汉江上游郧县前坊段全新世古洪水水文学研究

对汉江上游郧县段全新世古洪水滞流沉积层进行了沉积学和水文学研究。结果表明，该沉积物是古洪水悬移质泥沙在高水位滞流环境中堆积形成的，与黄土和古土壤显著不同。通过OSL测年和文化层的考古学断代，表明它所记录的特大古洪水事件发生在东汉时代（200 A.D.）。根据沉积学和水文学原理恢复古洪水水位高程，计算得到古洪水洪峰流量为65 830 m3/s；利用2011年汉江上游洪水洪痕记录的洪峰水位高程反演其洪峰流量，推算结果与实测数据误差仅09%，证明研究获得的古洪水水文数据合理可靠，从而为汉江上游的水利工程建设及流域内的防洪减灾提供了基础数据

PALAEOFLOOD HYDROLOGICAL STUDY IN THE QIANFANG SECTION OF YUNXIAN COUNTY IN THE UPPER REACHES OF THE HANJIANG RIVER

Palaeoflood hydrological investigations were carried out in the Yunxian Reach in the upper reaches of the Hanjiang River.The results indicate that these deposits have been deposited by suspended sediment load in the palaeoflood water.They are different from eolian loess and soil in the Holocene profile.The palaeoflood events were dated to 200 A.D.by OSL dating method and archaeological dating on human remains underlying the palaeoflood SWD.The peak discharges of the palaeofloods were reconstructed to 65 830 m3/s with the slope-area method.This result was checked with various methods which indicate the reconstructed peak discharge is reliable.This result provides significant data for hydraulic engineering and flood control in the upper reaches of the Hanjiang River.