Time-variable gravity signal during the water impoundment of China's Three-Gorges Reservoir

Details Time-variable gravity signal during the water impoundment of China's Three-Gorges Reservoir Time-variable gravity signal during the water impoundment of China's Three-Gorges Reservoir

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29x..53b&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 24, pp. 53-1, CiteID 2200, DOI 10.1029/2002GL016457

Physics

3

Geodesy And Gravity: Ocean/Earth/Atmosphere Interactions (3339), Geodesy And Gravity: Planetary Geodesy And Gravity (5420, 5714, 6019), Geodesy And Gravity: Space Geodetic Surveys

Scientific paper

Beginning in 2003, China's Three-Gorges Reservoir will start water impoundment in phases. By 2009, it will be holding 40 km3 of water, flooding a stretch of middle Yangtze River about 600 km in length. The water impoundment process represents a geophysical ``controlled experiment'' offering a unique opportunity for detailed studies of a classical forward/inverse modeling problem of surface loading. While Wang [2000] studied the large loading effects on a local scale, we aim for longer spatial scales upwards from several hundred km, specially on the time-variable gravity signals that can be detected by the newly-launched GRACE satellite mission, whose 5-year lifetime (until 2007) will span the major impoundment period. Our results using the Green's function method adopting the PREM elastic Earth model indicate that the per-year geoid height increase is above the GRACE observational sensitivity out to harmonic degree 20, and to degree 50 (corresponding to a wavelength of 800 km) when integrated over the 5-year period.

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