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| The Zen of Flowers and Refineries, by Raina Benoit. Lafayette, Louisiana. |
To get a handle on the
disappearing of Louisiana, I need to educate myself on water words. Unless quoted by an attributed source, everything below is based on my (flawed) understanding of water terms.
Wetlands
1. "Wetlands" is the parent category for these subcategories:
(there are more, but I'm trying to keep it simple)
2.
Wetland
An area that is inundated or saturated by surface or groundwater at a
frequency and duration to support ... a prevalence of vegetation typically adapted
for life in saturated soil conditions
3.
Swamp
a wetland that is forested ... Many swamps occur along large rivers where they are critically dependent upon natural water level fluctuations. Other swamps occur on the shores of large lakes. [I added the boldface for emphasis.]
4.
Marsh
A type of wetland that is dominated by herbaceous rather than woody plant species ...
Marshes can often be found at the edges of lakes and streams, where they form a transition between the aquatic and terrestrial ecosystems. They are often dominated by grasses, rushes or reeds
Wetlands are important because they:
- Help mitigate the effects of river flooding and hurricane-led coastal surges
- Protect water quality by trapping contaminants on the wetlands floor
- Protect shorelines from erosion
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| Cypress swamp, Natchez Trace, Mississippi. |
Bayou
A bayou is a slow-moving creek or a swampy
section of a river or a lake. They are usually found in flat areas
where water collects in pools. Bayous are often associated with the
southeastern part of the United States.
Bayous are usually
shallow and sometimes heavily wooded. They can be freshwater, saltwater,
or a combination of both. This combination is called "brackish water." Source: National Geographic Education
The
Bayou Teche may be south Louisiana's most prominent bayou. Thousands of years ago, it was the main channel (see below) of the Mississippi River. Bayou Teche is 125 miles long and feeds into the Atchafalya River.
Tributaries v. distributaries
- A tributary is a freshwater stream that feeds into a larger stream or river.
- A distributary is a stream that branches off and flows apart from the mainstem of a stream or river.
Source:
National Geographic Education
Another description:
Rivers are connected together in vast networks of tributaries, which
feed water into the main river channel, and distributaries, which pull
water out of the main channel.
Channel
The channel isn't the water; it is the container of the water - the bottom and sides of the river, for example. The banks of a river are part of the channel.
The above is a neutral definition of a channel. Some channels are man-made. Canals and ditches are man-made channels.
A man-made channel is a double-edged sword. It can control the passage of water and can prevent some floods. On the other hand, water moves through a man-made channel faster (thus stronger) than a natural channel. Consequently, when water does top the channel banks, it is a more dangerous flood because its force is stronger than it would have been in a natural channel. And if there are no wetlands to absorb the brunt of the flood, there is more erosion, more property damage, more loss of life.
A movie short
Below is a five-minute video by Kael Alford called
Bottom of 'da Boot: Louisiana's Disappearing Coast:
Related posts
Disappearing Louisiana, Part 1: Stumbling on History
Disappearing Louisiana, Part 2: Water Words
Disappearing Louisiana, Part 3: Paradise Faded: The Fight for Louisiana
Disappearing Louisiana, Part 4: Revetments, Rip-rap, and Other Exotica
Disappearing Louisiana, Part 5: The Control of Nature: Atchafalaya
