New insights into dating the sediment sequence within a landslide-dammed reservoir on the Chinese Loess Plateau
New insights into dating the sediment sequence within a landslide-dammed reservoir on the Chinese Loess Plateau
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对中国黄土高原滑坡坝水库沉积物序列测年的新见解
DOI：
10.1177/0959683619831426
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发表时间：
2019-06
期刊：
影响因子：
--
通讯作者：
Jianwei Xu
中科院分区：
文献类型：
--
作者：
Xiaqing Wang;Zhangdong Jin;Zhong He;Ling Zhou;Jianwei Xu
黄土高原淤地坝和淤地坝水库的淤积组合记录了流域土壤侵蚀、输移和淤积的过程和历史，这些过程和历史与洪水、生态环境和土地利用变化以及人类活动有关。以前，测年的对联主要是依赖于之间的多重相互比较之间的特定的沉积物产量的可见对联，137 Cs活动分布和侵蚀性降雨事件的气象记录。然而，对滑坡坝水库沉积组合的年际划分和气象记录以外的历史序列的断代却知之甚少。基于对长江三峡工程中部丘陵沟壑区靖边水库22.75 m沉积物序列的高分辨率XRF岩心扫描和多种测年方法的交叉检验，提出了一种基于年际划分的精确年代序列建立方法，并对无降雨记录的沉积物进行了进一步测年。结果表明，JB序列共识别出126个沉积偶和78个年冻融层。137Cs活度、年冻融层、比产沙量和现代降雨记录等多方法交叉定年是20世纪60年代以来结合详细气象记录对JB沉积物序列进行定年的最准确方法。此外，年冻融层与文献中洪水指数历史等级的对应关系是确定无降雨记录的JB历史序列的有效方法。因此，JB序列在1855年至2014年期间沉积。JB层序的高分辨率测年为恢复CLP中央丘陵沟壑区自19世纪50年代以来的自然和人为信息提供了年代学依据。所提出的方法也将为CLP中部和北方其他淤地坝和滑坡坝水库的沉积物序列的精确定年提供新的思路。
The deposition couplets within the check dams and landslide-dammed reservoirs on the Chinese Loess Plateau (CLP) document the processes and histories of watershed soil erosion, transportation and deposition, related to floods, eco-environment and land use changes, and human activities. Previously, dating the couplets was dominantly dependent on multiple intercomparisons among specific sediment yields of visible couplets, 137Cs activities distributions and erosive rainfall events by meteorological records. However, inter-annual division of the deposition couplets and dating historical sequence beyond meteorological records in the landslide-dammed reservoir are little known. Based on high-resolution XRF core scanning on a 22.75 m sediment sequence in Jingbian (JB) landslide-dammed reservoir on the central hilly-gully area of the CLP, and cross checking of multiple dating methods, this study tried to propose a new method to build the accurate chronology sequence based on inter-annual division by annual freeze-thaw layer and to further date the sediment without rainfall records. The results showed that a total of 126 deposition couplets and 78 annual freeze-thaw layers were identified in the JB sequence. Multimethod cross-dating, including 137Cs activities, annual freeze-thaw layers, couplet specific sediment yield and modern rainfall records, was the most accurate method of dating the JB sediment sequences since 1960s with detail meteorological records. Furthermore, the correspondence between annual freeze-thaw layers and the historical grades of flood index from literature was the valid method to date the JB historical sequences without rainfall records. Consequently, the JB sequence was deposited during the period between 1855 and 2014. High-resolution dating of the JB sequence provides the chronology for recovering natural and anthropogenic information on the central hilly-gully area of CLP since 1850s. The proposed methods will also shed new light on the accurate dating of the sediment sequences within other check dams and landslide-dammed reservoirs on the central and northern CLP.
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