Geomorphological evolution of the Rimac River’s Alluvial Fan, Lima, Peru

Sandra P. Villacorta, Kenneth G. Evans, Trinidad J. De Torres, Miguel Llorente, Nicanor Prendes

    Research output: Contribution to journalArticleResearchpeer-review

    Abstract

    The alluvial fan of Lima is a complex landform, resulting from the sediment contributions of the Rimac River and the coalescence of the alluvial fans of the tributaries of the Rimac River. Depositional zones in the fan and changing main channel and distributary channels are influenced by the palaeo-relief inherited from a semi-arid climate and by the climatic changes. The upper sedimentary sequence of the fan, dominant on the Costa Verde, is of Holocene age and was deposited about 4,000 years ago. The sediments forming it are non-cohesive and are highly mobile during floods and earthquakes. The dominant features in this sequence, intertwined channel facies and, laminar flows, were, influenced by the Holocene postglacial marine transgression. A deeper understanding of the evolution of the Lima alluvial fan provides insight in to the fan’s future evolution in the framework of active tectonics and climate change. The Lima fan is an area with high human population density and is subjected to floods and debris flows resulting in subsequent loss of human life and properties. Therefore, the improved understanding of the fan’s evolution, resulting from this study, will contribute to a better definition of high risk areas of potential human disaster caused by these natural processes. Cyclic fan development, presently controlled by glacial sea level lows and palaeo-topography will continue regards of human intervention in attempts to prevent natural disasters in Lima.
    Original languageEnglish
    Pages (from-to)409-424
    Number of pages16
    JournalGeosciences Journal
    Volume23
    Issue number3
    Early online date5 Oct 2018
    DOIs
    Publication statusPublished - 1 Jun 2019

    Fingerprint

    alluvial fan
    river
    Holocene
    climate change
    laminar flow
    natural disaster
    coalescence
    sedimentary sequence
    Postglacial
    debris flow
    transgression
    sediment
    landform
    tributary
    disaster
    population density
    relief
    topography
    sea level
    earthquake

    Cite this

    Villacorta, S. P., Evans, K. G., De Torres, T. J., Llorente, M., & Prendes, N. (2019). Geomorphological evolution of the Rimac River’s Alluvial Fan, Lima, Peru. Geosciences Journal, 23(3), 409-424. https://doi.org/10.1007/s12303-018-0049-5
    Villacorta, Sandra P. ; Evans, Kenneth G. ; De Torres, Trinidad J. ; Llorente, Miguel ; Prendes, Nicanor. / Geomorphological evolution of the Rimac River’s Alluvial Fan, Lima, Peru. In: Geosciences Journal. 2019 ; Vol. 23, No. 3. pp. 409-424.
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    abstract = "The alluvial fan of Lima is a complex landform, resulting from the sediment contributions of the Rimac River and the coalescence of the alluvial fans of the tributaries of the Rimac River. Depositional zones in the fan and changing main channel and distributary channels are influenced by the palaeo-relief inherited from a semi-arid climate and by the climatic changes. The upper sedimentary sequence of the fan, dominant on the Costa Verde, is of Holocene age and was deposited about 4,000 years ago. The sediments forming it are non-cohesive and are highly mobile during floods and earthquakes. The dominant features in this sequence, intertwined channel facies and, laminar flows, were, influenced by the Holocene postglacial marine transgression. A deeper understanding of the evolution of the Lima alluvial fan provides insight in to the fan’s future evolution in the framework of active tectonics and climate change. The Lima fan is an area with high human population density and is subjected to floods and debris flows resulting in subsequent loss of human life and properties. Therefore, the improved understanding of the fan’s evolution, resulting from this study, will contribute to a better definition of high risk areas of potential human disaster caused by these natural processes. Cyclic fan development, presently controlled by glacial sea level lows and palaeo-topography will continue regards of human intervention in attempts to prevent natural disasters in Lima.",
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    Villacorta, SP, Evans, KG, De Torres, TJ, Llorente, M & Prendes, N 2019, 'Geomorphological evolution of the Rimac River’s Alluvial Fan, Lima, Peru', Geosciences Journal, vol. 23, no. 3, pp. 409-424. https://doi.org/10.1007/s12303-018-0049-5

    Geomorphological evolution of the Rimac River’s Alluvial Fan, Lima, Peru. / Villacorta, Sandra P.; Evans, Kenneth G.; De Torres, Trinidad J.; Llorente, Miguel; Prendes, Nicanor.

    In: Geosciences Journal, Vol. 23, No. 3, 01.06.2019, p. 409-424.

    Research output: Contribution to journalArticleResearchpeer-review

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    AB - The alluvial fan of Lima is a complex landform, resulting from the sediment contributions of the Rimac River and the coalescence of the alluvial fans of the tributaries of the Rimac River. Depositional zones in the fan and changing main channel and distributary channels are influenced by the palaeo-relief inherited from a semi-arid climate and by the climatic changes. The upper sedimentary sequence of the fan, dominant on the Costa Verde, is of Holocene age and was deposited about 4,000 years ago. The sediments forming it are non-cohesive and are highly mobile during floods and earthquakes. The dominant features in this sequence, intertwined channel facies and, laminar flows, were, influenced by the Holocene postglacial marine transgression. A deeper understanding of the evolution of the Lima alluvial fan provides insight in to the fan’s future evolution in the framework of active tectonics and climate change. The Lima fan is an area with high human population density and is subjected to floods and debris flows resulting in subsequent loss of human life and properties. Therefore, the improved understanding of the fan’s evolution, resulting from this study, will contribute to a better definition of high risk areas of potential human disaster caused by these natural processes. Cyclic fan development, presently controlled by glacial sea level lows and palaeo-topography will continue regards of human intervention in attempts to prevent natural disasters in Lima.

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    Villacorta SP, Evans KG, De Torres TJ, Llorente M, Prendes N. Geomorphological evolution of the Rimac River’s Alluvial Fan, Lima, Peru. Geosciences Journal. 2019 Jun 1;23(3):409-424. https://doi.org/10.1007/s12303-018-0049-5