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5 results on '"funnel-and-gate system"'

2. Algorithmic funnel-and-gate system design optimization.

Author

Bürger, Claudius M., Bayer, Peter, and Finkel, Michael

Abstract

Funnel-and-gate systems (FGSs), which constitute a common variant of permeable reactive barriers used for in situ treatment of groundwater, pose particular challenges to the task of design optimization. Because of the complex interplay of funnels and gates, the evolutionary algorithms applied have to cope with multimodality, nonseparability, and nonlinearity of the optimization task. We analyze these features in a test case, introducing an objective function for design cost and constraints to account for plume capture and detention time in the gate reactors. We show that the derandomized evolution strategy with covariance matrix adaptation (CMA-ES) does solve the given design optimization problem with high success rates. We further examine the performance of the algorithm for the example of four-gate systems in three heterogeneous template aquifers. Here a special focus is set on the parameterization of the FGS (i.e., the problem encoding). The comparison of three different encodings reveals their significance concerning the search progress and its success. Among the found optimal and near-optimal design solutions, mutual patterns were recognized. In particular, a large central barrier seems to be a superior feature. [ABSTRACT FROM AUTHOR]

Published
2007
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3. Evaluation of the Performance of Permeable Reactive Barriers for Contaminated Groundwater Remediation

Author

Katsumi, Takeshi, Ishimori, Hiroyuki, ENDO, Kazuto, Kamon, Masashi, and Fukagawa, Ryoichi

Subjects
FEM, groundwater, remediation, 最適化問題, 浸透流解析, Capture Zone, 反応透過壁, Retention Time, seepage analysis, funnel-and-gate system
Abstract

土壌・地下水汚染対策工法の反応透過壁工法(反応性バリア)を対象として，その設計パラメータを平面2次元浸透流解析により評価した。その結果に基づき，汚染サイトの特性に応じた最適な反応透過壁構造を見出すことができる設計手法を提案した。汚染サイトを正常に浄化することのできる条件を満たし，なおかつ施工費用が最小になるという視点から最適な反応透過壁構造を議論した。, Performance of permeable reactive barriers for contaminated groundwater remediation was evaluated using FEM seepage analysis. The retention time and the capture zone were calculated on the funnel-and-gate systems (FGSs) having different geometries, in order to evaluate the effects of these geometries on the FGSs performance. Based on the calculated results, costs associated with the installation of funnel-and-gate systems satisfying a certain performance were obtained to estimate the cost-effective geometry. Finally, optimum design flow for FGS was proposed.

Published
2002

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Author

Katsumi, Takeshi, Ishimori, Hiroyuki, ENDO, Kazuto, Kamon, Masashi, Fukagawa, Ryoichi, Katsumi, Takeshi, Ishimori, Hiroyuki, ENDO, Kazuto, Kamon, Masashi, and Fukagawa, Ryoichi

Abstract

Performance of permeable reactive barriers for contaminated groundwater remediation was evaluated using FEM seepage analysis. The retention time and the capture zone were calculated on the funnel-and-gate systems (FGSs) having different geometries, in order to evaluate the effects of these geometries on the FGSs performance. Based on the calculated results, costs associated with the installation of funnel-and-gate systems satisfying a certain performance were obtained to estimate the cost-effective geometry. Finally, optimum design flow for FGS was proposed.

Published
2002

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