Understanding the impacts of Late Quaternary climate change in tropical and sub-tropical regions

Thomas, Michael F.

doi:10.1016/j.geomorph.2008.05.026

Cited by 51 publications

(41 citation statements)

References 93 publications

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“…Portanto, é coerente que, no intervalo de tempo entre a deposição dos dois materiais, uma mudança na dinâmica hidrológi-ca induzida provavelmente pela neotectônica tenha sido responsável pelo primeiro registro de reorganização da drenagem da bacia. A hipótese de deformações neotectônicas durante o Pleistoceno Superior é corroborada por levantamentos paleoclimáticos realizados no âmbito do estado de São Paulo e do continente sul-americano (Coltrinari, 1991;Lichte, 1991;Thomas;Thorp, 1995;Scheel-Ybert et al, 2003;Ortiz-Jaureguizar;Cladera, 2006;Thomas, 2008), os quais não observaram oscilações ambientais significativas durante o período em que as idades foram obtidas, afastando a hipó-tese de que esses terraços estariam relacionados às flutuações do clima pretérito.…”

Section: Geocronologia Dos Eventos Na Bacia Hidrográfica Do Ribeirão unclassified

Mudanças na dinâmica fluvial da bacia hidrográfica do Ribeirão Araquá: eventos tectônicos e climáticos no quaternário

Souza¹,

Filho²

2016

GEOUSP (Online)

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O presente trabalho apresenta os resultados dos estudos sobre a dinâmica geomorfológica quaternária da bacia do Ribeirão Araquá, municípios de São Pedro e Charqueada-SP. O trabalho parte do pressuposto que eventos neotectônicos e climáticos influenciaram na mudança da dinâmica fluvial desta bacia. Deste modo, o objetivo principal dessa pesquisa foi investigar a relação destes eventos com a elaboração de dois níveis de altos terraços e das linhas de cascalhos identificadas nos mesmos. Foram utilizados parâmetros fluvio-morfométricos e datações de sedimentos fluviais através da Luminescência Opticamente Estimulada (LOE). Os resultados apontaram para a coalescência de eventos neotectônicos durante o Pleistoceno Superior e climáticos na transição Pleistoceno Superior-Holoceno, sendo responsáveis pelas alterações no nível de base e formação dos terraços fluviais.

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Section: Geocronologia Dos Eventos Na Bacia Hidrográfica Do Ribeirão unclassified

Mudanças na dinâmica fluvial da bacia hidrográfica do Ribeirão Araquá: eventos tectônicos e climáticos no quaternário

Souza¹,

Filho²

2016

GEOUSP (Online)

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“…Importantly, the T2 terrace that was dated to the midHolocene (8-5 ka) indicates the existence of a period of regional aggradation not recognised in previous studies (Thomas et al, 2007). Wet Tropics fluvial activity during the mid to late Holocene was considered to be dominated by the removal of alluvium (Thomas et al, 2007;Thomas, 2008).…”

Section: Thesis Key Findingsmentioning

confidence: 83%

“…At the global scale, the geomorphology of the humid tropics is poorly understood (Latrubesse et al, 2005;Syvitski et al, 2014). Consequently, the relevance of existing geomorphic concepts (predominantly derived from temperate settings) to tropical fluvial forms is not well understood (Thomas et al, 2008;Wohl et al, 2012). Effectively addressing this knowledge gaps requires research with a broad focus (Piegay et al, 2015), which enables the identification of regional river responses (i.e.…”

Section: Resultsmentioning

confidence: 99%

“…By contrast the geomorphology of the tropics is relatively poorly understood (Thomas and Thorp, 1995;Latrubesse et al, 2005;Thomas, 2008;Sinha et al, 2012) and the relevance of existing theory remains unclear (Thomas, 2008). For example, the humid tropics are recognised as geomorphic hotspots given the unique hydrology that results in greater energy inputs and faster rates of change (Wohl et al, 2012).…”

Section: Translating Theory Into Practice: Implications For the Expermentioning

confidence: 99%

“…However, a lack of terrace studies in the tropics results in underrepresentation of these important regional archives (Latrubesse et al, 2005;Thomas, 2008;Sinha et al, 2012). The preservation of terraces in Wet Tropics catchments was noted in earlier studies (Thomas et al, 2007), however, no systematic study of their distribution, surface, sedimentary, age characteristics, or correlations had been undertaken.…”

Section: Thesis Key Findingsmentioning

confidence: 99%

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River response and climate change in the Wet Tropics, northeast Queensland Australia

Hughes¹

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An improved understanding of the relationship between climate change and river response is critical for predicting future trajectories of fluvial landforms. This is particularly important with climate change projections showing an increase in extreme events such as floods and cyclones. In Australia and internationally, a valuable record of river response has been developed from the morphologic and sedimentologic archives of river terraces and floodplains, mainly in temperate regions. These studies reveal the key role of climate over timescales ranging from 100 kyr glacial/interglacial cycles through to decadal cycles driven by the El Niño Southern Oscillation (ENSO). However, the understanding of fluvial records in the humid (wet) tropics is comparatively poor despite these regions being geomorphic hotspots for catastrophic change. The relevance of key geomorphic concepts to wet tropical rivers is largely unknown and therefore the knowledge gained from studying these settings is invaluable. The overarching aim of this thesis is to characterise the nature of regional river response and its relationship to climatic change in the Wet Tropics of tropical northeast Queensland, Australia. Chapters 2 to 6 explore the various aspects of this research question and an overall synthesis of the thesis key findings and future research priorities is presented in Chapter 7.Chapter 2 presents the research on terrace distribution and chronostratigraphic characteristics to provide the overall spatial context of river landforms across five catchments. Two terraces are correlated and mapped across the study area, while the terrace chronology details two periods of aggradation-incision that post-date the Last Glacial Maximum. Explanations for spatial differences in terrace preservation are explored using a range of catchment force-resistance variables with the results underpinning a new conceptual model of terrace types and preservation processes. Author A. Sharma Data collection (sediment dating data in Table 3) (10%).v i i Contributions by others to the thesisChapter 2: Hughes, K., Croke, J., Bartley, R., Thompson, C., Sharma, A.Alluvial terrace preservation in the Wet Tropics, northeast Queensland, Australia. KH was responsible for 70% of conception and design, 90% of data collection, 80% of data analysis and interpretation, and 60% of writing and editing. JC was responsible for 30% of conception and design, 20% of data analysis and interpretation, and 20% of writing and editing. RB was responsible for 10% of writing and editing. CT was responsible for 10% of data analysis and interpretation and 10% of writing and editing. AS was responsible for 10% of data collection.Chapter 3: Hughes, K., Croke, J., Thompson, C., Sharma, A., K. Tilly.KH was responsible for 70% of conception and design, 90% of data collection, 80% of data analysis and interpretation, and 75% of writing and editing. JC was responsible for 30% of conception and design, 10% of data analysis and interpretation, and 20% of writing and editing. CT was respon...

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Introduction

Metcalfe

Nash

2012

Quaternary Environmental Change in the Tropics

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Understanding the impacts of Late Quaternary climate change in tropical and sub-tropical regions

Cited by 51 publications

References 93 publications

Mudanças na dinâmica fluvial da bacia hidrográfica do Ribeirão Araquá: eventos tectônicos e climáticos no quaternário

Mudanças na dinâmica fluvial da bacia hidrográfica do Ribeirão Araquá: eventos tectônicos e climáticos no quaternário

River response and climate change in the Wet Tropics, northeast Queensland Australia

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