Articles de revues : « Windblown sand »

1

Bo, Tian-Li, Zheng Li et Xiao-Jing Zheng. « Sand particle dislodgement in windblown sand ». Acta Mechanica Sinica 30, n^o 6 (décembre 2014) : 910–16. http://dx.doi.org/10.1007/s10409-014-0099-5.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

2

Huang, Bin, Zhengnong Li, Zhitian Zhang, Zhefei Zhao et Bo Gong. « Wind Tunnel Test on Windblown Sand Two-Phase Flow Characteristics in Arid Desert Regions ». Applied Sciences 11, n^o 23 (30 novembre 2021) : 11349. http://dx.doi.org/10.3390/app112311349.

Texte intégral

Résumé :

Windblown sand two-phase flow characteristics become an essential factor in evaluating the windblown sand load on infrastructures and civil structures. Based on the measured wind characteristics in arid desert regions, windblown sand flow fields with three kinds of sand beds are simulated in the wind tunnel, respectively. The results indicate that the characteristic saltation height of sand particles increases with the wind speed and particle size in the windblown sand flow field. As the sand concentration increases, the wind speed decreases, and the turbulence intensity increases. The concentration, energy, and impact pressure of sand particles increase with increasing wind speed and decrease exponentially with increasing height. At the same wind speed, the concentration, energy, and impact pressure of the coarse sand, fine sand, and mixed sand increases, in turn. Moreover, the variation of kinetic energy with height is similar to that of total energy with height and the proportion of potential energy to total energy is quite small.

Styles APA, Harvard, Vancouver, ISO, etc.

3

Kurtze, Douglas A., Joseph A. Both et Daniel C. Hong. « Surface instability in windblown sand ». Physical Review E 61, n^o 6 (1 juin 2000) : 6750–58. http://dx.doi.org/10.1103/physreve.61.6750.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

4

Zhao, Yuxi, Rongcheng Liu, Fan Yan, Dawei Zhang et Junjin Liu. « Windblown Sand-Induced Degradation of Glass Panels in Curtain Walls ». Materials 14, n^o 3 (28 janvier 2021) : 607. http://dx.doi.org/10.3390/ma14030607.

Texte intégral

Résumé :

The windblown sand-induced degradation of glass panels influences the serviceability and safety of these panels. In this study, the degradation of glass panels subject to windblown sand with different impact velocities and impact angles was studied based on a sandblasting test simulating a sandstorm. After the glass panels were degraded by windblown sand, the surface morphology of the damaged glass panels was observed using scanning electron microscopy, and three damage modes were found: a cutting mode, smash mode, and plastic deformation mode. The mass loss, visible light transmittance, and effective area ratio values of the glass samples were then measured to evaluate the effects of the windblown sand on the panels. The results indicate that, at high abrasive feed rates, the relative mass loss of the glass samples decreases initially and then remains steady with increases in impact time, whereas it increases first and then decreases with an increase in impact angle such as that for ductile materials. Both visible light transmittance and effective area ratio decrease with increases in the impact time and velocities. There exists a positive linear relationship between the visible light transmittance and effective area ratio.

Styles APA, Harvard, Vancouver, ISO, etc.

5

Bruno, Luca, Nicolas Coste, Davide Fransos, Andrea Lo Giudice, Luigi Preziosi et Lorenzo Raffaele. « Shield for Sand : An Innovative Barrier for Windblown Sand Mitigation ». Recent Patents on Engineering 12, n^o 3 (22 octobre 2018) : 237–46. http://dx.doi.org/10.2174/1872212112666180309151818.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

6

Liu, Yakui, Li Xie, Qiang Ma, Junjie Li et Jùn Zhou. « Charges of individual sand grains in natural windblown sand fluxes ». Aeolian Research 53 (septembre 2021) : 100743. http://dx.doi.org/10.1016/j.aeolia.2021.100743.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

7

Bo, Tian-Li, Huan Zhang, Wen-Wen Hu et Xiao-Jing Zheng. « The analysis of electrification in windblown sand ». Aeolian Research 11 (décembre 2013) : 15–21. http://dx.doi.org/10.1016/j.aeolia.2013.07.004.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

8

Tresca, Antoine, Marie-Hélène Ruz, Stéphane Raison et Pascal Grégoire. « MANAGEMENT OF AEOLIAN SAND TRANSPORT ON A DIKE, DUNKIRK SEAPORT, FRANCE ». Coastal Engineering Proceedings 1, n^o 33 (25 octobre 2012) : 91. http://dx.doi.org/10.9753/icce.v33.sediment.91.

