A COUPLING HYDRODYNAMIC MODEL ON WATER SYSTEM OF THE DONGTING LAKE AREA
A COUPLING HYDRODYNAMIC MODEL ON WATER SYSTEM OF THE DONGTING LAKE AREA
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发表时间：
2008
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通讯作者：
Lai Xi;C. Nanjing
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作者：
Lai Xi;C. Nanjing
针对洞庭湖区水动力复杂、河湖交错的特点，建立了一个一、二维耦合的非恒定流模型，对洞庭湖区洪水演进进行了数值模拟。湖泊及周边河流，采用二维非结构有限体积法计算湖泊水流，该方法可以拟合复杂的几何边界，处理干湿变化过程圣该方法采用Venant方程计算河漫滩和主槽汇流，特别适用于天然复式河流的汇流计算，并采用重叠投影法进行耦合，为验证该模型的有效性，对1996年7月的洪水进行了模拟，结果表明，该模型较好地模拟了湖泊水流特性和洪水演进。
Hydrodynamics in the Dongting Lake area is very complicated with rivers/lakes interlacement.A coupling 1-D and 2-D unsteady flow model was developed to simulate the flood routing in this area.The model includes two parts: lakes and surrounding rivers.Lake flows were calculated with 2-D unstructured finite volume method,which can fit com- plex geometry boundary and treat wetting/drying process.1-D approach was applied in the network with surrounding rivers The Saint-Venant equations used in the approach can calculate floodplain and main channel convergence,which works fine especially in the calculation of natural compound rivers.The model was coupled using overlapping projecting method.To validate the present model,it ran for the flood in July 1996 in the study area.Shown by the results,this model has simu- lated successfully the characteristics of flows in the lakes and the flood routing in this system.