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논문 기본 정보

자료유형
학술저널
저자정보
Krvavica, Nino (Department of Hydrology and Hydraulic Engineering, Faculty of Civil Engineering, University of Rijeka) Kozar, Ivica (Department of Computer Modeling, Faculty of Civil Engineering, University of Rijeka) Ozanic, Nevenka (Department of Hydrology and Hydraulic Engineering, Faculty of Civil Engineering, University of Rijeka)
저널정보
테크노프레스 Coupled systems mechanics Coupled systems mechanics 제7권 제1호
발행연도
2018.1
수록면
95 - 109 (15page)

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The relevance of turbulent mixing in estuarine numerical models for stratified two-layer shallow water flows is analysed in this paper. A one-dimensional numerical model was developed for this purpose by extending an immiscible two-layer model with an additional source term, which accounts for turbulent mixing effects, namely the entrainment of fluid from the lower to the upper layer. The entrainment rate is quantified by an empirical equation as a function of the bulk Richardson number. A finite volume method based on an approximated Roe solver was used to solve the governing coupled system of partial differential equations. A comparison of numerical results with and without entrainment is presented to illustrate the influence of entrainment on both the salt-water intrusion length and lower layer dynamics. Furthermore, one example is given to demonstrate how entrainment terms may help to stabilize the numerical scheme and prevent a possible loss of hyperbolicity. Finally, the model with entrainment is validated by comparing the numerical results to field measurements.

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