Texte intégral

Résumé :

The shoreline of Dunkirk Seaport partly consists of a macrotidal beach oriented WSW-ENE backed by a 6 km long coated dike called “digue du Braek”. Aeolian sand transport was estimated on asphalt by means of sand traps. Also, time-averaged wind speed profiles were measured using cup anemometers under various wind velocities and directions along a transversal profile on the dike and the upper beach. High rates of sand transport enabled the setup of different kinds of experimental windbreaks on asphalt, in order to test potential dune formation on this kind of substrate. Under oblique onshore winds, it was regularly observed that amounts of sand captured in the traps placed on the dike were more important than those in traps placed on the upper beach. These results were related to sand sources: windblown sand captured on the dike originated from the coastal dunes developed at the dike toe, while sand trapped on the upper beach came from the tidal zone were aeolian transport is limited by complex intertidal bar-trough topography. It also appeared from the topographic surveys carried out on the windbreaks that although their location seemed to play a major role on the amount of sand captured, fences and synthetic fabrics deployed on sandy surfaces were also able to trap windblown sand on the seaport dike.

Styles APA, Harvard, Vancouver, ISO, etc.

9

Zhang, Shuai, Guo-dong Ding, Ming-han Yu, Guang-lei Gao, Yuan-yuan Zhao, Guo-hong Wu et Long Wang. « Effect of Straw Checkerboards on Wind Proofing, Sand Fixation, and Ecological Restoration in Shifting Sandy Land ». International Journal of Environmental Research and Public Health 15, n^o 10 (6 octobre 2018) : 2184. http://dx.doi.org/10.3390/ijerph15102184.

Texte intégral

Résumé :

Due to their simple layout and adaptability to various environments, straw checkerboards are widely used to control windblown sand in China. To fully understand the wind proofing and sand-fixing benefits of different board specifications, and to determine the restorative effects of straw checkerboard, we tested different sizes of checkerboard, determined their performance as a windbreak and in trapping shifting sand, and constructed models based on wind tunnel tests, enabling the wind speed flow field to be analysed. We also sampled the soil in areas where straw checkerboards had been established for several years and analysed the trends in soil physical and chemical properties over time. We found that all sizes of straw checkerboard effectively reduced the wind speed near the surface and formed a protected area, with the best protective effect achieved for a one-meter board. All sizes of straw checkerboard effectively intercepted windblown sand to form surface accumulation, with the one-meter board again showing the best performance. The use of a straw checkerboard also effectively improved the physical and chemical properties of soil and promoted ecological restoration. These results indicate that straw checkerboards are a low-cost engineering measure that could play an important role in desertification control and the ecological restoration of sandy land ecosystems.

Styles APA, Harvard, Vancouver, ISO, etc.

10

Michels, Karlheinz, Dean V. Armbrust, Bruce E. Allison et Mannava V. K. Sivakumar. « Wind and Windblown Sand Damage to Pearl Millet ». Agronomy Journal 87, n^o 4 (juillet 1995) : 620–26. http://dx.doi.org/10.2134/agronj1995.00021962008700040003x.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

11

Yokota, Takuya, Akio Kobayashi, Takaaki Uda, Masumi Serizawa, Yasuhito Noshi et Atsunari Katsuki. « MODEL FOR PREDICTING 3-D BEACH CHANGES UNDER COMPOUND ACTIONS OF WAVES AND WIND ». Coastal Engineering Proceedings, n^o 36v (31 décembre 2020) : 49. http://dx.doi.org/10.9753/icce.v36v.papers.49.

Texte intégral

Résumé :

A model for predicting 3-D beach changes in an extensive area including beach and backshore areas was developed, taking the effects due to both waves and windblown sand into account. In the calculation of beach changes, the BG model (a model for predicting beach changes based on Bagnold's concept) was employed, and a cellular automaton method was used to calculate the backshore changes due to the effect of windblown sand. To validate the model applicability, a reproduction calculation was carried out for the beach formed at the corner of Futtsu new port. The calculation results were in good agreement with the measurement results.Recorded Presentation from the vICCE (YouTube Link): https://youtu.be/905aRlNAOjA

Styles APA, Harvard, Vancouver, ISO, etc.

