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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Asia
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Far East
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Philippine Islands
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Luzon
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Mount Pinatubo (2)
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United States
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Minnesota (1)
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geochronology methods
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optically stimulated luminescence (1)
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geologic age
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Cenozoic
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Quaternary (1)
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Primary terms
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Asia
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Far East
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Philippine Islands
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Luzon
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Mount Pinatubo (2)
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Cenozoic
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Quaternary (1)
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ecology (1)
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geomorphology (3)
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hydrology (1)
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remote sensing (1)
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sedimentation (2)
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sediments (3)
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United States
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Minnesota (1)
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sedimentary structures
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channels (2)
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sediments
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sediments (3)
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Landscape evolution, valley excavation, and terrace development following abrupt postglacial base-level fall
Long-term elevated post-eruption sedimentation at Mount Pinatubo, Philippines
Geomorphic evolution of the Le Sueur River, Minnesota, USA, and implications for current sediment loading
There is clear evidence that the Minnesota River is the major sediment source for Lake Pepin and that the Le Sueur River is a major source to the Minnesota River. Turbidity levels are high enough to require management actions. We take advantage of the well-constrained Holocene history of the Le Sueur basin and use a combination of remote sensing, field, and stream gauge observations to constrain the contributions of different sediment sources to the Le Sueur River. Understanding the type, location, and magnitude of sediment sources is essential for unraveling the Holocene development of the basin as well as for guiding management decisions about investments to reduce sediment loads. Rapid base-level fall at the outlet of the Le Sueur River 11,500 yr B.P. triggered up to 70 m of channel incision at the mouth. Slope-area analyses of river longitudinal profiles show that knickpoints have migrated 30–35 km upstream on all three major branches of the river, eroding 1.2–2.6 × 10 9 Mg of sediment from the lower valleys in the process. The knick zones separate the basin into an upper watershed, receiving sediment primarily from uplands and streambanks, and a lower, incised zone, which receives additional sediment from high bluffs and ravines. Stream gauges installed above and below knick zones show dramatic increases in sediment loading above that expected from increases in drainage area, indicating substantial inputs from bluffs and ravines.