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Approche géomorphologique de la vallée de Deli et étude géoarchéologique du site historique de Kota Cina (Sumatra Nord, Indonésie)

Abstract : Paleoenvironment reconstructions and geomorphological dynamics understanding are increasingly being considered with regards to archaeological research. However, in Indonesia, this approach remains unusual. The present study of Kota Cina site (North Sumatra, Indonesia) is a pioneering work that aims to understand environmental changes dynamics at the human/nature interface for the purpose of paleogeographic reconstruction. Kota Cina is an ancient trade harbour of the Strait of Malacca. It was active between the XIth and the XIVth centuries AD. Nowadays, the site is located at 7 km from the coast. In order to examine the implication of natural and anthropogenic factors in the landscape changes of the region, investigations were carried out at Kota Cina and the Deli Valley. Two approaches were developed: (1) a geomorphological approach to reconstitute the hydro-sedimentary dynamics of Kota Cina site and its valley; (2) a biogeographical approach to reconstruct the vegetation changes at Kota Cina from a phytolith analysis of the site deposits. This work highlights important paleoenvironment changes as response to unique forcings. The pre-Holocene volcanism of the region generated a major filling of the valley by its detritism. The Holocene hydro-sedimentary response has altered the geomorphology of the region through a strong incision and significant sediment transfer. Finally, during the historical period, new landscape changes took place with the environment anthropisation, especially from the XIXth century with the development of colonial plantations.
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Yohan Chabot. Approche géomorphologique de la vallée de Deli et étude géoarchéologique du site historique de Kota Cina (Sumatra Nord, Indonésie). Géographie. Université Panthéon-Sorbonne - Paris I, 2017. Français. ⟨NNT : 2017PA01H058⟩. ⟨tel-01768642⟩

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