Intra‐shoreface erosion in response to rapid sea‐level fall: depositional record of a tectonically uplifted strand plain, Pacific coast of Japan

Tamura, Takeshi; Nanayama, Futoshi; Saito, Yoshiki; Murakami, Fumitoshi; Nakashima, Rei; Watanabe, Kazuaki

doi:10.1111/j.1365-3091.2007.00876.x

Cited by 48 publications

(26 citation statements)

References 29 publications

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“…, 2004), the Nile Delta (Goodfriend & Stanley, 1999), the equatorial west coast of Africa (Anthony, 1995), the south‐east coasts of England (Long et al. , 2006) and Japan (Tamura et al. , 2007), and along nearly the entire Brazilian coast (see Dillenburg et al.…”

Section: Introductionmentioning

confidence: 99%

Evidence for a transgressive barrier within a regressive strandplain system: Implications for complex coastal response to environmental change

Hein¹,

FitzGerald²,

Cleary

et al. 2012

Sedimentology

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Clastic, depositional strandplain systems have the potential to record changes in the primary drivers of coastal evolution: climate, sea‐level, and the frequency of major meteorological and oceanographic events. This study seeks to use one such record from a southern Brazilian strandplain to highlight the potentially‐complex nature of coastal sedimentological response to small changes in these drivers. Following a 2 to 4 m highstand at ca 5·8 ka in southern Brazil, falling sea‐level reworked shelf sediment onshore, forcing coastal progradation, smoothing the irregular coastline and forming the 5 km wide Pinheira Strandplain, composed of ca 500 successive beach and dune ridges. Sediment cores, grab samples and >11 km of ground‐penetrating radar profiles reveal that the strandplain sequence is composed of well‐sorted, fine to very‐fine quartz sand. Since the mid‐Holocene highstand, the shoreline prograded at a rate of ca 1 to 2 m yr−1 through the deposition of a 4 to 6 m thick shoreface unit; a 1 to 3 m thick foreshore unit containing ubiquitous ridge and runnel facies; and an uppermost beach and foredune unit. However, the discovery of a linear, 100 m wide barrier ridge with associated washover units, a 3 to 4 m deep lagoon and 250 m wide tidal inlet within the strandplain sequence reveals a period of shoreline transgression at 3·3 to 2·8 ka during the otherwise regressive developmental history of the plain. The protected nature of Pinheira largely buffered it from changes in precipitation patterns, wave energy and fluvial sediment supply during the time of its formation. However, multiple lines of evidence indicate that a change in the rate of relative sea‐level fall, probably due to either steric or ice‐volume effects, may have affected this coastline. Thus, whereas these other potential drivers cannot be fully discounted, this study provides insights into the complexity of decadal‐scale to millennial‐scale coastal response to likely variability in sea‐level change rates.

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Section: Introductionmentioning

confidence: 99%

Evidence for a transgressive barrier within a regressive strandplain system: Implications for complex coastal response to environmental change

Hein¹,

FitzGerald²,

Cleary

et al. 2012

Sedimentology

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“…Stepped forced regression has been widely documented in the geological record in nearshore depositional environments (e.g., deltaic, shoreface) (Posamentier et al 1992;Hamberg and Nielsen 2000;Azeredo et al 2002;Tamura et al 2007) and particularly in some Cretaceous examples (Plint 1988;Pattison 1995;Fitzsimmons and Johnson 2000;Payenberg et al 2002;Payenberg et al 2003). However, it is poorly documented in fluvial deposits (but see Blum and Valastro 1994 andHamilton et al 2001), which may be due to low preservation potential and lack of recognition criteria.…”

Section: Criteria For Identifying Stepped Forced Regression In a Compmentioning

confidence: 95%

“…In addition, although there are many examples of stepped forced regressions associated with marine depositional systems (Plint 1988;Posamentier et al 1992;Hamberg and Nielsen 2000;Azeredo et al 2002;Tamura et al 2007), including the Ferron Notom Delta (Li and Bhattacharya 2011;Zhu et al 2012), there are far fewer examples that show how coeval valleys evolve during such stepped relative sea-level falls (Blum 1993;Zaitlin et al 1994;Hamilton et al 2001;Ardies et al 2002;Korus et al 2008). This study attempts to evaluate the possibility of the origin of the Ferron compound valley as a function of a high-frequency stepped forced regression and to propose models for identifying forced regressions by analysis of valley-fill deposits, as opposed to shoreline systems, which is more routinely attempted.…”

