River bank instability from unsustainable sand mining in the lower Mekong River

@article{Hackney2020RiverBI,
  title={River bank instability from unsustainable sand mining in the lower Mekong River},
  author={Christopher R. Hackney and Stephen E. Darby and Daniel R. Parsons and Julian Leyland and James L. Best and R. E. Aalto and Andrew P. Nicholas and Robert C. Houseago},
  journal={Nature Sustainability},
  year={2020},
  volume={3},
  pages={217-225}
}
Recent growth of the construction industry has fuelled the demand for sand, with considerable volumes being extracted from the world’s large rivers. Sediment transport from upstream naturally replenishes sediment stored in river beds, but the absence of sand flux data from large rivers inhibits assessment of the sustainability of ongoing sand mining. Here, we demonstrate that bedload (0.18 ± 0.07 Mt yr −1 ) is a small (1%) fraction of the total annual sediment load of the lower Mekong River… 
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References

SHOWING 1-10 OF 69 REFERENCES
Linking rapid erosion of the Mekong River delta to human activities
TLDR
Shoreline erosion is an additional hazard to the integrity of this Asian mega delta now considered particularly vulnerable to accelerated subsidence and sea-level rise, and will be exacerbated by future hydropower dams.
Reappraisal of sediment dynamics in the Lower Mekong River, Cambodia
The Mekong Basin in southeast Asia is facing rapid development, impacting its hydrology and sediment dynamics. Although the understanding of the sediment transport rates in the Mekong is gradually
Dams on the Mekong: Cumulative sediment starvation
The Mekong River, largely undeveloped prior to 1990, is undergoing rapid dam construction. Seven dams are under construction on the mainstem in China and 133 proposed for the Lower Mekong River and
PROFILE: Hungry Water: Effects of Dams and Gravel Mining on River Channels
  • G. Kondolf
  • Environmental Science, Geology
    Environmental management
  • 1997
TLDR
Management of sand and gravel in rivers must be done on a regional basis, restoring the continuity of sediment transport where possible and encouraging alternatives to river-derived aggregate sources.
Fluvial sediment supply to a mega-delta reduced by shifting tropical-cyclone activity
TLDR
This study shows that changes in tropical-cyclone climatology affect trends in fluvial suspended sediment loads and thus are also key to fully assessing the risk posed to vulnerable coastal systems.
Sand mining effects, causes and concerns: A case study from Bestari Jaya, Selangor, Peninsular Malaysia
TLDR
The assessment of water quality shows that water has been highly polluted immediately downstream of station at Selangor River due to high concentrations of suspended particles, and transport modeling and water quality analyses performed have identified major physical environmental impacts.
Bedform transport rates for the lowermost Mississippi River
[1] New methods of data collection and processing are developed to provide quantitative, reach-scale measurements of bedform transport mass within the tidally influenced Mississippi River. A
...
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