12

Raffaele, Lorenzo, et Luca Bruno. « Windblown Sand Mitigation Along Railway Megaprojects : A Comparative Study ». Structural Engineering International 30, n^o 3 (3 mars 2020) : 355–64. http://dx.doi.org/10.1080/10168664.2020.1714530.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

13

Wang, Cui, Shengyu Li, Zhinong Li, Jiaqiang Lei et Jie Chen. « Effects of windblown sand damage on desert highway guardrails ». Natural Hazards 103, n^o 1 (16 mai 2020) : 283–98. http://dx.doi.org/10.1007/s11069-020-03987-w.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

14

Williams, Steven H., et Ronald Greeley. « Windblown sand on Venus : The effect of high atmospheric density ». Geophysical Research Letters 21, n^o 25 (15 décembre 1994) : 2825–28. http://dx.doi.org/10.1029/94gl02762.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

15

Berkowitz, Rachel. « Size-sorted sand creates uncommon length scale in windblown formations ». Physics Today 71, n^o 7 (juillet 2018) : 18–20. http://dx.doi.org/10.1063/pt.3.3965.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

16

Zhang, Chun-Lai, Xue-Yong Zou, Hong Cheng, Shuo Yang, Xing-Hui Pan, Yu-Zhang Liu et Guang-Rong Dong. « Engineering measures to control windblown sand in Shiquanhe Town, Tibet ». Journal of Wind Engineering and Industrial Aerodynamics 95, n^o 1 (janvier 2007) : 53–70. http://dx.doi.org/10.1016/j.jweia.2006.05.006.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

17

Raffaele, Lorenzo, Luca Bruno, Davide Fransos et Franco Pellerey. « Incoming windblown sand drift to civil infrastructures : A probabilistic evaluation ». Journal of Wind Engineering and Industrial Aerodynamics 166 (juillet 2017) : 37–47. http://dx.doi.org/10.1016/j.jweia.2017.04.004.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

18

Raffaele, Lorenzo, et Luca Bruno. « Windblown sand action on civil structures : Definition and probabilistic modelling ». Engineering Structures 178 (janvier 2019) : 88–101. http://dx.doi.org/10.1016/j.engstruct.2018.10.017.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

19

Wu, Jian-Jun, Sheng-Hu Luo et Li-Hong He. « The characteristic of streamwise mass flux of windblown sand movement ». Geomorphology 139-140 (février 2012) : 188–94. http://dx.doi.org/10.1016/j.geomorph.2011.10.017.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

20

Kang, LiQiang, LieJin Guo et DaYou Liu. « Experimental investigation of particle velocity distributions in windblown sand movement ». Science in China Series G : Physics, Mechanics and Astronomy 51, n^o 8 (17 juillet 2008) : 986–1000. http://dx.doi.org/10.1007/s11433-008-0120-8.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

21

Duan, Shao Zhen, Wei Zhu et Xiao Jing Zheng. « Numerical investigation on two-grain-bed collisions in windblown sand transport ». Powder Technology 235 (février 2013) : 431–36. http://dx.doi.org/10.1016/j.powtec.2012.10.059.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

22

Raffaele, Lorenzo, Luca Bruno, Franco Pellerey et Luigi Preziosi. « Windblown sand saltation : A statistical approach to fluid threshold shear velocity ». Aeolian Research 23 (décembre 2016) : 79–91. http://dx.doi.org/10.1016/j.aeolia.2016.10.002.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

23

Zhang, K., J. Qu, Q. Han, S. Xie, K. Kai, Q. Niu et Z. An. « WIND TUNNEL SIMULATION OF WINDBLOWN SAND ALONG CHINA'S QINGHAI-TIBET RAILWAY ». Land Degradation & ; Development 25, n^o 3 (24 janvier 2012) : 244–50. http://dx.doi.org/10.1002/ldr.2137.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

24

Putten, W. H. Van der, et S. R. Troelstra. « Harmful soil organisms in coastal foredunes involved in degeneration of Ammophila arenaria and Calammophila baltica ». Canadian Journal of Botany 68, n^o 7 (1 juillet 1990) : 1560–68. http://dx.doi.org/10.1139/b90-200.

