Факультет біології, географії та екології
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Item NEW HOLOCENE ICHTHYO-FOSSIL ASSEMBLAGE FROM EXTRUDED LAGOONAL OUTCROPS, CURONIAN SPIT, LITHUANIA(2023) Buynevich, I. V.; Pupienis, D.; Bitinas, A.; Davydov, O. V.; Damušytė, A.; Dambrauskienė, K.; Давидов, О. В.Fish remains (ichthyo-fossil assemblages) offer important information about past ecosystems and serve as taphonomic indicators of sedimentation and burial history. In recent years, several sets of fish remains have been collected from lagoonal mark outcrops exposed along the shores of the Curonian Lagoon, Lithuania. Unfortunately, due to ongoing erosion, most of the fossiliferous deposits have disappeared in recent years. Here we present new finds of three separate fish bone accumulations from a previously unsampled outcrop. Based on previous data, these (bream-like) fish are likely mid-Holocene in age and have been buried in a thanatocoenosis, as reflected by the grouping and delicate nature of the fossils, especially the scales.Item SPATIAL AND TEMPORAL VARIATIONS IN MAGNETIC SUSCEPTIBILITY OF COASTAL SANDS RESULTING FROM RECENT STORM ACTIVITY, SAAREMAA ISLAND, ESTONIA(2023) Buynevich, I. V.; Tõnisson, H.; Kont, A.; Palginõmm, V.; Suursaar, Ü.; Rosentau, A.; Hang, T.; Pupienis, D.; Davydov, O. V.; Давидов, О. В.Coastal strandplains on Saaremaa Island, Estonia, contain a rich archive of past events, which are recorded as geomorphic and lithological indicators of reworking (erosional) and depositional (accretionary) phases. This study presents a new dataset of low-field bulk magnetic susceptibility (MS) values from coastal sands as a rapid means of characterizing the ferrimagnetic and paramagnetic fraction in morphosedimentary units related to cyclone Gudrun (January 2005). Combining spatial and temporal patterns in MS (e.g., >600 SI for most peaks) with granulometric and geophysical databases provides the basis for applying similar integrated approach to reconstructing past extreme coastal events.Item LONGSHORE SUBSURFACE ANOMALIES CONSISTENT WITH MID-HOLOCENE CHANNELIZED STORM EROSION: TIHU STRANDPLAIN, HIIUMAA ISLAND, ESTONIA(2023) Buynevich, I. V.; Tõnisson, H.; Kont, A.; Suursaar, Ü.; Rosentau, A.; Hang, T.; Suuroja, S.; Davydov, O. V.; Давидов, О. В.Item CROSS-SECTIONAL MORPHOMETRY AND GEORADAR SIGNATURE OF SMALL NON-TIDAL INLET (PRORVA) CHANNELS, BLACK SEA, UKRAINE(2023) Buynevich, I. V.; Davydov, O. V.; Давидов, О. В.This study is the first comparison of a buried channel structure imaged with georadar and an active inlet (prorva) along the non-tidal Black Sea coast of Ukraine. A paleo-channel along the liman coast exhibits easterly dipping bounding surfaces (clinoforms) interpreted as a spit platform and culminates in a cut-and-fill structure (width ~5 m; depth ~1 m). An active channel with similar cross-sectional morphometry and dimensions is represented by Lazurnenska prorva along Kinburn peninsula. This comparative effort has implications to finding other buried channels along the barrier coasts and demonstrates the potential geological legacy of modern channels.Item GENETIC DIVERSITY OF INLET SYSTEMS ALONG NON-TIDAL COASTS: EXAMPLES FROM THE BLACK SEA AND SEA OF AZOV (UKRAINE)(2022) Davydov, O. V.; Karaliūnas, V.; Давидов, О. В.In the coastal zone of the oceans, coastal barriers are quite widespread. Within their limits, inlets periodically arise and exist for a certain time, which is of great geological, hydrological, ecological, and navigational significance. Along the coasts where tidal fluctuations predominate, tidal inlets stand out, which are quite well studied in terms of genesis, morpho-, hydro- and litho-dynamics. Inland, semi-isolated marine basins, where tidal fluctuations do not reach a significant amplitude, are called non-tidal seas. Within the coastal barriers of non-tidal seas, channels periodically arise and develop, which are called breaches or prorvas. Breaches are quite often mentioned in the specialized literature along the coasts of non-tidal seas, but they have not been purposefully studied. In this article, we tried to analyze the conditions for the formation of prorvas within non-tidal seas based on many years of research. We have identified four hydrodynamic situations in which breaches are formed. The presented variety of situations allows us to identify and describe four genetic types of prorvas: storm-generated, storm-surge-generated, wind-stress-generated, and river-stress (fluvially induced). The presented article is the first attempt to analyze the genetic characteristics of the breaches.Item ПРИРОДНІ УМОВИ ВИНИКНЕННЯ ШТОРМОВИХ НАГОНІВ У РАЙОНІ ГЕНІЧЕСЬКОЇ ДЕЛЬТИ(2019) Давидов, О. В.; Роскос, Н. О.; Роскос, О. М.; Давыдов, А. В.; Роскос, Н. А.; Роскос, А. Н.; Davydov, O. V.; Roskos, N. O.; Roskos, O. N.