Yoshiki Saito

Shimane University Japan, Estuary Research Center (EsReC), Faculty Member

National Institute of Advanced Industrial Science and Technology, Geological Survey of Japan, Faculty Member

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Address: Nishikawatsu-cho 1060, Matsue

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Kim M Cohen

Utrecht University

Horst R Marschall

Goethe-Universität Frankfurt am Main

Armando Marques-Guedes

UNL - New University of Lisbon

James Kirkland

Utah Geological Survey

Peter D Clift

University College London

Anil M Pophare

RTM Nagpur University

Eszter Banffy

Hungarian Academy of Sciences

sabina porfido

Consiglio Nazionale delle Ricerche (CNR)

Beata Gruszka

Adam Mickiewicz University in Poznań

Ferreol Salomon

Centre National de la Recherche Scientifique / French National Centre for Scientific Research

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Papers by Yoshiki Saito

Phase change in evolution of the modern Huanghe (Yellow River) Delta: Process, pattern, and mechanisms

Marine Geology, Jul 1, 2021

Abstract The modern Huanghe Delta used to be the most rapid land-building delta in the world. Its... more Abstract The modern Huanghe Delta used to be the most rapid land-building delta in the world. Its evolution has become a global concern because the sediment load of the Huanghe has decreased sharply in recent decades. However, few studies have revealed the full picture of Huanghe Delta evolution because of a lack of systematic bathymetric data off the delta. This study used 21 years of bathymetric data off the Huanghe Delta in combination with 34 scenes of Landsat imagery to study spatiotemporal evolution of the delta since 1976. Results indicate that the active lobe had an evolution distinct from the abandoned lobe. The temporal evolution of the active lobe had a four-phase pattern in both subaerial and subaqueous deltas, with different relationships with sediment load. In addition to sediment load, evolution of the active lobe was largely controlled by hydrodynamic-morphologic interactions and grain size of the Huanghe sediment. The abandoned lobe had a three-phase erosion since 1976 when the sediment supply from the river was cut off. A change in sediment dispersals might have dominated the evolution of the abandoned lobe. A newly assessed budget of the Huanghe sediment indicates that ~70% of the sediment load accumulated in the Huanghe Delta, which is much more than that estimated based on 210Pb-derived sedimentation rates or numerical studies. The present study comprehensively reveals the evolution of the modern Huanghe Delta and presents a typical example of the evolution of a large-river delta in response to global change.

Tide-Dominated Deltas

Springer eBooks, Sep 9, 2011

Among tidally infl uenced sedimentary environments, tide-dominated deltas are perhaps the most va... more Among tidally infl uenced sedimentary environments, tide-dominated deltas are perhaps the most variable and diffi cult to characterize. This variability is due in part to the major role that fl uvial systems play in defi ning their delta, with rivers differing widely in discharge, sediment load, seasonality, and grain size. Tidedominated deltas also tend to be large systems that can extend hundreds of kilometers across and along the continental margin. The associated sediment transport regimes are typically high energy, but they vary considerably at the scale of tidal cycles and seasonal river discharge. As a consequence of varying transport energy, the sedimentary successions formed in tide-dominated deltaic settings tend to be heterolithic, with interbedded sands, silts, and clays and both fi ning-and coarsening-upward facies associations. The deltaic nature of tide-dominated deltas that distinguishes them from other tidally infl uenced settings is defi ned by the cross-or along-shelf progradation of a clinoform, or 'S' shaped, sedimentary deposit. Under the infl uence of strong bed shear in tidally dominated margins, this prograding clinoform is often separated into two distinct units, one associated with the subaerial deltaplain and one with an offshore subaqueous delta. Onshore, the large, fertile deltaplains built by many modern tide-dominated deltas, especially in South and East Asia, are heavily populated and sustain large economies, making them global important settings. However, the reduction of fl uvial inputs by damming and water extraction, as well as intense agricultural, urban, and industrial land uses, threaten the stability and sustainability of these environments.

Yoshiki Saito

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