Abandonment and rapid infilling of a tide-dominated distributary channel at 0.7 ka in the Mekong River Delta

Abstract The Ba Lai distributary channel of the Mekong River Delta was abandoned and infilled with sediment during the Late Holocene, providing a unique opportunity to investigate the sediment fill, timing and mechanisms of channel abandonment in tide-dominated deltaic systems. Based on analysis and...

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Autores principales:	Marcello Gugliotta, Yoshiki Saito, Thi Kim Oanh Ta, Van Lap Nguyen, Toru Tamura, Zhanghua Wang, Andrew D. La Croix, Rei Nakashima
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/6e4e52e6945a46a4a131e516ed331e27
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spelling	oai:doaj.org-article:6e4e52e6945a46a4a131e516ed331e272021-12-02T15:49:39ZAbandonment and rapid infilling of a tide-dominated distributary channel at 0.7 ka in the Mekong River Delta10.1038/s41598-021-90268-62045-2322https://doaj.org/article/6e4e52e6945a46a4a131e516ed331e272021-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-90268-6https://doaj.org/toc/2045-2322Abstract The Ba Lai distributary channel of the Mekong River Delta was abandoned and infilled with sediment during the Late Holocene, providing a unique opportunity to investigate the sediment fill, timing and mechanisms of channel abandonment in tide-dominated deltaic systems. Based on analysis and age dating of four sediment cores, we show that the channel was active since 2.6 ka and was abandoned at 0.7 ka as marked by the abrupt disappearance of the sand fraction and increase in organic matter and sediment accumulation rate. We estimate that the channel might have been filled in a time range of 45–263 years after detachment from the deltaic network, with sediment accumulation rates of centimetres to decimetres per year, rapidly storing approximately 600 Mt of organic-rich mud. We suggest that the channel was abandoned due to a sediment buildup favoured by an increase in regional sediment supply to the delta. This study highlights that mechanisms for abandonment and infilling of tide-dominated deltaic channels do not entirely fit widely used models developed for fluvial-dominated environments. Their abandonment might be driven by autogenic factors related to the river-tidal and deltaic dynamics and favoured by allogenic factors (e.g., human impact and/or climate change).Marcello GugliottaYoshiki SaitoThi Kim Oanh TaVan Lap NguyenToru TamuraZhanghua WangAndrew D. La CroixRei NakashimaNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-11 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Marcello Gugliotta Yoshiki Saito Thi Kim Oanh Ta Van Lap Nguyen Toru Tamura Zhanghua Wang Andrew D. La Croix Rei Nakashima Abandonment and rapid infilling of a tide-dominated distributary channel at 0.7 ka in the Mekong River Delta
description	Abstract The Ba Lai distributary channel of the Mekong River Delta was abandoned and infilled with sediment during the Late Holocene, providing a unique opportunity to investigate the sediment fill, timing and mechanisms of channel abandonment in tide-dominated deltaic systems. Based on analysis and age dating of four sediment cores, we show that the channel was active since 2.6 ka and was abandoned at 0.7 ka as marked by the abrupt disappearance of the sand fraction and increase in organic matter and sediment accumulation rate. We estimate that the channel might have been filled in a time range of 45–263 years after detachment from the deltaic network, with sediment accumulation rates of centimetres to decimetres per year, rapidly storing approximately 600 Mt of organic-rich mud. We suggest that the channel was abandoned due to a sediment buildup favoured by an increase in regional sediment supply to the delta. This study highlights that mechanisms for abandonment and infilling of tide-dominated deltaic channels do not entirely fit widely used models developed for fluvial-dominated environments. Their abandonment might be driven by autogenic factors related to the river-tidal and deltaic dynamics and favoured by allogenic factors (e.g., human impact and/or climate change).
format	article
author	Marcello Gugliotta Yoshiki Saito Thi Kim Oanh Ta Van Lap Nguyen Toru Tamura Zhanghua Wang Andrew D. La Croix Rei Nakashima
author_facet	Marcello Gugliotta Yoshiki Saito Thi Kim Oanh Ta Van Lap Nguyen Toru Tamura Zhanghua Wang Andrew D. La Croix Rei Nakashima
author_sort	Marcello Gugliotta
title	Abandonment and rapid infilling of a tide-dominated distributary channel at 0.7 ka in the Mekong River Delta
title_short	Abandonment and rapid infilling of a tide-dominated distributary channel at 0.7 ka in the Mekong River Delta
title_full	Abandonment and rapid infilling of a tide-dominated distributary channel at 0.7 ka in the Mekong River Delta
title_fullStr	Abandonment and rapid infilling of a tide-dominated distributary channel at 0.7 ka in the Mekong River Delta
title_full_unstemmed	Abandonment and rapid infilling of a tide-dominated distributary channel at 0.7 ka in the Mekong River Delta
title_sort	abandonment and rapid infilling of a tide-dominated distributary channel at 0.7 ka in the mekong river delta
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/6e4e52e6945a46a4a131e516ed331e27
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_version_	1718385695567904768

Abandonment and rapid infilling of a tide-dominated distributary channel at 0.7 ka in the Mekong River Delta

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