Motivation for Research and Objectives
Louisiana contains approximately 40% of the coastal wetlands of the lower forty-eight states. Louisiana has lost up to forty square miles of marsh per year for several decades (accounting for 80% of the nation’s annual coastal wetland loss) (lacoast.gov). From a hydrologic standpoint, the wetlands replenish aquifers, hold excess floodwaters from intense rainfalls, and provide storm surge protection.
The Nation also benefits from Louisiana’s coastal lands. Louisiana is responsible for a major part of our nation’s oil and gas production, shipping commerce, fisheries industry, fur harvesting, and oyster production, accounting for over 55,000 jobs and billions of dollars in revenues. Additionally, wetlands are wonderful recreational resources and are part of Louisiana’s growing ecotourism business (http://www.lacoast.gov/new/About/Default.aspx?utm_source=twitterfeed&utm_medium=twitter).
The effects of erosion and loss of marsh land in the Southern United States has devastating consequences to all of these benefits, both local and national. The loss of land can mostly be attributed to subsidence, erosion, and severe weather events. The USGS reports that a total of 118 square miles of land has been transformed to new water areas in a 9,742 square mile area from the Chandeleur Islands to the Atchafalaya River. This land loss is from fall of 2004 to the fall of 2005, after Hurricanes Katrina and Rita (USGS, February 2006).
Today, with our understanding of how fragile the coastal areas are, there are many study and restoration projects underway. Since the implementation of the Coastal Wetlands Planning, Protection, and Restoration Act (CWPPRA) in 1990, there have been 151 coastal restorat...
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...aused resuspension in some tests. This is not detrimental to the understanding the resuspension characteristics of the sample, or being able to use that data for stress plots. However, it would be preferable to have stresses below observable resuspension levels.
Differences from Lick’s experiments with the shaker and these experiments:
A sampling port for measurement of the sediment concentration was located at 12.7 cm (5 in) from the bottom of the cylinder.
For purposes of reducing biological activity, Lick covered the sample cores, as well as, kept the cores in a dark chamber.
Before running the test, the depth of the overlaying water inside each core was adjusted to 12.7 cm (5 in). The grid was also adjusted such that the lower surface was 5.08 cm (2 in) above the sediment surface (the grid oscillated between 5.08 and 7.62 cm above the interface).
Case Study of Hastings Coastal Management Hastings is a town on the south coast of England approximately 60 miles south of London (see map below). In recent years, the coastline at Hastings has had to face many large scale problems, including the 10 km stretch from Hastings eastwards to the small town of Fairlight. With the coastline at constant exposure to the English Channel, there are many coastal processes which take place along the stretch of beach and cliff. [IMAGE][IMAGE] [IMAGE][IMAGE] Longshore Drift [IMAGE] Fetch [IMAGE]The map on the left illustrates the location of Hastings and also the area of the coastline which is being discussed in this case study.
Gabrysh, R. K. "Land surface subsidence in the Houston-Galveston region." IASH Publ. (1969): pp. 43-44.
I live in Houma, Louisiana so I have tons of experience with the bayou region of South Louisiana. Everywhere I look in Houma there is a bayou, which is a good and bad thing. With a bayou comes many great things such as Egrets, Spanish Moss, etc. The bad thing about seeing many bayous is that it is a constant reminder that one day, Houma might be a part of the Gulf of Mexico. Also my dad’s side of the family is from Chauvin and Golden Meadow which is not too far from where the real damage of eroding wetlands is. I go down to Chauvin sometimes to visit my Nanny and her husband. I always see houses on stilts because of possible flooding that could come if a hurricane passes through. One of the issues that Mike Tidwell caught my interest was that the wildlife in bayous will one day be diminished into smaller numbers. That is because the eroding land causes brown shrimp, crabs, and other seafood to die out. Many residents in South Louisiana make a living off of seafood so to have most of that industry die out will hurt the economy of South Louisiana. I just found this issue very interesting.
Fifty percent of the original wetlands doesn’t even exist today. The water supply in the Everglades is changing and that has affected the Everglades in many ways. For one, population is decreasing and mankind needs to restore it somehow. Next, the Everglades are in need of some money to do that restoration, but where will they get it from? Last, the water supply is poisoning the humanity around it with much bacteria and many bad and dangerous elements. The Everglades water supply affected it in fixing the Everglades and wildlife.
... consider some ideas of what can be done to further enhance the management of the coastal issue. Using the research action plan, I aim to acquire a sophisticated understanding of longshore drift, coastal management and implementations of coastal issues, through the research action plan. Most importantly, I will include various diagrams explaining how the process of longshore drift occurs and what implementations it has on coastal environments, accompanied by an explanation of how the issue is being managed, a detailed outline of the geographical processes involved and a discussion of the impacts of the issue and why it is important.
