Coastal subsidence monitoring typically employs Global Navigation Satellite System(GNSS)positioning technology.This method provides information only about subsidence below the station base.Sediments in coastal areas t...Coastal subsidence monitoring typically employs Global Navigation Satellite System(GNSS)positioning technology.This method provides information only about subsidence below the station base.Sediments in coastal areas tend to accumulate quickly,and subsidence can change significantly due to compaction and alluvium.Therefore,monitoring subsidence above the base is essential to obtain overall coastal subsidence.A new technology called GNSS-Interferometric Reflectometry(GNSS-IR)has been recently developed,which can utilize multipath effects to monitor reflector height.Since the base of the GNSS station is deep and the base length remains constant,the height changes measured by the GNSS-IR technology can reflect subsidence above the base.Accordingly,this paper employs GNSS-IR technology to measure subsidence changes above the base.Additionally,GNSS positioning technology is used to obtain subsidence changes below the base,and the overall subsidence change is then calculated using both GNSS-IR and GNSS positioning technology.The Mississippi River Delta,known for its significant sediment thickness,was selected as the study area,and data from FSHS,GRIS,and MSIN stations was analyzed.The results demonstrate that GNSS-IR can be used to measure the subsidence rate above the base,and the corrected overall subsidence rate is equivalent to the relative sea level rise rate.展开更多
Looking back at the developments in the past five years(2007-2012),the first is fermentation of the U.S.subprime mortgage crisis in 2007,which fused the outbreak of the international financial crisis in the following ...Looking back at the developments in the past five years(2007-2012),the first is fermentation of the U.S.subprime mortgage crisis in 2007,which fused the outbreak of the international financial crisis in the following year.The year 2008 is the year of real"turning point",on September 15th,the century-old Lehman Brothers on Wall Street closed down surprisingly and detonated the on-going financial crisis,the world then entered a展开更多
基金Fundamental Research Funds for the Central Universities(No.B200202015)National Natural Science Foundation of China(No.42004018)Natural Science Foundation of Jiangsu Province(No.BK20190496)。
文摘Coastal subsidence monitoring typically employs Global Navigation Satellite System(GNSS)positioning technology.This method provides information only about subsidence below the station base.Sediments in coastal areas tend to accumulate quickly,and subsidence can change significantly due to compaction and alluvium.Therefore,monitoring subsidence above the base is essential to obtain overall coastal subsidence.A new technology called GNSS-Interferometric Reflectometry(GNSS-IR)has been recently developed,which can utilize multipath effects to monitor reflector height.Since the base of the GNSS station is deep and the base length remains constant,the height changes measured by the GNSS-IR technology can reflect subsidence above the base.Accordingly,this paper employs GNSS-IR technology to measure subsidence changes above the base.Additionally,GNSS positioning technology is used to obtain subsidence changes below the base,and the overall subsidence change is then calculated using both GNSS-IR and GNSS positioning technology.The Mississippi River Delta,known for its significant sediment thickness,was selected as the study area,and data from FSHS,GRIS,and MSIN stations was analyzed.The results demonstrate that GNSS-IR can be used to measure the subsidence rate above the base,and the corrected overall subsidence rate is equivalent to the relative sea level rise rate.
文摘Looking back at the developments in the past five years(2007-2012),the first is fermentation of the U.S.subprime mortgage crisis in 2007,which fused the outbreak of the international financial crisis in the following year.The year 2008 is the year of real"turning point",on September 15th,the century-old Lehman Brothers on Wall Street closed down surprisingly and detonated the on-going financial crisis,the world then entered a
