Evolution in the Yellow River Estuary over the past 20 years by sediment load variation and sea-level rise

Geo-Marine Letters, Journal Year: 2025, Volume and Issue: 45(1)

Published: Jan. 3, 2025

Language: Английский

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Comprehensive analysis of sediment grain features and their engineering implications in the Yangtze River source area

Frontiers in Soil Science, Journal Year: 2025, Volume and Issue: 5

Published: Feb. 25, 2025

Introduction The particle size characteristics of irregular sediments in the Yangtze River Source Area (YRSA) are pivotal for understanding mechanical properties sedimentary medium. Methods This study utilizes field sediment sampling, laser scanning, laboratory testing, and mathematical statistics to analyze morphological, geometric, mineralogical, accumulation particles region. Results Our findings indicate that YRSA have angular edges deviate from spherical shapes, exhibiting elongated flatter three-dimensional morphologies. In experiment, sliding plate method was used measure angle repose sediments, which found be 36.7° above water 35.9° below water. Both values higher than typical range non-plateau regions, indicating reduced mobility. composed fine-grained coarse-grained soils. distribution is primarily coarse sand (0.5-2.0 mm), fine gravel (2.0-5.0 medium (5.0-20.0 with a significant coarsening trend observed over past six years. mineral composition, dominated by quartz, feldspar, heavy minerals, stable, approximately 70% minerals having hardness ≥ 7 on Mohs scale. most abundant trace elements Ti, Mn, Ba, P, Sr, Zr, Cl. Discussion research reveals markedly different those natural sands necessitating reevaluation conventional theories engineering practices constructions this area. insights profound practically relevant, illuminating transport dynamics alpine river systems supporting sustainable regional development.

Language: Английский

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Impacts of Water and Sediment Fluxes into the Sea on Spatiotemporal Evolution of Coastal Zone in the Yellow River Delta

Land, Journal Year: 2025, Volume and Issue: 14(4), P. 834 - 834

Published: April 11, 2025

Water and sediment fluxes into the sea are basis for stability of ecological pattern Yellow River Delta (YRD). As a Ramsar wetland international importance, YRD is facing huge risk land degradation due to changes in water–sediment sea. In this study, we investigated spatiotemporal dynamics coastline subaerial delta using annual remote sensing images revealed more detailed clear relationships between evolution, including whole its subregions (e.g., Qingshuigou Diaokou regions) from 1976 2022. Our results showed that mean yearly water during study period amounted 210.50 × 108 m3 yr−1 367.81 Mt yr−1, respectively. There was an abrupt change 1999, both decreased significantly whereas discharge has increased flux stabilized since around 2000. The area evolutions region can be characterized by three stages: rapid growth stage (1976–1993), retreat (1993–2002), gradual recovery (2002–2022). displayed continuous decreasing trend regression analysis indicated cumulative accretion presented differentiation. with 1992, 1993 2002, except northeast Qingshuigou, then expanded 2003 2022, southeast Qingshuigou.

Language: Английский

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Pollution and Ecological Risk Assessment of Potentially Toxic Elements in Sediments Along the Fluvial-to-Marine Transition Zone of the Don River

Water, Journal Year: 2024, Volume and Issue: 16(22), P. 3200 - 3200

Published: Nov. 7, 2024

The quality of sediments in the mixing zone river freshwater and marine saline water as an important geochemical barrier for potentially toxic elements (PTEs) remains poorly understood. This study aims to analyze current pollution with PTEs associated ecological risks Don River delta surrounding area Taganrog Bay Sea Azov (Russia). PTE content was determined fifty-four collected samples using WDXRF assessed ecotoxicological indicators. source Cr, Mn, Ni Pb is mainly runoff, Cu, Zn Cd are from a variety anthropogenic sources. As shown by assessment geoaccumulation index (Igeo), single (PI) contamination factor (CF), these priority pollutants. According estimates, high very estuarine detected 72–94% 2–57% samples, respectively. However, environmental almost exclusively level Cd. Total Nemerow (NPI), modified degree (mCd) metal (MPI) concern 83–98% studied. most heavily polluted vicinity residential areas Bay. Despite lower average levels deltaic sediments, biota exposed higher potential adverse effects PTE, particularly Pb. Thus, complex hydrological regime uneven impact predetermine state River.

Language: Английский

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