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Geomorphic Responses to Dam Removal in the United States – a Two-Decade Perspective

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2017, Geomorphic Responses to Dam Removal in the United States – a Two-Decade Perspective: .

Summary

Recent decades have seen a marked increase in the number of dams removed in the United States. Investigations following a number of removals are beginning to inform how, and how fast, rivers and their ecosystems respond to released sediment. Though only a few tens of studies detail physical responses to removals, common findings have begun to emerge. They include: (1) Rivers are resilient and respond quickly to dam removals, especially when removals are sudden rather than prolonged. Rivers can swiftly evacuate large fractions of reservoir sediment (≥50% within one year), especially when sediment is coarse grained (sand and gravel). The channel downstream typically takes months to years--not decades--to achieve a degree of stability [...]

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Map of United States showing the number of dams in each state catalogued by the US Army Corps of Engineers (2013).JPG
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Map of United States showing the number of dams in each state catalogued by the
Map of United States showing the number of dams in each state catalogued by the

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  • John Wesley Powell Center for Analysis and Synthesis

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DOI https://www.sciencebase.gov/vocab/category/item/identifier 10.1002/9781118971437.ch13

Citation Extension

noteMajor, J.J., East, A.E., O'Connor, J.E., Grant, G.E. Wilcox, A.C., Magirl, C.S., Collins, M.J., Tullos, D.D., 2017, Geomorphic responses to dam removal in the United States—a two-decade perspective, in Tsutsumi, D. and Laronne, J.B., editors, Gravel-Bed Rivers: Processes and Disasters. John Wiley and Sons, p. 355-383.

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