Skip to main content
Advanced Search

Filters: Tags: Environmental geology (X) > Extensions: Citation (X)

3 results (80ms)   

View Results as: JSON ATOM CSV
Global demand for energy has increased by more than 50 percent in the last half-century, and a similar increase is projected by 2030. This demand will increasingly be met with alternative and unconventional energy sources. Development of these resources causes disturbances that strongly impact terrestrial and freshwater ecosystems. The Marcellus Shale gas play covers more than 160,934 km(2) in an area that provides drinking water for over 22 million people in several of the largest metropolitan areas in the United States (e.g. New York City, Washington DC, Philadelphia & Pittsburgh). Here we created probability surfaces representing development potential of wind and shale gas for portions of six states in the Central...
Because of the interdiscriplinary requirements of studies of river-floodplain systems, development of this field in the United States has been slow, and much information needed for watershed and river-basin planning is not available. This is particularly true in the southwestern United States, where study has been further complicated within the last 50 years by the introduction and spread of saltcedar (Tamarix chinensis)which has occurred simultaneously with other independently generated environmental changes. The spread of saltcedar has been aided both by purposeful planding and by a fortuitous combination of events that has weakened the native ecosystem at the time that seeds of the new species have been made...
Mining activities in the Blue River Basin, Summit County, Colorado, have affected the trace- element chemistry and biota along French Gulch and the Blue River. Elevated concentrations of As, Cd, Cu, Pb, and Zn were present in the bed and suspended sediments. Bed sediment trace-element concentrations were high in the streams in and near mining activities in the basin and remained high as water flowed into Dillon Reservoir about 3.5 km downstream. Bed-sediment ( < 63 mm) data were useful in assessing the distribution of trace elements in the basin. Suspended-sediment measurements provided information as to the transport of the trace elements. Filtered ( < 0.45 mm) water- column trace-element concentrations were orders...