scholarly journals A simple expression for wind erosion threshold friction velocity

2000 ◽  
Vol 105 (D17) ◽  
pp. 22437-22443 ◽  
Author(s):  
Yaping Shao ◽  
Hua Lu
Keyword(s):  
Wind Erosion ◽  
Friction Velocity ◽  
Simple Expression ◽  
Threshold Friction Velocity ◽  
Erosion Threshold

Optimal feature selection for prediction of wind erosion threshold friction velocity using a modified evolution algorithm

Geoderma ◽  
2019 ◽  
Vol 354 ◽  
pp. 113873 ◽  
Author(s):  
I. Kouchami-Sardoo ◽  
H. Shirani ◽  
I. Esfandiarpour-Boroujeni ◽  
J. Álvaro-Fuentes ◽  
H. Shekofteh
Keyword(s):  
Feature Selection ◽  
Wind Erosion ◽  
Friction Velocity ◽  
Threshold Friction Velocity ◽  
Erosion Threshold ◽  
Optimal Feature Selection ◽  
Evolution Algorithm ◽  
Selection For ◽  
Optimal Feature

scholarly journals A simple method to estimate threshold friction velocity of wind erosion in the field

2010 ◽  
Vol 37 (10) ◽  
pp. n/a-n/a ◽  
Author(s):  
Junran Li ◽  
Gregory S. Okin ◽  
Jeffrey E. Herrick ◽  
Jayne Belnap ◽  
Seth M. Munson ◽  
...  
Keyword(s):  
Wind Erosion ◽  
Friction Velocity ◽  
Simple Method ◽  
Threshold Friction Velocity

scholarly journals Szélerózió okozta talaj-, humusz- és tápanyag-áthalmozás különbségeinek feltárása különböző szerkezeti adottságú csernozjom talajokon terepi szélcsatorna kísérletek alapján

2021 ◽  
Author(s):  
Farsang Andrea ◽  
Barta Károly ◽  
Szatmári József ◽  
Bartus Máté
Keyword(s):  
Wind Erosion ◽  
Friction Velocity ◽  
Humus Content ◽  
Aggregate Size ◽  
List Type ◽  
Chernozem Soil ◽  
Wind Tunnel Experiments ◽  
Threshold Friction Velocity ◽  
Chernozem Soils

Kutatásunk során Magyarország két dél-alföldi réti csernozjom talajú területét vizsgáltuk azon céllal, hogy in situ körülmények között számszerűsítsük a különböző szélesemények által okozott talajveszteség mértékét, az ezzel együtt járó humusz- és tápanyagáthalmozás nagyságrendjét, valamint a két terület defláció érzékenységében tapasztalt különbségek okait.Vizsgálati területeink Békés megyében, Makótól K-re mintegy 10 km-re, Apátfalva külterületén, valamint Csongrád megyében Szegedtől ÉNy-ra 2 km-re helyezkedtek el. Kutatásunk célkitűzései az alábbiak voltak: terepi szélcsatornás mérésekre alapozott laboratóriumi mérések alapján különböző szerkezeti állapotú csernozjom talajokra meghatározni◾az indítósebességet,◾a szélerózióval áthalmozott szedimentben mért makroelem, és humuszanyag feldúsulását,◾valamint az ezekre ható talajtani tényezőket.A hasonló mechanikai összetételű, Szeged és Apátfalva melletti réti csernozjom talajok aggregátum összetételében, valamint a CaCO3 és humusztartalomban megfigyelhető különbségek hatására a Szeged melletti csernozjom mintaterület talaja defláció érzékenyebb. A Szegedtől É-ra eső csernozjomokon 6,5–9,0 m s–1 közötti indítósebesség értékeket mértünk, míg Apátfalván 13,0 m s–1 volt az indítósebesség értéke. Az apátfalvi terület talajának magasabb karbonát- és humusztartalma, valamint aggregátum összetételében mért magasabb morzsa arány az indítósebességérték növelésének irányába hat. A feltalajban a 0,5 mm-nél kisebb aggregátumok magasabb aránya következtében nemcsak kisebb indítósebesség értékeket, hanem nagyobb áthalmozódó talajmennyiséget, valamint ezzel együtt nagyobb mennyiségű humusz- és foszfor elmozdulást mértünk az egységesen 10-10 perces fújatási kísérleteink alkalmával a szegedi mintaterületen. Megállapítható tehát, hogy egyazon talajtípusba eső, s azonos textúrájú (homokos vályog) talajok esetében az aggregátum összetételben, valamint a CaCO3 és humusztartalomban megfigyelhető eltérések hatására jelentős különbségek tapasztalhatók a defláció érzékenység, az indítósebesség, a szediment szállítás módja és a humusz- és elemáthalmozás mértéke között.In our research, two Chernozem soil areas were examined in the southern part of the Great Hungarian Plain in order to quantify the amount of the soil loss, humus and nutrient transport caused by different wind events and in order to show the causes of the differences in the sensitivity of deflation between the two areas.Our study areas were located in Békés County, one of them was near Apátfalva, about 10 km east of Makó, and the other one was 2 km northeast of Szeged in Csongrád County. Our in situ wind tunnel experiments were accomplished on 2–4 June 2011 at Apátfalva and in July 2013 in Szeged. The objectives of our research were the followings:◾determination of the enrichment ratios for humus, macro- and microelements in the wind eroded sediments in the case of Chernozem soils with different structures based on field experiments and laboratory measurements;◾determination the affecting actual soil factors;◾estimation of soil loss and element rearrangement trends on Chernozem arable lands under different wind velocity on plot scale.Because of the differences in the aggregate size distribution, CaCO3 and humus content, Chernozem soil near Szeged is more sensitive to deflation than near Apátfalva. Threshold friction velocity was measured between 6.5 and 9.0 m s–1 near Szeged, while the same parameter was 13.0 m s–1 at Apátfalva. The higher carbonate and humus content and the higher crumb ratio of the soil on the Apátfalva area result increasing threshold friction velocity. Due to the higher proportion of aggregates smaller than 0.5 mm in the topsoil, we have measured not only lower threshold friction velocities, but also a larger quantity of transported soil and a larger humus and phosphorus loss during the uniform 10-10 minute long wind tunnel experiments in the Szeged sample area. It can be concluded that even in spite of the same soil type and same texture there are significant differences between deflation sensitivity, threshold friction velocity, sediment transport mode, humus and nutrient transportation because of the significant differences in aggregate size distribution, CaCO3 and humus content.It means that the agronomic structure of the soils greatly influences the mitigation and aggravation of the soil the stress effects caused by climate change. Extreme weather situations have drawn attention to the fact that improperly applied cultivation methods, tools, and overuse of Chernozem soils can modify the soil structure. One of the most serious affect is the dusting of the surface layer of the soil. During this process the larger macroaggregates disintegrate into microaggregates and the resulting smaller fractions are more exposed to wind erosion.The dust load affecting our settlements is mainly originated from arable lands. The mitigation of this emission is fundamentally based on the regulation of land use, farming practices and deflation. “Best Management Practices” (BMPs) mean a group of selected tools that can reduce or eliminate the transport of pollutants from diffuse sources before, during and/or after agricultural activities. However, these diffuse agricultural loads caused by wind erosion can only be quantified if the magnitude and spatial movement of the dust and pollutants is monitored.