Section: Introductionmentioning

confidence: 97%

Facies-Architecture Study of A Stepped, Forced Regressvie Compound Incised Valley In the Ferron Notom Delta, Southern Central Utah, U.S.A

Bhattacharya

2013

Journal of Sedimentary Research

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Detailed facies-architecture study of a portion of a . 10-kilometer-wide compound incised valley in outcrops of the Turonian Ferron Notom Delta shows three simple incised valleys filled with different facies associations. The valley-fill deposits were mapped with 30 detailed measured sections, photomosaics, and bedding diagrams. The oldest, incised valley 3, forms a terrace deposit that erodes directly into hummocky-cross-bedded lower-shoreface deposits. It is filled with fine-to medium-grained tidally influenced deposits, characterized by abundant mud-draped cross beds, sparse burrowing, and a bimodal paleocurrent-direction pattern. The younger incised valley 2 locally cuts through the valley 3 terrace and also into the lower-shoreface deposits. The valley 2 fill comprises multi-story medium-grained fluvial deposits with minor finer-grained tidally influenced fluvial deposits in the upper 10%. The youngest, incised valley 1, also locally cuts into the lower-shoreface deposits, removing the terraces formed by valleys 2 and 3. Valley 1 is filled entirely with medium-grained fluvial deposits. The composite valley fill records generally increasing fluvial dominance and decreasing tidal influence during successive cut-and-fill episodes associated with each simple valley fill. It is hypothesized to correlate with a longer-term, stepped relative fall of sea level, punctuated by standstills, or minor rises of sea level.

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“…Bristow and Pucillo () characterised the subsurface structures and demonstrated the incremental building of the Guichen Bay ridge plain. Its application to coastal settings also holds great potential for reconstruction of palaeo sea level through the identification of wave‐built facies and their elevation (for example, Tamura et al, ). Radar reflectors appear to record bedding stratification, which can allow discrimination of aeolian‐deposited foredune sands from wave‐deposited beachface.…”

Section: The Need To Re‐examine the Processes Of Beach Ridge Morphodymentioning

confidence: 99%

Formation of beach‐ridge plains: an appreciation of the contribution by Jack L. Davies

Oliver

Thom

Woodroffe

2016

Geographical Research

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A robust debate among coastal geomorphologists as to the processes by which beach‐ridge plains around Australia have formed was initiated by a former President of the Institute of Australian Geographers. This review gives special consideration to the work of Jack L. Davies, whose academic contributions to coastal geomorphology in Australia have not always been appropriately acknowledged when explaining how similar plains have evolved elsewhere in the world. Davies recognised that relatively steep storm waves caused erosion (cut) on beaches, whereas less steep long‐period swell waves returned sand (fill). He considered the beach berm to be the nucleus on which a beach ridge formed, which could subsequently develop into a foredune, in contrast to cobble ridges that were deposited during storms. Offshore conditions regulate supply of sand to the shoreline, partly through effects on wave refraction, with higher rates of supply where the nearshore is shallow. It was apparent to Davies that the elevation of successive ridges might, but not necessarily, provide evidence of past changes of sea level, despite adornment by variable amounts of windblown dune sand. Morphodynamic understanding of long‐term coastal evolution, based on radiocarbon dating chronologies, has demonstrated that Australian coastal plains formed over the past ~6,000 years when sea level has been close to its present level, in contrast to several documented locations in the northern hemisphere where the sea has been rising for the past few millennia. Particularly insightful were observations by Davies that ridge formation could be influenced by a range of factors including changes in sea level, storminess, or sediment supply. These factors acting singly or in combination seem likely to change in the future. Understanding such responses remains a high priority and can be addressed by new technologies, such as light detection and ranging, optically stimulated luminescence dating, ground‐penetrating radar, and computer simulation.

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Intra‐shoreface erosion in response to rapid sea‐level fall: depositional record of a tectonically uplifted strand plain, Pacific coast of Japan

Cited by 48 publications

References 29 publications

Evidence for a transgressive barrier within a regressive strandplain system: Implications for complex coastal response to environmental change

Evidence for a transgressive barrier within a regressive strandplain system: Implications for complex coastal response to environmental change

Facies-Architecture Study of A Stepped, Forced Regressvie Compound Incised Valley In the Ferron Notom Delta, Southern Central Utah, U.S.A

Formation of beach‐ridge plains: an appreciation of the contribution by Jack L. Davies

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