Downstream ecological effects of dams: A geomorphic perspective
- EA Engineering, Science, and Technology, Lafayette, CA (United States)
- Univ. of California, Berkeley, CA (United States)
- Humboldt State Univ., Arcata, CA (United States)
The damming of a river changes the flow of water, sediment, nutrients, energy, and biota, interrupting and altering most of a river`s ecological processes. This article discusses the importance of geomorphological analysis in river conservation and management. To illustrate how subtle geomorphological adjustments may profoundly influence the ecological relationships downstream from dames, three case studies are presented. Then a geomorphically based approach for assessing and possibly mitigating some of the environmental effects of dams by tailoring dam designed and operation is outlined. The cases are as follows: channel simplification and salmon decline on the McKenzie River in Oregon; Channel incision and reduced floodplain inundation on the Oconee river in Georgia; Increased stability of a braided river in New Zealand`s south island. 41 refs., 10 figs., 1 tab.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 41822
- Journal Information:
- Bioscience, Journal Name: Bioscience Journal Issue: 3 Vol. 45; ISSN 0006-3568; ISSN BISNAS
- Country of Publication:
- United States
- Language:
- English
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