TY - GEN
T1 - COntrols on alluvial aggradation and degradation during the steady fall of relative sea level
T2 - 4th IAHR Symposium on River, Coastal and Estuarine Morphodynamics, RCEM 2005
AU - Swenson, J. B.
AU - Muto, T.
PY - 2006
Y1 - 2006
N2 - 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.
AB - 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.
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M3 - Conference contribution
AN - SCOPUS:84856979676
SN - 0415393760
SN - 9780415393768
T3 - River, Coastal and Estuarine Morphodynamics: RCEM 2005 - Proceedings of the 4th IAHR Symposium on River, Coastal and Estuarine Morphodynamics
SP - 675
EP - 684
BT - River, Coastal and Estuarine Morphodynamics
Y2 - 4 October 2005 through 7 October 2005
ER -