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Sastrugi
Sastrugi, or zastrugi, are features formed by erosion of snow by wind. They are found in polar regions, and in snowy, wind-swept areas of temperate regions, such as frozen lakes or mountain ridges. Sastrugi are distinguished by upwind-facing points, resembling anvils, which move downwind as the surface erodes. These points usually lie along ridges parallel to the prevailing wind; they are steep on the windward side and sloping to the leeward side. Smaller irregularities of this type are known as ripples (small, ~10 mm high) or wind ridges.
Large sastrugi are troublesome to skiers and snowboarders. Traveling on the irregular surface of sastrugi can be very tiring, and can risk breaking equipment—ripples and waves are often undercut and the surface is hard and unforgiving, with constant minor topographic changes between ridge and trough.
Etymology
The words sastrugi and zastrugi are Russian-language plurals; the singular is zastruga. The form sastruga started as the German-language transliteration of the Russian word заструга (plural: заструги).
A Latin-type analogical singular sastrugus is used in various writings on exploration of the South Pole, including Robert Falcon Scott's expedition's diaries and Ernest Shackleton's The Heart of the Antarctic.
Formation mechanism
White and black colors on sastrugi are not lights and shadows, they demonstrate difference in radioreflectivity of snow deposits on the windward and leeward sides of a sastruga.
Under the action of steady wind, free snow particles accumulate and drift like the sand grains in barchan dunes, and the resulting drifting snow shapes are also popularly referred to as barchans. Inuit of Canada call them kalutoqaniq. When winds slacken, the drifted formations consolidate via sublimation and recrystallization. Subsequent winds erode kalutoqaniq into the sculptured forms of sastrugi. Inuit call large sculpturings kaioqlaq and small ripples tumarinyiq. Further erosion may turn kaioqlaq back into drifting kalutoqaniq. An intermediate stage of erosion is mapsuk, an overhanging shape. On the windward side of a ridge, the base erodes faster than the top, producing a shape like an anvil tip pointing upwind.
On sea ice
Sastrugi are more likely to form on first-year sea ice than on multiyear ice. First-year ice is smoother than multiyear ice, which allows the wind to pass uniformly over the surface without topographic obstructions. Except during the melt season, snow is dry and light in climates cold enough for sea ice, allowing the snow to be easily blown and create sastrugi parallel to the wind direction. The locations of sastrugi are fixed by March in the northern hemisphere and may be linked to the formation of melt ponds. Melt ponds are more likely to form in the depressions between sastrugi on first-year ice.
Source: Wikipedia
If you are familiar with the flowering tree called a dogwood, you might be surprised to learn this fact. What you are looking at is the true flower on a dogwood tree. The white petals of the dogwood flower are actually leaf-like growths called bracts rather than true petals. The actual flowers are in the cluster at the center of the dogwood bloom.
A female stands in water grooming in the middle of a small flock. While the males get a lot more attention, I find the females have a lovely subtle plumage, and the fall reflections on the water framed the scene well.
A larger group spent several weeks on the Lake in the fall, spooked and flushed periodically by Hawks and the occasional Bald Eagle. The species is a frequent fall visitor, and there are occasional northbound migrants in the spring.
A feature of the species that always seems striking to my eye is the short, beautifully coloured bill. It is often described as ‘goose-like’ and it helps them have greater pulling force on the underwater greens that form the core of their diet.
Cette place forme le cœur de la vieille ville de Francfort-sur-le-Main (Frankfurt am Main), Land de Hesse en Allemagne.
Le Römerberg (littéralement: le « mont des Romains ») occupe l'emplacement approximatif de la ville romaine, bâtie au cours du Ier siècle après Jésus-Christ. Ce qui explique son nom. Depuis le Moyen Âge, le Römerberg accueille de nombreuses foires, ainsi que le marché de Noël (Weihnachtsmarkt) durant les 4 semaines de l'Avent. Désormais, il est aussi un lieu de spectacles extérieurs.
On a ici une vue panoramique de l'ensemble de maisons à colombages appelé Ostzeile. Cet ensemble de maisons historiques ferme à l’est la place Römerberg. Sur la place, se dresse la Gerechtigkeitsbrunnen (fontaine de la Justice) datant de 1543 car elle est surmontée d'une statue de la Justice due à Philipp Uffenbach.
À l’est, en retrait, on distingue aussi la tour de la Kaiserdom St. Bartholomäus (en travaux) édifiée sur Domplatz entre le 13e et le 15e siècle sur l'emplacement d'une construction carolingienne. L'élection des empereurs (dès 1356), puis leur couronnement (à partir de 1562) eurent lieu dans cette église, ce qui lui valut l'appellation de cathédrale Saint-Barthélemy de Francfort.
