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Sediment Dispersal Offshore Of Small Mountainous Rivers



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Sediment Dispersal Offshore Of Small Mountainous Rivers Insights from Numerical Models From source to sink triggers on the inner shelf Waiapu River 35MT Yr Courtney K Harris In collaboration with Aaron Bever Carl Friedrichs Tara Kniskern Julia Moriarty Yanxia Ma Jesse McNinch and Don Wright Waipaoa River 15MT Yr 25 ckharris vims edu 1 23 2011 1 Sediment delivery by small mountainous rivers Figure courtesy of JP Walsh ECU High sediment yields River mouth often exposed to oceanographic forces Flood plume might carry sediment directly to mid shelf depocenters non stop delivery Sediment delivery during significant events may overwhelm inner shelf cross shelf flux seems limited Sediment trapped deposited or somehow remains on inner shelf Eventually something triggers cross shelf flux gravity flow induced by waves or currents 1 23 2011 2 Sediment Transport Model Approach Three dimensional Include water column and sediment bed Coupled sediment transport and physical oceanographic models Account for Waves and currents Suspended transport Bed armoring Fluvial input Gravity flows Seabed 1 23 2011 Water Grid for ROMS SWAN Waipaoa shelf model under development by J Moriarty VIMS 3 OBJECTIVES Contrast delivery mechanisms for the nearshore and inner shelf of three small mountainous river systems the Eel Waiapu and Waipaoa Rivers Illustrate capabilities of event to seasonaltimescale three dimensional numerical models for evaluating sediment dispersal within the coastal zone of continental margins 1 23 2011 4 Eel River shelf Muddy deposits on mid shelf Flood plume delivers sediment to inner shelf Wave supported gravity flows deliver material to mid shelf Plan view of model Harris et al 2004 2005 1 23 2011 5 Cross shelf flux offshore of Eel River Sediment delivery to midshelf determined by wave energy Thickness of midshelf flood deposits function of wave energy Harris et al 2004 2005 1 23 2011 6 Waiapu River mid shelf deposit 210Pb from Kniskern et al 2010 Inner shelf storage Wadman



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