A Tale of Two Deltas: Dam-Induced Hydro-Morphological Evolution of the Volta River Delta (Ghana) and Yellow River Delta (China)

Previous studies mostly focus on an individual delta, or deltas at a global scale, to explore dam effects on deltaic hydrological alteration and morphological evolution, while comparative studies on selected similar deltas remain scarce. In this study, we compare the alteration of river discharge an...

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Autores principales:	Dongxue Li, Weilun Gao, Dongdong Shao, Mawusi Amenuvor, Yao Tong, Baoshan Cui
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	dam regulation hydrological alteration morphological evolution Volta River Delta Yellow River Delta Hydraulic engineering TC1-978 Water supply for domestic and industrial purposes TD201-500
Acceso en línea:	https://doaj.org/article/1cc8edb1afbc41ee9ced6c3f6ec78c64
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spelling	oai:doaj.org-article:1cc8edb1afbc41ee9ced6c3f6ec78c642021-11-25T19:15:23ZA Tale of Two Deltas: Dam-Induced Hydro-Morphological Evolution of the Volta River Delta (Ghana) and Yellow River Delta (China)10.3390/w132231982073-4441https://doaj.org/article/1cc8edb1afbc41ee9ced6c3f6ec78c642021-11-01T00:00:00Zhttps://www.mdpi.com/2073-4441/13/22/3198https://doaj.org/toc/2073-4441Previous studies mostly focus on an individual delta, or deltas at a global scale, to explore dam effects on deltaic hydrological alteration and morphological evolution, while comparative studies on selected similar deltas remain scarce. In this study, we compare the alteration of river discharge and sediment load, as well as the associated deltaic area and shoreline, of two deltas, namely, the Volta River Delta in Ghana and the Yellow River Delta in China, which are subject to similar forcings and mainstem dam influences. The results show that the sediment loads of the Volta River Delta and Yellow River Delta have decreased abruptly and gradually, respectively, to ~10% of the pre-dam level, presumably due to differences in reservoir capacity and upstream dam location. Sediment decline has led to a decrease of the fluvial dominance ratio, which has also been affected by the river mouth location and shoreline orientation. As a consequence, the area of the Volta River Delta has shifted to a new quasi-equilibrium, whereas the Yellow River Delta has kept prograding. This comparative study provides references for understanding the future evolution of similar deltas around the world.Dongxue LiWeilun GaoDongdong ShaoMawusi AmenuvorYao TongBaoshan CuiMDPI AGarticledam regulationhydrological alterationmorphological evolutionVolta River DeltaYellow River DeltaHydraulic engineeringTC1-978Water supply for domestic and industrial purposesTD201-500ENWater, Vol 13, Iss 3198, p 3198 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	dam regulation hydrological alteration morphological evolution Volta River Delta Yellow River Delta Hydraulic engineering TC1-978 Water supply for domestic and industrial purposes TD201-500
spellingShingle	dam regulation hydrological alteration morphological evolution Volta River Delta Yellow River Delta Hydraulic engineering TC1-978 Water supply for domestic and industrial purposes TD201-500 Dongxue Li Weilun Gao Dongdong Shao Mawusi Amenuvor Yao Tong Baoshan Cui A Tale of Two Deltas: Dam-Induced Hydro-Morphological Evolution of the Volta River Delta (Ghana) and Yellow River Delta (China)
description	Previous studies mostly focus on an individual delta, or deltas at a global scale, to explore dam effects on deltaic hydrological alteration and morphological evolution, while comparative studies on selected similar deltas remain scarce. In this study, we compare the alteration of river discharge and sediment load, as well as the associated deltaic area and shoreline, of two deltas, namely, the Volta River Delta in Ghana and the Yellow River Delta in China, which are subject to similar forcings and mainstem dam influences. The results show that the sediment loads of the Volta River Delta and Yellow River Delta have decreased abruptly and gradually, respectively, to ~10% of the pre-dam level, presumably due to differences in reservoir capacity and upstream dam location. Sediment decline has led to a decrease of the fluvial dominance ratio, which has also been affected by the river mouth location and shoreline orientation. As a consequence, the area of the Volta River Delta has shifted to a new quasi-equilibrium, whereas the Yellow River Delta has kept prograding. This comparative study provides references for understanding the future evolution of similar deltas around the world.
format	article
author	Dongxue Li Weilun Gao Dongdong Shao Mawusi Amenuvor Yao Tong Baoshan Cui
author_facet	Dongxue Li Weilun Gao Dongdong Shao Mawusi Amenuvor Yao Tong Baoshan Cui
author_sort	Dongxue Li
title	A Tale of Two Deltas: Dam-Induced Hydro-Morphological Evolution of the Volta River Delta (Ghana) and Yellow River Delta (China)
title_short	A Tale of Two Deltas: Dam-Induced Hydro-Morphological Evolution of the Volta River Delta (Ghana) and Yellow River Delta (China)
title_full	A Tale of Two Deltas: Dam-Induced Hydro-Morphological Evolution of the Volta River Delta (Ghana) and Yellow River Delta (China)
title_fullStr	A Tale of Two Deltas: Dam-Induced Hydro-Morphological Evolution of the Volta River Delta (Ghana) and Yellow River Delta (China)
title_full_unstemmed	A Tale of Two Deltas: Dam-Induced Hydro-Morphological Evolution of the Volta River Delta (Ghana) and Yellow River Delta (China)
title_sort	tale of two deltas: dam-induced hydro-morphological evolution of the volta river delta (ghana) and yellow river delta (china)
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/1cc8edb1afbc41ee9ced6c3f6ec78c64
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A Tale of Two Deltas: Dam-Induced Hydro-Morphological Evolution of the Volta River Delta (Ghana) and Yellow River Delta (China)

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