[Faculty] Fwd: [CSRC-SDSU COLLOQUIUM]: Quantifying Impact of Climate Change on Reservoir Sedimentation

[Jose Castillo]

*DATE:* Friday, October 11th, 2013

*TITLE:* Quantifying Impact of Climate Change on Reservoir Sedimentation

*TIME:*  3:30 PM

*LOCATION: * GMCS 214

*SPEAKER:*  Dr. Svetlana Kostic. San Diego State University

Researchers predict that climate-fueled extreme weather events will
continue to put many communities worldwide at increased risk for
devastation from floods. FEMA estimates that areas at risk of flooding in
the US would increase 45 percent by 2100, mainly due to climate change. A
comprehensive numerical model of reservoir sedimentation is developed and
used to assess the impact of flooding on reservoir performance. The model
captures: a) the formation and evolution of the river-delta and associated
deposits, and b) the morphodynamic effects of a dam at the downstream end
of the reservoir. The outflow boundary condition is selected to emulate the
release of flow over an uncontrolled or open-gate controlled spillway. The
turbidity current is thus not allowed to vent until the underflow-clear
water interface rises above the elevation of the overflow point. The model
allows for a smooth and continuous progression from a stagnation to an
overflow condition, which is a serious computational challenge. Two types
of flood events are analyzed. First, a short, single-event turbidity
current entering a reservoir is considered to demonstrate that the model
reproduces, for the first time, all stages of the turbidity current
propagation and interaction with the dam, including: a) the expansion of
the current toward the dam; b) the runup against the face of the dam; c)
the formation of an upstream-migrating bore as the current reflects off the
dam; and d) the establishment of an internal hydraulic jump. Next, a series
of sustained turbidity current events entering a reservoir are simulated to
capture the loss of reservoir storage capacity in time due to continuous
growth of the bottomset deposit and its interaction with the fluvial delta.
In the future, the model will be expanded into a valuable tool for
evaluating sediment routing, flushing and other operational procedures in
reservoirs that can be used as effective climate change mitigation
strategies.

*HOST:*  Dr. Jose Castillo

For future events, please visit our website at:

http://www.csrc.sdsu.edu/colloquium.html



-- 

Jose E. Castillo  Ph.D.

Director / Professor

Computational Science Research Center

5500 Campanile Dr

San Diego State University

San Diego CA 92182-1245

619 5947205/3430, Fax 619-594-2459

 http://www.csrc.sdsu.edu/mimetic-book/

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