1. Introduction
The geological significance of the Mississippi Delta cannot be underestimated. This interaction between the land, the rivers, and the Gulf of Mexico is what their environment is all about; a story that illuminates myriad consequences of progress, throws the origins and uses of sediment into sharp relief, and clearly elucidates the ideas of subsidence, land loss, and the behavioral patterns of local communities. Maps of forest land and marsh on Coastal Management Programs usually display the Mississippi Delta Region separately from the state of Louisiana, the Delta Province, and northward. Erosion and advancement of these lands easily puts before us the Delta parishes or the teaching legacies of the Mississippi River. Segments of that land mass above sea level at any given time are built from the river’s huge sediment input. As the miles of its transport length are exceeded, the river reclaims its land, widens, and raises its bed elevation. Active land building occurs prior to the main flow break, within a fan-like course.
The Mississippi Delta peninsula, extending 200 miles (321 km) from Memphis to the Gulf of Mexico, may be the most productive sedimentary landscape in the world. The Mississippi River contributes 7×10^5 tons (mineral base) annually to its deposit of 2×10^8 cubic yards, the equivalent volume of almost 2500 Great Pyramids of Giza. Alluvial and deltaic clays, sands, and silts were laid down in beds tens of feet thick between each advancing river lobe and the Gulf of Cabahossee, Mississippi Sound, and Mobile Bay. While eventually as much as 6×10^9 tons of sediment during twentieth-century high discharge proceeds to the greater Gulf depositional pool. Much of the coast is marshland. This dynamic natural behavior has provided six agriculturally rich parishes, sizable businesses, harbors in New Orleans and Baton Rouge, the asphalt deposits at Ragley’s Capitol Hill, and an abundance of small-town folk who are discovering locally that what’s going on out there is vital to their well-being.
2. Geology of the Mississippi Delta
3. Formation of the Mississippi Delta
4. Land Subsidence in the Mississippi Delta
5. Causes of Land Subsidence
6. Impact of Land Subsidence on the Delta
7. Efforts to Mitigate Land Subsidence
8. Engineering Solutions for Land Subsidence
9. Environmental Consequences of Land Subsidence
10. Economic Implications of Land Subsidence
11. Future Challenges and Potential Solutions
12. Conclusion
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