Texte intégral

Résumé :

The presence of harmful soil organisms in the root zone of Ammophila arenaria (marram grass) was examined by biotesting. For this investigation three locations along the sandy shoreline of The Netherlands were chosen: Voorne, Texel, and Schouwen. At all three locations harmful organisms were detected in sand from stable dunes, as well as in sand from mobile dunes (degenerated and vigorous A. arenaria, respectively). In beach sand, however, no harmful organisms occurred. Since A. arenaria shows vigorous growth only when it is buried regularly by windblown sand from the beach, it is concluded that this sand deposition enables the plants to escape from harmful soil organisms. Ammophila arenaria and Calammophila baltica (purple or hybrid marram grass) from the Voorne location were grown outdoors in containers filled with sand from the beach, the mobile dunes, and the stable dunes, and sterilized sand from the stable dunes. Biomass production of both species was highest in sterilized sand from the stable dune, followed by (in descending order) beach sand, sand from the mobile dune, and unsterilized sand from the stable dune. As compared with A. arenaria, however, growth of C. baltica was reduced less and without mortality of cuttings. Degree of growth reduction by harmful soil organisms could not be related to numbers of plant parasitic nematodes. Key words: Ammophila arenaria, Calammophila baltica, coastal sand dunes, succession, harmful soil organisms.

Styles APA, Harvard, Vancouver, ISO, etc.

25

Ballantyne, Colin K., et Graeme Whittington. « Niveo-aeolian sand deposits on An Teallach, Wester Ross, Scotland ». Transactions of the Royal Society of Edinburgh : Earth Sciences 78, n^o 1 (1987) : 51–63. http://dx.doi.org/10.1017/s0263593300010956.

Texte intégral

Résumé :

ABSTRACTDeposits of windblown sand up to 4 m thick on the Torridon Sandstone massif of An Teallach are shown to be of predominantly niveo-aeolian origin, a form of sedimentation hitherto unrecognised in upland Britain. Sand grains weathered from bedrock and from exposed clasts on plateau areas are blown on to the winter snowpack on surrounding slopes. When the snow melts, the grains are lowered on to the underlying vegetation, which traps the sand and thus allows a stable deposit to accumulate. The deposits formed in this way are massive, poorly sorted and coarser than most aeolian deposits, comprising mainly medium sand (212–600μm) with a substantial proportion of coarse sand and even very small pebbles. The coarseness and poor sorting of the sands reflect the size of grains available for transportation, the strength of the wind, short transport distances and admixture of different grades of sand during deposition. Sand accumulation began in the Early Flandrian before c. 7900 BP, but was eventually much reduced by the establishment of vegetation cover over the plateau source area. Recent disruption of this vegetation cover triggered either by increased storminess or overgrazing resulted in extensive erosion of sand deposits on the plateau and their redeposition on surrounding slopes. Niveo-aeolian deposition continues on lee slopes at present, but is offset by erosion of unvegetated scarps at the margins of the deposits.

Styles APA, Harvard, Vancouver, ISO, etc.

26

YOKOTA, Takuya, Akio KOBAYASHI, Takaaki UDA, Yukiyoshi HOSHIGAMI et Yasuhito NOSHI. « PREDICTION OF TOPOGRAPHIC CHANGES ON INAGE COAST CONSIDERING EFFECT OF WINDBLOWN SAND ». Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering) 77, n^o 2 (2021) : I_325—I_330. http://dx.doi.org/10.2208/jscejoe.77.2_i_325.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

27

Bruno, Luca, Davide Fransos et Andrea Lo Giudice. « Solid barriers for windblown sand mitigation : Aerodynamic behavior and conceptual design guidelines ». Journal of Wind Engineering and Industrial Aerodynamics 173 (février 2018) : 79–90. http://dx.doi.org/10.1016/j.jweia.2017.12.005.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

28

Bruno, Luca, Marko Horvat et Lorenzo Raffaele. « Windblown sand along railway infrastructures : A review of challenges and mitigation measures ». Journal of Wind Engineering and Industrial Aerodynamics 177 (juin 2018) : 340–65. http://dx.doi.org/10.1016/j.jweia.2018.04.021.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

29

Horvat, Marko, Luca Bruno, Sami Khris et Lorenzo Raffaele. « Aerodynamic shape optimization of barriers for windblown sand mitigation using CFD analysis ». Journal of Wind Engineering and Industrial Aerodynamics 197 (février 2020) : 104058. http://dx.doi.org/10.1016/j.jweia.2019.104058.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

30

Ruike, Yang, Han Xiange, Hao Yue et Sun Zhongyu. « Propagation Characteristics of Infrared Pulse Waves through Windblown Sand and Dust Atmosphere ». International Journal of Infrared and Millimeter Waves 28, n^o 2 (24 janvier 2007) : 181–89. http://dx.doi.org/10.1007/s10762-006-9186-4.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

31

Lü, Ping, et Zhibao Dong. « The effects of atmospheric stability intensity on the movement of windblown sand ». Environmental Earth Sciences 61, n^o 4 (3 décembre 2009) : 699–702. http://dx.doi.org/10.1007/s12665-009-0384-y.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

32

Kevey, Balázs, et István Zsolt Tóth. « Égerlápok a Tengelici-homokvidéken (Carici elongatae-Alnetum glutinosae W. Koch 1926) ». Kaposvári Rippl-Rónai Múzeum Közleményei, n^o 4 (2016) : 13–30. http://dx.doi.org/10.26080/krrmkozl.2016.4.13.

