地质学报2017，Vol.91Issue(10)：2351-2367,17.
汝河全新世古洪水沉积学与光释光测年研究
Sedimentology and OSL Dating Study of the Holocene Palaeoflood on the Ruhe River
摘要
Abstract
Notorious flood collapse event occurred in Zhumadian of Hunan province on August 1975,and shocked the world with its flood scale,huge stricken area and high death toll.Therefore,studying its occurrence regularity and climate background will be of great scientific significance.Through paleohydrological investigations carried out in Ruhe River,the Holocene loess-soil profiles with interbedded flood slackwater deposits (SWDs) were found in terrace I in the Zhumadian-Suiping section of the Ruhe River,which records the climate hydrological events in Ruhe River.Systematic sampling was carried out in the Holocene loess soil profiles at ZSX site in the Reaches of Ruhe River.Combined with particle sedimentary features,three sets of slackwater deposits (SWD) were identified within the Holocene loesssoil profiles,which are typical of suspended sediment load in the floodwater.Analysis of geochemical characteristics confirms the paleoflood slackwater deposits were the results of loess and soil on both sides of the Ruhe River during storm flood.The three palaeo-flood sediments record three palaeo-flood events occurring the last deglaciation and Holocene.By contrast of type stratigraphic profiles and optically stimulated luminescence (OSL) dating,precise stratigraphic chronology framework was constructed.Three palaeofloods were dated to 12000 ～ 11200 a BP,4200 ～ 4000 a BP and 3200 ～ 3000 a BP,respectively,all occurring in globally climate change or transforming periods.This study shows that the monsoonal climate was highly variable with both droughts and floods occurring in the Huai River.Our results are of great significance to mitigate flood disasters and exploit water resources,as well as to understand hydrological response to global climatic change.关键词
汝河/古洪水/全新世/光释光测年/气候变化Key words
Ruhe River/palaeoflood/Holocene/OSL dating/climatic change引用本文复制引用
陈莹璐,刘雯瑾,黄春长,张玉柱,郭永强,周亚利,李喻琴,庞奖励,查小春,石彬楠..汝河全新世古洪水沉积学与光释光测年研究[J].地质学报,2017,91(10):2351-2367,17.基金项目
本文为国家自然科学基金项目(批准号:41771110,41601020)和中国博士后科学基金项目(2016M59289)共同资助的成果. （批准号:41771110,41601020）
