Magnetic properties of sediments within the water-level fluctuation zone of the Three Gorges Reservoir and their response to provenance and hydrodynamic conditions

IF 2.8 3区 农林科学 Q3 ENVIRONMENTAL SCIENCES
Ting Chen, Yujie Chen, Xiaofeng Wang, Xingping Wei, Liuliu Feng, Yixuan Wang
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Abstract

Purpose

Iron-bearing magnetic minerals in the sediments of the water-level fluctuation zone (WLFZ) in large reservoirs play critical roles in the burial and release of organic carbon and pollutants. This study aims to reveal the spatial distribution of magnetic minerals across different elevations and reaches within the WLFZ of the Three Gorges Reservoir (TGR), the largest reservoir in the world, and their links to sediment provenance and hydrodynamic conditions. This study will provide a fundamental basis for future investigations in the roles of magnetic minerals in the circulation processes of pollutants and organic carbon within the WLFZ of fluvial-reservoir systems.

Materials and methods

~ 300 sediment samples and nearby side-slope soils were collected from various altitudes within the WLFZ at ten different sites of the TGR. The magnetic properties of these sediments and soils were examined using environmental magnetism. Additionally, previously reported data on magnetic properties of suspended sediments from upstream rivers flowing into the TGR were assembled. Nearby side-slope soils and suspended samples were used to represent magnetic properties of potential sources for the sediments within the WLFZ.

Results and discussion

Our findings reveal that magnetite/maghemite and hematite particles dominate the sediments within the WLFZ of the TGR. Relatively higher concentration of hematite particles in the upper part (> 165 m) of WLFZ mainly originates from or are nearby side-slope soils, whereas higher concentration of magnetite/maghemite particles in the lower part of WLFZ is primarily due to sediment supply from upstream of the Yangtze River. The dominance of coarser magnetite/maghemite within the WLFZ of the upper reach of the TGR, from Jiangjin district to Fuling district, is due to strong water flow velocity. An increase in the concentration of nanosized fine-grained magnetic particles within the WLFZ of the middle and lower reaches of the TGR can be attributed to a combination of reduced water dynamics and intense regional soil erosion of nearby side slopes.

Conclusions

Our findings indicate that the concentration and grain size of magnetic minerals exhibit spatial variations within the WLFZ of reservoirs under the influences of sediment provenance and hydrodynamics. These findings provide fundamental insights on future exploration into the crucial roles of iron-bearing magnetic minerals in the accumulation, migration, and transformation of pollutants and organic carbon within the WLFZ of reservoirs and their response to changes in sediment sources and water dynamics.

Abstract Image

三峡水库水位波动区内沉积物的磁性及其对产状和水动力条件的响应
目的大型水库水位波动带(WLFZ)沉积物中的含铁磁性矿物在有机碳和污染物的埋藏和释放中起着关键作用。本研究旨在揭示世界上最大的水库--三峡水库(TGR)水位波动带内不同海拔高度和河段的磁性矿物空间分布及其与沉积物产地和水动力条件的联系。这项研究将为今后研究磁性矿物在河流-水库系统 WLFZ 内污染物和有机碳循环过程中的作用奠定基础。材料和方法~ 在台儿庄水库的十个不同地点,从 WLFZ 内的不同高度采集了 300 个沉积物样本和附近的边坡土壤。利用环境磁学研究了这些沉积物和土壤的磁性。此外,还收集了以前报告过的从流入湍河流域的上游河流中采集的悬浮沉积物的磁特性数据。附近的边坡土壤和悬浮样本被用来代表 WLFZ 内沉积物潜在来源的磁性。结果与讨论我们的研究结果表明,磁铁矿/菱镁矿和赤铁矿颗粒在台儿庄水库 WLFZ 内的沉积物中占主导地位。相对而言,WLFZ 上部(> 165 m)较高浓度的赤铁矿颗粒主要来源于或附近的边坡土壤,而 WLFZ 下部较高浓度的磁铁矿/闪长岩颗粒则主要来自长江上游的沉积物补给。从江津区到涪陵区的沣河上游WLFZ内,较粗的磁铁矿/菱镁矿占主导地位,这是因为水流速度较快。滩涂堰塞湖中下游WLFZ内纳米级细粒磁性颗粒浓度的增加可归因于水动力减弱和附近边坡强烈的区域性土壤侵蚀。结论我们的研究结果表明,在沉积物来源和水动力的影响下,储层 WLFZ 内磁性矿物的浓度和粒度呈现空间变化。这些发现为今后探索含铁磁性矿物在水库 WLFZ 内污染物和有机碳的积累、迁移和转化中的关键作用及其对沉积物来源和水动力学变化的响应提供了基本见解。
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来源期刊
Journal of Soils and Sediments
Journal of Soils and Sediments 环境科学-土壤科学
CiteScore
7.00
自引率
5.60%
发文量
256
审稿时长
3.5 months
期刊介绍: The Journal of Soils and Sediments (JSS) is devoted to soils and sediments; it deals with contaminated, intact and disturbed soils and sediments. JSS explores both the common aspects and the differences between these two environmental compartments. Inter-linkages at the catchment scale and with the Earth’s system (inter-compartment) are an important topic in JSS. The range of research coverage includes the effects of disturbances and contamination; research, strategies and technologies for prediction, prevention, and protection; identification and characterization; treatment, remediation and reuse; risk assessment and management; creation and implementation of quality standards; international regulation and legislation.
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