As scientists begin to assess the impact of the first tropical storm of the 2010 hurricane season on a massive oil spill in the Gulf of Mexico, the fight to seal the leaking well and protect the coastline continues. Image Photo: Courtesy of NASA Earth Observatory Tropical storms are a wild-card factor in predicting the behavior of the oil still gushing from the site of a deeptwater-well blowout in the Gulf of Mexico, shown here in a satellite view taken on June 26. Scientists want to improve their predictions of oil-spill behavior when slicks are assailed by major storms like
Arch dams, classically curved monoliths situated in narrow valleys, are not as common as other types of dams, such as embankment dams and gravity dams. ENR takes a look at some of the biggest arch dams in the world, both completed and under construction.