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平原感潮河网区水流计算复杂,边界条件需考虑入江口潮位的影响,同时流域内闸坝调度工况对水流运动状态影响显著,是区域防洪调度中亟需解决的问题之一。以秦淮河流域为例,利用Landsat遥感技术提取了流域下垫面因素,建立了丘陵—平原产汇流模型,考虑了秦淮河入江口的潮位关系和流域内水库、闸门的调度情况,利用河网水动力学模型模拟计算了流域内各重要节点的水位过程。结果表明,本文模型对较大暴雨洪水年份1991、2003、2007年洪水的模拟能力较好,主要断面最高水位模拟误差均控制在0.15m以内。
The calculation of flow in plain tidal river network area is complicated. The boundary conditions need to consider the influence of tidal level in the estuary, and the influence of sluice dam operating conditions on flow movement is significant, which is one of the most urgent problems to be solved in regional flood control. Taking Qinhuai River Basin as an example, the Landsat remote sensing technique was used to extract the underlying surface factors of the watershed, and a model of hilly-plain convergence was established. Considering the relationship between the tidal level at the inlet of Qinhuai River and the reservoir and gate in the basin, The hydrodynamic model simulates and calculates the water level process of each important node in the basin. The results show that the proposed model has a good ability to simulate floods in 1991, 2003 and 2007 with a larger storm flood. The simulation error of the maximum water level in the major sections is controlled within 0.15m.