Paleoflood Hydrology

Kochel, R. Craig; Baker, Victor R.

doi:10.1126/science.215.4531.353

Cited by 260 publications

(121 citation statements)

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“…Sediments deposited by palaeofloods (Kochel and Baker, 1982) are of particular 45 interest because they can provide high resolution records of extreme hydrological 46 events occurring over short time periods, e.g. hours to days (Benito et al, 2004; 47 Baker, 2008).…”

mentioning

confidence: 99%

Reliability of equivalent-dose determination and age-models in the OSL dating of historical and modern palaeoflood sediments

Medialdea

Thomsen

Murray

et al. 2014

Quaternary Geochronology

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G. (2014). Reliability of equivalent-dose determination and age-models in the OSL dating of historical and modern palaeoflood sediments. Quaternary Geochronology, 22, 11-24. DOI: 10.1016/j.quageo.2014 Elsevier Editorial System(tm) for Quaternary Geochronology Manuscript DraftManuscript Number: QUAGEO-D-12-00096R1Title: Reliability of equivalent-dose determination and age-models in the OSL dating of historical and modern palaeoflood sediments Abstract: The challenge of accurately estimating the deposition age of incompletely-bleached samples in luminescence dating has motivated developments in the analysis of single grain dose distributions, and a number of statistical approaches have been proposed over the last few years. In this study, we compare the behaviour of the arithmetic average, the so-called 'robust statistics', the Central Age Model (CAM), the Minimum Age Model (MAM) and the Internal-External Consistency Criterion (IEU), when applied to single-grain and small multi-grain (~30 grains per aliquot) dose distributions from a sequence of eight recent (40-1000 years old) flash-flood deposits. These sediments are expected to be incompletely bleached, but all have age control from historical records. Modifications were made to allow the use of the standard CAM and MAM models with dose distributions containing near zero and negative dose values. An assessment of minimum uncertainty on individual dose estimates is based on the over-dispersion (OD) determined in dose recovery tests making use of gamma-irradiated samples. We then present a detailed analysis of the impact of appropriate uncertainty assignment on minimum (MAM and IEU) burial dose estimates. The results of the various models are discussed in terms of the accuracy of the resulting age, and we conclude that, overall, the IEU approach generates the most accurate ages. We also demonstrate that accurate IEU ages can be obtained from multi-grain measurements if an age off-set of ~40 years can be considered to be unimportant for the samples in question. From our study we conclude that these and similar young slack-water flood deposits can be accurately dated using quartz OSL, opening up the possibility of establishing time series of flood discharge in catchments for which no instrumental or historical record exists. 1Reliability of equivalent-dose determination and age-models in the OSL dating of 1 historical and modern palaeoflood sediments 2 3 Medialdea 1,3 , A., Thomsen 2 , K.J., Murray 3 , A.S., Benito 1 , G. 41. Museo Nacional de Ciencias Naturales, CSIC, Serrano 115bis, 28006 Madrid, 5Spain. amedialdea@mncn.csic.es 6 2. Center for Nuclear Technologies, Technical University of Denmark, DTU Risø 7Campus, Frederiksborgvej 399, 4000 Roskilde, Denmark. The challenge of accurately estimating the deposition age of incompletely-bleached 13 samples in luminescence dating has motivated developments in the analysis of 14 single grain dose distributions, and a number of statistical approaches have been 15proposed over the last few years. In this study, we comp...

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mentioning

confidence: 99%

Reliability of equivalent-dose determination and age-models in the OSL dating of historical and modern palaeoflood sediments

Medialdea

Thomsen

Murray

et al. 2014

Quaternary Geochronology

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“…Ceci explique la netteté du contact entre le banc de graviers et la zone d'affouillement, de même que son évidente correspondance avec le prolongement de la rive intérieure du tributaire mineur. Il est également possible qu'un reflux sur le tributaire majeur ait causé le dépôt de sédiments immé-diatement en amont de la rencontre des écoulements (Kochel et Baker, 1982) et ait ainsi contribué à la surélévation du banc d'accumulation ( fig. 3b).…”

Section: Upstream View Of the Contact Between The Scour Hole And The unclassified

Les effets d’un embâcle sur la morphologie du lit d’une confluence de cours d’eau