À droite de la photo, on distingue par ailleurs la Nikolaikirche (13e siècle) qui limite au sud la place Römerberg.
Sur cette place, il y a aussi (pas visible sur cette photo) de nombreux immeubles des 14e au 18e siècle qui comprend à l'ouest, la maison Zum Römer, l'ancien hôtel de ville, dont la façade présente une horloge et est surmonté d’un clocheton, installé dans un bloc disparate de 3 maisons bourgeoises du Moyen Âge au pignon en escalier.
La présence de nombreux gratte-ciels a valu à Francfort-sur-le-Main le surnom de Mainhattan ou Chicago-sur-le-Main. Avec près d’un habitant sur trois n’ayant pas la nationalité allemande, Francfort est sans conteste la ville la plus internationale du pays. La ville de Goethe peut ainsi s’enorgueillir d’un brassage unique de cultures et de langues du monde. Capitale financière et commerciale de l’Allemagne, Francfort est aussi un important pôle scientifique et culturel, avec ses instituts de recherche, son université, son opéra, ses théâtres et un nombre sans cesse croissant de musées.
All photos copyright 2015-2025 by Gerd Michael Kozik No further use of my photos in any form such as websites, print, commercial or private use. Do not use my photos without my permission !
Maya Bay liegt auf der Insel Phi Phi Ley und ist weltberühmt für ihren halbkreisförmigen Strand, der von bis zu 100 Meter hohen Kalksteinfelsen umgeben ist. Der Ort wurde durch den Film The Beach mit Leonardo DiCaprio weltbekannt und zieht seither Besucher aus aller Welt an. Nach einer mehrjährigen Schließung zum Schutz der Natur ist der Zugang mittlerweile streng reguliert, um das empfindliche Ökosystem zu bewahren.
Maya Bay is located on the island of Phi Phi Ley and is world-famous for its crescent-shaped beach surrounded by towering limestone cliffs up to 100 meters high. The bay gained global recognition as the filming location of The Beach starring Leonardo DiCaprio. After being closed for several years to protect its fragile ecosystem, access is now strictly regulated to ensure sustainable tourism.
Thank you for your visit!
This was in a historical home in Lowell, MI. Several of the homes were open for visitors during the Fallasburg Village Celebration.
Für:“Crazy Tuesday“ am 13.05.2025.
Thema:“Round in a Square Format“…Rund in eckiger Form“
😄Thanks for views,faves and comments😄
Macropodus spechti Royal Blue -Royalblauer Makropode – eine Zuchtform vom Schwarzen Makropode aus Asien
Paar, oben Männchen
* Royal Blue Macropod – a cultivated form of Black Macropod from Asia
Pair, male above
Cómo se forman los azulejos
La edad geológica de Gran Canaria se estima en unos 14,6 millones de años mientras que los Azulejos de Veneguera tienen una edad aproximada de 13 millones de años. Los azulejos representan alteraciones hidrotermales que se producen cuando el agua subterránea procedente de la lluvia alcanza las raíces de un volcán activo.
Se trata de zonas que estuvieron próximas a fracturas o conductos por los que circulaban gases volcánicos y aguas termales en contacto con rocas calientes o intrusiones de magma. Estos contactos son los responsables de diversidad de minerales como son la allita, la clorita, la epidota y la caolinita que tiñen la montaña de colores azules, verdes y celestes.
Location: Moore
Loco: GBRf Shed 66749 (just about visible)
Train: 9.46am Clitheroe Castle Cement - Avonmouth loaded tanks (6V35)
Finish: So desaturated as to be almost monochrome
Best viewed enlarged.
12.55pm, 6th February 2019
A rainbow forms in showers of virga over the salt flats in Badwater Basin, Death Valley National Park, during our landscape and night photography workshop there a couple of weeks ago.
We woke before dawn to intermittent rains drops that morning, and we drove 40 miles toward the wall of black storm, counting on it to move or break up a bit. We stopped at a spot near, but not under it.
The entire view toward the rising sun was obscured with rain a short while earlier, then we had a small glowing window of sunrise light underneath, then we turned around to rainbows from the rising sun shooting over the clouds!
This image was taken just as the sun was reaching our position, you can see a trace of my shadow as the sun crested the clouds behind me.
