Dredging for dilution: A simulation based case study in a Tidal River.
A 2-D hydrodynamic finite element model with a Lagrangian particle module is used to investigate the effects of dredging on the hydrodynamics and the horizontal dilution of pollutant particles originating from a wastewater treatment facility (WWTF) in tidal Oyster River in New Hampshire, USA. The mo...
| Published in: | Journal of Environmental Management Vol. 167; pp. 85 - 99 |
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| Main Authors: | , , |
| Format: | Case Study |
| Published: |
Academic Press Inc.
Feb2016
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| Subjects: | |
| Online Access: | View this record in EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ssf&AN=111976838&site=ehost-live header: @attributes: shortDbName: ssf uiTerm: 111976838 longDbName: Social Sciences Full Text (H.W. Wilson) uiTag: AN controlInfo: bkinfo: jinfo: jid: 03014797 EMJ jtl: Journal of Environmental Management issn: 03014797 maglogo: N pubinfo: dt: Feb2016 vid: 167 pid: 735 pub: Academic Press Inc. artinfo: ui: 111976838 10.1016/j.jenvman.2015.11.008 ppf: 85 ppct: 14 formats: tig: atl: Dredging for dilution: A simulation based case study in a Tidal River. aug: au: Bilgili, Ata Proehl, Jeffrey A. Swift, M. Robinson affil: Istanbul Technical University, Istanbul 34940, Turkey JAProehl Consulting, Cornish, NH 03745, USA University of New Hampshire, Durham, NH 03824, USA su: Pollutants Finite element method Lagrangian functions Hydrodynamics Wastewater treatment Random walks sug: subj: Pollutants Sewage Treatment Facilities Finite element method Lagrangian functions Hydrodynamics Wastewater treatment Random walks keyword: Dilution Dredging Lagrangian particle tracking Numerical modeling Pollutant Tides Waste water Dilution Dredging Lagrangian particle tracking Numerical modeling Pollutant Tides Waste water ab: A 2-D hydrodynamic finite element model with a Lagrangian particle module is used to investigate the effects of dredging on the hydrodynamics and the horizontal dilution of pollutant particles originating from a wastewater treatment facility (WWTF) in tidal Oyster River in New Hampshire, USA. The model is driven by the semi-diurnal (M 2 ) tidal component and includes the effect of flooding and drying of riverine mud flats. The particle tracking method consists of tidal advection plus a horizontal random walk model of sub-grid scale turbulent processes. Our approach is to perform continuous pollutant particle releases from the outfall, simulating three different scenarios: a base-case representing the present conditions and two different dredged channel/outfall location configurations. Hydrodynamics are investigated in an Eulerian framework and Lagrangian particle dilution improvement ratios are calculated for all cases. Results show that the simulated hydrodynamics are consistent with observed conditions. Eulerian and Lagrangian residuals predict an outward path suggesting flushing of pollutants on longer (>M 2 ) time scales. Simulated dilution maps show that, in addition to dredging, the relocation of the WWTF outfall into the dredged main channel is required for increased dilution performance. The methodology presented here can be applied to similar managerial problems in all similar systems worldwide with relatively little effort, with the combination of Lagrangian and Eulerian methods working together towards a better solution. The statistical significance brought into methodology, by using a large number of particles (16000 in this case), is to be emphasized, especially with the growing number of networked parallel computer clusters worldwide. This paper improves on the study presented in Bilgili et al., 2006b, by adding an Eulerian analysis. pubtype: Academic Journal doctype: Case Study src: R language: English refInfo: copyright: @attributes: flag: N holdings: @attributes: islocal: N |
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