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A preliminary report released on November 2, 2005, carried out by independent investigators from the University of California, Berkeley and the American Society of Civil Engineers (ASCE) stated that many New Orleans levee and flood wall failures occurred at weak-link junctions where different levee or wall sections joined together.
Example of land loss in coastal Louisiana between 1932 and 2011; detail of Port Fourchon area. Coastal erosion in Louisiana is the process of steady depletion of wetlands along the state's coastline in marshes, swamps, and barrier islands, particularly affecting the alluvial basin surrounding the mouth of the Mississippi River.
The process is often a result of a sudden fall in sea level or the rise of land. The disturbance enables a rise in the river's gravitational potential energy change per unit distance, increasing its riverbed erosion rate. The erosion occurs as a result of the river adjusting to its new base level. [1]
The Universal Soil Loss Equation (USLE) is a widely used mathematical model that describes soil erosion processes. [1]Erosion models play critical roles in soil and water resource conservation and nonpoint source pollution assessments, including: sediment load assessment and inventory, conservation planning and design for sediment control, and for the advancement of scientific understanding.
The side of a levee in Sacramento, California. A levee (/ ˈ l ɛ v i / or / ˈ l ɛ v eɪ /), [a] [1] dike (American English), dyke (British English; see spelling differences), embankment, floodbank, or stop bank is an elevated ridge, natural or artificial, alongside the banks of a river, often intended to protect against flooding of the area adjoining the river.
Cut bank – Outside bank of a water channel, which is continually undergoing erosion; Crevasse splay – Sediment deposited on a floodplain by a stream which breaks its levees; Drainage basin – Land area where water converges to a common outlet (watershed) Esker – Long, winding ridge of stratified sand and gravel associated with former ...
Crevasse splay on the Columbia River ().1ː Levees; 2ː active channel; 3ː floodplain; 4ː crevasse splay deposits; 5ː crevasse splay extent. A crevasse splay is a sedimentary fluvial deposit which forms when a stream breaks its natural or artificial levees and deposits sediment on a floodplain.
Stream capture by headward erosion, leaving a wind gap. Stream capture, river capture, river piracy or stream piracy is a geomorphological phenomenon occurring when a stream or river drainage system or watershed is diverted from its own bed, and flows down to the bed of a neighbouring stream.