Geology notes october 17 for exam 2

Geology notes october 17 for exam 2 - Delta switching...

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Sediment compaction is a normal part of delta behavior -Sediment compaction leads to surface subsidence -When New Orleans was laid out in 1718 it was at river level -Now some parts of New Orleans are 12 feet below river level Sea level rise contributes to land loss -Melting of glaciers has caused sea level to rise continuously over the past 10,000 years since the end of the Pleistocene. -Sea level has risen about 3.5 inches over the past century. Pumping of oil, gas, and water from the delta sediments causes the land surface to subside Tectonic downwarping is caused by sediment accumulation on the edge of the continent -The added weight causes the continental crust to slowly sink into the mantle. Reduced sedimentation is caused by dams on the Mississippi River and its tributaries that capture much of the sediment used to be transported to the delta.
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Unformatted text preview: Delta switching occurs in response to build up of sediments at the river mouth and the subsidence elsewhere.-New wetlands are formed by delta switching-Existing wetlands are built up by sediments deposited during floods.-These processes have been stopped by human intervention in the sedimentation process. Land subsidence and land loss increases flooding risk-Hurricane Katrina Parts of New Orleans that lie below the level of the Mississippi River and Lake Pontchartrain are at very high risk of flooding in spite of reconstructed levees. Glaciers are large bodies of ice that flow in response to their weight-Glaciers cause significant amounts of physical erosion and contain massive amounts of water...
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Geology notes october 17 for exam 2 - Delta switching...

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