Knowledge Resource Center for Ecological Environment in Arid Area
| DOI | 10.2172/5669318 |
| 报告编号 | ORNL-5976 |
| 来源ID | OSTI_ID: 5669318 |
| FEWA: a Finite Element model of Water flow through Aquifers | |
| Yeh, G.T.; Huff, D.D. | |
| 英文摘要 | This report documents the implementation and demonstration of a Finite Element model of Water flow through Aquifers (FEWA). The particular features of FEWA are its versatility and flexibility to deal with as many real-world problems as possible. Point as well as distributed sources/sinks are included to represent recharges/pumpings and rainfall infiltrations. All sources/sinks can be transient or steady state. Prescribed hydraulic head on the Dirichlet boundaries and fluxes on Neumann or Cauchy boundaries can be time-dependent or constant. Source/sink strength over each element and node, hydraulic head at each Dirichlet boundary node, and flux at each boundary segment can vary independently of each other. Either completely confined or completely unconfined aquifers, or partially confined and partially unconfined aquifers can be dealt with effectively. Discretization of a compound region with very irregular curved boundaries is made easy by including both quadrilateral and triangular elements in the formulation. Large-field problems can be solved efficiently by including a pointwise iterative solution strategy as an optional alternative to the direct elimination solution method for the matrix equation approximating the partial differential equation of groundwater flow. FEWA also includes transient flow through confining leaky aquifers lying above and/or below the aquifer of interest. The model is verified against three simple cases to which analytical solutions are available. It is then demonstrated by two examples of how the model can be applied to heterogeneous and anisotropic aquifers with transient boundary conditions, time-dependent sources/sinks, and confining aquitards for a confined aquifer of variable thickness and for a free surface problem in an unconfined aquifer, respectively. 20 references, 25 figures, 8 tables. |
| 出版年 | 1983 |
| 报告类型 | Technical Report |
| 语种 | 英语 |
| 国家 | 美国 |
| 来源学科分类 | 58 GEOSCIENCES ; 11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS ; AQUIFERS ; FLUID FLOW ; COMPUTER CODES ; F CODES ; FINITE ELEMENT METHOD ; GROUND WATER ; MATHEMATICAL MODELS ; HYDROGEN COMPOUNDS ; NUMERICAL SOLUTION ; OXYGEN COMPOUNDS ; WATER 580100* -- Geology & Hydrology-- (-1989) ; 053000 -- Nuclear Fuels-- Environmental Aspects |
| URL | http://www.osti.gov/scitech/servlets/purl/5669318 |
| 资源类型 | 科技报告 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/263536 |
| 推荐引用方式 GB/T 7714 | Yeh, G.T.,Huff, D.D.. FEWA: a Finite Element model of Water flow through Aquifers,1983. |
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