DJEBEL ABIODH & KSAR BENI BARKA PHOTOGRAPHIÉS PAR LEO WEHRLI

LEO WEHRLI (1870–1954)
Djebel Abiodh & Ksar Beni Barka (300m env.)
Tunisie

 In Ksar Beni Barka von Norden, autochrome 1923, Tunisia

 

Le photographe
Leo Wehrli était un géologue, professeur et explorateur suisse. Après des études de musique, de botanique, de chimie, de minéralogie, de pétrographie et de géologie à Berlin et à Zurich. Immédiatement après avoir terminé sa thèse, il part pour l'Argentine avec le célèbre Carl Emanuel Burckhardt en 1896. Accrédité par le Musée de La Plata et le gouvernement argentin, il explore les Andes qu'il traverse au moins cinq fois au cours d'un séjour de deux ans. Ses travaux furent plus particulièrement orientés sur la délimitation de la frontière entre l'Argentine et le Chili après l'accord signé entre ces deux pays en 1881 et sur la détermination de la propriété des sommets des montagnes, des lignes de crêtes et des versants des bassins.
Après son retour en Suisse, il travaille entre 1900 et 1935 comme professeur puis chargé de cours au Geol. Centralblatt à Berlin ; entre 1901 et 1912, il écrit près de 500 articles. Il effectue d'autres voyages à travers l'Europe et l'Afrique du Nord (Egypte, Tunisie, Lybie) avant de retourner de nouveau en Argentine en 1938. Il a résumé les résultats de ses recherches dans de nombreux articles, notamment dans le Lexique géographique de la Suisse. Il participa à la fondation du Centre de formation des adultes de Zurich et y donna des conférences de 1921 à 1953. De 1931 à 1951, il fut membre de la commission du Club alpin suisse (CAS) pour la Bibliothèque centrale et en fut président pendant 14 ans.
Wehrli a laissé une collection de 15 000 plaques photographiques et photos, dont certaines ont été coloriées à la main par son épouse, née Anna Frey. Une grande partie des œuvres est mise en ligne par les archives photographiques de l'ETH-Bibliothek de Zurich.

La colline
Ksar Beni Barka (300 m) ou Ksar Béni Barka est un ksar de Tunisie,  situé dans le gouvernorat de Tataouine, sur une colline isolée du djebel Abiodh, dominant la vallée de l'oued Zonndag.
Il est considèré comme « l'un des plus anciens et des plus grands » ksour du pays, abandonné au début du protectorat français. Un ksar ou ighrem, est un village fortifié d'architecture berbère que l'on trouve en Afrique du Nord. Il s'agit d'une forteresse, toujours située dans un emplacement spectaculaire, soit perchée sur un promontoire escarpé accroché à une paroi rocheuse soit dressée au-dessus d'une oasis. Le 10 janvier 2020, le gouvernement tunisien propose le site pour un futur classement sur la liste du patrimoine mondial de l'Unesco. Le 21 janvier 2021, un arrêté en fait un monument classé
Le ksar, de forme ovale, compte de nombreuses habitations troglodytes dont le nombre est  incertain variant de 400 à 750 selon les sources. Elles s'élevaient sur trois à quatre étages. Huit anciennes huileries, une mosquée, le marabout Moula Edda et le mausolée de Bou Hjar s'y trouvent.
De nos jours, le complexe est complètement en ruines et ne subsiste que le relief de la colline

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2023 - Gravir les montagnes en peinture
Un blog de Francis Rousseau

EL VULCAN PLANCHÒN-PETEROA PHOTOGRAPHED BY LEO WEHRLI

LEO WEHRLI (1870–1954)
El Planchón-Peteroa (4,107 m - 13,474 ft)
Argentina- Chile border

In Planchon Vulcan, photo,1897, hand colorized by Anna Wehrli-Frey 1918,
ETH Library, Zurich

The volcano
EL Planchón-Peteroa (4,107m - 13,474 ft) also known as Azufre-Planchón-Peteroa or Nevado de los Banos is a complex of active volcanoes extending in a north–south direction along the border between Argentina and Chile. It consists of volcanoes of various ages with several overlapping calderas. Those include Volcán Planchón, Volcán Peteroa and Volcán Azufre. A partial collapse of the complex about 11,500 years ago produced a major debris avalanche, which followed the course of the Teno River until reaching the Chile Central Valley. Peteroa has a crater lake. Lagunas de Teno lies at the foot of Planchón volcano. In this area also is the Vergara International Pass.
Planchón-Peteroa Volcano erupted on September 6, followed by a stronger eruption on September 18. On September 6, 2010, , the volcano erupted once again, emitting a dark gray plume of volcanic ash. As winds blew the ash southeast into Argentina, residents there were warned by authorities to evacuate the nearby areas before Planchón-Peteroa would erupt again.

