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Titolo:
COMPARISON OF NEAR-FIELD MIXING ZONE MODELS FOR MULTIPORT DIFFUSERS IN THE GREAT-LAKES
Autore:
TSANIS IK; VALEO C; DIAO Y;
Indirizzi:
MCMASTER UNIV,DEPT CIVIL ENGN HAMILTON L8S 4L7 ONTARIO CANADA TONGJI UNIV,DEPT ENGN MECH SHANGHAI 200092 PEOPLES R CHINA
Titolo Testata:
Canadian journal of civil engineering
fascicolo: 1, volume: 21, anno: 1994,
pagine: 141 - 155
SICI:
0315-1468(1994)21:1<141:CONMZM>2.0.ZU;2-W
Fonte:
ISI
Lingua:
ENG
Soggetto:
MARINE OUTFALL DESIGN; INITIAL DILUTION; HYDRODYNAMIC CLASSIFICATION; COMPUTER-MODELS; BUOYANT JETS; OCEAN; DISCHARGES; FLUID; DISPERSION; PLUME;
Keywords:
MIXING ZONE; MULTIPORT DIFFUSERS; INITIAL DILUTION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
73
Recensione:
Indirizzi per estratti:
Citazione:
I.K. Tsanis et al., "COMPARISON OF NEAR-FIELD MIXING ZONE MODELS FOR MULTIPORT DIFFUSERS IN THE GREAT-LAKES", Canadian journal of civil engineering, 21(1), 1994, pp. 141-155

Abstract

This paper presents a review of near-field mixing zone models and compares their performance with common outfall diffuser examples in the Great Lakes. The results of initial dilutions for three types of multiport diffusers, based on the Ontario Ministry of Environment (MOE) guidelines and recommendations, are compared with those calculated by using the U.S. Environmental Protection Agency (EPA) models. These models include five integral-type models (UPLUME, UOUTPLM, UDKHDEN, UMERGE, and ULINE) and a ''length scale'' type expert system (CORMIX2). Resultsbased on the first four EPA integral models give higher initial dilutions when compared to results based on CORMIX2 and the MOE guidelines. ULINE gives unrealistically low dilutions. Excluding UPLUME, the initial dilutions given by the other EPA models increase with increasing ambient current. Alternating diffusers generally give lower initial dilutions than the staged and unidirectional diffusers, while unidirectional diffusers produce the highest of the three. Results from the computation tests based on the mixing models can aid in more reasonable andeconomical diffuser designs that still meet the requirement of initial dilution criteria. While all the models selected for this study havelimitations, CORMIX2 is preferred for most Great Lakes applications. It can be applied to all four types of multiport diffusers and can handle different types of ambient stratification, bottom and shore attachment, wake effects and dead zones, plume trapping and far-field behaviour. CORMIX2 predictions compare well with laboratory data and very limited field data. Given the complexity of the problem, more field studies should be performed for further validation of the models.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 14/08/20 alle ore 15:59:46