Impact of Water Impoundment of Large Reservoirs on Spatial Variation of Coastal Relative Sea Level in Cgina
Wang Linsong
Chen Chao
Du Jinsong
Wang Qiuge
Sun Shida
Abstract：The spatial-temporal characteristics of water impoundment of large reservoirs in China are analyzed in this study.The results show that 697 km3 of water has been impounded in the large reservoirs since 1950,which amounts to 83.3%and 6.5%of the total reservoir storage capacity in China and the whole world,respectively.The numbers of large reservoirs and water storage capacity have been accelerating since 2000,and rate of the capacity change is 16.7 km3/a,much higher than the increase from 1950 to 2000 at 4.9 km3/a .Meanwhile,terrestrial water storage in the south of the Yangtze River basin is esti-mated by using satellite gravity data by the Gravity Recovery and Climate Experiment (GRACE)after 2000,showing that the estimate by GRACE is only 63%of total reservoir volume changes,and the difference between GRACE and real reservoir stor-age variations suggests a long-term trend of groundwater in this area.Based on location and capacity of the large reservoirs and sea level equation,the dam-induced spatial distributions of coastal relative sea level (RSL)are calculated.The results depict that the RSL caused the water impounded behind dams rise most quickly in the Bohai Sea and southeast coastal areas,and the maximum of the RSL is approximately about 8 mm.Besides,impact of the water impoundment on the RSL mainly concentrates in the southeast coast,where the rise of the RSL is approximately about 2 to 3 mm since 2000.And the rising rate of the RSL in the China coastal tide gauge locations is 0.02-0.11 mm/a.
Keywords：water impoundment of large reservoircapacity spatial and temporal distributioncoastal relative sea leveltide gaugegeophysics
Publication Date：2014-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：10( 1607-1616 )