Zmienność kształtu wydm gwiaździstych w obszarach o bimodalnym reżimie wiatru

• Autorzy: Biejat K.

Warianty tytułu

EN

Star dune shape variability in the area of bimodal wind regime

• Języki publikacji: PL

Abstrakty

EN

Contemporary morphological changes of star dunes are observed mainly in certain parts of these dunes. They occur as lateral migration of crestlines of dune arms and modifications of inclination of their slopes. The aim of the research was to determine annual variability of shapes of compound and complex star dunes in bimodal wind regime. Precise measurements of 5 star dunes were performed with use of GPS RTK in March, 2011, and March, 2012, on Erg Chebbi (Morocco). Based on these measurements, 3D models of the dunes were created, which in turn, allowed for calculation of annual magnitude and direction of crestlines migration of star dune main arms. The results show that the resultant drift direction was in accordance with long-term regime of active wind in the study area. Both, the resultant drift direction and its magnitude were similar in all studied dunes. Variability of star dune shapes occurred to be independent from their stage of development (size of a dune) or its type. The most important feature determining morphodynamics of the star dune arms are: i) the angle between the arms and the active wind, and ii) slope inclination of the arms.

Słowa kluczowe

PL

wydmy gwiazdziste; ksztalt wydm; rezim wiatru; rezim bimodalny; wiatry

• Wydawca: -
• Czasopismo: Prace i Studia Geograficzne
• Rocznik: 2012
• Tom: 49
• Opis fizyczny: s.33-45,rys.,tab.,bibliogr.

Twórcy

autor

Biejat K.

• Zakład Geomorfologii, Zakład Geografii Turyzmu i Rekreacji, Wydział Geografii i Studiów Regionalnych, Uniwersytet Warszawski w Warszawie, Warszawie

Bibliografia

• Benalla M., Alem M., Rognon P., Desjardins R., Hilali A., Khardi A., 2003, Les dunes du Tafilalet (Maroc): dynamique éolienne et ensablement des palmeraies, Sécheresse, Volume 14, 2, 73-83.
• Benmohammadi A., 2001, Ensablement et désertification au sud-est Marocain: Trajectoires éoliennes et origine du sable des vallées de Drâa, Ziz et Rhéris, Thése de Doctorat d'Etat, Université Ibn Tofial, Faculté des Sciences, Kenitra.
• Biejat w druku, Reżim wiatru a rozwój wydm gwiaździstych Ergu Chebbi (południowe Maroko), Landform Analysis.
• Breed C.S., Grow T., 1979, Morphology and distribution of dunes in sand seas observed by remote sensing, [w:] E.D. McKee (red.), A study of global sand seas, US Geol. Surv. Prof. Pap., 1052, 253-301.
• Fryberger S.G., 1979, Dune forms and wind regime, [w:] E.D. McKee (red.), A Study of Global Sand Seas, US Geol. Surv. Prof. Pap., 1052, 137-169.
• Fryberger S.G., Goudie, A.S.,1981, Arid geomorphology, Prog. Phys. Geogr., 5, 409-428
• Laity J., 2008, Desert and Desert Environments, Wiley-Blackwell, 1-357.
• Lancaster, N., 1983, Controls of dune morphology in the Namib Sand Sea. [w:] M.E. Brookfield and T.S. Ahlbrandt (red.), Aeolian Sediments and Processes, Elsevier, Amsterdam, 289-296.
• Lancaster N., 1989, Star dunes, Prog. Phys. Geogr., 13, 67-91.
• Lancaster N., 1995, Geomorphology of Desert Dunes, Routledge, London&New York, 1-264.
• Lancaster, N., 2009, Dune Morphology and Dynamics, Geomorphology of Desert Environments. Springer, Netherlands, 557-595.
• Liu B., Qu J, Zhang W., Qian G., 2011, Numerical simulation of wind flow over transverse and pyramid dunes, J. Wind Eng. Ind. Aerodyn., 99, 879-888.
• McKee E.D., 1982, Sedimentary Structures in Dunes of the Namib Desert, South West Africa. Geol. Soc. Am. Spec. Pap., 188, 64.
• Nielson J., Kocurek, G., 1987, Surface processes, deposits, and development of star dunes: Dumont dune field, California. Bull. Geol. Soc. Am., 99, 177-186.
• Tsoar, H., 1983, Dynamic processes acting on a longitudinal (seif) dune, Sedimentology, 30, 567-578.
• Tsoar, H., Rasmussen, K.R., Sorensen, M. and Willetts, B.B., 1985, Laboratory studies of flow over dunes. [w:] O.E. Barndorff-Nielsen, J.T. Møller, K.R. Rasmussen and B.B. Willetts (red.), International Workshop on the Physics of Blown Sand, Proceedings, Department of Theoretical Physics, Institute of Mathematies, University of Aarhus, Memoirs, 8, 327-350.
• Wang T., Zhang W., Dong Z., Qu J., Jing Z., Wang W., Feng J., 2005, The dynamic characteristies and migration of a pyramid dune, Sedimentology 52, 429-440.
• Wasson R.J., Hyde R., 1983, Factors determining desert dune type, Nature, 304, 227-578
• Wilson, I.G., 1973, Ergs, Sedimentary Geology, 10, 77-106.
• Zhang W., Qu J., Dong Z., Li X., Wang W., 2000, The airflow field and dynamic processes of pyramid dunes, Journal of Environments, 45, 357-368.