Texte intégral

Résumé :

The study containsa phytosociological analysis of alder swamps found in the Tengelic sand Ridge, an expanse of mostly windblown sand in the westernmost part of the Great hungarian Plain, west of the Danube River. These swamps oc-cur in the depressions among sand dunes, where the ground is covered with water for most part of the year. The species composition is characterized by the dominance of alder (Alnus glutinosa) in the forest canopy with the sporadic occurrence of common birch (Betula pendula). The stands also host several rare herbaceous species, some of which are considered relics in the Great Plain, such as Carex paniculata, C. pseudocyperus, Cirsium palustre, Dryopteris carthusiana, D. dilatata, D. expansa, Listera ovata, Thelypteris palustris, Urtica kioviensis, and Veratrum album.

Styles APA, Harvard, Vancouver, ISO, etc.

33

Savage, Rudolph P. « EXPERIMENTAL STUDY OF DUNE BUILDING WITH SAND FENCES ». Coastal Engineering Proceedings 1, n^o 8 (29 janvier 2011) : 22. http://dx.doi.org/10.9753/icce.v8.22.

Texte intégral

Résumé :

In 1957 the State of North Carolina, in cooperation with the Beach Erosion Board and the Wilmington District of the Corps of Engineers undertook an experimental dune building study on the Outer Banks of North Carolina. The experimental study consists of the construction of various types and arrangements of sand fences to determine the fence type and arrangement most effective in building a dune by trapping windblown sand. Four miles of experimental fencing were constructed in 1960. During the following year, four sets of profiles were made to determine the sand accumulation of the fences and a rather intermittent wind record was made in the area. The performance of the various fence types and arrangements has been compared and some conclusions have been reached concerning the best fence type and arrangement.

Styles APA, Harvard, Vancouver, ISO, etc.

34

Bo, Tian-Li, Shao-Zhen Duan, Xiao-Jing Zheng et Yi-Rui Liang. « RETRACTED : The influence of sand bed temperature on lift-off and falling parameters in windblown sand flux ». Geomorphology 204 (janvier 2014) : 477–84. http://dx.doi.org/10.1016/j.geomorph.2013.08.026.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

35

UDA, Takaaki, Shinya NAITO et Hiroko YAGI. « FORMATION OF SAND DUNES AROUND KIKUGAWA RIVER FACING ENSHU-NADA SEAAND ESTIMATION OF RATE OF LANDWARD WINDBLOWN SAND ». Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering) 78, n^o 2 (2022) : I_193—I_198. http://dx.doi.org/10.2208/jscejoe.78.2_i_193.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

36

Zhang, Zhihai, Hong Xiao, Yang Wang, Jia Fang, M. M. Nadakatti et Haoyu Wang. « Experimental study and discrete element analysis on lateral resistance of windblown sand railway ». Transportation Geotechnics 34 (mai 2022) : 100740. http://dx.doi.org/10.1016/j.trgeo.2022.100740.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

37

Zheng, Xiaojing. « Evolution of windblown sand flux and dune field — Trans-scale modeling and simulation ». Theoretical and Applied Mechanics Letters 1, n^o 4 (2011) : 042001. http://dx.doi.org/10.1063/2.1104201.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

38

YOKOTA, Takuya, Akio KOBAYASHI, Takaaki UDA et Yasuhito NOSHI. « BEACH CHANGES OWING TO CONSTRUCTION OF ARTIFICIAL REEFS AND PREDICTION OF WINDBLOWN SAND ». Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 78, n^o 2 (2022) : I_457—I_462. http://dx.doi.org/10.2208/kaigan.78.2_i_457.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

39

Bo, Tian-Li, Xiao-Jing Zheng, Shao-Zhen Duan et Yi-Rui Liang. « RETRACTED : The influence of sand diameter and wind velocity on sand particle lift-off and incident angles in the windblown sand flux ». Sedimentary Geology 290 (mai 2013) : 149–56. http://dx.doi.org/10.1016/j.sedgeo.2013.03.013.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

40

Shi, Long, Dongyuan Wang, Kai Cui et Chunxiao Xue. « Comparative evaluation of concrete sand-control fences used for railway protection in strong wind areas ». Railway Engineering Science 29, n^o 2 (16 janvier 2021) : 183–98. http://dx.doi.org/10.1007/s40534-020-00228-5.