Bologna
In vendita / for sale :
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"Amo la fotografia e, soprattutto, amo la fotografia di strada, per questo motivo fotografo spesso nei luoghi pubblici in cui appaiono le persone. Nella maggior parte dei casi non chiedo il permesso di fotografare perché probabilmente cambierei le immagini che cerco di ottenere. Queste foto obbediscono sempre ad un intento culturale, estetico, artistico e / o documentaristico e in nessun caso hanno lo scopo di mostrare a nessuno una situazione che potrebbe lederne l'immagine, minacciare la loro dignità o ottenere un beneficio economico. Tutto questo non significa affatto che non mi interessi delle persone che appaiono nelle mie immagini, quindi se ti riconosci in una delle mie fotografie e questo ti infastidisce, devi solo farmelo sapere e la ritirerò immediatamente . Allo stesso modo se vuoi una copia della tua immagine su carta o in un formato che ti permetta di stamparla tu stesso , ovviamente è tua. Grazie."
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♡ Pose Day of Rock
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Kaos Tatoo
♡ Kaos Walk Face Tatoo
♡Kaos walk tatoo
All photos copyright 2015-2024 by Yarin Asanth.
Please note the copyright. The photos are property of the photographer Gerd Michael Kozik! No further use of my photos in any form such as websites, print, commercial or private use. Do not use my photos without my express written permission !
Dear friends of photography, thank you very much for your visits, your faves, comments and group-awards!
Enjoy Drone photography with my DJI Mavic 3 Classic at Steckborn/ Switzerland at the Lake Constance
Clock, my picture. Taken in Sausalito, CA.
Effects done in DDG
Stars, from my private collection. Purchased.
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© All rights reserved. This image may not be copied, reproduced, distributed, republished, downloaded, displayed, posted or transmitted in any form or by any means, including electronic, mechanical, photocopying & recording without my written permission. Thanks.
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Autumn forms
Clockwise from top left
Roundspored Oysterling (Crepidotus cesatii) 11 November 2018
Trichia decipiens (a slime mould) 8 November 2018
Turkeytail (Trametes versicolor) 8 November 2018
Wrinkled Crust (Phlebia radiata) 16 November 2018
Cuttle Pool Nature Reserve, Warwickshire Wildlife Trust, Temple Balsall
Frost forms on objects that lose heat quickly, such as plants. If the temperature of the plant drops below zero, the water vapor that falls on those plants will transform into frost.
www.bnnvara.nl/vroegevogels/artikelen/rijp-een-wonderbaar...
Spindle tree, garden, Hengelo, The Netherlands
This Rock Pigeon rested for a few minutes on the railing along a walkway by the Norwalk River. I managed to get a couple of shots of the numbers and letters on the leg bands and with a bit of online research determined that this is a racing pigeon from a club in a nearby town. I sent them an email, but no response so far.
[PROMT]
Lake Bashkara was formed in the 1930s and 1940s due to the melting of the Bashkara glacier. In surveys of 1932-1933, the lake was not yet recorded, and in the late 1950s it already existed. The depth of the reservoir is 32 m. The height of Lake Bashkara above sea level is 2750 m.
Lake Bashkara is known for repeated cases of breakthrough. In 2017, heavy heavy rain triggered the overflow of Lake Bashkara. A block of ice broke off from a neighboring glacier and collapsed directly into the lake. About 1 million cubic meters of water escaped from the lake and, destroying everything in its path, swept along the bed of the Adylsu River. In the valley of the Adylsu River, 350-500 thousand cubic meters were involved in mudflows. m of solid material. 3 people died.
In the late 1980s. at the edge of the Bashkar glacier, a group of new breakthrough-hazardous lakes formed, which later merged into a single lake Lapa.
Озеро Башкара образовалось в 1930-1940-х годах вследствие таяния ледника Башкара. В исследованиях 1932-1933 г. озеро еще не зафиксировано, а в конце 1950-х оно уже существовало. Глубина водоёма — 32 м. Высота озера Башкара над уровнем моря составляет 2750 м.
Озеро Башкара известно неоднократными случаями прорыва. В 2017 году сильный проливной дождь спровоцировал переполнение озера Башкара. С соседнего ледника откололась глыба льда и рухнула прямо в озеро. Около 1 млн. кубометров воды вырвались из озера и, разрушая все на своем пути, пронеслись по руслу реки Адылсу. В долине реки Адылсу в селевой паводок было вовлечено 350–500 тыс. куб. м твердого материала. Погибли 3 человека.
В конце 1980-х гг. у края ледника Башкара образовалась группа новых прорывоопасных озёр, впоследствии соединившихся в единое озеро Лапа.