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Peresyp
In Russian geomorphology, a peresyp (), also known as a bay-mouth bar is a narrow sandbar that rises above the water level (like a spit) and separates a liman or a lagoon from the sea. Unlike tombolo bars, a ''peresyp'' seldom forms a contiguous strip and usually has one or several channels (called ''girlo'' () in Russian) that connect the liman and the sea. Федченко Г.П, 'О самосадочной соли и соляных озерах Каспийского и Азовского бассейнов'' 1870p. 54/ref>ПЕРЕСЫПЬ '''' The noun пересыпь is der ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tylihul Estuary
__NOTOC__ The Tylihul Estuary also called Tylihulskyi lyman () or simply Tiligul is a Ramsar-listed government protected estuary or liman of the Tylihul River. Located in Odesa Oblast in the south of Ukraine, the estuary includes an ornithological game reserve and the Tylihulskyi Regional Landscape Park situated on the East coast. The name of the water body originates from the , meaning "mad, rabid lake". Geography Tylihul is one of the purest estuaries (brackish lagoons) on the northwest coast of the Black Sea, although there are some ecological concerns related to the existence of the bottom ammoniac tube and due to intensive fertilizing of the surrounding agricultural fields. The estuary has a length 80 km, width 0.2–3.5 km, and a depth up to 19 m. The isolation of the estuary from the Black Sea occurred in the 18th to 19th centuries. Now it is isolated from the sea by a 7-km long and 4-km wide '' peresyp'' shoal. The ''peresyp'' is covered by solonchaks a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sandbar
In oceanography, geomorphology, and geoscience, a shoal is a natural submerged ridge, bank, or bar that consists of, or is covered by, sand or other unconsolidated material, and rises from the bed of a body of water close to the surface or above it, which poses a danger to navigation. Shoals are also known as sandbanks, sandbars, or gravelbars. Two or more shoals that are either separated by shared troughs or interconnected by past or present sedimentary and hydrographic processes are referred to as a shoal complex.Neuendorf, K.K.E., J.P. Mehl Jr., and J.A. Jackson, eds. (2005) ''Glossary of Geology'' (5th ed.). Alexandria, Virginia, American Geological Institute. 779 pp. The term ''shoal'' is also used in a number of ways that can be either similar to, or quite different from, how it is used in geologic, geomorphic, and oceanographic literature. Sometimes, the term refers to either any relatively shallow place in a stream, lake, sea, or other body of water; a rocky area ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Liman (landform)
A liman is an enlarged estuary formed as a lagoon at the wide mouth of one or several rivers, where flow is nearly fully or partially constrained by a mouth bar of sediments ('' peresyp''), as in the Dniester Liman or the Razelm liman. A ''liman'' can be maritime (the bar being created by the current of a sea) or fluvial (the bar being created by the slowed or turned flow of a sediment-saturated river). The term describes many wet estuaries in the Black Sea and the Sea of Azov; a synonymous term guba (губа) is used in Russian sources for insignificantly blocked estuaries of the Russian shores in the north. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kuialnyk Estuary
The Kuialnyk Estuary (, ), formerly known as Andriivskyi Lyman, is an estuary of the Velykyi Kuialnyk on the northwest coast of the Black Sea, one of the group of Odesa estuaries, located north of Odesa. The name comes from Crimean Tatar ''kuyanlık'', meaning "thick". General characteristics The area, depending on the water level, ranges from 52–60 km². Its length is 28 km, and its width is more than 3 km. The average depth is about 1 m. The volume is about 52 million m³. It is separated from the sea by a sandy Kuyalnytskyi-Khadzhibey ''peresyp'' sandbar up to 3 km wide. The Velykyi Kuialnik River flows into the estuary. The lowest point of Ukraine is located near the Kuialnyk estuary: 5 meters below sea level. On the southeast coast of the estuary there is the Kuialnytskyi mud resort, on the banks of the estuary - beaches. The water temperature reaches 28-30 °C in summer. Once in the location of Kuialnyk estuary was located the mouth of the ri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Khadzhibey Estuary
The Khadzhibey Estuary, or Khadzhibeyskyi Liman (, ), is an estuary of the north-western part of the Black Sea, located on the north-west from the City of Odesa. It is named after the former Khadzhibey fortress. The estuary is separated from the sea by the Kuyalnytsky-Khadzhibey '' peresyp'' – sandbar, which is about 5 km in length. The length of the estuary is 31 km, width 0.5–2.5 km, square 70 km2, depth up to 2.5 m. The bottom of the estuary is covered by the flakes of black mud, which have healthy properties. The river flows to the estuary. The fauna of the estuary consists of crabs'' Rhithropanopeus harrisii'', shrimps '' Palaemon elegans'', round goby '' Neogobius melanostomus'' and monkey goby '' Neogobius fluviatilis'', etc. References * Starushenko L.I., Bushuyev S.G. (2001) Prichernomorskiye limany Odeschiny i ih rybohoziaystvennoye znacheniye. Astroprint, Odessa, 151 pp. (in Russian) * North-western Black Sea: biology and ecology, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Longshore Drift
