【摘要】 三峡工程三期截流具有流量大、落差大、龙口流速大等特点。为保证截流顺利实施,将一维和二维水流数学模型紧密结合,先用一维模型推求明渠的过流量及上下游戗堤承担的水位落差,再用二维模型模拟戗堤进占时明渠内的水力条件。然后利用已有的水工模型试验资料,对建立的数学模型进行了率定。率定结果表明:一维模型计算的明渠过流量、截流总落差、上下游戗堤承担的水位落差等结果与试验值相当接近;二维模型的计算结果不仅与试验值基本符合,同时又符合弯道水力学的基本特点。更多还原

【Abstract】 The TGP’s third-stage open channel closure is characterized by large closure discharge, large closure water-head, and large opening velocity. In order to carry out the construction of open channel closure favorably, 1D and 2D flow mathematical models were developed and integrated. The discharge inflowing the open channel and water heads shared by the upstream and downstream closure dikes can be computed through using 1D flow model, and the detailed hydraulic conditions in the open channel during closure can be calculated through using 2D flow model. Then, the developed flow models were calibrated by the data from the physical model experiment. The calibrated results showed that 1D results of the discharge through the open channel, the total water-head and the water-heads shared by the upstream and downstream dikes were in agreement with the experimental data, that 2D results also agreed with the test data and corresponded with the characteristic of flow in a meandering river.更多还原