湖泊科学2011，Vol.23Issue(6)：910-918,9.
黄河中游北洛河宜君段全新世特大洪水及其气候背景研究
Holocene palaeo-floods and climatic changes in the Yijun reaches of the Beiluohe River,middle reaches of the Yellow River
摘要
Abstract
Holocene palaeo-flood slackwater deposits (SWD) were found in Yijun reaches of the Beiluohe River in the middle reaches of the Yellow River. They were identified by sedimentary criteria during fieldwork initially. A set of three beds of palaeo-flood SWD was interbedded in the Holocene loess-soil sequence within the cliff riverbanks. Each of the SWD represents one individual palaeo-flood event. The analytical results of grain-size distribution and magnetic susceptibility indicate that these SWD beds were deposited from the suspended sediment load in the floodwater. According to climatic and stratigraphic correlation with the OSL dated Holocene profiles in the region, these palaeo-flood events occurred during 8000 - 7800 aBP ( SWD1), 6000 - 5000 aBP (SWD2) and 4200 -4000 aBP(SWD3), respectively. The palaeo-flood peak discharges were calculated by hydrological models and estimated to between 13600 and 14100 m3/s. The archives of flood data were therefore extended to a time-scale of over 10000 years. A more reliable flood peak discharge and frequency relationship was established accurately. These results are very important in hydraulic engineering and mitigating flood hazard in Beiluohe River basin. These palaeo-floods are well correlated to the abrupt climatic events occurred during the mid-Holocene Climatic Optimum. They provide solid evidence for investigating the social impacts of per-historical floods on the decline of the Neolithic civilizations in China' s monsoon regions.关键词
北洛河/黄河中游/古洪水/滞流沉积物/全新世大暖期/气候突变Key words
Beiluohe River/mildle reaches of the Yellow River/palaeo-flood/slackwater deposits/Holocene Climatic Optimum/abrupt change引用本文复制引用
王夏青,黄春长,庞奖励,查小春,周亚利,王恒松,顾洪亮,周芳,魏海燕..黄河中游北洛河宜君段全新世特大洪水及其气候背景研究[J].湖泊科学,2011,23(6):910-918,9.基金项目
国家自然科学基金重点项目(41030637,40771018)和中央高校基本科研业务费专项基金项目(GK200901007,GK200902020)联合资助. （41030637,40771018）
