Geomorphic Effects of Dams on Rivers Gordon Grant.

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Presentation transcript:

Geomorphic Effects of Dams on Rivers Gordon Grant

Hydrologic Regime  The hydrologic “regime” Geology Geology Climate Climate Topography Topography  Changes in flow (Q) due to manipulation Direct = dams, diversions Direct = dams, diversions Indirect = climate shift, forest practices Indirect = climate shift, forest practices  Flows are influenced in magnitude, duration, frequency and time There are consequences for manipulation There are consequences for manipulation

Hydrograph – McKenzie River, OR Flood control dams

Summary  Dams alter… Sediment regime Sediment regime Hydrologic regime Hydrologic regime River morphology River morphology