Aeolian processes and sand encroachment problems in Kuwait

Khalaf, Fikry I.; Al‐Ajmi, D.

doi:10.1016/0169-555x(93)90042-z

Cited by 91 publications

(51 citation statements)

References 4 publications

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“…Some of these eight SDS trajectories were also identified by other investigators [23][24][25][26][27]. Major SDS trajectories are initiated in southern Iraq [25].…”

Section: Hurmuz (Hrz)mentioning

confidence: 72%

Types, Indications and Impact Evaluation of Sand and Dust Storms Trajectories in the Arabian Gulf

2017

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Dust is a common weather phenomenon in the Arabian Gulf, which has severely affected economy and health. Sand and dust storms (SDS) trajectories in the Arabian Gulf were temporally and spatially monitored from March 2000 to March 2017. Eight major SDS trajectories were detected from satellite images. The dust storms trajectories were categorized according to shape and size into three main types with 12 subtypes in the region. The annual transported dust amount into the Arabian Gulf was estimated by 89.1 million metric tons, which is about 10,330 metric tons per cubic kilometer of water volume. In comparison to other seas and oceans, the amount of dust deposited into the Arabian Gulf water body volume is the highest. Dust deposited in the coastal regions within the Arabian Gulf are originated from Mesopotamian Flood Plain (MFP), Ahwaz (HZ), Ahwar (HR) and Baluchistan Desert (BSH) and characterized by physical parameters and composition. Such physical characterization of the trajectories of SDS, and of the properties of particles transported in the Arabian Gulf can be helpful to assess and mitigate the environmental impact of future similar events.

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“…Some of these eight SDS trajectories were also identified by other investigators [23][24][25][26][27]. Major SDS trajectories are initiated in southern Iraq [25].…”

Section: Hurmuz (Hrz)mentioning

confidence: 72%

Types, Indications and Impact Evaluation of Sand and Dust Storms Trajectories in the Arabian Gulf

2017

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“…There are a few reports of a similar formation to this type from the field. Khalaf and Al-Ajmi (1993) observed a small flat sand-patch grow to a barchan in a newly forming dune field in Kuwait. Andreotti et al (2002a) mentioned a flat sand-patch in a barchan-like plan shape upwind of an eolian barchan field in southern Morocco and interpreted it as a precursor to a barchan.…”

Section: Process Of Formationmentioning

confidence: 95%

Barchan ripples under unidirectional water flows in the laboratory: formation and planar morphology

Endo

Sunamura

Takimoto

2005

Earth Surf Processes Landf

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The purpose of the present study is to investigate the formation and planar shape of barchan ripples generated by laboratory unidirectional water currents and to compare the morphology with that of barchans formed by laboratory waves and flows in natural environments. A thin veneer of sand as a sediment source was placed initially at the upstream part of a recirculating flume and the change in bed configurations by the flow was recorded by a video camera. Two types of formative process were observed: one was that barchan ripples grew from barchanoid bedforms and the other was that they developed from a small aggregate of sand particles. The barchan ripples in the present test had the same characteristics in the height-width relation and in the migration speed as previously reported from the desert environment and wave-flume studies. An examination of the planar shape of the barchans led to the result that the barchan ripples had larger values of body-length/width, compared with those of barchans formed by water waves in the laboratory and by airflow in natural deserts. The horn-length/width of the barchan ripples was smaller than that of barchan dunes in deserts but larger than that of barchans in oscillatory laboratory flows. Copyright

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“…Fryberger, 1979;Wasson and Hyde, 1983;Summerfield, 1991). Sizes and/or shapes of natural barchan dunes have been investigated in various places, such as southern Peru (Finkel, 1959;Hastenrath, 1967;Gay, 1999), California (Long and Sharp, 1964;Norris, 1966), Kuwait (Khalaf and Al-Ajmi, 1993), Namibia (Hesp and Hastings, 1998) and Morocco (Sauermann et al, 2000). Scale invariance (e.g.…”

Section: Introductionmentioning

confidence: 99%

Barchan‐shaped ripple marks in a wave flume

Endo

Kubo

Sunamura

2004

Earth Surf Processes Landf

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Barchans, isolated crescent-shaped bedforms, are believed to be formed under almost unidirectional wind or water flows and limited sand supply. The formation of barchan morphologies under the action of purely oscillatory wave motion has not yet been fully investigated. The present study attempted to form barchan topography in a wave flume and to compare this with barchans in the field. Barchan morphologies of ripple size, called the barchan ripples, were generated from a flat bed by the action of waves. The horn width, the distance between horn tips, of the barchan ripples increased linearly with an increase in the total length, the overall length projected on the centre line of the barchan, with a coefficient common to barchan dunes in deserts. The ratio of horn length to horn width of the barchan ripples was smaller than that of barchan dunes, but similar to that of subaqueous barchans in the field. The longer the wave period was, the larger the ratio of the body length to horn width became. Most subaqueous barchans formed under waves (in the laboratory) and unidirectional flows (in the field) had blunter horns than subaerial barchans. The shape of the barchan ripples changed with wave period. The outer rim became rounder with increasing wave period. The relationship between the base area and the height of barchan morphologies seems to be linear, with a constant coefficient for the scale from ripples to dunes. The barchan ripples showed a linear relationship between the height and the horn width, similar to that for barchan dunes. The migration speed of the barchan ripples was proportional to the cube of the flow velocity and was inversely proportional to height. The same relation with a different value of the coefficient was obtained for barchan dunes.

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Aeolian processes and sand encroachment problems in Kuwait

Cited by 91 publications

References 4 publications

Types, Indications and Impact Evaluation of Sand and Dust Storms Trajectories in the Arabian Gulf

Types, Indications and Impact Evaluation of Sand and Dust Storms Trajectories in the Arabian Gulf

Barchan ripples under unidirectional water flows in the laboratory: formation and planar morphology

Barchan‐shaped ripple marks in a wave flume

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