Meeting:Abstract 2013 CSDMS meeting-071: Difference between revisions

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|CSDMS meeting first name=Stephanie
|CSDMS meeting first name=Stephanie
|CSDMS meeting last name=Higgins
|CSDMS meeting last name=Higgins
|CSDMS meeting institute=INSTAAR
|CSDMS meeting institute=CSDMS/INSTAAR
|CSDMS meeting city=Boulder
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|CSDMS meeting country=United States
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|CSDMS meeting coauthor first name abstract=Irina
|CSDMS meeting coauthor first name abstract=Irina
|CSDMS meeting coauthor last name abstract=Overeem
|CSDMS meeting coauthor last name abstract=Overeem
|CSDMS meeting coauthor institute / Organization=INSTAAR/CSDMS
|CSDMS meeting coauthor institute / Organization=CSDMS/INSTAAR
|CSDMS meeting coauthor town-city=Boulder
|CSDMS meeting coauthor country=United States
|CSDMS meeting coauthor country=United States
|State=Colorado
|State=Colorado
|CSDMS meeting coauthor email address=irina.overeem@colorado.edu
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|CSDMS meeting coauthor institute / Organization=AIST  
|CSDMS meeting coauthor institute / Organization=AIST  
|CSDMS meeting coauthor country=Japan
|CSDMS meeting coauthor country=Japan
|CSDMS meeting coauthor email address=akiko-tanaka@aist.go.jp
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|CSDMS meeting coauthor first name abstract=James
|CSDMS meeting coauthor first name abstract=James
|CSDMS meeting coauthor last name abstract=Syvitski
|CSDMS meeting coauthor last name abstract=Syvitski
|CSDMS meeting coauthor institute / Organization=INSTAAR/CSDMS
|CSDMS meeting coauthor institute / Organization=CSDMS/INSTAAR
|CSDMS meeting coauthor town-city=Boulder
|CSDMS meeting coauthor town-city=Boulder
|CSDMS meeting coauthor country=United States
|CSDMS meeting coauthor country=United States
|State=Colorado
|State=Colorado
|CSDMS meeting coauthor email address=james.syvitski@colorado.edu
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|CSDMS meeting abstract=Many of the world’s deltas are subsiding [1-4], destabilizing infrastructure, heightening storm surges, inducing groundwater salinization, intensifying river flooding, and accelerating shoreline retreat. Though a half-billion people live on deltas [5], subsidence rates remain poorly constrained, because vertical deformation records from tide gauges, extensometers or GPS devices are rare in deltas, and provide only point measures of ground motion. Moreover, deltas typically experience many concurrent pressures that are difficult to distinguish from one another in practice. These pressures include groundwater pumping, hydrocarbon extraction, sediment compaction, and tectonic or isostatic motion. China’s Yellow River delta is a large, densely populated delta that is experiencing all known drivers of subsidence simultaneously. To examine rates and patterns of ground motion in the delta, we apply Differential Synthetic Aperture Radar Interferometry (D-InSAR) covering the years 2007 - 2011. We find coastal aquaculture and salt production facilities sinking up to 220 mm/y, likely due to groundwater pumping. These rates exceed local (2–5 mm/y) and global average (3.1 mm/y) sea level rise by nearly two orders of magnitude [6,7]. Considering the explosive growth of aquaculture in the last two decades, and the similarity of the Yellow to many other deltas, this result has serious implications for coastal management and sustainability.  
|CSDMS meeting abstract=While many researchers have mapped and tracked coastal erosion in the Yellow River Delta, determining its cause has proven nearly impossible, because myriad natural and anthropogenic processes are simultaneously affecting the delta. These processes include reduced sediment supply, reduced river discharge, changing tide and current patterns, new seawalls, groundwater withdrawal, substrate compaction, oil extraction, burgeoning urban centers, and rising sea level. Here, we use Interferometric Synthetic Aperture Radar (InSAR) to map surface deformation in the delta between the years 2007 and 2011. We find that rapid, localized subsidence of up to 22 cm/y is occurring along the coast, apparently related to groundwater extraction at aquaculture facilities. This finding has important consequences for the sustainability of the local aquaculture industry. Similar subsidence may also be occurring in deltas like the Mekong, though these signals may be difficult or impossible to measure.  
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CSDMS all hands meeting 2013

Land Subsidence at Aquaculture Facilities in the Yellow River Delta, China

Stephanie Higgins, CSDMS/INSTAAR Boulder Colorado, United States. stephanie.higgins@colorado.edu
Irina Overeem, CSDMS/INSTAAR Colorado, United States.
Akiko Tanaka, AIST , Japan.
James Syvitski, CSDMS/INSTAAR Boulder Colorado, United States.


[[Image:|300px|right|link=File:]]While many researchers have mapped and tracked coastal erosion in the Yellow River Delta, determining its cause has proven nearly impossible, because myriad natural and anthropogenic processes are simultaneously affecting the delta. These processes include reduced sediment supply, reduced river discharge, changing tide and current patterns, new seawalls, groundwater withdrawal, substrate compaction, oil extraction, burgeoning urban centers, and rising sea level. Here, we use Interferometric Synthetic Aperture Radar (InSAR) to map surface deformation in the delta between the years 2007 and 2011. We find that rapid, localized subsidence of up to 22 cm/y is occurring along the coast, apparently related to groundwater extraction at aquaculture facilities. This finding has important consequences for the sustainability of the local aquaculture industry. Similar subsidence may also be occurring in deltas like the Mekong, though these signals may be difficult or impossible to measure.


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