DOI: 10.5194/hess-22-221-2018
Scopus记录号: 2-s2.0-85040616160
论文题名: Numerical modeling and sensitivity analysis of seawater intrusion in a dual-permeability coastal karst aquifer with conduit networks
作者: Xu Z ; , Hu B ; X ; , Ye M
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2018
卷: 22, 期: 1 起始页码: 221
结束页码: 239
语种: 英语
Scopus关键词: Aquifers
; Boundary conditions
; Confined flow
; Electric conduits
; Flow of fluids
; Flow velocity
; Groundwater
; Groundwater pollution
; Groundwater resources
; Hydraulic conductivity
; Hydrogeology
; Landforms
; Mercury (metal)
; Porous materials
; Rain
; Salt water intrusion
; Sea level
; Seawater
; Seawater effects
; Submarines
; Density dependent flow
; Global sensitivity analysis
; Groundwater contaminants
; Hydrological characteristics
; Local sensitivity analysis
; Non-linear relationships
; Parameter interactions
; Parameter sensitivities
; Sensitivity analysis
; aquifer
; boundary condition
; coastal zone
; flow velocity
; groundwater pollution
; hydraulic conductivity
; karst
; modeling
; numerical model
; rainfall
; saline intrusion
; sea level change
; sensitivity analysis
英文摘要: Long-distance seawater intrusion has been widely observed through the subsurface conduit system in coastal karst aquifers as a source of groundwater contaminant. In this study, seawater intrusion in a dual-permeability karst aquifer with conduit networks is studied by the two-dimensional density-dependent flow and transport SEAWAT model. Local and global sensitivity analyses are used to evaluate the impacts of boundary conditions and hydrological characteristics on modeling seawater intrusion in a karst aquifer, including hydraulic conductivity, effective porosity, specific storage, and dispersivity of the conduit network and of the porous medium. The local sensitivity analysis evaluates the parameters' sensitivities for modeling seawater intrusion, specifically in the Woodville Karst Plain (WKP). A more comprehensive interpretation of parameter sensitivities, including the nonlinear relationship between simulations and parameters, and/or parameter interactions, is addressed in the global sensitivity analysis. The conduit parameters and boundary conditions are important to the simulations in the porous medium because of the dynamical exchanges between the two systems. The sensitivity study indicates that salinity and head simulations in the karst features, such as the conduit system and submarine springs, are critical for understanding seawater intrusion in a coastal karst aquifer. The evaluation of hydraulic conductivity sensitivity in the continuum SEAWAT model may be biased since the conduit flow velocity is not accurately calculated by Darcy's equation as a function of head difference and hydraulic conductivity. In addition, dispersivity is no longer an important parameter in an advection-dominated karst aquifer with a conduit system, compared to the sensitivity results in a porous medium aquifer. In the end, the extents of seawater intrusion are quantitatively evaluated and measured under different scenarios with the variabilities of important parameters identified from sensitivity results, including salinity at the submarine spring with rainfall recharge, sea level rise, and a longer simulation time under an extended low rainfall period. © Author(s) 2018. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/79429
Appears in Collections: 气候变化事实与影响
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作者单位: Climate and Ecosystem Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, United States; Institute of Groundwater and Earth Sciences, Jinan University, Guangzhou, Guangdong, China; Department of Earth, Ocean and Atmospheric Science, Florida State University, Tallahassee, FL, United States
Recommended Citation:
Xu Z,, Hu B,X,et al. Numerical modeling and sensitivity analysis of seawater intrusion in a dual-permeability coastal karst aquifer with conduit networks[J]. Hydrology and Earth System Sciences,2018-01-01,22(1)