Large-Scale Channel Migration in the Sittang River Estuary

Abstract An estuary is a dynamic environment where marine and fluvial processes meet to form complex and transient morphology. The estuary morphology is largely determined by net sediment transport by two-way tidal flows, but the hydrodynamics also depends on the morphology of the tidal channels. Th...

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Autores principales:	T. Shimozono, Y. Tajima, S. Akamatsu, Y. Matsuba, A. Kawasaki
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2019
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/557b9828b9b749288326f5ed44518799
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spelling	oai:doaj.org-article:557b9828b9b749288326f5ed445187992021-12-02T15:09:22ZLarge-Scale Channel Migration in the Sittang River Estuary10.1038/s41598-019-46300-x2045-2322https://doaj.org/article/557b9828b9b749288326f5ed445187992019-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-019-46300-xhttps://doaj.org/toc/2045-2322Abstract An estuary is a dynamic environment where marine and fluvial processes meet to form complex and transient morphology. The estuary morphology is largely determined by net sediment transport by two-way tidal flows, but the hydrodynamics also depends on the morphology of the tidal channels. The estuary inherently accommodates cyclic processes that are internally generated through hydro-morphodynamic interactions. In addition, the estuary evolves in response to changes in external forces by natural and anthropogenic factors. Morphological changes under the different controls often hinder the comprehension of the evolutionary processes of estuaries. Here we explored morphological changes in the Sittang River estuary, Myanmar, which has great morphological dynamism from extreme tidal energy and large sediment inputs, through field surveys and satellite imagery analysis. We identify an autocyclic process in a sedimentary system driving large-scale channel migration in decadal to multidecadal cycles. We show that drastic changes of the estuary morphology occasionally occur with rapid bank erosion through modulation of the cyclic channel migration under conflicting tidal and fluvial forces. This extreme case with minimal human intervention highlights channel migration as a key process in morphological evolution of tide-dominated estuaries undergoing active infilling.T. ShimozonoY. TajimaS. AkamatsuY. MatsubaA. KawasakiNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 9, Iss 1, Pp 1-9 (2019)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q T. Shimozono Y. Tajima S. Akamatsu Y. Matsuba A. Kawasaki Large-Scale Channel Migration in the Sittang River Estuary
description	Abstract An estuary is a dynamic environment where marine and fluvial processes meet to form complex and transient morphology. The estuary morphology is largely determined by net sediment transport by two-way tidal flows, but the hydrodynamics also depends on the morphology of the tidal channels. The estuary inherently accommodates cyclic processes that are internally generated through hydro-morphodynamic interactions. In addition, the estuary evolves in response to changes in external forces by natural and anthropogenic factors. Morphological changes under the different controls often hinder the comprehension of the evolutionary processes of estuaries. Here we explored morphological changes in the Sittang River estuary, Myanmar, which has great morphological dynamism from extreme tidal energy and large sediment inputs, through field surveys and satellite imagery analysis. We identify an autocyclic process in a sedimentary system driving large-scale channel migration in decadal to multidecadal cycles. We show that drastic changes of the estuary morphology occasionally occur with rapid bank erosion through modulation of the cyclic channel migration under conflicting tidal and fluvial forces. This extreme case with minimal human intervention highlights channel migration as a key process in morphological evolution of tide-dominated estuaries undergoing active infilling.
format	article
author	T. Shimozono Y. Tajima S. Akamatsu Y. Matsuba A. Kawasaki
author_facet	T. Shimozono Y. Tajima S. Akamatsu Y. Matsuba A. Kawasaki
author_sort	T. Shimozono
title	Large-Scale Channel Migration in the Sittang River Estuary
title_short	Large-Scale Channel Migration in the Sittang River Estuary
title_full	Large-Scale Channel Migration in the Sittang River Estuary
title_fullStr	Large-Scale Channel Migration in the Sittang River Estuary
title_full_unstemmed	Large-Scale Channel Migration in the Sittang River Estuary
title_sort	large-scale channel migration in the sittang river estuary
publisher	Nature Portfolio
publishDate	2019
url	https://doaj.org/article/557b9828b9b749288326f5ed44518799
work_keys_str_mv	AT tshimozono largescalechannelmigrationinthesittangriverestuary AT ytajima largescalechannelmigrationinthesittangriverestuary AT sakamatsu largescalechannelmigrationinthesittangriverestuary AT ymatsuba largescalechannelmigrationinthesittangriverestuary AT akawasaki largescalechannelmigrationinthesittangriverestuary
_version_	1718387815182499840

Large-Scale Channel Migration in the Sittang River Estuary

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