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UW / Earth and Space Science / ESS 230 / Where is the original location that mississippi wants to move?

Where is the original location that mississippi wants to move?

Where is the original location that mississippi wants to move?

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“Stupid Human Tricks” mississippi river (aka delta alteration)We also discuss several other topics like Is moral reasoning related to moral behavior?

Background

  • Mississippi is prone to lobe switching due to meandering but humans are trying to keep the river in place
  • These levees and dams are preventing much sediment from replenishing the coast
  • The mississippi wants to move to the original location to the Atchafalaya river (previous delta river)
  • The river transports 200 million tons of sediment per year to the gulf of mexico (half of what it carried 300 years ago)
  • Large reservoirs on Missouri and Arkansas rivers account for the biggest loss of sediment
  • Deforestation and farming = more sediment sent down
  • “Controlled diversion” they are trying to send this excess sediment down the Atchafalaya river to control lobe switching
  • Another way humans control the river is through building canals

We also discuss several other topics like What explains the downward sloping demand curve for money?

Man Problem:

  • Louisiana’s coastline has been sinking
  • Marshes and barrier islands that have been protecting New Orleans from hurricanes, are eroding fast
  • Back when flooding occurred sediments / nutrients used to wash up on the shore, now due to levees and canals, that doest happen (just washes away)
  • This in turn, causes saltwater to move in, killing marsh plants (leaving nothing to hold the marsh together)
  • The sediment then compacts, sinks and erodes with nothing to replace it.

We also discuss several other topics like Is cutrate carpentry technically effecient? please justifies your answer.

Summary: dammed river (cut sediment supply in half), prevented lobe switching (eliminated sediment supply to other parts of delta plain), build artificial levees (reduced the nourishment to flood plain), constrained flow to modern

Balize delta (caused delta to build to shelf break and loose sediment to continental slope), removed water and natural gas(accelerated consolidation of deltaic sediment and subsidence of land surface), dredged channel (created depression that act as sediment traps and pathways for storm surge)We also discuss several other topics like What is the ancient greek of eco?

If you want to learn more check out The giant planets are mostly made up of what?
We also discuss several other topics like What is the difference between heterogeneous and homogenous mixture?

Puget Sound

“River Deltas”

Origin of the Puget sound and its Morphology

  • Began with a scour (flow under ice sheet) which formed a depression (later named Main Basin, Hood Canal, Lake WA)
  • Sedimentary deposits also raised land surface glacial tills, outwash deposits, lake deposits
  • The old glacial sediment now provided new input to the PS through cliff erosion, landslides, land surface erosion

Bathymetry (water depth) observations

  • Shallow entrance
  • The glacial origin is a moraine
  • The oceanographic name is a sill (sills separate into separate basins) parts of PS
  • The primary sill is Admiralty Inlet
  • The sinuous shape is a result of the origin (southern basin has 29% of shorelines)
  • The fluval (aka river) sediment supply fills PS form shoreline (Whidbey Basin has 43% of tidelands)
  • Several others divide PS into separate basins (>200m) - the main basin has 46% if water volume

Hydrography (water property) observations

  • Salinity (amount of salt dissolved in water)
  • River water 0 ppt
  • Ocean water ~ 35 ppt (depends on where in world)
  • Brackish water at depth in PS - 20-30 ppt

  • Density (low salinity = low density)
  • River plume flows over more dense dense brackish water (makes sense since less salinity means low density in river water)

  • Input of river water-varies with space and time
  • Northern PS supply the most
  • Small input during late summer
  • Large input during late autumn and winter rains and spring snow melt

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