Texte intégral

Résumé :

AbstractConcrete-plate fences have been widely adopted for windblown sand control and mitigation along railways. However, the inclination angles of inserting the concrete plate with respect to the vertical direction, i.e., straight or obliquely inserted concrete plates (SIP or OIP), significantly influence the efficiency of sand-control. This study performs a comparative evaluation of the SIP and OIP sand-control fences using wind tunnel testing and field monitoring data collected from the Lanzhou–Wulumuqi High-Speed Railway Project. The results show that the fence’s ability to reduce the wind speed and the sand-retaining efficiency gradually weakens with the increasing wind speed. Compared with the SIP fence, the OIP fence has a better wind speed reduction capability, stronger ability to capture fine particles below the top of the fence; it is more efficient for sand-retaining and induces stronger eddy intensity. Generally, the wind tunnel test and field monitoring results are consistent, whereas wind tunnel tests incline to overestimate wind speed reduction and sand-control efficiency. The study also finds that the aeolian sand accumulated around the fence can weaken the protection efficiency, and hence cleaning the aeolian sand accumulated around the fence should be done periodically to ensure the designed functions.

Styles APA, Harvard, Vancouver, ISO, etc.

41

Hyder Abd Elwahab, Motasim, et Hussain Mohammed Ahmed Abuzeid. « Textural Analysis of Windblown Sand as an Indicator of Susceptibility of Wind Erosion in Atbara Area, River Nile State, Sudan ». Omdurman Islamic University Journal 18, n^o 1 (10 mai 2022) : 257–72. http://dx.doi.org/10.52981/oiuj.v18i1.2270.

Texte intégral

Résumé :

Textural Analysis of Windblown Sand (TAWS) is essential for understanding the characteristics of wind sediment and behaviors of grain movement particularly in the climatically frame of wind erosion. This paper aimed to generate preliminary quantitative data on TAWS by estimating grain size distribution and some textural parameters e.g. median diameter (M50), mean grain size (Mz), graphic standard deviation (σ1) inclusive graphic skewness (Ski) and transgraphic kutosis (KG) in three selected sites namely, north, south east and south Atbara in river Nile state. Coefficient variations of the (M50) and (Mz) results exhibited a colossal similarity with minor differences between them accounted about 1.12%. In spite of the high variability of (σ1) between three sites (30%) but the data can be characterized as very well sorted (< 35), so the study area can be described as highly susceptible to wind erosion, the susceptibility decreased in the following order: north Atbara > south east Atbara> south Atbara. Regarding to (Ski) results the three sites can be described as positively skewed (north and south east Atbara) and very positively skewed (south Atbara). The (KG) data showed leptokurtic (north and south Atbara) and mesokurtic (south east Atbara). The dominant mean grain sizes for sand samples for north Atbara were fine sand 34% and medium sand 50%. Whereas the samples of south east Atbara distributed fine sand 34%, medium sand 45% and courses and 5%. South Atbara gave 25%, 38% and 12% for fine, medium and courses sand respectively.

Styles APA, Harvard, Vancouver, ISO, etc.

42

Thomas, Kathryn A., et Margaret Hiza Redsteer. « Establishment of Salsola tragus on aeolian sands : A Southern Colorado Plateau case study ». Invasive Plant Science and Management 12, n^o 02 (2 mai 2019) : 124–32. http://dx.doi.org/10.1017/inp.2019.7.

Texte intégral

Résumé :

