The Gulf of Mexico: what role will the Mississippi River play in
oil washing ashore and into delta wetlands?
One of the spill's greatest environmental threats is to
Louisiana's wetlands, scientists believe.
But there may be good news ahead.
Scientists affiliated with the National Center for Earth-surface
Dynamics (NCED), a National Science Foundation (NSF) Science and
Technology Center headquartered at the University of Minnesota, are
using long-term field plots in Louisiana's Wax Lake Delta to
measure the baseline conditions of, and track the effects of the
oil spill on, coastal Louisiana wetlands.
Robert Twilley and Guerry Holm of Louisiana State University
(LSU) are investigating the degree to which two delta wetland
characteristics may help mitigate oil contamination.
Fresh water head, as it's called, the slope of the water's
surface from a river delta to the sea, and residence time of
river-mouth wetlands, the time it takes water to move through a
wetland at a river's mouth, are important to understanding how
delta wetlands will respond to the oil spill, say the
researchers.
"Since the Mississippi River is currently at a relatively high
stage, we expect the river's high volume of freshwater to act as a
hydrologic barrier, keeping oil from moving into the Wax Lake Delta
from the sea," says Twilley.
Twilley and Holm are performing baseline and damage assessments
on the plants and soils of, and comparing oil degradation processes
in, freshwater and saltwater Louisiana wetlands.
"The Mississippi River's 'plumbing' provides a potential benefit
to reducing the movement of oil onshore from shelf waters," says
Twilley.
The Mississippi's flow has been altered for flood control to
protect people and infrastructure in this working delta.
River diversion structures--concrete gates built within the
levees of the river--may be operated, however, to allow water to
flow to specific coastal basins and floodways, says Twilley, "as a
way to provide controlled floods."
The operational features of this system "downriver to the
control structure near Venice, Louisiana," he says, "may provide a
second line of defense against oil washing in."
But any strategy using Mississippi River hydrology must be one
of clear options and tradeoffs, says H. Richard Lane, program
director in NSF's Division of Earth Sciences, which funds NCED.
"As the river stage falls and protection diminishes," says Lane,
"it becomes a question of how best to distribute this freshwater
resource to defend the coast from the movement of oil onshore."
The answer, Twilley says, lies in the delicate balance of river,
coastal and Gulf of Mexico processes "that must work in concert to
benefit the incredible 'ecosystem services' this region provides to
the nation."
Louisiana wetlands "play a vital role in protecting New Orleans
from hurricane damage, providing habitat for wildlife, supporting
economically important fisheries, and maintaining water quality,"
says Efi Foufoula-Georgiou, director of NCED.
"We must look at all options for protecting them for the
future."
In addition to his NCED and LSU affiliations, Twilley is the
recipient of an NSF rapid response oil spill grant.
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