標題: Time-varying land subsidence detected by radar altimetry: California, Taiwan and north China
作者: Hwang, Cheinway
Yang, Yuande
Kao, Ricky
Han, Jiancheng
Shum, C. K.
Galloway, Devin L.
Sneed, Michelle
Hung, Wei-Chia
Cheng, Yung-Sheng
Li, Fei
土木工程學系
Department of Civil Engineering
公開日期: 21-Jun-2016
摘要: Contemporary applications of radar altimetry include sea-level rise, ocean circulation, marine gravity, and icesheet elevation change. Unlike InSAR and GNSS, which are widely used to map surface deformation, altimetry is neither reliant on highly temporally-correlated ground features nor as limited by the available spatial coverage, and can provide long-term temporal subsidence monitoring capability. Here we use multi-mission radar altimetry with an approximately 23 year data-span to quantify land subsidence in cropland areas. Subsidence rates from TOPEX/POSEIDON, JASON-1, ENVISAT, and JASON-2 during 1992-2015 show time-varying trends with respect to displacement over time in California's San Joaquin Valley and central Taiwan, possibly related to changes in land use, climatic conditions (drought) and regulatory measures affecting groundwater use. Near Hanford, California, subsidence rates reach 18 cm yr(-1) with a cumulative subsidence of 206 cm, which potentially could adversely affect operations of the planned California High-Speed Rail. The maximum subsidence rate in central Taiwan is 8 cm yr(-1). Radar altimetry also reveals time-varying subsidence in the North China Plain consistent with the declines of groundwater storage and existing water infrastructure detected by the Gravity Recovery And Climate Experiment (GRACE) satellites, with rates reaching 20 cm yr(-1) and cumulative subsidence as much as 155 cm.
URI: http://dx.doi.org/10.1038/srep28160
http://hdl.handle.net/11536/133926
ISSN: 2045-2322
DOI: 10.1038/srep28160
期刊: SCIENTIFIC REPORTS
Volume: 6
起始頁: 0
結束頁: 0
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