AbstractRussian-thistle (Salsola tragus L.), is a nonnative, C4 photosynthesizing, annual plant that infests disturbed and natural areas in the arid U.S. Southwest. Land managers of natural areas may need to decide whether a S. tragus infestation is potentially harmful and whether it should be actively managed. One factor informing that decision is an understanding of the conditions under which this weed emerges and establishes and how those processes affect where and when infestations occur. We studied S. tragus establishment on aeolian (windblown) sandy soils at Petrified Forest National Park, AZ. Our sites were a previously disturbed sand sheet and a semistabilized sand dune. Measurements in plots on these sites over two growing seasons revealed a similar number of S. tragus seedlings emerging on both sites early in the 2015 growing season. As the season progressed, S. tragus cover (seedling survival and growth) was lower on the sand dune, except for a plot placed entirely on a coppice mound. In 2016, S. tragus seedling emergence and development of cover, measured on plots at both sites, was exceptionally low, as was summer rainfall. A growth chamber assay of seedling emergence from soil and litter samples collected at each site showed emergence was greatest from samples collected where S. tragus litter remained on the soil surface, and otherwise was infrequent. Our study suggests that S. tragus emergence and early establishment are sensitive to low precipitation and that soil-surface microtopography and grass and shrub cover may be determinants of the spatial pattern of infestation on sandy soils. As aeolian sands occur throughout drylands of the U.S. Southwest, deeper understanding of the conditions under which S. tragus seedlings emerge and establish can inform management of this invasive annual in those habitats.

Styles APA, Harvard, Vancouver, ISO, etc.

43

YOKOTA, Takuya, Akio KOBAYASHI, Takaaki UDA, Masumi SERIZAWA, Yasuhito NOSHI et Atsunari KATSUKI. « A MODEL FOR PREDICTING 3-D TOPOGRAPHIC CHANGES DUE TO WINDBLOWN SAND AND WAVES ». Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 75, n^o 2 (2019) : I_469—I_474. http://dx.doi.org/10.2208/kaigan.75.i_469.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

44

Paz, C., E. Suárez, C. Gil et M. Concheiro. « Numerical study of the impact of windblown sand particles on a high-speed train ». Journal of Wind Engineering and Industrial Aerodynamics 145 (octobre 2015) : 87–93. http://dx.doi.org/10.1016/j.jweia.2015.06.008.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

45

Shi, Long, Dongyuan Wang et Kaichong Li. « Windblown sand characteristics and hazard control measures for the Lanzhou–Wulumuqi high-speed railway ». Natural Hazards 104, n^o 1 (17 juillet 2020) : 353–74. http://dx.doi.org/10.1007/s11069-020-04172-9.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

46

Crombé, Philippe, Mark van Strydonck, Mathieu Boudin, Tess van den Brande, Cilia Derese, Dimitri A. G. Vandenberghe, Peter van den Haute et al. « Absolute Dating (14C and OSL) of the Formation of Coversand Ridges Occupied by Prehistoric Hunter-Gatherers in NW Belgium ». Radiocarbon 54, n^o 3-4 (2012) : 715–26. http://dx.doi.org/10.1017/s0033822200047378.

Texte intégral

Résumé :

Based on radiocarbon and optically stimulated luminescence (OSL) results obtained in the last 5 yr, this paper discusses the absolute chronology of the formation of one of the largest sand dunes within NW Belgium, the Great Ridge of Maldegem-Stekene. Multiproxy analysis of 6 sedimentary sequences points to a complex formation history covering the entire Late Glacial. Dry phases, characterized by eolian deflation and sedimentation, alternated with wet phases in which numerous mostly shallow dune slacks were filled with freshwater. The latter reached their highest water level during the first half of the Allerød, attracting both animals (e.g. European elk) and humans (Federmesser hunter-gatherers). Near the end of the Allerød, all dune slacks finally disappeared as they were filled in with windblown sand ("coversand"), likely forcing prehistoric hunter-gatherers to leave the area.

Styles APA, Harvard, Vancouver, ISO, etc.

47

Wu, Hao, Meng Liu, Youzhi Mi, Jun Wang et Menglei Guo. « Key Parameters of a Design for a Novel Reflux Subsonic Low-Density Dust Wind Tunnel ». Aerospace 9, n^o 11 (27 octobre 2022) : 662. http://dx.doi.org/10.3390/aerospace9110662.

Texte intégral

Résumé :

The dust storm on the surface of Mars is a severe threat to Mars exploration missions. Taking adequate measures to avoid the impact of the harsh wind-blown dust environment is indispensable. Ground simulation of the Martian high-speed windblown dust environment is helpful for analysis of the environmental effects and evaluations of the suitability of the components and materials. In this paper, a novel reflux subsonic low-density dust wind tunnel is presented to simulate the high-speed windblown dust environment of the Martian atmosphere with a velocity of more than 100 m/s. The sand and dust are fed into the wind tunnel through the ejector assembly together with the compressed gas, resulting in high uniformity of particles in the test section. The construction design of the Mars wind tunnel is introduced. The key parameters, which are the nozzle parameters and the contraction curve, are discussed in detail. The convergent nozzle is most suitable for the ejector assembly. Moreover, the bicubic curve is selected as the contraction curve. The gas-particle two-phase computational fluid dynamic (CFD) simulations demonstrate the rationality of the wind tunnel design.