Geologically speaking, Louisiana is a very young state. Environmentally speaking, Louisiana is a very fragile state. Louisiana has always been dependent upon the nutrient rich deposits from the Mississippi River to build up the land. Centuries ago the Mississippi River periodically changed its course, building up Louisiana one delta at a time. The erosional forces of the Gulf of Mexico and annual hurricanes depleted Louisiana’s coastline, but the mighty Mississippi River would replenish the land losses. Such is the relationship that forces of nature have with one another. Place mankind in the mix, and the relationship becomes stressed and dysfunctional. The present day Louisiana coastline is a mere shadow of its former self. Let’s look at how Louisiana came to its current demise and what is being done to rectify the situation.
For many years now scientists and researchers have been paying their attention to the bay. Millions of dollars and hundreds of hours have been spent to return the bay to its glory. However, with all that has been done the bay is still in danger and the work is no where near complete. In 2005 the bay's health was evaluated at a “D”. (Chesapeake Bay Restoration)
This is a result from the new levee system. This system prevents the natural ways of sediment re-depositing along the riverbank and wetlands. The levees lead the sediment to deposit off the continental shelf in the Gulf of Mexico. (15) This adds to the loss of wetlands along the coast. Wetlands are important to the economy in more than one way. They serve as homes for fish which fishermen catch then sell and they protect the mainland from getting the full effect of storm surge during a hurricane. “Every 2.7 miles of wetlands absorbs one foot of storm surge” (1.2). Without wetlands and barrier islands working as a barrier, the mainland could experience even more damage during
According to Hurricane Katrina At Issue Disasters, economic damages from Hurricane Katrina have been estimated at more than $200 billion… More than a million people were displaced by the storm… An estimated 120,000 homes were abandoned and will probably be destroyed in Louisiana alone (At * Issue). For this perspective, “Hurricane Katrina change the Gulf Coast landscape and face of its culture when it hit in 2005” (Rushton). A disaster like Katrina is something the victims are always going to remember, for the ones the lost everything including their love ones. Katrina became a nightmare for all the people that were surround in the contaminated waters in the city of New Orleans. People were waiting to be rescue for days,
The Everglades, classified as a wetland or a "transition zone" can support plant and animal life unlike any other place. Wetlands are an important resource for endangered species and "that more than one third of the United States' threatened and endangered species live only in wetlands." Says Elaine Mao, the author of Wetlands and Habitat Loss. People have started to notice the importance and the role of wetlands like the Everglades and how they are valuable and essential for ecosystems to live. Wetlands provide so many kinds of plants, mammals, reptiles, birds, and
The Atchafalaya is a unique River among Louisiana Basins because it has a growing Delta system with stable wetlands. It is best known for its swamps, at 260,000 acres, this block of forest represents the largest remaining tract of Coastal Cypress in the United States. The Atchafalaya Basin, it surrounds
...s are considered as part of a larger watershed, the recognization of the complexity of environmental stresses can be understood. Management plans can be developed to reduce impacts to mangroves, seagrasses and the reef ecosystem, based upon accurate data and a better understanding of the system. EPA is in the process of developing guidance for a watershed approach to coral ecosystem protection.
Florida became a state in 1845 and almost immediately people began proposing to drain the Everglades. In 1848, a government report said that draining the Everglades would be easy, and there would be no bad effect. Canals and dams were dug to control seasonal flooding. Farmers grew vegetables in the rich soil of the drained land, Ranchers had their cattle graze on the dry land, and new railways lines were constructed to connect communities throughout south Florida; but the ecosystem of the Everglades was not suited for either farming or ranching. The natural cycle of dry and wet seasons brought a devastating series of droughts and floods. These had always been a p...
Globally coastal wetlands are disappearing at an alarming rate, the problem is most of society does not realize the value of these precious wetlands. Coastal wetlands provide an important role in the coastal ecosystem. “Coastal wetlands provide critical services such as absorbing energy from coastal storms, preserving shorelines, protecting human populations and infrastructure, supporting commercial seafood harvests, absorbing pollutants and serving as critical habitat for migratory bird populations”(Anonymous, 2011). Coastal wetlands are an economical asset as well as an environmental one.
...th of the levees shortly after Katrina, and millions of dollars have been spent on coastal restoration programs. Plenty of people from around the world helped take care of those affected by this horrible storm and help reconstruct the damaged places.