In many of the Earth's arid and semiarid lands, saline lakes, playas, and similar landforms are disturbed as a result of human activity. The dessication of playa systems is accomplished by abstraction of water and/or removal of vegetation from
in the form of fugitive dust, and has environmental and economic impacts on human activities. Restoration has been accomplished on some playas.
Wassergehalt und Grauwertvarianz im Landsat-Bild. Beispiel: Willox Playa, Arizona. in Wasserhaushalt und Gewässer. Festschrift zum 60. Geburtstag von Professor Dr. Reiner Keller.. (Teneur en eau et variation des valeurs grises sur une image Landsat
. L'exemple de Willox Playa, Arizona)
Arizona ; Etats-Unis ; Généralités sur la géographie ; Humidité du sol ; Image Landsat ; Télédétection ; Willox Playa
L'apparition de mauvaises corrélations ou de corrélations inverses entre la surface de la playa nue, à forte teneur en illite et en sel et la valeur grise signifie seulement que la teneur en eau est masquée par un ou plusieurs facteurs parmi
This study simulates how spatial variations in particle-size emissions from a playa affect bulk and size-resolved dust concentration profiles during 2 contrasting wind erosion events (a small local and a large regional event) in the Channel Country
, Lake Eyre Basin, Australia. The regional event had higher dust concentration as a result of stronger frontal winds and higher erodibility across the playa. For each event, 2 emission scenarios are simulated to determine if measured size-resolved dust
Saltating particles, playa crusts and dust aerosols at Owens (dry) Lake, California
Aérosol ; California ; Domaine aride ; Encroûtement ; Eolien ; Erosion éolienne ; Etats-Unis ; Lac ; Playa ; Tempête de poussière ; Transport éolien
The AA. have studied the generation of dust storms on the south sand sheet of Owens (dry) Lake, an anthropogenically dessicated playa reported to be the single greatest source of particulate matter in North America. During March 1993, they performed
of playa surfaces results in the generation of PM10 dusts (aerosol particles smaller than 10 μm aerodynamic diameter).
Projects LODE (Lake Owens Dust Experiments) took place on the anthropogenically desertified playa and surrounding regions of Owens Lake, in east-central California. Optical depth measurements were taken and aerosol samples were obtained during dust
Holocene desert soil formation under sodium salt influence in a playa-margin environment
not form in parent materials that are still calcareous. This Natrargid formed in a playa-margin environment, where clay for translocation and sodium salts that engender rapid clay movement probably were provided by dust fall.
The factors influencing the abrasion efficiency of saltating grains on a clay-crusted playa
This paper reports on a series of portable wind tunnel tests conducted on a system of clay-crusted playas along the Bouse Wash, near Desert Wells, Arizona, to examine the importance of saltation abrasion in the emission of PM10 (particulate matter
and limestone. More than 100 closed depressions (solution dolines) have been formed in the soluble sediments of this area, some of them hosting saline lakes or playas. This work analyses the processes (past and present) which have given rise to these landforms
and establishes the geomorphological evolution of playa-yardang systems.
Cycles of sand-flat sandstone and playa-lacustrine mudstone in the Triassic-Jurassic Blomidon redbeds, Fundy rift basin, Nova Scotia : implications for tectonic and climatic controls