Wind tunnel evaluation of a wedge-shaped aeolian sediment trap
Aeolian features ; Aeolian transport ; Dust ; Eolian deflation ; Experimentation ; Research technique ; Sand ; Wind erosion
A detailed set of tests in a wind tunnel investigated the characteristics of flow and sampling efficiency of a low cost sediment trap that can be used in wind tunnels and field applications. Results indicate that this trap, and others that have wide
side profiles, are very sensitive to incident wind angle.
Spatial coherence and decay of wind speed and power in the north-central United States
Annual variation ; Climatology ; Interannual variability ; Methodology ; Spatial analysis ; Spatial autocorrelation ; United States of America ; Wind ; Wind speed
Hourly wind data from a network of climate stations in the north-central United States (drawn from the states of Illinois, Iowa, Kansas, Minnesota, Missouri, Nebraska, North Dakota, South Dakota, and Wisconsin) are analyzed to evaluate the efficacy
of spatial analyses of near-surface wind speed and power. Spatial autocorrelation functions calculated at a number of timescales : annual, monthly, daily, hourly, and mean absolute differences are used to characterize the spatial coherence and decay of wind
speed and power. Methods for improving the spatial analysis of wind also are discussed.
Aeolian features ; Arid area ; Model ; Nevada ; Roughness ; Shear stress ; United States of America ; Vegetation ; Wind erosion ; Wind speed
The purpose of this investigation is to provide direct measurements of wind force components over surfaces of various roughnesses in the field in order to assess the protective role of sparse vegetation and to evaluate the shear stress partitioning
model of Raupach et al. (1993) over a range of wind speeds. As well, this study will provide a data set for comparison with other field and wind tunnel studies.
Wind erosion of Mancos Shale badland ridges by sudden drops in pressure
Arid area ; Atmospheric pressure ; Badland ; Micromorphology ; Soil ; Soil properties ; United States of America ; Utah ; Wind ; Wind erosion
One process of erosion of Mancos Shale badlands near Hanksville, Utah, appears to be caused by nearly instantaneous drops in air pressure accompanying gusts of wind. A series of sharp-crested bedrock ridges trend nearly perpendicular to the strong
, gusty southwesterly winds that precede cold fronts passing through the area. Soil susceptible to this type of erosion consist of polygonally cracked surface crust averaging 1.2 cm thick overlying a porous subsoil of silt-sized shale chips. The arid
Alberta ; Annual variation ; Atmospheric circulation ; Canada ; Local wind ; Markov chain ; Mountain ; Probability ; Rocky Mountains ; Wind
The chinook is possibly the best example of warm mesoscale mountain winds that blow in regions where long mountain chains more or less lie at right angles to the prevailing wind. Calgary experiences approximately 50 chinook days between November
Grain-size analysis of surface material under wind erosion using the effective surface concept
Aeolian features ; Aeolian transport ; Concept ; Experimentation ; Grain size distribution ; Methodology ; Roughness ; Wind erosion
This paper deals with the temporal variation in the grain size of surface material using an analytical method based on the effective surface concept. This method is applied to data collected in 2 series of wind tunnel experiments. The results
Aeolian deflation ; Aeolian features ; Agricultural practice ; Agropedology ; Cultivated land ; Experimentation ; Hungary ; Irrigation ; Soil ; Soil erosion ; Soil properties ; Wind
This study gives account of the most important results of 3 series of wind tunnel experiments : deflational losses of 10 different types of dry soil at various wind speeds; resistance to deflation of soils cultivated (rolled) in different ways
; deflation-moderating impact of irrigation varied in extent with 27 different soil samples. The experiments are capable of providing useful data for the initial stage of form development in wind-blown sand areas, as well.
Air temperature ; Climatic variability ; Climatic variation ; Fishing ; Fishing zone ; Greece ; Ocean atmosphere interaction ; Seasonality ; Spectral analysis ; Statistics ; Surface temperature ; Temperature ; Wind ; Wind speed
as different climatic parameters in Hellenic waters (air and sea surface temperature, sea level pressure, N-S wind component and wind speed cubed) over the 1964 to 1989 period were analyzed using spectral and cross-spectral analyses. Discussion of the results.
Atmosphere ; Atmospheric moisture ; Geophysics ; Human impact ; Snow ; Temperature ; Volcanism ; Water vapor ; Wind speed
Sound travels faster at higher temperatures and relative humidities. It can be heard at a greater distance with a temperature inversion or when the wind direction is toward the listener. Snow and water vapor absorb sound and thus decrease
The AA. will first present the annual rainfall cycle in Kenya and the diurnal regimes along the coast. The seasonal and diurnal wind circulation patterns will be next examined. The study of individual rainy events and their relationship
with the wind anomalies will enable to determine the relative importance of atmospheric circulation patterns of different scales (breezes, monsoons and their interactions).
Aeolian features ; Aeolian transport ; Beach ; Coastal environment ; Eolian deflation ; Evaporation ; New Jersey ; Sand ; Soil moisture ; United States of America ; Wind speed
In this paper, the AA. examine sediment transport rates related to changing moisture content during relatively low wind speeds, using data gathered at Wildwood, New Jersey.