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- W3082630363 endingPage "1254" @default.
- W3082630363 startingPage "1237" @default.
- W3082630363 abstract "Flow regulation by dams has led to profound changes to hydrologic, ecologic, and geomorphic systems with significant upstream and downstream effects. Although numerous metrics exist to represent the magnitude and direction of hydrologic alteration, these various measures paint a common picture of major global changes to hydrologic regimes following large-scale development of dams over the past five decades. In general, the dominant hydrologic response has been significant reductions in both flow magnitude and frequency as well as extensive changes in the timing and duration of flows. These hydrologic changes have led to a range of geomorphic responses. Major channel incision and bed armoring are frequently observed immediately downstream of dams due to sustained sediment-free releases. Dam distal effects are complex and more difficult to predict. However, recent research underscores the importance of considering tributary impacts, differential responses of gravel bed and sand bed systems, and having an appropriate time scale to better predict longitudinal impacts. Because of the pervasive sediment trapping by reservoirs, the global sediment delivery to oceans has been reduced by >∼26%, often leading to coastal erosion and beach loss. Current work suggests that in gravel bed rivers, channel responses to flow regulation and sediment trapping will require upwards of a century to establish new equilibrium profiles and channel widths, with the geomorphic effects of the dam attenuating progressively downstream as drainage area increases. With the proliferation of dam construction globally, especially in the Mekong and Amazon basins, there is tremendous concern that the existing local and global ecological and geomorphic effects will become increasingly more pronounced." @default.
- W3082630363 created "2020-09-08" @default.
- W3082630363 creator A5006941559 @default.
- W3082630363 creator A5043141986 @default.
- W3082630363 creator A5068671517 @default.
- W3082630363 date "2022-01-01" @default.
- W3082630363 modified "2023-09-29" @default.
- W3082630363 title "Flow Regulation by Dams: Ongoing and Emerging Trends" @default.
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