DOI: 10.5194/hess-19-933-2015
Scopus记录号: 2-s2.0-84923164076
论文题名: From days to decades: Numerical modelling of freshwater lens response to climate change stressors on small low-lying islands
作者: Holding S ; , Allen D ; M
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2015
卷: 19, 期: 2 起始页码: 933
结束页码: 949
语种: 英语
Scopus关键词: Floods
; Sea level
; Solute transport
; Storms
; Water
; Different densities
; Flux-controlled
; Freshwater lens
; Future climate
; Hydrogeosphere
; Remedial actions
; Sea level rise
; Temporal and spatial scale
; Climate change
; carbonate
; climate change
; freshwater
; hurricane
; numerical model
; sea level change
; spatiotemporal analysis
; storm surge
; Andros [Bahamas]
; Atlantic Ocean
; Bahamas
; Caribbean Sea
; Pacific Ocean
英文摘要: Freshwater lenses on small islands are vulnerable to many climate change-related stressors, which can act over relatively long time periods, on the order of decades (e.g., sea level rise, changes in recharge), or short time periods, such as days (storm surge overwash). This study evaluates the response of the freshwater lens on a small low-lying island to various stressors. To account for the varying temporal and spatial scales of the stressors, two different density-dependent flow and solute transport codes are used: SEAWAT (saturated) and HydroGeoSphere (unsaturated/saturated). The study site is Andros Island in the Bahamas, which is characteristic of other low-lying carbonate islands in the Caribbean and Pacific regions. In addition to projected sea level rise and reduced recharge under future climate change, Andros Island experienced a storm surge overwash event during Hurricane Francis in 2004, which contaminated the main wellfield. Simulations of reduced recharge result in a greater loss of freshwater lens volume (up to 19%), while sea level rise contributes a lower volume loss (up to 5%) due to the flux-controlled conceptualization of Andros Island, which limits the impact of sea level rise. Reduced recharge and sea level rise were simulated as incremental instantaneous shifts. The lens responds relatively quickly to these stressors, within 0.5 to 3 years, with response time increasing as the magnitude of the stressor increases. Simulations of the storm surge overwash indicate that the freshwater lens recovers over time; however, prompt remedial action can restore the lens to potable concentrations up to 1 month sooner. © Author(s) 2015. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/78600
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Earth Sciences, Simon Fraser University, 8888 University Drive, Burnaby, BC, Canada
Recommended Citation:
Holding S,, Allen D,M. From days to decades: Numerical modelling of freshwater lens response to climate change stressors on small low-lying islands[J]. Hydrology and Earth System Sciences,2015-01-01,19(2)