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Shi Y.-B.,Zhejiang Institute of Hydraulics and Estuary | Shi Y.-B.,Key Laboratory of Estuarine and Coast of Zhejiang Province | Pan C.-H.,Zhejiang Institute of Hydraulics and Estuary | Pan C.-H.,Key Laboratory of Estuarine and Coast of Zhejiang Province | And 4 more authors.
Shuikexue Jinzhan/Advances in Water Science | Year: 2012

The estuarine reach of Qiantang River provides 85% fresh water supply to Hangzhou city. However, the estuarine water quality is threatened by salt water intrusion during spring tides of dry seasons. It is thus important to analyze the temporal-spatial variation of salt water intrusion and to develop a two-dimensional (2D) numerical model for the estuarine reach of Qiantang River. In this study, the temporal-spatial variation of salt water intrusion is analyzed using observed chloride profiles collected during spring tides. A 2D numerical model for coupled fluid flow with salinity transport is developed accordingly. The governing equations of the model are solved by an explicit finite-volume method with good conservation performance. The influence of river runoff and tidal current on salt water intrusion in the estuarine reach of Qiantang River is studied using the 2D numerical model. The result shows that both river runoff and tidal current have great influence on salt water intrusion in the estuarine reach. Countermeasures such as increasing discharge from the upstream Xin'an reservoir can effectively restrain the salt water intrusion and thus to reducing the chloride concentration and the over-standard time in estuarine waters. As a result, good water quality at the intakes can be maintained at the level of safe water supply.


Shi Y.-B.,Zhejiang Institute of Hydraulics and Estuary | Shi Y.-B.,Key Laboratory of Estuarine and Coast of Zhejiang Province | Pan C.-H.,Zhejiang Institute of Hydraulics and Estuary | Pan C.-H.,Key Laboratory of Estuarine and Coast of Zhejiang Province | And 4 more authors.
Shuili Xuebao/Journal of Hydraulic Engineering | Year: 2012

A two-dimensional movable-bed mathematical model with unstructured grid has been established to simulate sediment transport and riverbed deformation under dam-break flow over movable beds. The hydrodynamic model adopts water-sediment mixture flow equations, which consider the effects of sediment transport and bed deformation on the flow. The sediment model adopts the nonequilibrium transport of suspended load. The governing equations are solved by an explicit finite-volume method with the second-order Roe' scheme based approximate Riemann for intercell advection fluxes, and centre difference scheme with unstructured grid is adopted to compute diffusive fluxes. The model was tested by two examples with exact solution or experimental data on dam-break flow, with fairly good agreement between simulations and measurements or exact solution. Based on the verifications, the flow and sediment transport due to a dam failure were simulated respectively by means of this model. The result shows that dam-break flows over mobile beds can provoke very active sediment exchange between the water column and the bed, and it is quite necessary to simulate the flow and sediment transport process by means of coupled mathematical model.

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