Usoi Dam Wave Overtopping and Flood Routing in the Bartang and Panj Rivers, Tajikistan |
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Authors: | John C Risley Joseph S Walder Roger P Denlinger |
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Institution: | (1) U.S. Geological Survey, Oregon District, 10615 SE Cherry Blossom Drive, Portland, Oregon 97216, USA;(2) U.S. Geological Survey, Cascades Volcano Observatory, 1300 SE Cardinal Court, Bdg. 10, Suite 100, Vancouver, Washington 98683, USA |
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Abstract: | The Usoi dam was created in the winter of 1911 after an enormous seismogenic rock slide completely blocked the valley of the
Bartang River in the Pamir Mountains of southeastern Tajikistan. At present the dam impounds 17 million cubic meters of water
in Lake Sarez. Flood volume and discharge estimates were made for several landslide generated floods that could overtop the
dam. For landslide volumes of 200, 500, and 1,000 million cubic meters, estimated overtopping flood volumes were 2, 22, and
87 million cubic meters of water, respectively. Estimated peak discharge at the dam for these three flood scenarios were 57,000,
490,000, and 1,580,000 m3/s, based on triangular hydrographs of 70-, 90-, and 110-s durations, respectively. Flood-routing simulations were made for
the three landslide-induced overtopping floods over a 530-km reach of the Bartang and Panj Rivers below the Usoi dam. A one-dimensional
flow model using a Riemann numerical solution technique was selected for the analysis. For the 87 million cubic meter volume
overtopping flood scenario, the peak flows were approximately 1, 100, 800, and 550 m3/s at locations 50, 100, and 150 km downstream of the dam respectively. |
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Keywords: | natural dams flood routing overtopping floods Tajikistan flood hydrograph rockslides landslides |
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