Reconstructing the extraordinary palaeoflood events during 3200–2800 a BP in the upper reaches of Hanjiang River Valley, China

Auteur(s) et Affiliation(s)



Description :
Through field investigation in the upper reaches of Hanjiang River, palaeoflood slackwater deposits (SWD) were found and analysed in the bedrock gorges of the Yunxi reach. By using stratigraphic correlation and OSL dating method, the palaeoflood event was dated to be 3200–2800 a BP at the turn from the middle to late Holocene. According to the palaeoflood peak stage and hydraulic parameters, the peak discharges of the palaeoflood were reconstructed by using the slope-area method. At same time, the flood peak discharges of 1983, 2005 and 2010 severe floods were reconstructed with the same method and hydraulic parameters in the same cross section. The results showed that the reconstructed palaeoflood peak discharges were reliable. The flood peak discharge-frequency relationship at 10,000 - year time scale was established by a combination of the gauged flood, historical flood and palaeoflood hydrological data. These results are very important for hydraulic engineering and flood mitigation on the Hanjiang River.


Type de document :
Article de périodique

Source :
Journal of geographical sciences. Acta geographica sinica, issn : 1009-637X, 2014, vol. 24, n°. 3, p. 446-456, nombre de pages : 11, Références bibliographiques : 33 ref.

Date :
2014

Editeur :
Pays édition : Chine