Bergeron¹,

Roy²

2007

gpq

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RÉSUMÉLa morphologie du lit aux confluences est particulièrement sensible aux changements dans le rapport des débits entre les tributaires. En milieu nordique, les embâcles de glace situés en amont des confluences peuvent modifier les débits des tributaires et ainsi affecter les conditions hydrauliques de la confluence. Au printemps 1986, nous avons observé les effets d'un embâcle sur la morphologie du lit d'une confluence située dans le bassin du ruisseau du Sud, en Estrie, au Québec (45°20'N, 7V20'W). La formation de l'embâcle et sa rupture ont entraîné l'accumulation d'un banc graveleux à l'entrée du tributaire majeur, le surcreusement du tributaire mineur et le déplacement de la zone d'affouillement. Depuis la débâcle, les conditions d'écoulement se sont stabilisées et les sédiments sont graduellement redistribués sur le lit. La confluence tend à retrouver une morphologie semblable à celle qui prévalait avant la crue printanière.

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“…Floodplain sediments have been used extensively to reconstruct paleoflood frequency in a wide variety of physiographic and climatic settings (Brackenridge, 1981;1988;Kochel and Baker, 1982;1988;Baker et al, 1983;Ely and Baker, 1985), but only recently has the method been applied to ice-jam floods. Along the Yukon River Livingston et al (2009) showed that floodplain exposures containing repetitive overbank flood-deposited sediment layers separated by organic material can be used to reconstruct long-term ice-jam flood frequency.…”

Section: Methodsmentioning

confidence: 99%

Application of Floodplain Stratigraphy to Determine the Recurrence of Ice-Jam Flooding Along the Lower Peace and Athabasca Rivers, Alberta

Hugenholtz¹,

Smith²,

Livingston³

2009

Canadian Water Resources Journal

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Multi-proxy reconstructions of ice-jam flooding have increased significantly in the last several decades, providing important estimates of changes in ice-jam activity over time. Here, the floodplain sedimentary archive is investigated as a stratigraphic proxy indicator of ice-jam flooding along the lower Peace and Athabasca Rivers, Alberta. This relatively new method involves stratigraphic logging and interpretation of floodplain sediments resulting from successive ice jam floods and radiocarbon dating of inter-flood organic material for chronology (Livingston et al., 2009). At six sites the method is used to extend the record of ice-jam flooding by up to 1500 years, providing the longest temporal framework for assessing the recurrence of ice-jam flooding in the Peace-Athabasca Delta (PAD) to date. Chronostratigraphic logs indicate that the average long-term recurrence interval of ice-jam flooding varies between sites, from approximately once in 13 years to once in 23 years (4-8% probability of bankfull exceedence in any given year). This is near the range interpreted from oxbow lake sediment in the PAD spanning the last 180-300 years (5-14%), but much lower than the probability of recurrence of ice-jam floods (AD 1826-1995) inferred from historic archives (16%). Although spatio-temporal incongruencies amongst proxy records make it difficult to resolve differences among flood recurrence estimates for the PAD, they collectively indicate a range of 4-16%.The temporal resolution of ice jam-flood chronologies derived from floodplain sediment depends largely on the availability, reliability and sampling frequency of radiocarbon-dated organic material and its calibration to calendar years. Changes in the frequency of ice jams at a particular site can be determined when organic material suitable for radiocarbon dating is present at multiple levels in the floodplain sedimentary archive. Alternative absolute dating methods should be used to constrain ice-jam flood events in the last 350 years or when organic material suitable for radiocarbon dating is limited. Even with limited chronometric control the average long-term flood recurrence can be determined, providing a first approximation of ice-jam flood activity at a particular site. Thus, in the absence of other proxy archives, and given the simplicity of the method, we suggest that floodplain stratigraphy provides an invaluable archive of ice-jam flooding along northern rivers.

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Paleoflood Hydrology

Cited by 260 publications

References 26 publications

Reliability of equivalent-dose determination and age-models in the OSL dating of historical and modern palaeoflood sediments

Reliability of equivalent-dose determination and age-models in the OSL dating of historical and modern palaeoflood sediments

Les effets d’un embâcle sur la morphologie du lit d’une confluence de cours d’eau

Application of Floodplain Stratigraphy to Determine the Recurrence of Ice-Jam Flooding Along the Lower Peace and Athabasca Rivers, Alberta

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