Extraordinary hydro-climatic events during the period AD 200−300 recorded by slackwater deposits in the upper Hanjiang River valley, China

Huang, Chun Chang; Pang, Jiangli; Zha, Xiaochun; Zhou, Yali; Shuyan, Yin; Su, Hongxia; Zhou, Linfeng; Yang, Jing

doi:10.1016/j.palaeo.2013.02.001

Cited by 65 publications

(39 citation statements)

References 27 publications

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“…The chronological framework was established in the NGK profile initially by pedostratigraphic correlation with the dated Holocene loess-soil profiles at the adjacent sites in the upper reaches of the Hanjiang River basin Huang et al, 2013;Zhang et al, 2013;Pang et al, 2011;Gu et al, 2012). More accurate dating was based on the OSL ages (Singhvi and Krbetschek, 1996;Aitken, 1998), which were obtained from the samples taken from the NGK profile in the upper reach gorges of the Hanjiang River ( Table 2).…”

Section: Dating Of the Paleoflood Eventsmentioning

confidence: 99%

Paleofloods recorded by slackwater deposits in the upper reaches of the Hanjiang River valley, middle Yangtze River basin, China

Wang

Huang

Pang

et al. 2014

Journal of Hydrology

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Section: Dating Of the Paleoflood Eventsmentioning

confidence: 99%

Paleofloods recorded by slackwater deposits in the upper reaches of the Hanjiang River valley, middle Yangtze River basin, China

Wang

Huang

Pang

et al. 2014

Journal of Hydrology

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“…Results confirm, however, that flood deposits are readily observed in these settings that can considerably broaden the scope for palaeoflood hydrology across the globe. Like previous studies (e.g., Kale et al, 2010;Zhang et al, 2012, Huang et al, 2013Wasson et al, 2013), there now seems to be general consensus that SWD can move beyond the bedrock gorge, where well-preserved flood units are found in flow expansive and backwater settings, serving as a useful addition to sample settings. Importantly, the macrochannel settings of SEQ fulfil the stable boundary conditions required to provide robust discharge estimates because they have experienced minimal channel adjustments over the past 200 years (Fryirs et al, 2015;Thompson et al, 2016) and even over the longer timescale of the Holocene (Croke et al, 2016a(Croke et al, , 2016bDaley et al, 2016).…”

Section: Recognised Challenges In the Application Of Swd To Flood Estmentioning

confidence: 56%

Beyond the gorge: Palaeoflood reconstruction from slackwater deposits in a range of physiographic settings in subtropical Australia

et al. 2017

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The application of palaeoflood hydrology in Australia has been limited since its initial introduction more than 30 years ago. This study adopts a regional, field-based approach to sampling slackwater deposits in a subtropical setting in southeast Queensland beyond the traditional arid setting. We explore the potential and challenges of using sites outside the traditional physiographical setting of bedrock gorges. Over 30 flood units were identified across different physiographical settings using a range of criteria. Evidence of charcoal-rich layers and palaeosol development assisted in the identification and separation of distinct flood units. The OSL-dated flood units are relatively young with two-thirds of the samples being <1000 years old. The elevation of all flood units have resulted in estimated minimum discharges greater than the 1% annual exceedance probability. Although these are in the same order of gauged flood magnitudes, >80% of them classified as 'extreme event'. This study opens up the renewed possibility of applying palaeoflood hydrology to more populated parts of Australia where the need for improved estimation of flood frequency and magnitude is now urgent in light of several extreme flood events. Preliminary contributions to improve the understanding between high magnitude floods and regional climatic drivers are also discussed. Recognised regional extreme floods generally coincide with La Niña and negative IPO phases, while tropical cyclones appear to be a key weather system in generating such large floods.

