燕子河流域洪水演进数值模拟

Numerical Simulation of Flood Evolution in the Yanzi River Basin

为了对中小河流流域洪水风险进行预测分析,以山东省临沂市燕子河流域为研究对象,利用水动力学模型对洪水演进进行数值模拟;采用MIKE 11软件建立一维水动力学模型,分别模拟洪水重现期为5、10、20、50、100 a的河道洪水演进过程;利用MIKE 21软件对燕子河防洪保护范围构建二维模型;利用MIKE FLOOD软件侧向耦合一、二维模型,模拟不同洪水重现期洪水从河道漫溢至岸边的演进过程,对模拟结果进行分析,得到洪水的淹没范围、水深、流速等信息。结果表明:洪水重现期为5、10、20、50、100 a时洪水淹没范围分别为0、4.09、7.59、13.87、18.44 km^(2),最大淹没深度分别为0、4.56、5.46、6.20、6.49 m,洪水最大流速分别为0、3.04、3.58、3.98、4.70 m/s;罗庄区西陆庄村、为儿桥村以及兰陵县西庄村、松山东村等村落为淹没风险较大区域。

To predict and analyze the flood risk of medium or small river basins,the Yanzi River Basin in Linyi city,Shandong province was taken as the research object,and the hydrodynamic model was used to simulate the flood evolution.An one-dimensional hydrodynamic model was established by using MIKE 11 software to simulate the flood evolution of river channels with flood recurrence periods of 5,10,20,50,100 a,respectively.A two-dimensional model of the flood protection area of the Yanzi River was constructed by using MIKE 21 software.By using MIKE FLOOD software,the one-and two-dimensional models were laterally coupled to simulate the evolution process of flood from the river to the bank in different flood recurrence periods,and the simulation results were analyzed to obtain flood inundation range,water depth,velocity and other information.The results show that when the flood recurrence period is 5,10,20,50,100 a,the flood inundation range is 0,4.09,7.59,13.87,18.44 km^(2),the maximum inundation depth is 0,4.56,5.46,6.20,6.49 m,and the maximum flood velocity is 0,3.04,3.58,3.98,4.70 m/s,respectively.There is a significant risk of inundation in Xiluzhuang village and Weierqiao village in Luozhuang district,as well as Xizhuang village and Songshandong village in Lanling county.