Principles of Alluvial Fan Morphology

Bowman, Dan

doi:10.1007/978-94-024-1558-2

Cited by 45 publications

(56 citation statements)

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“…The catchment sourcing fan 2 is unique in having few terraces and an abundance of large colluvial/alluvial fans that feed sediment from tributaries into the braided river channels of the main valley (Figure 6). Fans can act as buffers of hillslope-channel connectivity when aggrading under high sediment supply conditions (Bowman, 2018;Mather et al, 2017). On the other hand, they can be effective hillslope-channel couplers if the sediment supply from upstream is limited and incision is focused on the fan itself, thereby promoting the remobilisation of previously stored sediment (Bowman, 2018;Mather et al, 2017).…”

Section: Climate and Hillslope-channel Connectivitymentioning

confidence: 99%

“…Fans can act as buffers of hillslope-channel connectivity when aggrading under high sediment supply conditions (Bowman, 2018;Mather et al, 2017). On the other hand, they can be effective hillslope-channel couplers if the sediment supply from upstream is limited and incision is focused on the fan itself, thereby promoting the remobilisation of previously stored sediment (Bowman, 2018;Mather et al, 2017). The majority of the alluvial/colluvial fans within the catchment have minimal or concave breaks in slope at their toe, indicative of fan aggradation in the absence of main valley incision that would otherwise produce scarps.…”

Section: Climate and Hillslope-channel Connectivitymentioning

confidence: 99%

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Impact of climate on landscape form, sediment transfer and the sedimentary record

Harries

Gailleton

Kirstein

et al. 2021

Earth Surf Processes Landf

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The relationship between climate, landscape connectivity and sediment export from mountain ranges is key to understanding the propagation of erosion signals downstream into sedimentary basins. We explore the role of connectivity in modulating the composition of sediment exported from the Frontal Cordillera of the southcentral Argentine Andes by comparing three adjacent and apparently similar semiglaciated catchment-fan systems within the context of an along-strike precipitation gradient. We first identify that the bedrock exposed in the upper, previously glaciated reaches of the cordillera is under-represented in the lithological composition of gravels on each of three alluvial fans. There is little evidence for abrasion or preferen-

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Section: Climate and Hillslope-channel Connectivitymentioning

confidence: 99%

Section: Climate and Hillslope-channel Connectivitymentioning

confidence: 99%

Impact of climate on landscape form, sediment transfer and the sedimentary record

Harries

Gailleton

Kirstein

et al. 2021

Earth Surf Processes Landf

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“…Свързаните с алувиалните конуси природни опасности са обект на многобройни изследвания в последните години. Най-пълно са разгледани от Bowman (2019), National Research Council (NRC, 1996 и др. От гледна точка на честотата на тяхната проява те са подредени в следната последователност: 1) опасности от проява на дебритни потоци и дебритни наводнения; 2) опасности от внезапна промяна на речното корито (channel avulsion); 3) активизиране на разломи.…”

Section: алувиални конуси и свързаните с тях природни опасностиunclassified

Alluvial fan of Glazne river, Bansko town, SW Bulgaria

Gerdjikov¹,

Dotseva²,

Gikov

et al. 2021

Rev. Bulg. Geol. Soc.

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At the place where Banderitsa and Demyanitsa rivers and their tributaries ceased to be confined to their narrow valleys one of the most impressive alluvial fans in South Bulgaria is formed – the one of Glazne river. The river valley morphology, as well as the evolution and the position of the Glazne fan, are controlled by the active normal faulting in the NE slopes and foot of Pirin Mountain. Тhe Quaternary glaciations produced large volumes of debris in the river valleys. There is an agreement that the processes of sediment transfer from the mountain to the Razlog graben have been highly active at the time and immediately after the Pleistocene glaciations. As a result, in the Bulgarian geological and geomorphological reports and scientific papers, the age of the alluvial fans at the NE foot of Pirin Mountain is assumed to be Late Pleistocene–Early Holocene. The results of our studies require a re-evaluation of these ideas. Using widely accepted methods for natural hazard assessment, our field and historical research and analysis allow us to claim that the Glazne fan is active. Parts of Bansko, that are situated in the upper-middle parts of the alluvial fan, have been affected by at least two significant debris floods during the XX century. The conducted measures to control river behavior have an important effect on risk reduction, yet they lead to significant modification of the zones of active aggradation and this means that new actions against future events must be taken.

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“…2005; De Haas et al . 2015, 2019; Bowman 2019). Whereas most studies have emphasized these two types of alluvial fans, there is increasing recognition of the existence of a continuum of landforms, which reflect interactions between processes and intermediate‐type flows (Wells & Harvey 1987; Hungr et al .…”

Section: Figurementioning

confidence: 99%

Holocene alluvial fan evolution, Schmidt‐hammer exposure‐age dating and paraglacial debris floods in theSEJostedalsbreen region, southern Norway

Matthews

McEwen

Owen

et al. 2020

Boreas

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The evolution of several sub‐alpine alluvial fans SE of the Jostedalsbreen ice cap was investigated based on their geomorphology and Schmidt‐hammer exposure‐age dating (SHD) applied to 47 boulder deposits on the fan surfaces. A debris‐flood rather than debrisflow or water‐flow origin for the deposits was inferred from their morphology, consisting of low ridges with terminal splays up to 100 m wide without lateral levees. This was supported by fan, catchment, and boulder characteristics. SHD ages ranged from 9480±765 to 1955±810 years. The greatest number of boulder deposits, peak debris‐flood activity and maximum fan aggradation occurred between ̃9.0 and 8.0 ka, following regional deglaciation at ̃9.7 ka. The high debris concentrations necessary for debris floods were attributed to paraglacial processes enhanced by unstable till deposits on steep slopes within the catchments. From ̃8.0 ka, fan aggradation became progressively less as the catchment sediment sources tended towards exhaustion, precipitation decreased during the Holocene Thermal Maximum, and tree cover increased. After ̃4.0 ka, some areas of fan surfaces stabilized, while Late‐Holocene climatic deterioration led to renewed fan aggradation in response to the neoglacial growth of glaciers, culminating in the Little Ice Age. These changes are generalized within a conceptual model of alluvial fan evolution in this recently‐deglaciated mountain region and in glacierized catchments. This study highlights the potential importance of debris floods, of which relatively little is known, especially in the context of alluvial fan evolution.

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Principles of Alluvial Fan Morphology

Cited by 45 publications

References 0 publications

Impact of climate on landscape form, sediment transfer and the sedimentary record

Impact of climate on landscape form, sediment transfer and the sedimentary record

Alluvial fan of Glazne river, Bansko town, SW Bulgaria

Holocene alluvial fan evolution, Schmidt‐hammer exposure‐age dating and paraglacial debris floods in theSEJostedalsbreen region, southern Norway

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