منابع مشابه
Desiccation and Recolonization of Phytobenthos in a Regulated Desert River: Colorado River at Lees Ferry, Arizona, Usa
We tested the recolonization of the phytobenthic community in the tailwaters of Glen Canyon Dam following longand short-term experimentally induced desiccation. The response of Cladophora glomerata, Oscillatoria spp., miscellaneous phytobenthos species and periphyton was studied over 18 weeks using three treatments: (1) undisturbed control cobbles from the submerged zone; (2) cobbles desiccated...
متن کاملErosion of Ejecta at Meteor Crater, Arizona
New methods for estimating erosion at Meteor Crater, Arizona, indicate that continuous ejecta deposits beyond 1/4-1/2 crater radii from the rim (0.25R-0.5R) have been lowered less than 1 m on the average. This conclusion is based on the results of two approaches: coarsening ofunweathered ejectainto surface lag deposits and calculation of the sediment budget within a drainage basin on the ejecta...
متن کاملWind Erosion Assessment in Austria Using Wind Erosion Equation and GIS
Soil erosion by wind is a serious problem in many parts of Europe and leads to degradation of the resource soil. In order to achieve sustainable land use, tools to identify problem areas and to evaluate environmental sound management practices are needed and necessary. Until now no wind erosion measurements have been carried out in Austria. For the fist time assessment of soil erosion by wind h...
متن کاملAssessment of Wind Erosion Parameters Using Wind Tunnels
*Lawrence J. Hagen, USDA-ARS, Wind Erosion Research Unit, Throckmorton Hall 2004, Kansas State University, Manhattan, KS 66506. *Corresponding author: [email protected]. Contribution from USDA-ARS in cooperation with Kansas Agric. Exp. Sta., Contribution No. 99-389-A. ABSTRACT Assessment of wind erosion parameters applicable to the field scale using wind tunnels requires attention to both scal...
متن کاملPlant Canopy Effects on Wind Erosion Saltation
Maintaining standing vegetative soil cover is an important method of wind erosion control. However^ an improved physical understanding of the mechanisms by which standing vegetation control wind erosion is needed so the erosion control level of vegetation not previously tested in a wind tunnel can be calculated. In this report, a theoretical approach that accounts for both the surface friction ...
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ژورنال
عنوان ژورنال: American Journal of Science
سال: 1923
ISSN: 0002-9599
DOI: 10.2475/ajs.s5-6.34.291