Styles APA, Harvard, Vancouver, ISO, etc.

48

Kinnaird, Tim C., David C. W. Sanderson et Naomi L. Woodward. « Applying luminescence methods to geoarchaeology : a case study from Stronsay, Orkney ». Earth and Environmental Science Transactions of the Royal Society of Edinburgh 102, n^o 3 (15 août 2012) : 191–200. http://dx.doi.org/10.1017/s1755691012011115.

Texte intégral

Résumé :

ABSTRACTLuminescence methods were used to date a palaeoenvironmental coastal exposure on Stronsay, Orkney. The section consists of glacial sediments that are overlain by intercalated peats and windblown sands, implying varying past environmental conditions. Rapid luminescence characterisation was undertaken using screening methods in combination with quantitative dating of selected samples, providing information on depositional processes and chronology. A temporal discontinuity between the glacial sediments and later peats encompasses the period associated with an important Mesolithic site located inland, and implies erosional episodes. The onset of blanket bog formation on Stronsay dates to 3760±330 yrs BP, consistent with observations elsewhere in Orkney and northern Scotland. Periods of enhanced aeolian activity on Stronsay occurred in the late Bronze Age (2700±265 yrs BP) and at the beginning of the Little Ice Age (650±75 yrs BP). Recent periods of sand deposition in the 19th and 20th centuries (AD 1865±20 and 1960±5) correspond to periods of known historic storminess. These results add to an expanding catalogue of data on sand movements throughout the Holocene in Orkney, and set a framework to interpret the evolution of nearby archaeological and natural landscapes from prehistoric to modern times.

Styles APA, Harvard, Vancouver, ISO, etc.

49

YOKOTA, Takuya, Akio KOBAYASHI, Takaaki UDA, Yasuhito NOSHI et Masumi SERIZAWA. « MODEL FOR PREDICTING TOPOGRAPHIC CHANGES ON BEACHES COMPOSED OF SAND OF MIXED GRAIN SIZE DUE TO WAVES AND WINDBLOWN SAND ». Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 77, n^o 2 (2021) : I_433—I_438. http://dx.doi.org/10.2208/kaigan.77.2_i_433.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

50

Ebinger, John E., Loy R. Phillippe, Randy W. Nÿboer, William E. McClain, Daniel T. Busmeyer, Kenneth R. Robinson et Geoffrey A. Levin. « Vegetation and Flora of the Sand Deposits of the Mississippi River Valley in Northwestern Illinois ». Illinois Natural History Survey Bulletin 37, n^o 1-6 (31 octobre 2006) : 191–238. http://dx.doi.org/10.21900/j.inhs.v37.122.

Texte intégral

Résumé :

This study was undertaken to determine vascular plant species composition, vegetation structure, and floristic quality of the major plant communities in the windblown sand deposits of northwestern Illinois during the growing seasons of 2002 through 2005. The major plant communities of the Ayers Sand Prairie Nature Preserve in Carroll County, Big River State Forest in Henderson County, Lost Mound Unit of the Upper Mississippi River Wildlife and Fish Refuge in Carroll and Jo Daviess counties, and the Thomson-Fulton Sand Prairie Nature Preserve located in Whiteside County were examined and the importance values determined for the plant species present. Located on broad terraces of the Mississippi River, these nature preserves and natural areas are remnants of a larger grassland/savanna/forest complex that contained extensive marsh; wet, mesic, and dry sand prairie; sand savanna; and sand forest communities. Most of the sand deposits are now cultivated and the original vegetation is found only in protected remnants, some of which are relatively large. The mature dry sand prairies were dominated by Schizachyrium scoparium; other important species were Opuntia macrorhiza, Dichanthelium villosissimum, Ambrosia psilostachya, and Tephrosia virginiana. Other assemblages of prairie and exotic species were encountered in successional sand prairie communities. Generally, the mature prairie communities in these preserves and natural areas had 35 or more species present in the study plots. Savanna and closed canopy forest communities were also examined. The dry sand savannas were dominated by Quercus velutina and Q. marilandica, dry sand forests were dominated by Q. velutina, and dry-mesic sand forests were dominated by Q. alba and Q. velutina.

Styles APA, Harvard, Vancouver, ISO, etc.

Articles de revues sur le sujet « Windblown sand »

Créez une référence correcte selon les styles APA, MLA, Chicago, Harvard et plusieurs autres