Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/162661
Title: New systematically measured sand mining budget for the Mekong Delta reveals rising trends and significant volume underestimations
Authors: Gruel, Charles-Robin
Park, Edward
Switzer, Adam D.
Kumar, Sonu
Ho, Huu Loc
Kantoush, Sameh
Binh, Doan Van
Feng, Lian
Keywords: Engineering::Environmental engineering
Issue Date: 2022
Source: Gruel, C., Park, E., Switzer, A. D., Kumar, S., Ho, H. L., Kantoush, S., Binh, D. V. & Feng, L. (2022). New systematically measured sand mining budget for the Mekong Delta reveals rising trends and significant volume underestimations. International Journal of Applied Earth Observation and Geoinformation, 108, 102736-. https://dx.doi.org/10.1016/j.jag.2022.102736
Project: #SUG- NAP 3/19EP 
#Tier1 RT 06/19 
#Tier1 2021-T1-001-056 
#Tier2 MOE-T2EP402A20-0001 
Journal: International Journal of Applied Earth Observation and Geoinformation 
Abstract: The river beds of the Mekong Delta are some of the most intensively sand mined places in the world. However, sand mining budgets remain limited to rough and indirect estimates. Here, we provide a first systematic, field-based estimation of the Mekong Delta's sand mining budget. This budget overcomes the limitations of relying on officially declared statistics and bathymetric surveys of short channel reaches. We applied Sentinel-1 radar imagery to monitor the distribution of sand mining activities using boat metrics-driven mining intensity maps correlated with a field-based bathymetry difference map which were derived from two extensive bathymetric surveys conducted in 2014 and 2017. The two surveys cover ∼ 100 km in the Tiền River, reaching approximately 15% of the Mekong Delta. We then extrapolated the Tiền River findings to the broader Vietnamese Mekong Delta from 2015 to 2020 and measured a continuous increase of the extraction budget by ∼ 25% between 2015 (38 Mm3/yr) and 2020 (47 Mm3/yr). We estimated a total sand mining budget of 254 Mm3 during the 6-year study period with an average annual rate of ∼ 42 Mm3. Our field-based annual rates are higher than both official declarations provided and estimates from previous studies which implies that a substantial portion of the sand mining budget remains unaccounted for. Riverbed sand mining remains a key threat to the Mekong Delta as it contributes to a multitude of other environmental threats including dam construction effects on sedimentation, ongoing subsidence, sea level rise and recurring saltwater intrusion. This study offers a new approach that can be implemented elsewhere to allow for systematic monitoring and quantification of sand mining activities that are vital for assessing future projections on environmental impacts.
URI: https://hdl.handle.net/10356/162661
ISSN: 0303-2434
DOI: 10.1016/j.jag.2022.102736
Rights: © 2022 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:ASE Journal Articles
EOS Journal Articles

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