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Sedimentary and hydrological studies of the Holocene palaeofloods in the middle reaches of the Jinghe River

, : Sedimentary and hydrological studies of the Holocene palaeofloods in the middle reaches of the Jinghe River. Journal of Geographical Sciences 22(3): 470-478

Palaeo-hydrological field investigation was carried out in the middle reaches of the Jinghe River. A set of palaeoflood slackwater deposit beds was identified in the Holocene loess-soil sequence in the riverbanks. The sediment samples were collected from the profile, and the particle-size distribution, magnetic susceptibility, loss-on-ignition were analyzed in laboratory. The analytical results showed that the palaeoflood slackwater deposits have recorded extraordinary flood events in the Jinghe River valley. According to stratigraphic correlation and OSL dating, the palaeoflood events were dated to 41 4 a BP. The palaeoflood peak discharges were estimated to be 19,41 22,28 m3/s by using the hydrological model and checked by different approaches. These results have the flood data sequence of the Jinghe River extended to 1,-year time-scale. It provided significant data for hydraulic engineering and for mitigation of flood hazards in the Jinghe River drainage basin.


DOI: 10.1007/s11442-012-0940-3

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