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Terrasses alluviales et terrasses agricoles. Première approche des comblements sédimentaires et de leurs aménagements agricoles depuis 5000 av. n. è. à Wakarida (Éthiopie)

Abstract : In Northern Tigray (Ethiopia), contemporaneous agriculture is based on soils stored and developed on terraces, upstream of dry-stone walls crossing the thalwegs of this mountainous area. The discovery, during archaeological surveys, of aksumite and pre-aksumite settlements on the site of Wakarida and its surroundings, questions the age of such terraces landscapes. Comparing with ancient terraces from all over the world, dating from the 3rd millennium BCE, as well as with the functioning of contemporaneous structures maintaining soils and forming thick accumulations, raises the question of the age of those constructions and of their role in the sedimentary filling of the valleys. Sedimentological study and dating of deposits, consultation of iconographic and textual archives, of ancient aerial photographs and conducting of ethnogeomorphological interviews with farmers have formed the basis for first hypotheses regarding the evolutions of the landscape and the environment since the Mid-Holocene. Results tend to show that terraces are recent and develop on inherited sedimentary fillings. These ones testify from changes in the human occupation in the area, from a light footprint to a strong demographic pressure during Aksumite times, followed by an abandonment phase and very recent reoccupation.
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https://halshs.archives-ouvertes.fr/halshs-02446277
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Submitted on : Monday, January 20, 2020 - 5:16:35 PM
Last modification on : Friday, March 19, 2021 - 2:44:03 PM

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Ninon Blond, Nicolas Jacob-Rousseau, Yann Callot. Terrasses alluviales et terrasses agricoles. Première approche des comblements sédimentaires et de leurs aménagements agricoles depuis 5000 av. n. è. à Wakarida (Éthiopie). Géomorphologie : relief, processus, environnement, Groupe français de géomorphologie (GFG), 2018, Géomorphologie, paléoenvironnements et géoarchéologie des mondes tropicaux, 24 (3), pp.277-300. ⟨10.4000/geomorphologie.12258⟩. ⟨halshs-02446277⟩

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