Abstract
To explore the relative importance of sediment supply, basin physiography, and the rate of sea level fall on fluviodeltaic systems, we develope morphodynamic model of fluviodeltaic progradation across a uniformly sloping and steadily subsiding shelf surface.The model,which couples a diffusive treatment of the alluvial long profile to a delta foreset of specified geometry, emphasizes the rigorous treatment of the alluvial-basement transition and the shoreline asmoving boundaries. Our analysis suggests that the intrinsic fluviodeltaic response to steady sea-level fall consists of an initial period of widespread alluvial aggradation and coastal onlap,followed by alluvial degradation and sustained coastal offlap.At zero order,the onset of degradation occurswhen the duration of sea-level fall exceeds a characteristic fluviodeltaic response time. Our study demonstrates that the transition from alluvial aggradation to degradation requires neither spatial nor temporal variation in the rate of sea-level fall.
Original language | English (US) |
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Title of host publication | River, Coastal and Estuarine Morphodynamics |
Subtitle of host publication | RCEM 2005 - Proceedings of the 4th IAHR Symposium on River, Coastal and Estuarine Morphodynamics |
Pages | 675-684 |
Number of pages | 10 |
Volume | 2 |
State | Published - Dec 1 2006 |
Event | 4th IAHR Symposium on River, Coastal and Estuarine Morphodynamics, RCEM 2005 - Urbana, IL, United States Duration: Oct 4 2005 → Oct 7 2005 |
Other
Other | 4th IAHR Symposium on River, Coastal and Estuarine Morphodynamics, RCEM 2005 |
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Country/Territory | United States |
City | Urbana, IL |
Period | 10/4/05 → 10/7/05 |