=6","unstructured":"[6] Hristova N., Hydrology of Bulgaria, Tip Top Press, Bulgaria, 832, 2012."},{"key":"ref=7","unstructured":"[7] Nacheva, K., Changes in specific discharge in the watershed of Vit River \ufffd SocioBrains, ISSN: 2367-5721, issue 52\/ December 2018, Bulgaria, 74-81, 2018."},{"key":"ref=8","doi-asserted-by":"crossref","unstructured":"[8] Orehova T., Gerginov P., Analysis of water regime and balance of springs from the Lovech-Tarnovo basin, Bulgaria, SGEM doi.org\/10.5593\/sgem2021\/3.1\/s12.05: Bulgaria, pp 35-43, 2021.","DOI":"10.5593\/sgem2021\/3.1\/s12.04"},{"key":"ref=9","doi-asserted-by":"crossref","unstructured":"[9] Orehova T., Gerginov P., Possible impact of climate change on the discharge of two springs from Central North Bulgaria, SGEM doi.org\/10.5593\/sgem2021\/3.1\/s12.32: Bulgaria, pp 35-43, 2021.","DOI":"10.5593\/sgem2021\/3.1\/s12.32"},{"key":"ref=10","doi-asserted-by":"crossref","unstructured":"[10] Stoyanova S., Koshinchanov G., Sensitivity analyses of conceptual and semidistributed hydrological models applied over a pilot basin, SGEM, 2019(3.1), Bulgaria, pp 513-520, 2019.","DOI":"10.5593\/sgem2019\/3.1\/S12.066"},{"key":"ref=11","doi-asserted-by":"crossref","unstructured":"[11] Vasileva T., An assessment of potential groundwater recharge zones in Bulgaria, Geologica Balcanica, 48 (1), Sofia, Bulgaria, pp 43\ufffd61, 2019.","DOI":"10.52321\/GeolBalc.48.1.43"},{"key":"ref=12","unstructured":"[12] Vasileva T., Spatial distribution of the groundwater recharge index in Lefedzha river basin, Engineering geology and hydrogeology, 30, Bulgaria, pp 17-30, 2016."},{"key":"ref=13","doi-asserted-by":"crossref","unstructured":"[13] Yordanova A., IIlcheva I., Approach and indicator system for assessment the impacts of reservoirs and prolonged drought identification in Bulgaria for Water framework directive, SGEM, 10.5593\/sgem2022\/3.1\/s12.07, 2022 (3.1), Bulgaria, pp 57-64, 2022.","DOI":"10.5593\/sgem2022\/3.1\/s12.07"},{"key":"ref=14","doi-asserted-by":"crossref","unstructured":"[14] Yordanova A., IIlcheva I., Bocheva L., Malcheva K., Lubenova K., Analysis of hydrological drought indices and their relationship with meteorological factors and river basin specifics, SGEM, 10.5593\/sgem2022\/3.1\/s12.05, (3.1), Bulgaria, pp 57-64, 2022.","DOI":"10.5593\/sgem2022\/3.1\/s12.05"}],"event":{"name":"23rd SGEM International Multidisciplinary Scientific GeoConference 2023","theme":"Earth and Planetary Sciences","location":"Albena, Bulgaria","acronym":"SGEM2023","number":"23","sponsor":["SGEM WORLD SCIENCE (SWS) Scholarly Society, Austria"],"start":{"date-parts":[[2023,7,3]]},"end":{"date-parts":[[2023,7,9]]}},"container-title":["SGEM International Multidisciplinary Scientific GeoConference\ufffd EXPO Proceedings","23rd SGEM International Multidisciplinary Scientific GeoConference Proceedings 2023, Water Resources. Forest, Marine and Ocean Ecosystems, Vol 23, Issue 3.1"],"original-title":[],"deposited":{"date-parts":[[2026,6,25]],"date-time":"2026-06-25T19:27:11Z","timestamp":1782415631000},"score":1,"resource":{"primary":{"URL":"https:\/\/epslibrary.at\/items\/06acf9fb-931d-4806-a611-ec6eb8879459\/statistical-analysis-of-yantra-river-flow"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2023,10,1]]},"references-count":14,"URL":"https:\/\/doi.org\/10.5593\/sgem2023\/3.1\/s12.20","relation":{},"ISSN":["1314-2704"],"issn-type":[{"value":"1314-2704","type":"print"}],"subject":[],"published":{"date-parts":[[2023,10,1]]}}}