1/19/2016 Monitoring and Modeling a Reservoir Flush: Simulating - - PDF document

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1/19/2016 Monitoring and Modeling a Reservoir Flush: Simulating Sustainable Reservoir Management at Spencer Dam with an HEC RAS Unsteady Sediment Model and New Sediment Operational Rules Stanford Gibson, PhD (HEC) Paul Boyd, PhD, PE (NWO)

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Zombies Vampires

1/19/2016

Monitoring and Modeling a Reservoir Flush:

Simulating Sustainable Reservoir Management at Spencer Dam with an HEC‐RAS Unsteady Sediment Model and New Sediment Operational Rules

Stanford Gibson, PhD (HEC) Paul Boyd, PhD, PE (NWO) Thursday January 7, 2015: Noon (PST)

Google n‐gram Measures the relative occurrence of words in books over the last 200 years.

80 years

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Tuttle Reservoir, Kansas Lewis and Clark, Missouri River

Routing Flushing

NWO – With Paul Boyd PhD. NWK – With John Shelley PhD.

New Sediment Features in HEC‐RAS 5.0

Unsteady Sediment Transport and Reservoir Sediment Management Features

Quasi‐Unsteady Unsteady Sediment Funded by the Corps of Engineers Flood and Coastal Storm Damage Reduction R&D Program

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Lewis and Clark Tuttle Creek Sediment Flushing Model Routing Model

Gibson, S. and Boyd, P. (2014) “Modeling Long Term Alternatives for Sustainable Sediment Management Using Operational Sediment Transport Rules,” Reservoir Sedimentation –Scheiss et al. (eds), 229‐236. Shelley, J., Gibson, S., and Williams, A. (2015) “Unsteady Flow and Sediment Modeling in a Large Reservoir using HEC‐RAS 5.0,” Federal Interagency Sediment Conference, SedHyd Proceedings.

“Often the available field data are not sufficient to permit a formal calibration, but computational modeling is still the best method for analyzing the problem… The resulting studies are called computational analysis studies.”

‐Thomas and Chang

ASCE Manual of Practice 110

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Funded by the Regional Sediment Management R&D Program (RSM)

Spencer Dam Flushing Model

Spencer Dam on the Niobrara River

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The November 2015 Flush

t~5hrs vid

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Reservoir Stratigraphy

Coarse Sand and Gravel Cross Bedding Clay Seams Mud Flats Organic Flood Debris Layers Missouri Niobrara

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Qualitative Observations: Novel Bed Forms

Clay Rollers “Topographic” Bed Forms Periodic Antidunes ‐ 90 s cycle

HEC‐RAS Model and Calibration

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Survey and HEC‐geoRAS Model Spencer HEC‐RAS Model

400 600 800 1000 1200 1400 1600 1485 1490 1495 1500 1505 1510 Station (ft) Elevation (ft)

3 2

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Pre‐Flush Sediment Samples

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Sampling Bridge

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Post‐Flush Core Samples

USGS Concentration Measurements

Dam

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Downstream Concentration Calibration

Cumulative Volume Change (4 week run)

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Spencer HEC‐RAS Model

Lateral Processes Observed

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http://www.eng.buffalo.edu/glp/events/summer2008/week1/full/8‐GoodwinCreekDesign.pdf

USDA‐ARS Bank Failure and Toe Scour Model (BSTEM) in HEC‐RAS

Goodwin Creek Validation

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Deposition Model:

Measured and Computed Bed Change Between Fall and Spring Flushes

HEC‐RAS Modeling Alternatives:

Concentration Controlled Flushing

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Downstream Concentration Threshold

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HEC‐RAS Concentration Threshold Model

HEC‐RAS Modeling Alternatives:

Routing Qsed‐in=Qsed‐out

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International Sustainable Reservoir Management Initiatives

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Lower Mekong Basin

Kondolf, G.M., Rubin, Z.K, and Minear, J.T., (2014) “Dams on the Mekong: Cumulative sediment starvationWater Resources Research” Volume 50, Issue 6, pages 5158‐5169, 27 JUN 2014 DOI: 10.1002/2013WR014651

Laos Reservoir Sediment Workshops

Pictures From Paul Boyd (NWO)

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Laos Reservoir Sediment Workshops

Nam Ou 2 Model

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Nam Ou 2 Model Nam Ou 2 Model

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‐ ‐ ‐ ‐

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Ongoing HEC‐RAS Sediment Activities

Select Projects:

‐Islamabad Class and Tarbela Model ‐with Bill Doan and Mamie Brouwer ‐ USACE/USAID ‐Lower Missouri Sediment Model (500 miles)

with John Shelley NWK

‐Lower Mississippi Unsteady Sediment Model (DS of Old River)

with ERDC CHL: Ronnie Heath, Travis Dahl, Jim Lewis, Chris Nygaard

‐Muskegon River Coupled Ice‐Sediment Model ‐For Detroit District ‐ LRE ‐Falls Creek Sediment Flushing Model ‐with Chris Nygaard – NWP – For RSM

Features:

2D Sediment – With Alex Sanchez 1D Unsteady Finite Volume Method – RMA and RAS Team

Partners

Funding Partners:

Regional Sediment Management R&D Program (RSM) Flood and Coastal Storm Damage Reduction R&D Program Omaha District USGS

HEC‐RAS Team:

Gary Brunner, Mark Jensen, Steve Piper, Cam Ackerman, Alex Kennedy

District Partners:

Paul Boyd, PhD, PE – NWO John Shelley, PhD – NWK

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Niobrara River