Age and morphodynamics of a sandy beach fronted by a macrotidal mud flat along the west coast of Korea: a lateral headland bypass model for beach-dune formation

Chang, Tae Soo; Hong, Seok Hwi; Chun, Sejong; Choi, Jeong‐Heon

doi:10.1007/s00367-016-0486-y

Cited by 17 publications

(17 citation statements)

References 29 publications

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“…As the boundary between the upper beach face and the lower mudflat of SMT‐Beaches with sediment heterogeneity (Holland and Elmore ; Anthony et al ., ), the SMT migrates synchronously with the mudflat changes and then tends to form the observed interbedded mud and sand layers over various timescales (Figure a). This statement is supported by several previous studies showing clear seasonal and decadal changes in the lower mudflats of estuarine beaches (Anthony and Dolique, ; Anthony et al ., ; Tamura et al ., ; Chang et al ., ).…”

Section: Discussionmentioning

confidence: 97%

“…Davis and Hayes, ; Wright and Short, ; Short, ; Komar, ; Aagaard et al ., ; Aagaard and Hughes, ). This statement can be inferred from recent studies on several well‐developed SMT‐Beaches in macrotidal coasts (Chang et al ., , ; Morio et al ., ), indicating their morphological responses to changes in wave climate and sediment supply and transport (Anthony et al ., , , ; Anthony and Dolique, ; Tamura et al ., ). Consequently, the potential mechanisms that dominate the contrasting morphological and sedimentary features can be mainly attributed to (1) tidal conditions, (2) wave climate, and (3) sediment supply and transport.…”

Section: Discussionmentioning

confidence: 98%

“…This phenomenon could lead to the zigzag distribution of the SMT of these estuarine SMT‐Beaches (Figures b and a–b). This observation can be supported by the surface sediment depiction from the Tra Vinh coastal beaches in the Mekong Estuary (Tamura et al ., ) and Dasari Beach in the Geum Estuary, Korea (Chang et al ., , ). By contrast, the SMT of those bay SMT‐Beaches are characterized by sharp variations in sediment grain‐size over a narrow transitional zone (Figures c–e and c–d).…”

Section: Discussionmentioning

confidence: 99%

“…Thus, these interbedded mud and sand layers with a range of 10 –1 to 10 1 cm imply an SMT migration over timescales ranging from years to decades or even a hundred years (Figure a). This phenomenon can be analogous to the sediment structures of certain SMT‐Beaches on the macrotidal coast (Chang et al ., ) and sandy beaches under the influence of mud banks (Calliari et al ., , ). Simultaneously, a recent multi‐times investigation on SMT distributions of these SMT‐Beaches from April 2018 to August 2019 in the Min Estuary has demonstrated that the SMT can also migrate on an interannual scale (Zhao et al ., In review).…”

Section: Discussionmentioning

confidence: 99%

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Morphological and sedimentary features of sandy‐muddy transitional beaches in estuaries and bays along mesotidal to macrotidal coasts

Zhao

Cai

et al. 2020

Earth Surf Processes Landf

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Sandy‐muddy transitional beaches (SMT‐Beaches), representing the transition from sandy beaches to tidal mudflats, should theoretically develop very different morphological and sedimentological characteristics in river estuaries and in semi‐enclosed bays due to their contrasting dynamic sedimentary environments. Evidence, however, is rare in the scientific literature. To reveal these morphological and sedimentary differences, the sand–mud transition (SMT) boundary distribution, beach profiles, and surface and downcore sediment grain‐size compositions of 27 SMT‐Beaches located along mesotidal to macrotidal coasts of the western Taiwan Strait, southeastern China, were investigated. The results show that typical estuarine SMT‐Beaches are mainly characterized by an ambiguous SMT, a long distance between the SMT and the coastline (31–302 m), lower SMT and inflection point altitudes (average –0.76 m and –0.04 m), and lower upper beach gradients (~0.068) with fine sand. Estuarine SMT‐Beach sediments display clear interbedded mud and sand layers, implying potential SMT migrations over various timescales. By contrast, typical bay SMT‐Beaches are characterized by distinct SMT, a short distance between the SMT and the coastline (11–52 m), higher SMT and inflection point altitudes (~0.24 m and ~0.35 m), and narrower upper beaches with higher gradients (~0.095) and coarse sand. Bay SMT‐Beaches present relatively stable sedimentary sequences and a narrow gravel belt surrounding the inflection point and/or SMT. These morphological and sedimentary differences between the two SMT‐Beach types are initially constrained by sediment supply and transport and are further affected by tide conditions and wave climate. Sediment supply and transport predominately control the sediment structures, while the tidal range strongly influences spatial variations in SMT distances. Wave climate normally drives SMT altitude variations. This study highlights the morphological and sedimentary differences in SMT‐Beaches in estuaries and bays, providing important knowledge for further revealing their morphodynamic processes and potential future nourishment. © 2020 John Wiley & Sons, Ltd.

