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USGS CMG InfoBank: Transporting Sediment Around Dams

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Comment: 19:38 - 20:32 (00:54)
Source: Annenberg/CPB Resources - Earth Revealed 24, Waves, Beaches and Coasts
Keywords: "Scott Jenkins", "Scripps Institution of Oceanography", "Scripps Center for Coastal Studies", transportation, sediment, dam, beach, erosion, technology, season, "Southern California", lake, sand, foreshore, delta, "lake level", stream

Our transcription: Jenkins contends that doing a better job of transporting sediment around dams would be an important long-term solution to the problem of beach erosion.
Basically it's an earth-moving problem, and we already have a very well developed technology in earth moving.
Now, in Southern California and in many other areas as well, there are seasonal fluctuations in the lake level.
Typically the lake levels are low in the summer, but whatever season they're low, earth moving equipment can come in and excavate these sands from the dry foreshore area.
The foreshore deltas in these reservoirs contain most of the beach-sized sand.
These will be high and dry when the lake levels are low.
So they can be collected with standard earth moving equipment and either trucked directly to the beach or reintroduced to the streambeds downstream of the dam.

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