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

Christopher R. Hackney, Stephen E. Darby, Daniel R. Parsons, Julian Leyland, James L. Best, Rolf Aalto, Andrew P. Nicholas, Robert C. Houseago

Research output: Contribution to journalArticlepeer-review

Abstract

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. Even when considering suspended sand (6 ± 2 Mt yr−1), the total sand flux entering the Mekong delta (6.18 ± 2.01 Mt yr−1) is far less than current sand extraction rates (50 Mt yr−1). We show that at these current rates, river bed levels can be lowered sufficiently to induce river bank instability, potentially damaging housing and infrastructure and threatening lives. Our research suggests that on the Mekong and other large rivers subject to excessive sand mining, it is imperative to establish regulatory frameworks that limit extraction rates to levels that permit the establishment of a sustainable balance between the natural supply/storage of sand and the rate at which sand is removed.

Original languageEnglish (US)
JournalNature Sustainability
DOIs
StateAccepted/In press - Jan 13 2020

ASJC Scopus subject areas

  • Global and Planetary Change
  • Food Science
  • Geography, Planning and Development
  • Ecology
  • Renewable Energy, Sustainability and the Environment
  • Urban Studies
  • Nature and Landscape Conservation
  • Management, Monitoring, Policy and Law

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