DOI: 10.1016/j.gloplacha.2013.10.002
论文题名: Quantifying rates of coastal subsidence since the last interglacial and the role of sediment loading
作者: Simms A.R. ; Anderson J.B. ; DeWitt R. ; Lambeck K. ; Purcell A.
刊名: Global and Planetary Change
ISSN: 0921-8201
出版年: 2013
卷: 111 起始页码: 296
结束页码: 308
语种: 英语
英文关键词: Barrier island
; GIS
; Gulf of Mexico
; Ingleside
; Interglacial
; Isostasy
; Marine isotope stage 5e
; Pleistocene
; Sea level
Scopus关键词: Barrier island
; Gulf of Mexico
; Ingleside
; Interglacial
; Isostasy
; Marine isotope stages
; Pleistocene
; Geochronology
; Geographic information systems
; Glacial geology
; Isotopes
; Luminescence
; Sea level
; Sediments
; Subsidence
; Loading
; coastal zone
; digital elevation model
; geomorphology
; GIS
; interglacial
; isostasy
; luminescence
; magnitude
; numerical model
; Pleistocene
; sea level change
; shoreline
; spatial variation
; subsidence
; tectonics
; Atlantic Ocean
; Australia
; Colorado Delta
; Coral Sea
; Great Barrier Reef
; Gulf of Mexico
; Mexico [North America]
; Pacific Ocean
; Queensland
; Texas Shelf
英文摘要: The rate of sea-level rise is expected to increase over the next century. In many areas, increasing rates of sea-level rise are exacerbated by subsidence. In order to develop proper mitigation strategies for coastal change, better estimates for the rates of subsidence are needed. In this study we outline a strategy for calculating long-term subsidence rates for coastlines based on the differential elevations of modern shorelines and their last interglacial (LIG) equivalent geomorphic features. We apply this strategy to the LIG shoreline of the USA Texas coast. We first obtained optically stimulated luminescence ages of features long conjectured to be LIG, but, until now have remained undated. We use a digital elevation model to calculate the difference in elevations between the modern and MIS5e shorelines. This difference is corrected for glacial-hydro-isostatic adjustments to the Texas coast over the last 120. ky. Our analysis shows spatial variability in the rate of subsidence that increases seaward and at locations closer to the Brazos/Colorado delta. The lowest rates of subsidence were 0.03. mm/yr at the most inland site. The highest rates were 0.09. mm/yr near the modern Brazos/Colorado Delta. The spatial pattern of subsidence suggests that most of the long-term vertical motion along the Texas coast is due to sediment loading. The rates of subsidence along the portions of the Texas coast are equal to, and in some places greater than, glacial-isostatic adjustments (GIA), thus highlighting the importance of other vertical motions such as sediment loading when using sea-level data to constrain GIA models even in the absence of active tectonics. In addition, these rates are two orders of magnitude less than modern rates of relative sea-level rise recorded at tide gauges along the Texas coast, highlighting the importance of Holocene compaction and fluid withdrawal in accelerating rates of subsidence along the Texas coast. © 2013 Elsevier B.V. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84886996787&doi=10.1016%2fj.gloplacha.2013.10.002&partnerID=40&md5=39e56db100c3b9b82feb66ea5ff07fe2
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/11107
Appears in Collections: 全球变化的国际研究计划
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作者单位: Department of Earth Science, University of Californiam, Santa Barbara, 1006 Webb Hall, Santa Barbara, CA 93106, United States
Recommended Citation:
Simms A.R.,Anderson J.B.,DeWitt R.,et al. Quantifying rates of coastal subsidence since the last interglacial and the role of sediment loading[J]. Global and Planetary Change,2013-01-01,111.