Channel Evolution of Sandy Reservoir Sediments Following Low-Head Dam Removal, Ottawa River, Northwestern Ohio, U.S.A.

Nathan Harris, James E. Evans

Department of Geology, Bowling Green State University, Bowling Green, USA.
Department of Geology, Bowling Green State University, Bowling Green, USA;Pennsylvania General Energy Company, Warren, USA.

DOI: 10.4236/ojmh.2014.42004                

Abstract

Dozens of low-head dams are removed annually for reasons of obsolescence, financial liability, public safety, or as part of aquatic ecosystem restoration. Prior to removing a dam, hydrologic and sedimentologic studies are used to predict channel changes that would occur after the proposed dam removal. One commonly used predictive approach is a channel evolution model (CEM). However, most CEMs assume that the reservoir has trapped cohesive silts and muds. This study looks at the effects of low-head dam removal on a reservoir in filled with sand-rich sediment. The Secor Dam (2.5 m tall, 17 m wide) was constructed on the Ottawa River in northwestern Ohio (USA) during 1928 and was removed in 2007. High resolution channel cross-sections were measured at 17 locations prior to dam removal and re-measured every approximately 30 days for 6 months following the removal. Sediment sampling, sediment traps, substrate sampling, differential GPS tracking of channel bed forms and sediment coring were also used to characterize the channel sediment response to dam removal. Breaching of the dam produced a diffuse nickzone which was the width of the channel and about 10 m in length. One initial response was downstream migration of a sediment wave at rates up to 0.5 m/hr. The overall effect was erosion of the former reservoir to a distance of 150 m upstream of the former dam. Portions of the former reservoir were incised >1 m. Within the first 6 months after removal, approximately 800 m³ of sand had been mobilized from the former reservoir, transported downstream past the former dam, and had primarily in-filled pre-existing pools within a reach approximately 150 m downstream of the former dam. This behavior significantly differs from the predicted results of current CEMs which anticipate a first flush of suspended sediment and minor deposition of bed load materials in the channel downstream of the former dam.

Keywords

Dams; Reservoir Sediment; Dam Removals; Channel Evolution Model (CEM)

