Mississippi Delta subsidence primarily caused by compaction of Holocene strata

Törnqvist, Torbjörn E.; Wallace, Davin J.; Storms, J.E.A.; Wallinga, Jakob; Dam, Remke L. Van; Blaauw, Martijn; Derksen, Mayke S.; Klerks, Cornelis J. W.; Meijneken, Camiel; Snijders, Els M. A.

doi:10.1038/ngeo129

Cited by 452 publications

(353 citation statements)

References 24 publications

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“…These figures are of the same order of magnitude as estimates of subsidence due to sediment loading at the Mississippi Delta (Yu et al, 2012). The additional 0.6 - 1.0 mm yr --1 subsidence required to match the Copper River Delta observations (RSL 3 ) is in line with estimates of estuarine sediment compaction rates from the UK (Horton and Shennan, 2009) and substantially less than millennial--scale compaction rates of 5 mm yr --1 inferred from the Mississippi Delta (Törnqvist et al, 2008). With a more detailed ground survey of the elevation of the sill than currently available, we could further refine our estimates of the relative contributions of sediment loading and sediment compaction through the age of the ingression.…”

Section: Different Combinations Of Process--responses Between Sitessupporting

confidence: 70%

Constraints on regional drivers of relative sea-level change around Cordova, Alaska

Garrett

Barlow

Cool

et al. 2015

Quaternary Science Reviews

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(2015) 'Constraints on regional drivers of relative sea-level change around Cordova, Alaska.', Quaternary science reviews., 113 . pp. 48-59. Further information on publisher's website:http://dx.doi.org/10. 1016/j.quascirev.2014.12.002 Publisher's copyright statement: NOTICE: this is the author's version of a work that was accepted for publication in Quaternary Science Reviews. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be re ected in this document. Changes may have been made to this work since it was submitted for publication. A de nitive version was subsequently published in Quaternary Science Reviews, 113, 1 April 2015, 10.1016/j.quascirev.2014 Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details.

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Section: Different Combinations Of Process--responses Between Sitessupporting

confidence: 70%

Constraints on regional drivers of relative sea-level change around Cordova, Alaska

Garrett

Barlow

Cool

et al. 2015

Quaternary Science Reviews

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“…In degrading deltas, enhanced compaction in organic-rich overbank areas [Törnqvist et al, 2008] may result in more fractal shorelines as non-channel areas subside below sea level, while in wave-dominated deltas diffusive dampening of the channelbifurcation instability [Jerolmack and Swenson, 2007] could result in non-fractal channel patterns.…”

Section: Discussionmentioning

confidence: 99%

Delta allometry: Growth laws for river deltas

Wolinsky¹,

Edmonds

Martin³

et al. 2010

Geophysical Research Letters

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[1] Under projected scenarios of sea-level rise, subsidence, and sediment starvation many deltas around the world are expected to drown. Delta growth dynamics, which determine the ability of a delta to adapt to these changes, are poorly understood due to the difficulty of measuring change in slowly evolving landscapes. We use timeseries imagery of experimental, numerical, and field-scale deltas to derive four laws that govern the growth of riverdominated deltas. Land area grows at a constant rate in the absence of relative sea level change, while wetted area keeps pace, maintaining a constant wetted fraction over the delta surface. Scaling of edge-lengths versus areas suggests delta shorelines are nonfractal, even though the channel network is fractal. Consequently channel-edge length, which provides critical habitat, grows more rapidly than delta area. These laws provide a blueprint for delta growth that will aid in delta restoration and help predict how existing deltas will evolve. Citation: Wolinsky, M.

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“…Processes such as tectonic subsidence, natural compaction, and artificial settlement do not account for more than a few mm/year of subsidence (2-5 mm/year [32,36]). Additionally, natural subsidence occurs uniformly over large areas with consistent sediment deposits.…”

Section: Discussionmentioning

confidence: 99%

Characterization of Black Sand Mining Activities and Their Environmental Impacts in the Philippines Using Remote Sensing

Chaussard

Kerosky

2016

Remote Sensing

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Abstract:Magnetite is a type of iron ore and a valuable commodity that occurs naturally in black sand beaches in the Philippines. However, black sand mining often takes place illegally and increases the likelihood and magnitude of geohazards, such as land subsidence, which augments the exposure of local communities to sea level rise and to typhoon-related threats. Detection of black sand mining activities traditionally relies on word of mouth, while measurement of their environmental effects requires on-the-ground geological surveys, which are precise, but costly and limited in scope. Here we show that systematic analysis of remote sensing data provides an objective, reliable, safe, and cost-effective way to monitor black sand mining activities and their impacts. First, we show that optical satellite data can be used to identify legal and illegal mining sites and characterize the direct effect of mining on the landscape. Second, we demonstrate that Interferometric Synthetic Aperture Radar (InSAR) can be used to evaluate the environmental impacts of black sand mining despite the small spatial extent of the activities. We detected a total of twenty black sand mining sites on Luzon Island and InSAR ALOS data reveal that out of the thirteen sites with coherence, nine experienced land subsidence at rates ranging from 1.5 to 5.7 cm/year during 2007-2011. The mean ground velocity map also highlights that the spatial extent of the subsiding areas is 10 to 100 times larger than the mining sites, likely associated with groundwater use or sediment redistribution. As a result of this subsidence, several coastal areas will be lowered to sea level elevation in a few decades and exposed to permanent flooding. This work demonstrates that remote sensing data are critical in monitoring the development of such activities and their environmental and societal impacts.

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Mississippi Delta subsidence primarily caused by compaction of Holocene strata

Cited by 452 publications

References 24 publications

Constraints on regional drivers of relative sea-level change around Cordova, Alaska

Constraints on regional drivers of relative sea-level change around Cordova, Alaska

Delta allometry: Growth laws for river deltas

Characterization of Black Sand Mining Activities and Their Environmental Impacts in the Philippines Using Remote Sensing

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