На сучасному етапі розвитку геосфери, в умовах глобальних кліматичних змін, суттєво збільшилась кількість небезпечних гідрологічних явищ, зокрема штормових нагонів. За останні десять років кількість відповідних явищ суттєво збільшилася в західні частині Азовського моря, у районі Генічеської дельти. Причини збільшення кількості катастрофічних коливань рівня моря, в даному регіоні, насамперед пов’язуються із змінами структури вітрового режиму. Під час власних досліджень, було з’ясовано, що на розвиток штормових нагонів в районі Генічеської дельти, також впливають геоморфологічні умови та антропогенна діяльність. На современном этапе развития геосферы в условиях глобальных климатических изменений значительно возросло число опасных гидрологических явлений и непосредственно штормовых нагонов. За последние десять лет количество соответствующих явлений существенно увеличилось в западной части Азовского моря, в районе Генической дельты. Причины увеличения количества катастрофических колебаний уровня моря, в данном регионе, непосредственно связываются с изменениями структуры ветрового режима. Во время собственных полевых исследований, было определено, что на развитие штормовых нагонов в районе Генической дельты, также влияют геоморфологические условия и антропогенная деятельность. Problem Statement and Purpose. The number of dangerous hydrological phenomena has significantly increased in the context of global climatic changes at present stage of the geosphere development. In the northwestern part of the Azov Sea the most dangerous natural processes are storm surges. Appropriate catastrophic synoptic phenomena occur with the simultaneous development of wind and anemobaric level fluctuations. These hazards very often lead to large economic losses and are often the cause of human casualties. To determine the reasons for the increasing number of storm surges in the investigated part of the Azov Sea we set the task to highlight the natural conditions for the occurrence of storm surges in the area of the Henichesk Delta. Henichesk Delta is located in the western part of the Azov Sea, near the junction of Arabatskaya Strilka and Henichesk ledge. This formation is a unique landform, the genesis of which is due to the interaction of various coastal currents and synoptic level fluctuations. Data & Methods. The actual information for writing the article was the materials of our own long-term field research, the materials of the Henichesk hydrometeorological station, as well as the data of various specialized Ukrainian electronic resources. In the process of preparing the article we used various methods of information processing, among which are: comparative-geographical, historical-geographical, cartographic and mathematical. Results. In the region of the delta, the amplitudes of wind and seiche oscillations reach the quite high levels and therefore are very important for the relief formation. Theoretical calculations indicate the likelihood of increase in the Henichesk area to the level of 260 cm and a fall to a height of 220 cm. However the long-term observations indicate the lower amplitudes as the maximum level was recorded in 1962 and reached 236 cm, and the minimum level - 187 cm was recorded in 1969. The oscillations development with extreme characteristics has certain temporal patterns. The number of hazardous events in the Henichesk Delta area has increased significantly over the past ten years. The formation of these fluctuations depends directly on the natural coastal zone geomorphological conditions and the underwater slope, as well as on certain types of anthropogenic activities. The study of these phenomena is very necessary to optimize the nature management in the Azov Sea.Item GENETIC FEATURES OF THE “WINGED FORELAND” COASTAL SYSTEM(2019) Davydov, O. V.; Давидов, О. В.Item ВИЗНАЧЕННЯ ПОНЯТТЯ «КРИЛАТИЙ МИС»: ІСТОРИЧНИЙ АНАЛІЗ ТА ЗАГАЛЬНА ХАРАКТЕРИСТИКА(2019) Давидов, О. В.; Davydov, O. V.Давидов, О. В. Визначення поняття «крилатий мис» : історичний аналіз та загальна характеристика / О. В. Давидов // Науковий вісник Херсонського держ. ун-ту. Сер. : Географічні науки. – Херсон, 2019. – Вип. № 10. – С. 119-129. - DOI 10.32999/ksu2413-7391/2019-10-17