Posts Tagged ‘sediment’

Stirring up question of PCBs

The Indiana Harbor and Ship Canal is located in East Chicago, Ind., on the southwest shore of Lake Michigan. The U.S. Army Corps of Engineers has proposed dredging sediments from the canal to allow its continued use as a navigable waterway. Researchers have discovered that some sediments are contaminated with high levels of polychlorinated biphenyls (PCBs). (Courtesy: Wikimedia)

U. IOWA—The Indiana Harbor and Ship Canal is contaminated with polychlorinated biphenyls (PCBs) and scientists are unsure whether planned dredging in the next few years will help or hurt the situation. Continue…

Wednesday, January 13, 2010 17:38 - 0 Comments

Earth & Environment - Oct 20, 2009 11:32 - 0 Comments

Arctic cores signal ‘unique’ climate shift

U. COLORADO (US)—An analysis of sediment cores indicates that biological and chemical changes occurring at a remote Arctic lake are unprecedented over the past 200,000 years and likely are the result of human-caused climate change. (more…)

Earth & Environment - Oct 5, 2009 19:08 - 0 Comments

Alfalfa sprouts recreate meandering stream

UC BERKELEY (US)—Researchers report the first experimental creation of meanders in a flume—a scaled-down model of a natural channel using alfalfa sprouts to represent vegetated stream banks. The experiments reveal some of the necessary conditions to form meanders on Earth and throughout the solar system. (more…)

Earth & Environment - Sep 21, 2009 15:58 - 0 Comments

Human activity threatens world’s river deltas

An image of the Pearl River Delta in China taken by NASA’s space shuttle Endeavour during the Shuttle Radar Topography Mission in 2000. The areas below sea level are shown in purple. (Courtesy: NASA/CSDMS/University of Colorado)