Elevation of basal lacustrine sediments along the mid-lower reaches of the Yangtze River and its implications for the reconstruction of Holocene water levels

IF 6 2区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY Science China Earth Sciences Pub Date : 2024-07-18 DOI:10.1007/s11430-023-1374-y
Shuchun Yao, Chunhai Li, Bin Xue
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Abstract

The middle and lower reaches of the Yangtze River, a primary region for freshwater lakes in China, have undergone significant transformations throughout the Holocene. These changes, driven by factors such as sea-level rise, climate change, and human activities, have led to the progressive elevation of water levels in this area. As a result, a floodplain has emerged, characterized by the formation of numerous shallow lakes along the river course. However, the pattern of water-level changes in the main channel of the Yangtze River during the Holocene remains unclear. This gap in knowledge poses challenges for understanding sediment transport dynamics, the interactions between the river and its adjacent lakes, and the prevention and control of flood disasters in the Yangtze River basin. To shed light on these issues, our study compiled data on the surface elevation and water depth of 81 lakes in the mid-lower reaches of the Yangtze River basin. Additionally, we analyzed historical water-level records from the 1900s to the 1970s at eight gauging stations from Shashi to Jiangyin along the river’s main stream. Our findings reveal that, particularly along the Jingjiang section, the basal elevation of most lakes is lower than the Yangtze River’s water level during the dry season. Conversely, the water level of the main stream exceeds that of both the floodplain and the lakes enclosed by the Jingjiang embankment. In the tidal reach, especially within the Taihu Lake basin, the basal elevation of lakes typically falls below sea level. Meanwhile, lakes located along the section from Chenglingji to Wuhu exhibit basal elevations that correspond with the Yangtze River’s annual average and dry season water levels. Given the widespread presence of lakes along the middle and lower reaches of the Yangtze River, our study introduces a new proxy for reconstructing the mean water level of the mid-lower Yangtze River in the Holocene. By analyzing sediments from Nanyi Lake and Chenyao Lake in the lower Yangtze River, we attempted to reconstruct the water level of the Yangtze River’s main channel since 8 ka BP.

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长江中下游基底湖相沉积的抬升及其对全新世水位重建的影响
长江中下游是中国淡水湖泊的主要区域,在整个全新世期间经历了重大变化。在海平面上升、气候变化和人类活动等因素的推动下,这些变化导致该地区的水位逐渐升高。因此,出现了一个洪泛平原,其特点是沿河道形成了许多浅湖。然而,全新世期间长江主航道的水位变化规律仍不清楚。这一知识空白对理解长江流域的泥沙输移动力学、河流与邻近湖泊之间的相互作用以及洪水灾害的防控提出了挑战。为了揭示这些问题,我们的研究汇编了长江流域中下游 81 个湖泊的湖面高程和水深数据。此外,我们还分析了从 20 世纪到 20 世纪 70 年代长江干流沙市至江阴沿线八个测站的历史水位记录。我们的研究结果表明,尤其是在荆江段,大多数湖泊的基底高程在枯水期低于长江水位。相反,干流的水位则超过洪泛区和荆江大堤所围湖泊的水位。在潮汐区,尤其是太湖流域内,湖泊的基底标高通常低于海平面。同时,位于城陵矶至芜湖段的湖泊的基底高程与长江的年平均水位和枯水期水位一致。鉴于长江中下游湖泊的广泛存在,我们的研究为重建全新世长江中下游的平均水位提供了新的替代方法。通过分析长江下游南漪湖和陈瑶湖的沉积物,我们试图重建公元前 8 kaP 年以来长江主航道的水位。
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来源期刊
Science China Earth Sciences
Science China Earth Sciences GEOSCIENCES, MULTIDISCIPLINARY-
CiteScore
9.60
自引率
5.30%
发文量
135
审稿时长
3-8 weeks
期刊介绍: Science China Earth Sciences, an academic journal cosponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China, and published by Science China Press, is committed to publishing high-quality, original results in both basic and applied research.
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