before human control natural rate of coastal progradation 4 m/y from 1000 b.c. to 1200a.d

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Before human control Natural rate of coastal progradation 4 m/y from 1000 B.C. to 1200A.D. Seven points of discharge described by Plinio il Vecchio

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Before human control Natural rate of coastal progradation 4 m/y from 1000 B.C. to 1200A.D. Seven points of discharge described by Plinio il Vecchio. The artificial form of the modern delta. abandonment of Po di Primaro 1152 AD a major natural avulsion - PowerPoint PPT Presentation

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Page 1: Before human control Natural rate of coastal progradation 4 m/y from 1000 B.C. to 1200A.D

Before human control

Natural rate of coastal progradation 4 m/y from 1000 B.C. to 1200A.D.

Seven points of discharge described by Plinio il Vecchio

Page 2: Before human control Natural rate of coastal progradation 4 m/y from 1000 B.C. to 1200A.D

abandonment of Po di Primaro 1152 AD a major natural avulsion northward shifting of distridutary channels Venice Republic is threatened by the

potential infilling of the lagoon

1604 AD digging of a diversionary canal (Taglio di porto Viro)

The artificial form of the modern delta

Page 3: Before human control Natural rate of coastal progradation 4 m/y from 1000 B.C. to 1200A.D

Po delta advanced in southeastern direction at 86m/y1750 AD-1820 AD Po di Goro and Donzella advanced at 129m/y19thcentury Po di Tolle was the dominant distributary at 60m/yEnd of 19th century natural tendency of the Po to shift its flow northward1886 AD-1992 AD Po della Pila dominated and advanced 47m/y

Taglio di porto Viro

Beach ridges

From Ciabatti, ‘66; Bondesan & Simeoni ‘83

Page 4: Before human control Natural rate of coastal progradation 4 m/y from 1000 B.C. to 1200A.D

River manipulation caused fast progradation and delta lobe switching

Rapid accumulation of a large amount of sediment caused by confining the Po discharge to a small area

The present delta is artificially held in position within context of the northern Adriatic oceanographic processes

Natural and artificial subsidence are enhanced by levee construction, which prevents overbank sedimentation

River-bed excavation and river damming in the drainage basin during the last 50 years led to a marked decrease in sediment supply

Result of human changes to Po River mouth

Page 5: Before human control Natural rate of coastal progradation 4 m/y from 1000 B.C. to 1200A.D

October 2000 flood

Despite the best intentions of humans...

Page 6: Before human control Natural rate of coastal progradation 4 m/y from 1000 B.C. to 1200A.D

An American

Fiasco

Loss of wetlands near mouth of Mississippi River has caused shrinkage of land surface and loss of protection for interior areas, including New Orleans

Page 7: Before human control Natural rate of coastal progradation 4 m/y from 1000 B.C. to 1200A.D

List of some things we did

Dammed river – reduced sediment supply, 400 million t/y to 200 t/y

Built artificial levees – reduced nourishment of flood plain

Constrained flow to modern Balize delta – caused delta to build to shelf break, and lose sediment to continental slope

Prevented lobe switching – eliminated sediment supply to other parts of delta plain

Removed water and natural gas – accelerated consolidation of deltaic sediment and subsidence of land surface

Dredged channel – created depressions that act as sediment traps

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