Evolution of late Holocene coastal dunes in the Cauvery delta region of Tamil Nadu, India

Alappat, Linto; Frechen, Manfred; Ramesh, R.; Tsukamoto, Sumiko; Srinivasalu, S.

doi:10.1016/j.jseaes.2011.05.019

Cited by 21 publications

(9 citation statements)

References 54 publications

(69 reference statements)

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“…The decreased intensity of livestock grazing (cattle, horses and sheep) has led to vegetation expansion in the Netherlands (Van Dijk, 1992). Similar patterns of dune stabilisation caused by changes in grazing pressure have been identified in Iceland (Runólfsson, 1987), Israel (Kutiel, 2001), New Zealand (Tribe and Kennedy, 2010) and India (Alappat et al, 2011). In addition, reduced grazing pressure, caused by the eradication of rabbit populations, was cited to have contributed to an acceleration of vegetation succession and dune stability in northwestern Europe and southern Australia (Moulton et al, 2019;Provoost et al, 2011).…”

Section: Asiasupporting

confidence: 54%

“…Increase of dune stability in Parangtritis, Indonesia, was caused by tourism urbanisation since the 1980s (Nehren et al, 2016). In India, mobile coastal dunes in the Cauvery delta were largely stabilised in 1980 and converted into plantations and cultivation lands (Alappat et al, 2011). Cultivation, recreation and sand mining activities, as well as the coastal erosion, had caused a loss of active dunes in Ovari, southeast India, during 1999(Mujabar and Chandrasekar, 2012, as well as dunes in Vengurla in western India (Noujas et al, 2019).…”

Section: Asiamentioning

confidence: 99%

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Coastal dune mobility over the past century: A global review

Gao

Kennedy

Konlechner

2020

Progress in Physical Geography: Earth and Environment

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The mobility of coastal dunes is characterised by bio-geomorphological responses related to change in boundary conditions, particularly sediment supply, wind and vegetation cover, as well as human activities. There remains uncertainty regarding the relative importance of these drivers on dune mobility at a global scale. In this study, trends and dominant drivers of coastal dune mobility are synthesised through the literature review focusing on shifts in dune mobility over the last century (1870–2018). In total, 176 individual dunes, with 55 dunes from the Europe-Mediterranean area, 23 from Africa, 30 from North America, 23 from South America, 20 from Oceania and 23 from Asia, are reviewed in this work. The results show that there is a worldwide trend of dune stabilisation, with 93% (164 out of 176) of the reviewed sites showing a loss of bare sand area due to an increase in vegetation cover and urbanisation expansion. Multiple factors have contributed to the stabilisation process, including (a) land-use change such as the change of traditional farming practises, coastal urbanisation and tourism development; (b) dune stabilisation projects; (c) sediment decline caused by the riverine and coastal constructions; and (d) change in climate (i.e. the decrease in windiness, and the increase in temperature and rainfall) and storms. Our results suggest human intervention played a dominant role in altering dune mobility for most dunes during the past century, while climate and storms are also important drivers, especially for dune sites with limited human activities.

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Section: Asiasupporting

confidence: 54%

Section: Asiamentioning

confidence: 99%

Coastal dune mobility over the past century: A global review

Gao

Kennedy

Konlechner

2020

Progress in Physical Geography: Earth and Environment

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“…8). Overdispersion values σ OD and σ OD(UL) are very low and range from 2±1% to 5±1%, typical for fully bleached sediments (Alappat et al 2011;Kunz et al 2010). In the radial plot, all samples show high precision values of around 25% and low relative errors of 3%.…”

Section: E Distribution Of Polymineral Fine Grain Samplesmentioning

confidence: 93%

“…The D E distributions of the polymineral fine grain samples WEH1-1, WEH2-1 and WEH2-3 are all unimodal and the statistical parameters are indicating a normal distribution, which is typical for fully bleached samples as, for example, dune sands (Alappat et al, 2011;Kunz et al, 2010). Based on the fluvial deposition of the sediments, incomplete bleaching of the polymineral fine grain samples has to be expected but cannot be detected from the D E distribution.…”

Section: Polymineral Fine Grain Samplesmentioning

confidence: 95%

Optically stimulated luminescence dating of young fluvial deposits of the Middle Elbe River Flood Plains using different age models

Kunz

Pflanz

Weniger³

et al. 2013

Geochronometria

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Abstract:In the last few decades optically stimulated luminescence (OSL) dating has become an important tool in geochronological studies. The great advantage of the method, i.e. dating the depositional age of sediments directly, can be impaired by incomplete bleaching of grains. This can result in a scattered distribution of equivalent doses (D E ), leading to incorrect estimation of the depositional age. Thoroughly tested protocols as well as good data analysis with adequate statistical methods are important to overcome this problem. In this study, samples from young fluvial sand and flood plain deposits from the Elbe River in northern Germany were investigated to compare its depositional ages from different age models with well-known historical dates. Coarse grain quartz (100-200 µm and 150-250 µm) and polymineral fine grains (4-11 µm) were dated using the single aliquot regenerative (SAR) dose protocol. The paleodose (D P ) was calculated from the D E data set using different approaches. Results were compared with the development of the Elbe River, which is well-documented by historical records and maps covering the last 1,000 years. Depending on the statistical approach it can be demonstrated that depositional ages significantly differ from the most likely depositional age. For the investigated coarse grain quartz samples all ages calculated from the MAM-3 UL , including their uncertainties, are within the historical documented age. Results of the polymineral fine grain samples are overestimating the historically documented depositional age, indicating undetectable incomplete bleaching. This study shows the importance of using an adequate statistical approach to calculate reliable OSL ages from fluvial sediments.

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“…This illustrates the significance of an alternative absolute geochronometer to determine the age of beach ridge formation. Optically stimulated luminescence (OSL) dating of sands, obtained from identified stratigraphic units, having sufficient lateral continuity, has been proved to be useful in the reconstruction of palaeo-shoreline and coastal evolution (Van Heteren et al, 2000;Bateman and Godby, 2004;Argyilan et al, 2005;Roberts and Plater, 2007;Porat and Botha, 2008;Clemmensen et al, 2009Clemmensen et al, , 2012Kunz et al, 2010;Reimann et al, 2010Reimann et al, , 2011Alappat et al, 2010Alappat et al, , 2011Bateman et al, 2011).…”

Section: Introductionmentioning

confidence: 99%