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Fall Wind
A fall wind is a type of downslope wind. Like katabatic winds, it is driven by the flow of an elevated, high-density (usually cold) air mass into a lower-density (warmer) air mass, but the term fall wind is restricted to the cases where the cold air mass is not due to radiative cooling of a slope, but to the presence of a dense air mass at the top of a slope. A well-known example of a fall wind is the Bora in the Adriatic sea region, to the extent that the term ‘bora wind’ is sometimes used to designate a fall wind. The presence of the dense (cold) air mass at the top can be caused by various meteorological phenomena, such as the arrival of a cold front, or from the advection of cool marine air by a sea breeze. The flow of the dense air mass during fall winds events is similar to the flow of water over a dam, with a hydraulic jump found downstream. Examples of fall winds are the Bora in the Adriatic, the Athos fall wind in Greece, or the Marinada in Catalonia Catalon ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Katabatic Wind
A katabatic wind (named ) is a downslope wind caused by the flow of an elevated, high-density air mass into a lower-density air mass below under the force of gravity. The spelling catabatic is also used. Since air density is strongly dependent on temperature, the high-density air mass is usually cooler, and the katabatic winds are relatively cool or cold. Examples of katabatic winds include the downslope valley and mountain breezes, the piteraq winds of Greenland, the Bora in the Adriatic, the Bohemian Wind or ''Böhmwind'' in the Ore Mountains, the Santa Ana winds in southern California, the oroshi in Japan, or "the Barber" in New Zealand. Not all downslope winds are katabatic. For instance, winds such as the föhn and chinook are rain shadow winds where air driven upslope on the windward side of a mountain range drops its moisture and descends leeward drier and warmer. Mechanism A katabatic wind originates from the difference of density of two air masses located ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bora (wind)
The bora is a northerly to north-easterly katabatic wind in areas near the Adriatic Sea. Similar nomenclature is used for north-eastern winds in other littoral areas of eastern Mediterranean and Black Sea basins. Name It is known in Greek as (''mpóra'', pronounced ''bora'') and Italian as . In English, the name ''bora'' is used. The Serbo-Croatian name and Slovene are not etymologically related to ''bora''; they derive from Common Slavic ''burja'' 'storm' (from the verb ''*burĭti''), and the meaning 'bora' developed later. The same root as ''bora'' is found in the name of the Greek mythological figure of Boreas (Βορέας), and the Modern Greek word for the north wind . Historical linguists speculate that the name may derive from a Proto-Indo-European root *''gworhx-'' 'mountain', which gave rise to Slavic ''gora'' and Sanskrit ''giri-'', both 'mountain'. Features The changeable bora can often be felt all over Adriatic Croatia, the Montenegrin Littoral, the Sloven ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Adriatic Sea
The Adriatic Sea () is a body of water separating the Italian Peninsula from the Balkans, Balkan Peninsula. The Adriatic is the northernmost arm of the Mediterranean Sea, extending from the Strait of Otranto (where it connects to the Ionian Sea) to the northwest and the Po Valley. The countries with coasts on the Adriatic are Albania, Bosnia and Herzegovina, Croatia, Italy, Montenegro, and Slovenia. The Adriatic contains more than 1,300 islands, mostly located along its eastern coast. It is divided into three basins, the northern being the shallowest and the southern being the deepest, with a maximum depth of . The prevailing currents flow counterclockwise from the Strait of Otranto. Tidal movements in the Adriatic are slight, although acqua alta, larger amplitudes occur occasionally. The Adriatic's salinity is lower than the Mediterranean's because it collects a third of the fresh water flowing into the Mediterranean, acting as a dilution basin. The surface water temperatures ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sea Breeze
A sea breeze or onshore breeze is a wind that blows in the afternoon from a large body of water toward or onto a landmass. By contrast, a land breeze or offshore breeze is a wind that blows in the night from a landmass toward or onto a large body of water. Sea breezes and land breezes are both important factors in coastal regions' prevailing winds. Sea breeze and land breeze develop due to differences in air pressure created by the differing heat capacity, heat capacities of water and dry land. As such, sea breezes and land breezes are more localised than prevailing winds. Since land heats up much faster than water under solar radiation, a sea breeze is a common occurrence along coasts after sunrise. On the other hand, dry land also cools faster than water without solar radiation, so the wind instead flows from the land towards the sea when the sea breeze dissipates after sunset. The land breeze at nighttime is usually shallower than the sea breeze in daytime. Unlike the day ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hydraulic Jump
A hydraulic jump is a phenomenon in the science of hydraulics which is frequently observed in open channel flow such as rivers and spillways. When liquid at high velocity discharges into a zone of lower velocity, a rather abrupt rise occurs in the liquid surface. The rapidly flowing liquid is abruptly slowed and increases in height, converting some of the flow's initial kinetic energy into an increase in potential energy, with some energy irreversibly lost through turbulence to heat. In an open channel flow, this manifests as the fast flow rapidly slowing and piling up on top of itself similar to how a shockwave forms. It was first observed and documented by Leonardo da Vinci in the 1500s. The mathematics were first described by Giorgio Bidone of Turin University when he published a paper in 1820 called ''Experiences sur le remou et sur la propagation des ondes''. The phenomenon is dependent upon the initial fluid speed. If the initial speed of the fluid is below the critical ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Marinada (wind)
The Marinada is a fall wind occurring mostly during summer in the Urgell region of Catalonia. It blows from the south-east and usually arrives in the late afternoon. It is known by local people as a relief from the summer heat. Usage The term Marinada may sometimes be used in Catalan to refer to a sea breeze in the general sense. However, it is in the inland comarcas of Catalonia that the term is most commonly used, and refers to this specific fall wind (which originates from a sea breeze). Mechanisms The Marinada originates from the flow of a cool marine air mass in the eastern Ebro basin (as indicated by its name). This marine air mass is first driven inland by the sea breeze during the morning and early afternoon. If there is no strong background wind, it reaches the top of the Catalan Pre-Coastal Range The Catalan Pre-Coastal Range () is a system of mountain ranges running parallel to the Mediterranean Sea coast in Catalonia. It is part of the Catalan Mediterranean S ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Catalonia
Catalonia is an autonomous community of Spain, designated as a ''nationalities and regions of Spain, nationality'' by its Statute of Autonomy of Catalonia of 2006, Statute of Autonomy. Most of its territory (except the Val d'Aran) is situated on the northeast of the Iberian Peninsula, to the south of the Pyrenees mountain range. Catalonia is administratively divided into four Provinces of Spain, provinces or eight Vegueries of Catalonia, ''vegueries'' (regions), which are in turn divided into 43 Comarques of Catalonia, ''comarques''. The capital and largest city, Barcelona, is the second-most populous Municipalities in Spain, municipality in Spain and the fifth-most populous List of metropolitan areas in Europe, urban area in the European Union. > > > ''Catalonia'' theoretically derived. During the Middle Ages, Byzantine Empire, Byzantine chroniclers claimed that ''Catalania'' derives from the local medley of Goths with Alans, initially constituting a ''Goth-Alania''. Othe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