The photographer
Leo Wehrli was a Swiss geologist, professor and explorer. After studying music, botany, chemistry, mineralogy, petrography and geology in Berlin and Zurich, Wehrli became assistant to Albert Heim. Immediately after completing his thesis, he left for Argentina with the famous Carl Emanuel Burckhardt in 1896. Accredited by the La Plata Museum and the government of Argentina, he explored the Andes he crossed at least five times during a stay of two years. His work was more particularly oriented on the delimitation of the border between Argentina and Chile after the agreement signedbetween these two countries in 1881 and on the determination of the property of mountain peaks, ridge lines and basins slopes.
After his return to Switzerland, he worked between 1900 and 1935 as a teacher and then lecturer for the Geol. Centralblatt in Berlin ; between 1901 and 1912, he wrote nearly 500 articles. He made other trips through Europe and North Africa (Egypt) before going back to Argentina again in 1938. He has summarized his research results in numerous articles, notably in the Geographic Lexicon of Switzerland. He participated in the founding of the Zurich Adult Education Center and gave lectures there from 1921 to 1953. From 1931 to 1951 he was a member of the Swiss Alpine Club SAC commission for the Central Library and has was president for 14 years.
Wehrli left a collection of 15,000 slides, some of which were hand-colored by his wife, born Anna Frey. A large part of the works is made available online by the photographic archives of the ETH-Bibliothek in Zurich.

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2022 - Wandering Vertexes...
by Francis Rousseau

CERRO ACONCAGUA BY LEO WEHRLI

 

LEO WEHRLI (1870–1854)

Cerro Aconcagua (6, 961m - 22,838ft) 

Argentina

In Aconcagua, von der Cumbre de Uspallata, photo1897, hand colorized by Anna Wehrli-Frey 1918,

ETH Library, Zurich 

The mountain
Cerro Aconcagua (6,961 meters -22,838 ft) is the highest mountain outside of Asia and by extension the highest point in both the Western Hemisphere and the Southern Hemisphere.
Aconcagua is not a volcano.
The origin of the name is contested; it is either from the Mapuche "Aconca-Hue", which refers to the Aconcagua River, the Quechua "Ackon Cahuak", meaning "Sentinel of Stone", or Quechua "Anco Cahuac", meaning "White Sentinel" or the Aymara "Janq'u Q'awa" meaning "White Ravine", "White Brook".
Aconcagua is located in the Andes mountain range, in the Mendoza Province, Argentina, and lies 112 kilometers (70 mi) northwest of its capital, the city of Mendoza and 108 km (67 mi) from Santiago de Chile (the capital of Chile). The summit is in fact located about 5 kilometers from San Juan Province and 15 kilometers from the international border with Chile; its nearest higher neighbor is Tirich Mir in the Hindu Kush, 16,520 kilometers (10,270 mi) away.
Aconcagua is one of the Seven Summit, which includes the highest mountains of each of the seven continents. The 7 summits (which are obviously 8 !)... are :  Mt Everest (8,848m),  Mt Denali or Mc Kinley (6,194m), Kilimandjaro (5,895m), Mt Elbrus (5,642m), Vinson Massif (4,892m), Mt Blanc (4,807m) and Mount Kosciuszko (2,228m). Summiting all of them is regarded as a mountaineering challenge, first achieved on April 30, 1985 by Richard Bass.
The mountain and its surroundings are part of the Aconcagua Provincial Park. The mountain has a number of glaciers. The largest glacier is the Ventisquero Horcones Inferior at about 10 km long, which descends from the south face to about 3600 m altitude near the Confluencia camp. Two other large glacier systems are the Ventisquero de las Vacas Sur and Glaciar Este/Ventisquero Relinchos system at about 5 km.

The photographer
Leo Wehrli was a Swiss geologist, professor and explorer. After studying music, botany, chemistry, mineralogy, petrography and geology in Berlin and Zurich, Wehrli became assistant to Albert Heim. Immediately after completing his thesis, he left for Argentina with the famous Carl Emanuel Burckhardt in 1896. Accredited by the La Plata Museum and the government of Argentina, he explored the Andes he crossed at least five times during a stay of two years. His work was more particularly oriented on the delimitation of the border between Argentina and Chile after the agreement signedbetween these two countries in 1881 and on the determination of the property of mountain peaks, ridge lines and basins slopes.
After his return to Switzerland, he worked between 1900 and 1935 as a teacher and then lecturer for the Geol. Centralblatt in Berlin ; between 1901 and 1912, he wrote nearly 500 articles. He made other trips through Europe and North Africa (Egypt) before going back to Argentina again in 1938. He has summarized his research results in numerous articles, notably in the Geographic Lexicon of Switzerland. He participated in the founding of the Zurich Adult Education Center and gave lectures there from 1921 to 1953. From 1931 to 1951 he was a member of the Swiss Alpine Club SAC commission for the Central Library and has was president for 14 years.
Wehrli left a collection of 15,000 slides, some of which were hand-colored by his wife, born Anna Frey. A large part of the works is made available online by the photographic archives of the ETH-Bibliothek in Zurich.

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2020 - Wandering Vertexes...
by Francis Rousseau