Holocene beach deposits for assessing coastal uplift of the northeastern Boso Peninsula, Pacific coast of Japan

Tamura, Takeshi; Murakami, Fumitoshi; Watanabe, Kazuaki

doi:10.1016/j.yqres.2010.07.009

Cited by 32 publications

(18 citation statements)

References 21 publications

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“…The Hasunuma area consists of a sandy beach (150–200 m wide), with foredune ridges (500–1000 m wide, up to 5 m in elevation), and an inter‐ridge swale (Tamura et al . ) (Figs c, ). The study area is separated from the sea by a foredune and is dominated by coniferous trees ( Pinus ).…”

Section: Introductionmentioning

confidence: 78%

Geochemical characteristics of deposits from the 2011 Tohoku‐oki tsunami at Hasunuma, Kujukuri coastal plain, Japan

et al. 2016

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We examined the geochemical characteristics and temporal changes of deposits associated with the 2011 Tohoku‐oki tsunami. Stable carbon isotope ratios, biomarkers, and water‐leachable ions were measured in a sandy tsunami deposit and associated soils sampled at Hasunuma, Kujukuri coastal plain, Japan, in 2011 and 2014. At this site, the 2011 tsunami formed a 10–30 cm ‐thick layer of very fine to medium sand. The tsunami deposit was organic‐poor, and no samples contained any detectable biomarkers of either terrigenous or marine origin. In the underlying soil, we identified hydrocarbons and sterols derived from terrestrial plants, but detected no biomarkers of marine origin. In the samples collected in 2011, concentrations of tsunami‐derived water‐leachable ions were highest in the soil immediately beneath the tsunami deposit and then decreased gradually with depth. Because of its finer texture and higher organic content, the soil has a higher water‐holding capacity than the sandy tsunami deposit. This distribution suggests that ions derived from the tsunami quickly penetrated the sand layer and became concentrated in the underlying soil. In the samples collected in 2014, concentrations of water‐leachable ions were very low in both soil and sand. We attribute the decrease in ion concentrations to post‐tsunami rainfall, seepage, and seasonal changes in groundwater level. Although water‐leachable ions derived from seawater were concentrated in the soil beneath the tsunami deposit following the tsunami inundation, they were not retained for more than a few years. To elucidate the behavior of geochemical characteristics associated with tsunamis, further research on organic‐rich muddy deposits (muddy tsunami deposits and soils beneath sandy tsunami deposits) as well as sandy tsunami deposits is required.

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Section: Introductionmentioning

confidence: 78%

Geochemical characteristics of deposits from the 2011 Tohoku‐oki tsunami at Hasunuma, Kujukuri coastal plain, Japan

et al. 2016

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“…Accumulation rates along Transects A, B, and C range between 16 and 54 m 3 m −1 yr −1 ( Table 2). The calculated average accumulation rate is exceptionally high compared to that reported for other large beachridge systems, such as 0.05 million m 3 yr −1 at Guichen Bay, Australia (Bristow and Pucilllo, 2006), 0.14 million m 3 yr −1 at Keppel Bay, Australia (Brooke et al, 2008a), and 1.7 million m 3 yr −1 at Kujukuri, Japan (Tamura et al, 2010). As these systems are much shorter than the UsumacintaGrijalva plain, accumulation rates are more similar when expressed in m 3 m −1 yr −1 .…”

Section: Volumetric Growth Rate Of the Beach-ridge Plainmentioning

confidence: 52%

The Usumacinta–Grijalva beach-ridge plain in southern Mexico: a high-resolution archive of river discharge and precipitation

et al. 2017

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Abstract. The beach-ridge sequence of the Usumacinta-Grijalva delta borders a 300 km long section of the southern Gulf of Mexico coast. With around 500 beach ridges formed in the last 6500 years, the sequence is unsurpassed in the world in terms of numbers of individual ridges preserved, continuity of the record, and temporal resolution. We mapped and dated the most extensively accreted part of the sequence, linking six phases of accretion to river mouth reconfigurations and constraining their ages with 14 C and OSL dating. The geomorphological and sedimentological reconstruction relied on lidar data, coring transects, GPR measurements, grain-size analyses, and chemical fingerprinting of volcanic glass and pumice encountered within the beach and dune deposits.We demonstrate that the beach-ridge complex was formed under ample long-term fluvial sediment supply and shorter-term wave-and aeolian-modulated sediment reworking. The abundance of fluvially supplied sand is explained by the presence of easily weatherable Los Chocoyos ignimbrites from the ca. 84 ka eruption of the Atitlán volcano (Guatemala) in the catchment of the Usumacinta River. Autocyclic processes seem responsible for the formation of ridge-swale couplets. Fluctuations in their periodicity (ranging from 6-19 years) are governed by progradation rate, and are therefore not indicative of sea level fluctuations or variability in storm activity. The fine sandy beach ridges are mainly swash built. Ridge elevation, however, is strongly influenced by aeolian accretion during the time the ridge is located next to the beach. Beach-ridge elevation is negatively correlated with progradation rate, which we relate to the variability in sediment supply to the coastal zone, reflecting decadal-scale precipitation changes within the river catchment. In the southern Mexican delta plain, the coastal beach ridges therefore appear to be excellent recorders of hinterland precipitation.

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“…The interface between the foreshore and the shoreface observed in GPR images has also been used and dated to infer sea-level trends2021434445. Some of these studies have focused on proving the reliability of this marker as a proxy of sea-level position by comparing recorded morphologies (morphology-slope of the reflections) with the present-day morphology of the foreshore and shoreface4346.…”

Section: Sea-level Indicators and Coastal Barriersmentioning

confidence: 99%

Coastal barrier stratigraphy for Holocene high-resolution sea-level reconstruction

Costas

Ferreira

Plomaritis

et al. 2016

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The uncertainties surrounding present and future sea-level rise have revived the debate around sea-level changes through the deglaciation and mid- to late Holocene, from which arises a need for high-quality reconstructions of regional sea level. Here, we explore the stratigraphy of a sandy barrier to identify the best sea-level indicators and provide a new sea-level reconstruction for the central Portuguese coast over the past 6.5 ka. The selected indicators represent morphological features extracted from coastal barrier stratigraphy, beach berm and dune-beach contact. These features were mapped from high-resolution ground penetrating radar images of the subsurface and transformed into sea-level indicators through comparison with modern analogs and a chronology based on optically stimulated luminescence ages. Our reconstructions document a continuous but slow sea-level rise after 6.5 ka with an accumulated change in elevation of about 2 m. In the context of SW Europe, our results show good agreement with previous studies, including the Tagus isostatic model, with minor discrepancies that demand further improvement of regional models. This work reinforces the potential of barrier indicators to accurately reconstruct high-resolution mid- to late Holocene sea-level changes through simple approaches.

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Holocene beach deposits for assessing coastal uplift of the northeastern Boso Peninsula, Pacific coast of Japan

Cited by 32 publications

References 21 publications

Geochemical characteristics of deposits from the 2011 Tohoku‐oki tsunami at Hasunuma, Kujukuri coastal plain, Japan

Geochemical characteristics of deposits from the 2011 Tohoku‐oki tsunami at Hasunuma, Kujukuri coastal plain, Japan

The Usumacinta–Grijalva beach-ridge plain in southern Mexico: a high-resolution archive of river discharge and precipitation

Coastal barrier stratigraphy for Holocene high-resolution sea-level reconstruction

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