沈阳农业大学学报2017，Vol.48Issue(5)：576-583,8.DOI:10.3969/j.issn.1000-1700.2017.05.009
荆江—洞庭湖河网一二维嵌套水动力学模型研究
The 1-2D Coupled Hydrodynamic Model of Jingjiang-Dongting Lake
摘要
Abstract
The river system of Jingjiang-Dongting Lake is characterized for its complicated spatiotemporal variation in hydrological process, which has a significant impact on the flood control system of the Yangtze River. A new adjustment occurred in the trunk stream of Jingjiang and its diversion process after operation of the Three Gorges Reservoir. Therefore, the original flood control situation also has been changed to some extent. In order to cope with the related change in river system of Jingjiang River and Dongting Lake, it is necessary to simulate various complicated water flow processes in the system. In this study, 1-2D nested hydrodynamic model was established in the Jingjiang-Dongting Lake area. The 1D and 2D hydrodynamic models were applied to river network and Dongting Lake area respectively. The 1D and 2D models were connected through water exchange across the boundary interface, in other words, the 1D model provided the upstream flow boundary for the 2D model. On the contrary, the 2D model provided downstream water level boundary for the 1D model. According to the principle of equal-boundary hydraulics, the iterative calculation could be realized by transferring physical quantity to each other in the models. The nested hydrodynamic model was calibrated by the measured data from Jianli and Luoshan stations in the JingjiangRiver, Xinjiangkou, Shadaoguan, Mituosi stations in the distributary channels and the Lujiao Station in the Dongting Lake area in 2008. The model was validated by the measured data in Aug. ~ Nov. of 2012. At the same time, the flow field in Dongting Lake was simulated during wet and dry periods. The main flow direction on the Lake surface is from Pinghu Lake to South Dongting Lake, then East Dongting Lake, and finally flowing into the Yantze River at Chenglingji. The water is almost replaced in wet period, however, "stagnant water" phenomenon is obvious in dry period. The validated values of water level, discharge and velocity from the model indicated that the simulation results well fitted with the measured data in the trunk stream of Jingjiang, distributary channels and lake area. The calibrated bed resistance and technical parameters were reasonable with high accuracy in the nested model, and the model could accurately simulate the flow movement and compute the different flood processes in the Jingjiang-Dongting Lake area. The model could provide an important reference for the prediction of floods in the Jingjiang-Dongting Lake areas under the regulation of the Three Gorges Dam.关键词
荆江/洞庭湖/河网/水动力学/嵌套模型/率定与验证/防洪Key words
Jingjiang River/Dongting Lake/river network/hydrodynamics/nested model/calibration and validation/flood control分类
建筑与水利引用本文复制引用
刘氚,张可能,戴明龙,冯罗杰,张俊宏,陈璐..荆江—洞庭湖河网一二维嵌套水动力学模型研究[J].沈阳农业大学学报,2017,48(5):576-583,8.基金项目
国家自然科学基金项目(51509273) （51509273）
水文水资源与水利工程科学国家重点实验室开放研究基金项目(2015491111) （2015491111）
中南民族大学中央高校基本科研业务专项资金资助项目(CZW15072,CZW15126) （CZW15072,CZW15126）
