Two-dimensional Numerical Simulation and Its Application of Water Transfer in Nansi Lake of South-to-north Water Transfer Project
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Abstract:
Due to the complex terrain changes and characteristics of Nansi Lake Basin, the reliability of water transfer project can be affected if the traditional one-dimensional total flow method is used in the hydraulic calculation of dredging project in the lake. In this study, a depth-averaged two-dimensional mathematical flow model system of Nansi Lake was created and verified on the basis of 1/10000 scale topographic map (CAD version) and satellite remote sensing images of Nansi Lake. Under the conditions of design water transfer scheme, the flow fields of the upper and lower Nansi Lake were simulated using the two-dimensional mathematical model. The dredging program with the smallest amount of excavation was determined in order to meet the requirements of water level at control locations under both normal design and special drought conditions. Analysis of the flow field results indicated that the flow field in the whole lake, both in the upper and lower lakes, showed solo-directional feature from south to north during the process of water transfer. The average flow velocity in the main channel was 0.12 m/s, generally about one order of magnitude higher than that in the non-main channel regions. The main channel of Nansi Lake played the major role in water transfer as its average flow rate accounted for 61.5% of the total flow rate and its maximum capability can reach 88.9%.
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