منابع مشابه
Development of a three-dimensional model of sedimentary texture in valley-fill deposits of Central Valley, California, USA
A three-dimensional (3D) texture model was developed to help characterize the aquifer system of Central Valley, California (USA), for a groundwater flow model. The 52,000-km Central Valley aquifer system consists of heterogeneous valley-fill deposits. The texture model was developed by compiling and analyzing approximately 8,500 drillers’ logs, describing lithologies up to 950m below land surfa...
متن کاملPatterns of plant species diversity following local extinction of the plains vizcacha in semi-arid scrub
We examined changes in the diversity of herbaceous plant species at colony ( ) sites of the plains vizcacha Lagostomus maximus following local extinctions of this species in semi-arid scrub of central Argentina. These large rodents live in social groups, share a communal burrow system, and forage in a common home range around the burrow system. Through intense herbivory, vizcachas create large ...
متن کاملProperties and Variability of Soil and Trench Fill at an Arid Waste-Burial Site
Arid sites commonly are assumed to be ideal for long-term isolation of wastes. Information on properties and variability of desert soils is limited, however, and little is known about how the natural site environment is altered by installation of a waste facility. During fall construction of two test trenches next to the waste facility on the Amargosa Desert near Beatty, NY, samples were collec...
متن کاملFlow Patterns of Lobate Debris Aprons and Lineated Valley Fill North of Ismeniae
Introduction: Lobate debris aprons (LDA) and lineated valley fill (LVF) surrounding plateaus and isolated massifs have been documented in numerous locations in the northern mid-latitudes on Mars [1-8]. While there has been agreement that these features represent Amazonian-aged modification of the dichotomy boundary from ice-assisted debris flows [e.g., 9], the amount of ice and mode of origin o...
متن کاملThe environmental costs of mountaintop mining valley fill operations for aquatic ecosystems of the Central Appalachians.
Southern Appalachian forests are recognized as a biodiversity hot spot of global significance, particularly for endemic aquatic salamanders and mussels. The dominant driver of land-cover and land-use change in this region is surface mining, with an ever-increasing proportion occurring as mountaintop mining with valley fill operations (MTVF). In MTVF, seams of coal are exposed using explosives, ...
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ژورنال
عنوان ژورنال: Science
سال: 1915
ISSN: 0036-8075,1095-9203
DOI: 10.1126/science.42.1081.377