摘要
利用积分方法导得了漫滩河道全断面水流的积分方程组,应用四点加权隐格式离散方程,建立了漫滩河道洪水演算的一维水动力学模型.该模型考虑了各流道(如滩地、主河槽等)的不同阻力特征,反映了主槽和滩地水流流动路径的差异.用该模型计算了露滩、漫滩和露、漫滩交替的3种水流运动,并与二维RBFVM-2D模型的计算结果进行了比较.以长江宜昌～螺山江段1998年实际洪水过程为例,测试了模型的应用效果.计算结果均表明,本文的一维水动力学模型能较好地模拟漫滩河道的过流特征,并改善了漫滩河道洪水演进的模拟与预测能力.
The integrating equations for full cross-section water flows in a floodplain river are obtained by using the integrating method, and a one-dimensional hydrodynamic model for such rivers is developed by using the Preissmann implicit scheme. The different resistance characteristics of several “ channels” , such as main channel and floodplain channel, reflecting differences of water flow routing, are considered in the model. This model and RBFVM-2D model are both used to calculate the steady flow with and without overflowing, and the unsteady flow from low water level to high water level, and the calculation results are compared. The 1998＇s flood in the reach from Yichang to Luoshan in the Changjiang River is simulated. Calculation results show that this model can simulate the characteristics of water flow in a floodplain river and can improve the capacity of flood routing simulating and predicting.
出处
《水利水运工程学报》
CSCD
北大核心
2005年第4期29-35,共7页
Hydro-Science and Engineering
基金
中国科学院知识创新工程方向性项目(KXCX3-SW-331)
中国科学院南京地理与湖泊研究所所长专项基金(s250019)联合资助
关键词
漫滩
洪水演算
一维水动力学模型
floodplain
flood routing
one-dimensional hydrodynamic model
