Scale model simulations of the deposition of loess in Hilly Terrain

Goossens, Dirk

doi:10.1002/esp.3290130607

Cited by 28 publications

(18 citation statements)

References 16 publications

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“…The thickness of the loess layer is highly variable, from absent on some local hilltops to several meters. Goossens (1987Goossens ( , 1988 demonstrated the influence of aspect on the thickness of these wind-blown deposits. He found a thicker loess layer on north to east oriented slopes compared with the south to west oriented slopes, due to the prevailing wind direction at the time of deposition.…”

Section: Study Areamentioning

confidence: 98%

Spatial variability of soil horizon depth in natural loess-derived soils

et al. 2010

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Section: Study Areamentioning

confidence: 98%

Spatial variability of soil horizon depth in natural loess-derived soils

et al. 2010

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“…The effect of topography on aeolian dust deposition has been investigated in detail in wind tunnels (Goossens, 1988a(Goossens, , 1988b(Goossens, , 1989(Goossens, , 1996a(Goossens, , 1997Goossens and Offer, 1990;Offer and Goossens, 1995) and in field experiments (Goossens, 1988c;Offer, 1990, 1993;Offer and Goossens, 1995). The effect of topography on aeolian dust erosion has also been investigated (Offer and Goossens, 1994;Goossens and Offer, 1997).…”

Section: Introductionmentioning

confidence: 98%

Dry aeolian dust accumulation in rocky deserts: �a medium-term field experiment based on short-term wind tunnel simulations

Goossens

2000

Earth Surf. Process. Landforms

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The spatial pattern of medium-term (a few months) dry aeolian dust accumulation in rocky deserts is predicted using shortterm deposition and erosion experiments in a wind tunnel. The predictions are tested in a field experiment set up in the northern Negev Desert of Israel. The results show that superimposing wind tunnel deposition and erosion maps usually leads to correct predictions of medium-term dust accumulation. The predictions are somewhat less confident near the inflection lines of windward hillslopes, where small-scale irregularities in the local topography make it difficult to locate the exact position of the areas of little accumulation. Elsewhere in the topography predictions are good, and the method works satisfactorily.Highest accumulation occurs on concave windward slopes and, to a lesser extent, on slopes parallel to the wind. Little accumulation occurs on the convex windward slopes and in dust separation bubbles. The smallest accumulation rates are observed immediately upwind of the top of pronounced hills and on leeslopes.The rate of dry dust accumulation measured during the field experiment varied from 17 to 93 g m À2 a À1 , depending on the topographic position of the accumulation plots. For most plots, it was of the order of 30±60 g m À2 a À1 .

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“…Goossens (1988bGoossens ( , 1989Goossens ( , 1996, Offer (1990, 1993), Offer and Goossens (1995), Zufall et al (1999b) and Parker and Kinnersley (2004) studied the effects of topography on aeolian dust deposition. Dijkmans and Törnqvist (1991), Pye (1996), Goossens (1988cGoossens ( , 1997Goossens ( , 2000, Goossens and Offer (in press) and Mason et al (1999) examined the accumulation of dust and dust deposits in complex relief. Several studies focusing on the interaction between topographic obstacles (including landforms) and blowing snow have also appeared in the last few years (e.g.…”

Section: Introductionmentioning

confidence: 99%

Aeolian deposition of dust over hills: the effect of dust grain size on the deposition pattern

Goossens

2005

Earth Surf Processes Landf

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Wind tunnel experiments were conducted to investigate the effects of topography on the grain size characteristics of aeolian dust deposits. Experiments were performed on three isolated hills having various size and aspect ratios. The longitudinal profile of the median grain diameter was investigated for each hill. The longitudinal dust deposition profile was also studied for nine grain size classes of between 10 and 104 µ µ µ µ µm, as were wind and dust concentration profiles in the atmosphere upwind of, over and downwind of a hill. The wind tunnel experiments show that the grain size characteristics of aeolian dust deposits are affected by topography. Most apparent is the occurrence of a zone of reduced grain size on the leeside of hills, which extends from just upwind of the summit to a distance of several times the height of the hill. Slightly coarser than normal dust is deposited on the concave windward hill slope and in a zone downwind of the area of reduced grain size, but the increase in grain size in these zones remains very small. Although the normalized dust deposition profile for a hill does not vary substantially as a function of grain size, systematic trends are observed. The most important tendencies are: (1) a progressive extension, in the downwind direction, of a zone of decreased dust deposition on the leeside of a hill (the coarser the grains, the further downwind the zone of reduced deposition extends); (2) a progressive increase in dust deposition immediately upwind of a hill (the finer the grains, the higher the deposition value upwind of a hill becomes). Both tendencies are explained by the difference in inertia of the grains, which is controlled by grain size.

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Scale model simulations of the deposition of loess in Hilly Terrain

Cited by 28 publications

References 16 publications

Spatial variability of soil horizon depth in natural loess-derived soils

Spatial variability of soil horizon depth in natural loess-derived soils

Dry aeolian dust accumulation in rocky deserts: �a medium-term field experiment based on short-term wind tunnel simulations

Aeolian deposition of dust over hills: the effect of dust grain size on the deposition pattern

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