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长江中游是由水库、湖泊、蓄滞洪区组成的复杂防洪工程体系,针对荆江-洞庭湖复杂河网系统规模庞大、水流复杂的特点,建立了一、二维联算洪水演进模型,其中河道与湖区采用一维河网模型,分蓄洪区水流采用二维模型模拟.模型提出了实时预报模式、河网断流计算模式、河道与分蓄洪区水量交换模式.将模型用于荆江特大洪水调度,较好地反映了洪水在荆江-洞庭湖河网区的演进过程,模型可用于实际防洪调度方案评估.
The middle reaches of the Yangtze River is a complex flood control engineering system composed of reservoirs, lakes and flood storage and detention areas. According to the large scale and complicated water flow of the Jingjiang-Dongting Lake complex river network system, a one-dimensional and two-dimensional simultaneous flood model is established. Among them, One-dimensional river network model was adopted in the lake area and two-dimensional model was used to simulate the water flow in the flood diversion area.The models proposed real-time prediction model, river network discontinuous flow calculation model and water exchange model between floodplain and flood diversion area.The model was used for Jingjiang extra-large flood regulation, Which better reflects the evolution of flood in the Jingjiang-Dongting Lake river network area. The model can be used to evaluate the actual flood control schedule.