DOI: 10.5194/hess-18-227-2014
Scopus记录号: 2-s2.0-84892698199
论文题名: Representation of water abstraction from a karst conduit with numerical discrete-continuum models
作者: Reimann T ; , Giese M ; , Geyer T ; , Liedl R ; , Maréchal J ; C ; , Shoemaker W ; B
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2014
卷: 18, 期: 1 起始页码: 227
结束页码: 241
语种: 英语
Scopus关键词: Fixed-head boundary
; Groundwater storage
; Hydraulic behavior
; ITS applications
; Permeability contrasts
; Quasi-steady-state flow
; Storage volumes
; Water abstraction
; Abstracting
; Aquifers
; Boundary conditions
; Confined flow
; Continuum mechanics
; Hydrogeology
; Water conservation
; Landforms
; aquifer
; groundwater abstraction
; hydrological modeling
; inflow
; karst hydrology
; numerical model
; steady-state equilibrium
; water storage
英文摘要: Karst aquifers are characterized by highly conductive conduit flow paths embedded in a less conductive fissured and fractured matrix, resulting in strong permeability contrasts with structured heterogeneity and anisotropy. Groundwater storage occurs predominantly in the fissured matrix. Hence, most mathematical karst models assume quasi-steady-state flow in conduits neglecting conduit-associated drainable storage (CADS). The concept of CADS considers storage volumes, where karst water is not part of the active flow system but hydraulically connected to conduits (for example karstic voids and large fractures). The disregard of conduit storage can be inappropriate when direct water abstraction from karst conduits occurs, e.g., large-scale pumping. In such cases, CADS may be relevant. Furthermore, the typical fixed-head boundary condition at the karst outlet can be inadequate for water abstraction scenarios because unhampered water inflow is possible. The objective of this work is to analyze the significance of CADS and flow-limited boundary conditions on the hydraulic behavior of karst aquifers in water abstraction scenarios. To this end, the numerical discrete-continuum model MODFLOW-2005 Conduit Flow Process Mode 1 (CFPM1) is enhanced to account for CADS. Additionally, a fixed-head limited-flow (FHLQ) boundary condition is added that limits inflow from constant head boundaries to a user-defined threshold. The effects and the proper functioning of these modifications are demonstrated by simplified model studies. Both enhancements, CADS and FHLQ boundary, are shown to be useful for water abstraction scenarios within karst aquifers. An idealized representation of a large-scale pumping test in a karst conduit is used to demonstrate that the enhanced CFPM1 is able to adequately represent water abstraction processes in both the conduits and the matrix of real karst systems, as illustrated by its application to the Cent Fonts karst system. © 2014 Author(s). CC Attribution 3.0 License. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/78348
Appears in Collections: 气候变化事实与影响
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作者单位: Institute for Groundwater Management, TU Dresden, Dresden, Germany; Geoscientific Centre, University of Göttingen, Göttingen, Germany; Bureau de Recherches Géologiques et Minières (B.R.G.M.), Montpellier, France; 8307 Balgowan Road, Miami Lakes, FL 33016, United States
Recommended Citation:
Reimann T,, Giese M,, Geyer T,et al. Representation of water abstraction from a karst conduit with numerical discrete-continuum models[J]. Hydrology and Earth System Sciences,2014-01-01,18(1)