Significant areas of coastal wetlands have been restored and enhanced in Port Arthur, Texas. The largest restoration took place in the Lower Neches Wildlife Management Area near the Gulf of Mexico where historic water flow has been brought back into roughly 1,300 acres of wetland.

The other main restoration site is located within the J.D. Murphree Wildlife Management Area where approximately 1,500 acres of coastal emergent marsh plant communities have been restored to historical conditions through the installation of berms and other water control structures.

Almost 90 acres of estuarine intertidal marsh and over 30 acres of coastal wet prairie have also been established by NOAA in conjunction with the U.S. Fish and Wildlife Service, the Texas Commission on Environmental Quality, the Texas Parks and Wildlife Department, the Texas General Land Office, and the Chevron Corporation.

“Coastal wetlands are extremely valuable habitats that provide numerous services for both humans and the environment,” said John H. Dunnigan, assistant administrator for NOAA’s National Ocean Service. “The wetlands restored through this cooperative project will help improve water quality and provide a buffer as tropical storms and hurricanes move onshore.”

The restored wetlands are a way for Chevron to compensate the public for the injury caused by the Clark Chevron refinery in Port Arthur. The refinery, which commenced production in 1902, caused substantial injury to natural areas and waterways inside and adjacent to the processing plant by releasing hazardous substances into the environment.

“These completed projects will not only provide habitat benefits to the fish and wildlife of the region, but will also enhance public use and outdoor recreation opportunities,” said Wildlife Management Area manager Jim Sutherlin.

The restoration is a part of NOAA’s Damage Assessment, Remediation and Restoration Program. Through this program, NOAA works with industry, agencies and communities to restore environments harmed by oil spills, hazardous substance releases and ship groundings. Last year, the program settled nearly 200 natural resource damage assessment cases, generating almost $450 million for restoration projects.

According to University of Washington geologist and tsunami expert Jody Bourgeois, the idea that chevrons – a type of large U- or V-shaped formations found along certain coasts – were caused by mega-tsunamis is pure nonsense.

The term chevron refers a special type of vast dunes shaped a bit like the stripes on soldier’s uniform. They can be anything from hundreds of meters to a kilometre in length and can be seen in places such as Egypt, the Bahamas, Madagascar, and Australia.

Some scientists have suggested that a possible explanation for these mysterious stripes is mega-tsunamis caused by asteroid or comet impact. According to this school of thought, the chevrons may be deposits left by gigantic tsunamis 4,800 to 5,000 years ago, tsunamis that might have been up to 10 times larger than the earthquake-caused Indian Ocean tsunami of December 2005. Due to the location of known chevrons, the Indian Ocean has been suggested as ground zero for the comet or asteroid impact.

Bourgeois, a professor of Earth and space sciences who has studied earthquakes and tsunamis in various parts of the world, does not agree. According her, the chevrons are not lined up the way you would expect from deposits caused by gigantic waves. Many of the chevrons on Madagascar are for instance parallel to the coastline, instead of perpendicular to the shore.

Models created by Bourgeois’ colleague Robert Weiss, assistant professor of geology at

Texas A&M University, show that deposits formed by gigantic tsunamis would point in the same direction as the waves were travelling when the reached land, which is mostly perpendicular to the shore.

“And if it really was from an impact, you should find evidence on the coast of Africa too, since it is so near,” Bourgeois explains.

The computer model generated actual conditions for a tsunami which made it possible to use the model to explore the effects of an asteroid or comet hitting the part of the Indian Ocean suggested by mega-tsunami chevron proponents. According to the model, the gigantic waves would approach land at a 90-degree orientation to the chevron deposits.

“The model shows such a tsunami could not have created these chevrons, unless you have some unimaginable process at work,” Bourgeois says.

Bourgeois and Weiss have used satellite images from Google Earth to get close-up looks at chevrons in different locations. Chevron are most common in coastal regions but you can find quite a lot of them in semiarid inland areas as well.

Bourgeois and Weiss wrap up their paper, which can be found in the May issue of the journal Geology, by stating that “the extraordinary claim of ‘chevron’ genesis by megatsunamis cannot withstand simple but rigorous testing. […] There are the same forms in the Palouse in eastern Washington state, and those are clearly not from a tsunami.”