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ANALYSIS OF HIGH WAVE DURING HYDROLOGICAL EXTREME EVENT ON 10-15 DECEMBER 2021 WITH SIGNIFICANT RAINFALL IN SOUTHERN BULGARIA
Abstract
Manual measurement of flow velocity and streamflow discharge during high waters is often impossible because of different factors: night events, harsh meteorological conditions, very high dangerous river velocities and levels or infrastructure destruction. The purpose of this study is to determine maximums of river flow velocity and streamflow discharge with hydraulic engineering methods, as well to determine the modulus of runoff at some stations in the East Aegean River Basin in South Bulgaria for the period between 10 and 15 December 2021 characterized with heavy rain. At that time significant precipitations were observed in South Bulgaria as result of a large cyclone over the East Mediterranean area. As a result of these precipitations, the river water levels in the whole country have raise, but the most significant increases were observed in the rivers of the Rhodope Mountains: upper streams of Arda River, the rivers Varbitsa, Krumovitsa, Vacha, Shirokolashka, Chepelarska, etc. On Arda River a large pedestrian bridge altogether with the telemetric station for quantitative river flow monitoring were destroyed and engulfed by water. We determined analytically the maximum streamflow discharge and water levels of Arda River at the village of Kitnitsa and of Vacha River at the station of Zabral. Computed data shows statistic probabilities of maximum streamflow discharge of about 20 year return period (5%). Hydrographs from stations for water levels in the upper or downstream of the river flow are used for revision and verification. We also use information about the calculated surface velocity with the LSPIV method and we show results computed with the coupled SURFEX-RAPID hydrological model. A retrospective analysis is made using data on high waters that passed on 12th December 1991, during which similar water quantities were observed along Varbitsa River.
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