Recent Geomorphic Changes in Playas of Western United States

Neal, James T.; Motts, Ward Sundt

doi:10.1086/627279

Cited by 57 publications

(33 citation statements)

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“…The term playa as used for the past 100 years (Johnson and Oliver 1997) is broadly defined as the flat and generally lower portions of arid basins with internal drainage that periodically flood and accumulate sediment (Neal 1975) (Fig. 1).…”

Section: Playasmentioning

confidence: 99%

“…2]) originated as Pleistocene lakes (e.g., Kerr and Langer 1965) but dried as a result of climatic change or from change in stream inflow or outflow. In all of the United States, there are about 300 large playas, at least 120 of which are the relicts of Pleistocene lakes (Cooke et al 1993);Neal (1975) estimated that there are about 50,000 playas on earth, the vast majority being a few square kilometers or less in size. Fewer than 1,000 cover more than 100 km 2 (38.61 mi 2 ).…”

Section: Playasmentioning

confidence: 99%

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Final Report on Contract N00014-92-C-0173 (Office of Naval Research)

Philpott¹

2001

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Section: Playasmentioning

confidence: 99%

Section: Playasmentioning

confidence: 99%

Final Report on Contract N00014-92-C-0173 (Office of Naval Research)

Philpott¹

2001

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“…Playas are very sensitive indicators of changing environment and show a wide range of climatic, hydrologic, and geomorphic responses (Neal and Motts, 1967;Neal et al, 1968, Neal, 1972, Krinsley et al, 1968. Large fissures in playas reveal long-term geohydrologic response and are one indicator of man's activities, or of climatic change.…”

Section: Playa-surface Trafficabilitymentioning

confidence: 99%

Swords into plowshares

Neal

1998

Military Geology in War and Peace

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Military geology and national security projects are often comparable, achieving their raison d'etre in support of national goals, military operations, and/or systems-all for vital national interests. The application of Geoscience to these ends, especially engineering geology, has occurred fiom pole to pole and included every conceivable environment and natural condition. In the conduct of such projects, the Geosciences have advanced, and vice versa.Desert trafficability, most notably regarding playa surfaces, is both temporary and variable and not a persistent condition as some early authors believed.Playas in Australia, Iran, and the U. S. show that saline efflorescence is removed following surface water dissolution and subsequent deflation, resulting in very hard crusts. Magadiite, a hydrous sodium silicate and possible precursor of bedded chert, was first discovered in North America at Alkali Lake, OR, during a military project. Pleistocene Lake Trinity, a small and mostly buried evaporite basin in the northern Jornada del Muerto, NM, was discovered during exploratory drilling in support of a military test program.The Strategic Petroleum Reserve (SPR), operated by the U. S. Department of Energy, has underground cavern storage of -600 MMB of crude oil in five Gulf Coast salt domes. The geologic characterization of sites for the SPR program is a major component of these comprehensive engineered works unparalleled in modem times, on scale with the Panama Canal. Numerous studies of salt-stock heterogeneity, salt-karst features, and structural and physical attributes of salt deposits are broadening our database for use in the commercial storage sector.Geological practitioners serving in military and national security endeavors are fully fbnctioning members of the project technical teams, and have made significant advances to the discipline.

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“…Types of playa surfaces have been used by various investigators (Neal, 1965a;Langer and Kerr, 1966;Neal and Motts, 1967;Hagar, 1970) to characterize play as. Several surface types occur on Franklin Lake playa and the near vicinity: (1) hard, compact; (2) soft, puffy, porous; (3) salt pan; (4) stream channel; (5) vegetation; and (6) desert pavement.…”

Section: Playa Surfacesmentioning

confidence: 99%

Geohydrology and evapotranspiration at Franklin Lake playa, Inyo County, California

Czarnecki¹,

Stannard²

1997

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Recent Geomorphic Changes in Playas of Western United States

Cited by 57 publications

References 0 publications

Final Report on Contract N00014-92-C-0173 (Office of Naval Research)

Final Report on Contract N00014-92-C-0173 (Office of Naval Research)

Swords into plowshares

Geohydrology and evapotranspiration at Franklin Lake playa, Inyo County, California

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