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	U.S. Army Corps of Engineers (2013) National Inventory of Dams.
[2]	Evans, J.E., Mackey, S.D., Gottgens, J.F. and Gill, W.M. (2000) Lessons from a Dam Failure. Ohio Journal of Science, 100, 121-131.
[3]	Evans, J.E. (2007) Sediment Impacts of the 1994 Failure of IVEX Dam (Chagrin River, NE Ohio): A Test of Channel Evolution Models. Journal of Great Lakes Research, 33, 90-102.
[4]	Roberts, S.J., Gottgens, J.F., Spongberg, A.L., Evans, J.E. and Levine, N.S. (2007) Assessing Potential Removal of Low-Head Dams in Urban Settings: An Example from the Ottawa River, NW Ohio. Environmental Management, 39, 113-124. http://dx.doi.org/10.1007/s00267-005-0091-8
[5]	Evans, J.E., Harris, N. and Webb, L.D. (2013) The Shortcomings of “Passive” Urban River Restoration after low-Head Dam Removal, Ottawa River (northwestern Ohio, U.S.A.): What the Sedimentary Record Can Teach Us. In: DeGraff, J.V. and Evans, J.E., Eds., The Challenges of Dam Removal and River Restoration, Geological Society of America, Reviews in Engineering Geology, 21, 161-182. http://dx.doi.org/10.1130/2013.4121(13)
[6]	Rumschlag, J.H. and Peck, J.A. (2007) Short-Term Sediment and Morphologic Response of the Middle Cuyahoga River to the Removal of the Monroe Falls Dam, Summit County, Ohio. Journal of Great Lakes Research, 33, 142-153.
[7]	Peck, J.A. and Kasper, N.R. (2013) Multiyear Assessment of the Sedimentological Impacts of the Removal of the Munroe Falls Dam on the Middle Cuyahoga River, Ohio. In: DeGraff, J.V. and Evans, J.E., Eds., The Challenges of Dam Removal and River Restoration, Geological Society of America, Reviews in Engineering Geology, 21, 81-92. http://dx.doi.org/10.1130/2013.4121(07)
[8]	Evans, J.E., Huxley, J.M. and Vincent, R.K. (2007) Upstream Channel Changes Following Dam Construction and Removal Using a GIS/Remote Sensing Approach. Journal of the American Water Resources Association, 43, 683-697. http://dx.doi.org/10.1111/j.1752-1688.2007.00055.x
[9]	Krieger, K.A. and Zawiski, B. (2013) Changes in Biotic and Habitat Indices in Response to Dam Removals in Ohio. In: DeGraff, J.V. and Evans, J.E., Eds., The Challenges of Dam Removal and River Restoration, Geological Society of America, Reviews in Engineering Geology, 21, 105-116. http://dx.doi.org/10.1130/2013.4121(09)
[10]	Ritter, J., Shaw, K., Evelsizor, A., Minter, K., Rigsby, C. and Shearer, K. (2013) Assessing Stream Restoration Potential of Recreational Enhancements on an Urban Stream, Springfield, Ohio. In: DeGraff, J.V. and Evans, J.E., Eds., The Challenges of Dam Removal and River Restoration, Geological Society of America, Reviews in Engineering Geology, 21, 133-148. http://dx.doi.org/10.1130/2013.4121(11)
[11]	Evans, J.E., Levine, N.S., Roberts, S.J., Gottgens, J.F. and Newman, D.M. (2002) Assessment Using GIS and Sediment Routing of the Proposed Removal of Ballville Dam, Sandusky River, Ohio. Journal of the American Water Resources Association, 38, 1549-1565. http://dx.doi.org/10.1111/j.1752-1688.2002.tb04364.x
[12]	Evans, J.E. and Gottgens, J.F. (2007) Contaminant Stratigraphy of the Ballville Reservoir, Sandusky River, NW Ohio: Implications for Dam Removal. Journal of Great Lakes Research, 33, 182-193.
[13]	Simons, R.K. and Simons, D.B. (1991) Sediment Problems Associated with Dam Removal—Muskegon River, Michigan. In: Shane, R.M., Ed., Proceedings of the National Conference of the American Society of Civil Engineers, New York, 680-685.
[14]	Wohl, E.E. and Cenderelli, D.A. (2000) Sediment Deposition and Transport Patterns Following a Reservoir Sediment Release. Water Resources Research, 36, 319-333. http://dx.doi.org/10.1029/1999WR900272
[15]	Lisle, T.E., Cui, Y., Parker, G., Pizzuto, J.E. and Dodd, A.M. (2001) The Dominance of Dispersion in the Evolution of Bed-Material Waves in Gravel-Bedded Rivers. Earth Surface Processes and Landforms, 26, 1409-1420. http://dx.doi.org/10.1002/esp.300
[16]	Pizzuto, J.E. (2002) Effects of Dam Removal on River Form and Process. BioScience, 52, 683-691. http://dx.doi.org/10.1641/0006-3568(2002)052[0683:EODROR]2.0.CO;2
[17]	Cui, Y. and Parker, G. (2005) Numerical Model of Sediment Pulses and Sediment-Supply Disturbance in Mountain Rivers. Journal of Hydraulic Engineering, 131, 646. http://dx.doi.org/10.1061/(ASCE)0733-9429(2005)131:8(646)
[18]	Doyle, M.W., Stanley, E.H. and Harbor, J.M. (2002) Geomorphic Analogies for Assessing Probable Response to Dam Removal. Journal of the American Water Resources Association, 38, 1567-1579. http://dx.doi.org/10.1111/j.1752-1688.2002.tb04365.x
[19]	Doyle, M.W., Stanley, E.H. and Harbor, J.M. (2003) Channel Adjustments Following Two Dam Removals in Wisconsin. Water Resources Research, 39, 1-15. http://dx.doi.org/10.1029/2002WR001714
[20]	Simon, A. and Hupp, C.R. (1986) Channel Evolution in Modified Tennessee Channels. Proceedings of the 4th Federal Interagency Sedimentation Conference, 2, 5.71-5.82.
[21]	Harris, N. (2008) Sedimentological Response of the 2007 Removal of a Low-Head Dam, Ottawa River, Toledo, Ohio. M.S. Thesis, Bowling Green State University, Bowling Green, 228.
[22]	Baker, D.B., Richards, R.P., Lofus, T.T. and Kramer, J.W. (2004) A New Flashiness Index: Characteristics and Applications to Midwestern Rivers and Streams. Journal of the American Water Resources Association, 40, 503-522. http://dx.doi.org/10.1111/j.1752-1688.2004.tb01046.x
[23]	Webb, L.D. (2010) Historical Changes in the Geomorphology of the Ottawa River (NW Ohio, U.S.A.) Due to Urbanization and Land Clearance. M.S. Thesis, Bowling Green State University, Bowling Green, 169.
[24]	Cui, Y., Parker, G., Braudrick, C., Dietrich, W.E. and Cluer, B. (2006) Dam Removal Express Models (DREAM): Part I. Model Development and Validation. Journal of Hydraulic Research, 44, 291-307.
[25]	Persico, L.P. and Meyer, G. (2013) Beaver, Climate, and Scale Effects on Late Holocene Stream Behavior in Northern Yellowstone National Park. Geological Society of America, Abstracts with Programs, 45, 41.