منابع مشابه
Hydrology and Erosion Impacts of Mining Derived Coastal Sand Dunes,
Chile has an economy strongly based on the exploitation of its natural resources. Copper mining represents the main export monetary income, employing thousands of people all along the country. The Chilean Copper Corporation (CODELCO), El Salvador branch, has been the primary mining company, but it will be ending most of its activities by 201 1 unless copper prices stay at their record levels. B...
متن کاملBooming Sand Dunes
Booming” sand dunes have a remarkable capacity to produce sounds that are comparable with those from a stringed instrument. This phenomenon, in which sound is generated after an avalanching of sand along the slip face of a dune, has been known for centuries and occurs in at least 40 sites around the world. A spectral analysis of the sound shows a dominant frequency between 70 and 110 Hz, as wel...
متن کاملGreat Sand Dunes
Endemic species are those that exist at only one location or area on Earth. They tend to be more numerous in habitats that are distinctly different from the surrounding areas. The Great Sand Dunes harbor at least seven endemic species of insects. Many of the insects here are ‘sand obligates’, meaning that they are adapted uniquely for sandy habitats. Currently, just over 1,000 different kinds o...
متن کاملMinimal model for sand dunes.
We propose a minimal model for aeolian sand dunes. It combines an analytical description of the turbulent wind velocity field above the dune with a continuum saltation model that allows for saturation transients in the sand flux. The model provides a qualitative understanding of important features of real dunes, such as their longitudinal shape and aspect ratio, the formation of a slip face, th...
متن کاملEarly Successional Microhabitats Allow the Persistence of Endangered Plants in Coastal Sand Dunes
Many species are adapted to disturbance and occur within dynamic, mosaic landscapes that contain early and late successional microhabitats. Human modification of disturbance regimes alters the availability of microhabitats and may affect the viability of species in these ecosystems. Because restoring historical disturbance regimes is typically expensive and requires action at large spatial scal...
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ژورنال
عنوان ژورنال: Geographical Review of Japa,. Ser. A, Chirigaku Hyoron
سال: 1989
ISSN: 0016-7444,2185-1735
DOI: 10.4157/grj1984a.62.2_129