黄河龙门段商周转折时期的古洪水事件及气候背景

发布时间：2018-04-14 23:08

本文选题：古洪水 + 商末　；参考：《湖泊科学》2017年01期

【摘要】：通过野外观察研究,在黄河中游晋陕峡谷龙门段乡宁-韩城大桥西端支沟内,发现了全新世古洪水滞流沉积物.通过野外观察和室内实验分析,证明它们是黄河特大洪水悬移质泥沙在高水位滞流环境下的沉积物,记录了黄河晋陕峡谷段一期4次特大古洪水事件.通过地层学对比分析和光释光测年,确定这4次洪水发生在全新世中期-晚期转折阶段,即我国历史上商代末期-西周初期的气候突变转型期.利用"古洪水滞流沉积物厚度含沙量法"恢复古洪水洪峰水位,运用HEC-RAS模型估算出4次古洪水事件洪峰流量介于46280~48800 m~3/s之间.这些成果为黄河中游地区的防洪减灾、水资源开发利用、流域生态环境综合治理等方面提供了可靠的超长尺度水文数据.这为深入理解黄河流域水文系统对于全球变化的响应规律提供了新的证据.
[Abstract]:Through field observation and study, the Holocene paleo-flood stagnant sediment was found in the western branch ditch of Xiangning Hancheng Bridge in Longmen section of Jinshan Gorge in the middle reaches of the Yellow River.Through field observation and laboratory experimental analysis, it is proved that they are sediments of suspended sediment in the environment of high water level and stagflation in the Yellow River, and the first phase of the Jinshan Valley of the Yellow River is recorded in the first phase of 4 times of paleo-flood events.By means of stratigraphic comparative analysis and photoluminescence dating, it is determined that the four floods occurred in the transitional period from the middle Holocene to the late Holocene, that is, the climatic abrupt transition period from the late Shang Dynasty to the early Western Zhou Dynasty in the history of China.The paleo flood Hong Feng water level was restored by the method of sediment thickness and sediment thickness in paleo-flood, and four paleo-flood events, Hong Feng discharge, were estimated by using HEC-RAS model. The discharge was between 46280 ~ 48800 m ~ (-1) m ~ (3 / s).These results provide reliable super-long scale hydrological data for flood control and disaster reduction, exploitation and utilization of water resources and comprehensive management of ecological environment in the middle reaches of the Yellow River.This provides new evidence for further understanding the response of the hydrological system of the Yellow River Basin to global change.
【作者单位】：陕西师范大学旅游与环境学院;
【基金】：国家自然科学基金项目(41471071)资助
【分类号】：P532;P333.2

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