Longshore drift from longshore current is a geological process that consists of the transportation of sediments (clay, silt, pebbles, sand, shingle, shells) along a coast parallel to the shoreline, which is dependent on the angle of incoming wave direction. Oblique incoming wind squeezes water along the coast, generating a water current that moves parallel to the coast. Longshore drift is simply the sediment moved by the longshore current. This current and sediment movement occurs within the surf zone. The process is also known as littoral drift. Beach sand is also moved on such oblique wind days, due to the swash and backwash of water on the beach. Breaking surf sends water up the coast (swash) at an oblique angle and gravity then drains the water straight downslope (backwash) perpendicular to the shoreline. Thus beach sand can move downbeach in a sawtooth fashion many tens of meters (yards) per day. This process is called "beach drift", but some workers regard it as sim ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crimea
Crimea ( ) is a peninsula in Eastern Europe, on the northern coast of the Black Sea, almost entirely surrounded by the Black Sea and the smaller Sea of Azov. The Isthmus of Perekop connects the peninsula to Kherson Oblast in mainland Ukraine. To the east, the Crimean Bridge, constructed in 2018, spans the Strait of Kerch, linking the peninsula with Krasnodar Krai in Russia. The Arabat Spit, located to the northeast, is a narrow strip of land that separates the Syvash lagoons from the Sea of Azov. Across the Black Sea to the west lies Romania and to the south is Turkey. The population is 2.4 million, and the largest city is Sevastopol. The region, internationally recognized as part of Ukraine, has been under Russian occupation of Crimea, Russian occupation since 2014. Called the Tauric Peninsula until the early modern period, Crimea has historically been at the boundary between the Classical antiquity, classical world and the Pontic–Caspian steppe, steppe. Greeks in pre-Rom ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coastal Geography
Coastal geography is the study of the constantly changing region between the ocean and the land, incorporating both the physical geography (i.e. coastal geomorphology, climatology and oceanography) and the human geography (sociology and history) of the coast. It includes understanding coastal weathering processes, particularly wave action, sediment movement and weather, and the ways in which humans interact with the coast. Wave action and longshore drift The waves of different strengths that constantly hit against the shoreline are the primary movers and shapers of the coastline. Despite the simplicity of this process, the differences between waves and the rocks they hit result in hugely varying shapes. The effect that waves have depends on their strength. Strong waves, also called destructive waves, occur on high-energy beaches and are typical of winter. They reduce the quantity of sediment present on the beach by carrying it out to bars under the sea. Constructive, weak wave ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geomorphology
Geomorphology () is the scientific study of the origin and evolution of topographic and bathymetric features generated by physical, chemical or biological processes operating at or near Earth's surface. Geomorphologists seek to understand why landscapes look the way they do, to understand landform and terrain history and dynamics and to predict changes through a combination of field observations, physical experiments and numerical modeling. Geomorphologists work within disciplines such as physical geography, geology, geodesy, engineering geology, archaeology, climatology, and geotechnical engineering. This broad base of interests contributes to many research styles and interests within the field. Overview Earth's surface is modified by a combination of surface processes that shape landscapes, and geologic processes that cause tectonic uplift and subsidence, and shape the coastal geography. Surface processes comprise the action of water, wind, ice, wildfire, and lif ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mouth Bar
A mouth bar is an element of a deltaic system, which refers to the typically mid-channel deposition of the sediment transported by the river channel at the river mouth. Formation mechanism River mouth bars form because the cross-sectional area of the expanding sediment-laden outflow increases, and consequently, the sediment transport rate down the jet centerline decreases basinward as flow progresses from confined to unconfined. More specifically, four stages of the river mouth bar formation are: (1) Turbulent jet, expanding into a shallow and sloping basin, first creates parallel subaqueous levees extending basinward and starting a river mouth bar basinward of the levee tips due to the decrease in jet momentum flux and resulting the high sedimentation rate in this region; (2) The subaqueous levees extend basinward and the river mouth bar aggrades and progrades since its presence causes flow acceleration on streamlines over the bar, and subsequently, this acceleration chang ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Braid Bar
Braid bars, or mid-channel bars, are river bars typically present in braided river channels. These formations have many names, including medial, longitudinal, crescentic, and transverse bars, as well as the more colloquial sandflat. Braid bars are distinguished from point bars due to their presence in the middle of a flow channel, rather than along a bank of the river channel. Formation Braid bars often originate from remnants of point bars or the growth of mid-channel unit bars in braided rivers. These features typically form in rivers with a high sediment load, within channels characterized by a large bed load and easily-eroded bank material. There are several mechanisms of formation. One explanation is that flow in the river may be redirected over a point bar, wherein the bar may be separated from the bank and thus become isolated within the channel. This forms a small ‘island’ of sediment, which can evolve into a braid bar. Alternatively, an obstacle such ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
