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

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

作     者:ZHA Xiaochun HUANG Chunchang PANG Jiangli ZHOU Yali 

作者机构:College of Tourism and Environment Science Shaanxi Normal University Xi'an 710062 China 

出 版 物:《Journal of Geographical Sciences》 (地理学报(英文版))

年 卷 期:2014年第24卷第3期

页      面:446-456页

核心收录:

学科分类:12[管理学] 1204[管理学-公共管理] 07[理学] 070601[理学-气象学] 083305[工学-城乡生态环境与基础设施规划] 08[工学] 0706[理学-大气科学] 0833[工学-城乡规划学] 

基  金:Foundation: National Natural Science Foundation of China, No.41030637, No.41271108 Ph.D. Programs Foundation from Ministry of Education of China, No.20110202130002 

主  题:upper reaches of Hanjiang River slackwater deposit extraordinary palaeoflood Holocene 

摘      要:Palaeoflood hydrology study is a leading subject in global change study. Through field investigation in the upper reaches of Hanjiang River, palaeoflood slackwater deposits (SWD) were found in the bedrock gorges of the Yunxi reach. The results of field observation, laboratory analysis including particle-size distribution and magnetic susceptibility, and com- parison with modern flood deposits, the SWD were identified as the most typical Holocene palaeoflood deposits of the Hanjiang River. By using stratig;aphic 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 as 48,830-51,710 m3/s 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 error between the reconstructed and gauged discharges was 1.99%-4.21%. This 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 com- bination 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.

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