On the effect of moisture bonding forces in air-dry soils on threshold friction velocity of wind erosion

Sedimentology ◽  
2006 ◽  
Vol 53 (3) ◽  
pp. 597-609 ◽  
Author(s):  
SUJITH RAVI ◽  
TED M. ZOBECK ◽  
THOMAS M. OVER ◽  
GREGORY S. OKIN ◽  
PAOLO D'ODORICO
Keyword(s):  
Wind Erosion ◽  
Friction Velocity ◽  
Threshold Friction Velocity ◽  
Effect Of Moisture

scholarly journals On the prediction of threshold friction velocity of wind erosion using soil reflectance spectroscopy

2015 ◽  
Vol 19 ◽  
pp. 129-136 ◽  
Author(s):  
Junran Li ◽  
Cody Flagg ◽  
Gregory S. Okin ◽  
Thomas H. Painter ◽  
Kebonye Dintwe ◽  
...  
Keyword(s):  
Wind Erosion ◽  
Friction Velocity ◽  
Reflectance Spectroscopy ◽  
Threshold Friction Velocity ◽  
Soil Reflectance

scholarly journals The Impacts of Climate Variability on the Wind Erosion Potentials in the Western Region of Makran Coastal Plain, Iran

2021 ◽  
Author(s):  
Mohammad Akbarian ◽  
Asadollah Khoorani
Keyword(s):  
Coastal Plain ◽  
Wind Erosion ◽  
Climatic Factors ◽  
Kendall Test ◽  
Early Summer ◽  
Western Region ◽  
Threshold Velocity ◽  
Winter Solstice ◽  
Erosion Threshold ◽  
The Western Region

Abstract Coastal plains are prone to various degrees of wind erosion due to their characteristics. This study aimed to investigate the effect of climatic factors in the western region of Makran coastal plain in a southeastern region of Iran on the wind erosion potential. The study period was 1993-2018. First, the data related to wind velocities, relative humidity and precipitation, and the granulometric data of plain surface sediments were obtained. Then, the wind erosion threshold velocity in humid air conditions was determined. Finally, the Mann-Kendall test was applied to analyze the probability of wind erosion and its temporal variability. The results indicated that the wind erosion threshold, in terms of humidity changes, varied from 7.21 to 12.31 meters per second during the study period. The highest probability of wind erosion was in February, March, and April, with 24.69%, 21.51%, and 20.41%, respectively. The lowest probability of wind erosion was in October, November, and September with 4.00%, 4.12%, and 6.00%, respectively. Finally, the erosion trend analysis indicated that wind erosion was a temporal phenomenon that increased significantly in January (winter solstice) and July (summer solstice). These months were characterized by an increase in the wind blowing at speed above the threshold. Otherwise, the months were not different from other months of the year in terms of precipitation or the number of dry days. Therefore, wind erosion is expected to maximize in the early winter and the early summer.

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