Dune mobility and vegetation cover in the Southwest Kalahari desert

Giles F.S. Wiggs, David S.G. Thomas, Joanna E. Bullard, Ian Livingstone

    Research output: Contribution to Book/Report typesChapter

    Abstract

    As part of a wider project investigating the palaeoenvironmental significance of partially vegetated linear dunes in the southwest Kalahari, data collected in the latter part of 1992 concerning dune movement and vegetation cover suggest that sediment transport is occurring on some dune surfaces, and that the majority of surface activity occurs on the crests and upper slopes of the dunes. The data suggest that the limiting variables on surface sediment movement vary on different parts of a dune. On interdunes and lower dune slopes the primary limiting variable is available wind energy, while on dune crests and upper slopes it is vegetation cover. Ground cover by litter has much greater importance in protecting the surface sediment from erosion than rooted vegetation, From individual data points, no evidence is found to support a threshold vegetation cover below which sediment movement occurs, Rather, a gradient of activity is suggested whereby a reduction in vegetation cover increases the potential for sediment movement and surface change. However, dunes with differing amounts of mean vegetation cover display differing degrees of surface activity, and at this scale, a vegetation cover threshold in the region of 14 per cent may be recognized.
    Original languageEnglish
    Title of host publicationEarth Surface Processes and Landforms
    Pages515-529
    Number of pages15
    DOIs
    Publication statusPublished - 1995

    Publication series

    NameEarth Surface Processes and Landforms
    Volume20

    Fingerprint

    vegetation cover
    dune
    desert
    sediment
    ground cover
    sediment transport
    litter
    erosion
    vegetation
    energy

    Keywords

    • Kalahari Desert
    • dune movement
    • linear dunes
    • sediment transport
    • vegetation cover

    Cite this

    Wiggs, G. F. S., Thomas, D. S. G., Bullard, J. E., & Livingstone, I. (1995). Dune mobility and vegetation cover in the Southwest Kalahari desert. In Earth Surface Processes and Landforms (pp. 515-529). (Earth Surface Processes and Landforms; Vol. 20). https://doi.org/10.1002/esp.3290200604
    Wiggs, Giles F.S. ; Thomas, David S.G. ; Bullard, Joanna E. ; Livingstone, Ian. / Dune mobility and vegetation cover in the Southwest Kalahari desert. Earth Surface Processes and Landforms. 1995. pp. 515-529 (Earth Surface Processes and Landforms).
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    abstract = "As part of a wider project investigating the palaeoenvironmental significance of partially vegetated linear dunes in the southwest Kalahari, data collected in the latter part of 1992 concerning dune movement and vegetation cover suggest that sediment transport is occurring on some dune surfaces, and that the majority of surface activity occurs on the crests and upper slopes of the dunes. The data suggest that the limiting variables on surface sediment movement vary on different parts of a dune. On interdunes and lower dune slopes the primary limiting variable is available wind energy, while on dune crests and upper slopes it is vegetation cover. Ground cover by litter has much greater importance in protecting the surface sediment from erosion than rooted vegetation, From individual data points, no evidence is found to support a threshold vegetation cover below which sediment movement occurs, Rather, a gradient of activity is suggested whereby a reduction in vegetation cover increases the potential for sediment movement and surface change. However, dunes with differing amounts of mean vegetation cover display differing degrees of surface activity, and at this scale, a vegetation cover threshold in the region of 14 per cent may be recognized.",
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    Wiggs, GFS, Thomas, DSG, Bullard, JE & Livingstone, I 1995, Dune mobility and vegetation cover in the Southwest Kalahari desert. in Earth Surface Processes and Landforms. Earth Surface Processes and Landforms, vol. 20, pp. 515-529. https://doi.org/10.1002/esp.3290200604

    Dune mobility and vegetation cover in the Southwest Kalahari desert. / Wiggs, Giles F.S.; Thomas, David S.G.; Bullard, Joanna E.; Livingstone, Ian.

    Earth Surface Processes and Landforms. 1995. p. 515-529 (Earth Surface Processes and Landforms; Vol. 20).

    Research output: Contribution to Book/Report typesChapter

    TY - CHAP

    T1 - Dune mobility and vegetation cover in the Southwest Kalahari desert

    AU - Wiggs, Giles F.S.

    AU - Thomas, David S.G.

    AU - Bullard, Joanna E.

    AU - Livingstone, Ian

    PY - 1995

    Y1 - 1995

    N2 - As part of a wider project investigating the palaeoenvironmental significance of partially vegetated linear dunes in the southwest Kalahari, data collected in the latter part of 1992 concerning dune movement and vegetation cover suggest that sediment transport is occurring on some dune surfaces, and that the majority of surface activity occurs on the crests and upper slopes of the dunes. The data suggest that the limiting variables on surface sediment movement vary on different parts of a dune. On interdunes and lower dune slopes the primary limiting variable is available wind energy, while on dune crests and upper slopes it is vegetation cover. Ground cover by litter has much greater importance in protecting the surface sediment from erosion than rooted vegetation, From individual data points, no evidence is found to support a threshold vegetation cover below which sediment movement occurs, Rather, a gradient of activity is suggested whereby a reduction in vegetation cover increases the potential for sediment movement and surface change. However, dunes with differing amounts of mean vegetation cover display differing degrees of surface activity, and at this scale, a vegetation cover threshold in the region of 14 per cent may be recognized.

    AB - As part of a wider project investigating the palaeoenvironmental significance of partially vegetated linear dunes in the southwest Kalahari, data collected in the latter part of 1992 concerning dune movement and vegetation cover suggest that sediment transport is occurring on some dune surfaces, and that the majority of surface activity occurs on the crests and upper slopes of the dunes. The data suggest that the limiting variables on surface sediment movement vary on different parts of a dune. On interdunes and lower dune slopes the primary limiting variable is available wind energy, while on dune crests and upper slopes it is vegetation cover. Ground cover by litter has much greater importance in protecting the surface sediment from erosion than rooted vegetation, From individual data points, no evidence is found to support a threshold vegetation cover below which sediment movement occurs, Rather, a gradient of activity is suggested whereby a reduction in vegetation cover increases the potential for sediment movement and surface change. However, dunes with differing amounts of mean vegetation cover display differing degrees of surface activity, and at this scale, a vegetation cover threshold in the region of 14 per cent may be recognized.

    KW - Kalahari Desert

    KW - dune movement

    KW - linear dunes

    KW - sediment transport

    KW - vegetation cover

    UR - http://www.mendeley.com/research/dune-mobility-vegetation-cover-southwest-kalahari-desert

    U2 - 10.1002/esp.3290200604

    DO - 10.1002/esp.3290200604

    M3 - Chapter

    SN - 0197-9337

    T3 - Earth Surface Processes and Landforms

    SP - 515

    EP - 529

    BT - Earth Surface Processes and Landforms

    ER -

    Wiggs GFS, Thomas DSG, Bullard JE, Livingstone I. Dune mobility and vegetation cover in the Southwest Kalahari desert. In Earth Surface Processes and Landforms. 1995. p. 515-529. (Earth Surface Processes and Landforms). https://doi.org/10.1002/esp.3290200604