HR: 09:00h
AN: OS51A-05    [PDF]
TI: Numerical modeling of hyperpycnal flow generated by the discharge of Apennine Rivers
AU: Imran, J
EM: imran@engr.sc.edu
AF: Department of Civil and Environmental Engineering, University of South Carolina 300 Main Street, Columbia, SC 29208
AU: Khan, S M
EM: khansm@engr.sc.edu
AF: Department of Civil and Environmental Engineering, University of South Carolina 300 Main Street, Columbia, SC 29208
AU: * Syvitski, J P
EM: James.Syvitski@colorado.edu
AF: Institute of Arctic & Alpine Research Institute of Arctic & Alpine Research Institute of Arctic & Alpine Research Institute of Arctic & Alpine Research Institute of Arctic and Alpine Research, University of Colorado 1560 30th Street, Campus Box 450, Boulder, CO 80309-0450 AB: Under natural conditions, the Apennine Rivers are likely to develop hyperpycnal discharges; a few (i.e. 25 yr to 50 yr return interval floods) will last for greater than 24 hours, but many more events are likely to occur for shorter duration. Hyperpycnal flows may account for 20 to 40 % of the total sediment flux from these Apennine Rivers. These relatively small rivers transport on average between 0.4 and 1.3 MT/yr. A single hyperpycnal event, however, can transport between 0.3 and 4 MT in one day. Hyperpycnal flow generated at the mouth of `dirty' rivers carrying large concentration of silt and clay can have major impact on the continental strata formation. Here, we considered five Apennine Rivers (Chienti, Potenza, Pescara, Toronto, \& Metauro) for simulated hyperpycnal events and their impact on the sea floor morphology. We have used a 2-D depth-integrated finite volume model of density/turbidity current to study the spreading of hyperpycnal flow and the resulting deposition of sediment in the Adriatic. We used results from {\it Hytrotrend} model runs under pre and post dam scenario as input conditions in our simulation. It has been found that alongshore current can significantly impact the spreading and deposit pattern of a hyperpycnal flow. In addition, the effect of the variability of flood intensity on the deposit pattern is also studied.
DE: 3010 Gravity
DE: 3022 Marine sediments--processes and transport
DE: 3210 Modeling
DE: 4558 Sediment transport
SC: Ocean Sciences [OS]
MN: 2003 Fall Meeting