黄河上游靖远—景泰段全新世古洪水水文学  

Palaeoflood Hydrological Reconstruction in JingyuanJingtai Reach in Upper Yellow River Valley

作　　者：胡贵明[1] 黄春长[1] 周亚利[1] 庞奖励[1] 查小春[1] 郭永强[1] 

机构地区：[1]陕西师范大学旅游与环境学院,西安710062

出　　处：《吉林大学学报（地球科学版）》2015年第6期1822-1832,共11页Journal of Jilin University：Earth Science Edition

基　　金：国家自然科学基金项目(41471071);教育部博士点基金优先发展领域项目(20110202130002)

摘　　要：对黄河上游靖远—景泰段峡谷进行系统野外考察,在靖远县金坪村(JPC)发现典型的全新世古洪水滞流沉积物。通过光释光(OSL)测年和与黄河吉县段FJJ剖面进行地层对比,确定这期特大古洪水事件发生在3 200~3 000aB.P.,即全新世中期—晚期气候恶化转折阶段,对应着我国历史上商末至西周早期。采用古洪水水文学方法恢复古洪水洪峰水位,并且采用比降-面积法计算这一期多次古洪水事件的洪峰流量为16 110~17 740m3/s。同时,根据野外调查获得2012年7月31日黄河上游大洪水的洪痕高程,采用相同参数和方法恢复其洪峰流量,误差仅有2.7%,表明在该河段对于古洪水水文恢复计算参数选取和计算结果是可靠的。A systematical field investigation is carried out in the upper Yellow River valley from Jingtai to Jingyuan reach .Palaeoflood slackwater deposits (SWD) are identified at several sites .The Holocene sediment profile at the site of Jinpingcun (JPC) is chosen for a further study on the palaeoflood hydrology .OSL dating and stratigraphic correlation with Jixian (FJJ) site in the middle reach gorge of the Yellow River show that these extreme palaeoflood events occurred during 3 200 3 000 a B .P .,at the time when the climate was at the turn from the Middle Holocene climatic optimum to the Late Holocene dry period .This corresponds to the transition period from Shang Dynasty to Western Zhou Dynasty when many serious drought and flood disasters , harvest failures , and major social changes occurred . The palaeoflood stage is obtained by palaeohydrological methods . The reconstructed palaeoflood peak discharges were 16 110 17 740 m 3 /s using the slope‐area method .Reconstruction of current flood (in 2012 .07 .31) and comparison with the gauged discharge prove that the hydrological method and hydrological parameters used are reliable .These results are very important to establish the relationship between peak discharge and occurrence frequency by 10 000‐year time‐scale in Lanzhou to Jingyuan reach .The method is very useful in Hydraulic engineering along the upper Yellow River .

关 键 词：黄河上游 全新世 古洪水 滞流沉积物 水文学 

分 类 号：P534.632[天文地球—第四纪地质学] P331[天文地球—古生物学与地层学]