نتایج جستجو برای: reduced river reach
تعداد نتایج: 755577 فیلتر نتایج به سال:
The Hanford Reach of the Columbia River is a free flowing stretch that exists within the Hanford Nuclear Reservation in south central Washington, USA. Operations at the reservation have resulted in contamination of ground water with chromium and other chemical and radiological constituents. Ground water discharges into the Columbia River occur in areas where chinook salmon (Oncorhynchus tshawys...
Dams have long been associated with elevated burdens of human schistosomiasis, but how dams increase disease is not always clear, in part because dams have many ecological and socio-economic effects. A recent hypothesis argues that dams block reproduction of the migratory river prawns that eat the snail hosts of schistosomiasis. In the Senegal River Basin, there is evidence that prawn populatio...
During a 2-day period at Skamania Lodge in Stevenson, Washington, overlooking the Columbia River Gorge, a multidisciplinary group of health care providers reviewed data available on trauma systems in North America in an attempt to clarify future directions. Like the explorers Lewis and Clark, whose journey brought them down the Columbia River, the participants knew where they wanted to go, but ...
Low-water bridges are a common and economical way to ford unimproved roads in forested upland ecosystems. We initiated a study to measure the influence of these road crossings on fish movement and fish communities. We established three sample sites in each of six upland &ibutaries of the Ouachita River, Arkansas. The three sample sites included a 50-m reach upstream of a low-water bridge, anoth...
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