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“…Therefore, palaeoflood sequences represent a promising source for understanding the long-term hazard dynamics of the unperturbed climate system (e.g. Kochel and Baker, 1982;Stedinger and Cohn, 1986;Baker, 1987Baker, , 2006Ely et al, 1993;O'Connor et al, 1994;Knox, 2000;Yang et al, 2000;Greenbaum et al, 2000;Redmond et al, 2002;Benito et al, 2004;Czymzik et al, 2010;Huang et al, 2013;Swierczynski et al, 2013;Wirth et al, 2013). One important aspect of these dynamics is to understand to what extent flood frequencies can be considered constant over time, and more specifically, whether floods in a given geographic region have any correlations with themselves and whether the floods are clustered in time.…”

Section: Introductionmentioning

confidence: 99%

Analysis and modelling of a 9.3 kyr palaeoflood record: correlations, clustering, and cycles

Witt

Malamud

Mangili

et al. 2017

Hydrol. Earth Syst. Sci.

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Abstract. In this paper, we present a unique 9.5 m palaeolacustrine record of 771 palaeofloods which occurred over a period of 9.3 kyr in the Piànico-Sèllere Basin (southern Alps) during an interglacial period in the Pleistocene (sometime from 780 to 393 ka) and analyse its correlation, clustering, and cyclicity properties. We first examine correlations, by applying power-spectral analysis and detrended fluctuation analysis (DFA) to a time series of the number of floods per decade, and find weak long-range persistence: a power-spectral exponent β PS ≈ 0.39 and an equivalent power-spectral exponent from DFA, β DFA ≈ 0.25. We then examine clustering using the one-point probability distribution of the inter-flood intervals and find that the palaeofloods cluster in time as they are Weibull distributed with a shape parameter k W = 0.78. We then examine cyclicity in the time series of number of palaeofloods per year, and find a period of about 2030 years. Using these characterizations of the correlation, clustering, and cyclicity in the original palaeoflood time series, we create a model consisting of the superposition of a fractional Gaussian noise (FGN) with a 2030-year periodic component and then peaks over threshold (POT) applied. We use this POT FGN+Period model to create 2 600 000 synthetic realizations of the same length as our original palaeoflood time series, but with varying intensity of periodicity and persistence, and find optimized model parameters that are congruent with our original palaeoflood series. We create long realizations of our optimized palaeoflood model, and find a high temporal variability of the flood frequency, which can take values of between 0 and > 30 floods century −1 . Finally, we show the practical utility of our optimized model realizations to calculate the uncertainty of the forecasted number of floods per century with the number of floods in the preceding century. A key finding of our paper is that neither fractional noise behaviour nor cyclicity is sufficient to model frequency fluctuations of our large and continuous palaeoflood record, but rather a model based on both fractional noise superimposed with a long-range periodicity is necessary.

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Extraordinary hydro-climatic events during the period AD 200−300 recorded by slackwater deposits in the upper Hanjiang River valley, China

Cited by 65 publications

References 27 publications

Paleofloods recorded by slackwater deposits in the upper reaches of the Hanjiang River valley, middle Yangtze River basin, China

Paleofloods recorded by slackwater deposits in the upper reaches of the Hanjiang River valley, middle Yangtze River basin, China

Beyond the gorge: Palaeoflood reconstruction from slackwater deposits in a range of physiographic settings in subtropical Australia

Analysis and modelling of a 9.3 kyr palaeoflood record: correlations, clustering, and cycles

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Extraordinary hydro-climatic events during the period AD 200−300 recorded by slackwater deposits in the upper Hanjiang River valley, China

Cited by 65 publications

References 27 publications

Paleofloods recorded by slackwater deposits in the upper reaches of the Hanjiang River valley, middle Yangtze River basin, China

Paleofloods recorded by slackwater deposits in the upper reaches of the Hanjiang River valley, middle Yangtze River basin, China

Beyond the gorge: Palaeoflood reconstruction from slackwater deposits in a range of physiographic settings in subtropical Australia

Analysis and modelling of a 9.3 kyr palaeoflood record: correlations, clustering, and cycles

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Analysis and modelling of a 9.3 kyr palaeoflood record: correlations, clustering, and cycles