Reconstruction palaeoflood hydrology using slackwater flow depth method in the Yanhe River valley, middle Yellow River basin, China
Reconstruction palaeoflood hydrology using slackwater flow depth method in the Yanhe River valley, middle Yellow River basin, China
复制标题
黄河流域中游延河流域滞水流深度法重建古洪水水文
DOI：
10.1016/j.jhydrol.2016.11.017
复制
发表时间：
2017-01-01
影响因子：
6.4
通讯作者：
Mao, Peini
中科院分区：
文献类型：
--
作者：
Guo, Yongqiang;Huang, Chun Chang;Mao, Peini
在计算古气候峰期时，应考虑洪水沉积物之上的水深，这样可以更准确地估计古气候峰期。本文提出了一种新的评价古森林高峰期的方法--静水流深度法，以减少对古森林高峰期的低估。黄河中游延河陡崖河岸带，根据古水文标志，识别出古森林滞水沉积。光释光法测定了SWD四层记录的古气候事件的年代为9.5- 8.5ka。用静水流深度法估算古洪水最大水位为778.3m，用阶跃回水法估算古洪水峰值流量为15, 000 m3/s。古洪水成果极大地扩展了延河流域现有的洪水资料系列。对黄河中游主要支流的区域洪水史进行了整理和评价，包括实测洪水、历史洪水和古洪水资料。该地区古森林洪峰流量与流域面积的关系与全球最大值曲线吻合较好。特定地点和区域古洪水评估的结果表明，该方法估计真正的古洪水峰值阶段和流量，并提高了洪水频率分析的极端和罕见的洪水为一个特定的流域。同时，这种方法的优点和不确定性需要在古森林调查中继续讨论。(C)2016爱思唯尔B. V.保留所有权利。
Water depth above the flood deposits should be taken into account in calculations of the palaeoflood peak stages, which can provide more accurately estimate of palaeoflood stage. Here we present a new method, slackwater flow depth, to assess palaeoflood peak stage and to reduce the underestimation of palaeoflood stage. Palaeoflood slackwater deposits (SWDs) were identified by palaeohydrological criteria in cliff riverbank on the Yanhe River, middle Yellow River basin. Palaeoflood events recorded in four layers of SWD were dated by optical stimulated luminescence to 9.5-8.5 ka. The estimation of palaeoflood maximum stage was 778.3 m using the slackwater flow depth method and the palaeoflood peak discharge is 15,000 m3/s using the step-backwater method. Palaeoflood results greatly extend the current flood data series in the Yanhe River basin. The regional flood history including gauged flood, historical and palaeoflood data was compiled and evaluated for the major tributaries of the middle Yellow River. The relationship between palaeoflood peak discharges and drainage areas in this region fit well with the global maximum curves. The results of site-specific and regional palaeoflood evaluations demonstrate that the approach estimates the true palaeoflood peak stage and discharges and improves the flood frequency analysis of extreme and rare floods for a particular basin. Meanwhile, the advantages and uncertainties of this method need ongoing discussion in palaeoflood investigations. (C) 2016 Elsevier B.V. All rights reserved.