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Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 98%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Morphological and sedimentary features of sandy‐muddy transitional beaches in estuaries and bays along mesotidal to macrotidal coasts

Zhao

Cai

et al. 2020

Earth Surf Processes Landf

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“…As is well known, estuaries and coasts are the areas where human activities are the most frequent and the degree of development is the highest [1]. As the interaction zones of land and the ocean, these areas are not only affected by runoff, tidal currents, waves, wind, solar radiation, coastal currents, and other water and biological processes, but also frequently affected by human activities [2][3][4][5][6][7]. The morphological structure and evolution processes of topography and geomorphology are affected by geological structure, sea level rise and fall, marine hydrodynamics, hydrochemical composition, climate, biology and human activities [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Characteristics of Underwater Topography, Geomorphology and Sediment Source in Qinzhou Bay

Cao¹,

Cai²,

Qi³

et al. 2020

Preprint

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Human activities for exploitation and utilization of coastal zones have transformed coastline morphology and severely changed regional flow fields, underwater topography, and sediment distribution in the sea. In this study, single-beam bathymetry coupled with sediment sampling and analysis was carried out to ascertain submarine topography, geomorphology and sediment distribution patterns and explore sediment provenance in Qinzhou Bay, China. The results show the following. 1) The underwater topography in Qinzhou Bay is complex and variable, with water depths in the range of 0–20 m. It can be divided into four underwater topographic zones: the central (outer Qinzhou Bay), eastern (Sanniang Bay), western (east of Fangcheng Port), and southern (outside of the bay) parts. 2) Based on geomorphological features, the study area comprises four major submarine geomorphological units (i.e., tide-dominated delta, tidal sand ridge group, tidal scour troughs, and underwater slope) and two intertidal geomorphological units (i.e., tidal flat and abrasion platforms). 3) Sandy sediments are widely present in Qinzhou Bay, accounting for 70% of the total sediments. From the mouth of the Maowei Sea to the offshore, the sediments gradually become coarser, shifting from sandy mud to muddy sand, and then to fine sand and medium–coarse sand. The detrital minerals contained in the sediments mainly consist of quartz, feldspar, debris, ilmenite, leucosphenite, and tourmaline, whereas the clay minerals are dominated by kaolinite, followed by illite and smectite. The sediment provenance is mainly terrigenous input from near-source rivers. With sea reclamation and dam construction, outer Qinzhou Bay has experienced enormous morphological variation of its coastline. Together with the channel effect where the velocity of ebb tide is greater than that of flood tide, the underwater topography is characterized by increased scale and height difference of troughs and ridges as well as enhanced offshore deposition.

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Selected contributions from the 9th International Conference on Tidal Sedimentology, November 2015, Puerto Madryn, Patagonia, Argentina: an introduction

Scasso

Cuitiño

2017

Geo-Mar Lett

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Age and morphodynamics of a sandy beach fronted by a macrotidal mud flat along the west coast of Korea: a lateral headland bypass model for beach-dune formation

Cited by 17 publications

References 29 publications

Morphological and sedimentary features of sandy‐muddy transitional beaches in estuaries and bays along mesotidal to macrotidal coasts

Morphological and sedimentary features of sandy‐muddy transitional beaches in estuaries and bays along mesotidal to macrotidal coasts

Characteristics of Underwater Topography, Geomorphology and Sediment Source in Qinzhou Bay

Selected contributions from the 9th International Conference on Tidal Sedimentology, November 2015, Puerto Madryn, Patagonia, Argentina: an introduction

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