引用本文:陈俊鸿,陈炼钢,王岗,施勇,刘小龙.基于耦合水动力模型的药湖联圩区洪水风险分析[J].水利水运工程学报,2017,(5):30-36
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基于耦合水动力模型的药湖联圩区洪水风险分析
陈俊鸿1,2, 陈炼钢1, 王岗2, 施勇1, 刘小龙1
1.南京水利科学研究院水文水资源与水利工程科学国家重点实验室，江苏南京;2.河海大学港口海岸与近海工程学院，江苏南京
摘要:
鄱阳湖赣江尾闾药湖联圩防洪保护区水系繁多，频繁受到洪水侵袭，因此极有必要对该地区开展洪水风险分析。建立了能够模拟溃堤洪水水流演进的一、二维耦合水动力模型，并利用糙率分区、河道地形还原等技术进行优化，提高了模型精度。将该模型应用于药湖联圩防洪保护区，计算区域采用非结构化三角形网格进行剖分，设定溃口发生瞬时溃堤，溃口流量满足水量平衡原理，演进结果合理可靠。对演进计算结果进行洪水风险分析，结果表明：鸡鸣洲、大王庙、司家闸溃口洪水淹没面积分别为10.62，56.67，18.36 km2，淹没分布基本遵从地形高低原则，保护区内的淹没水深基本都大于3 m，区内洪水淹没范围大小和影响人口数量与溃口位置有关。
关键词:  水动力模型  一、二维耦合  药湖联圩  风险分析  溃堤洪水
DOI：
分类号:TV122
基金项目:国家重点研发计划（2016YFC0402207， 2016YFC0402201）； 国家自然科学基金资助项目（51579090， 51679143）
Flood risk analysis for Yaohu Lake dyke based on coupled hydrodynamic model
CHEN Junhong1,2, CHEN Liangang1, WANG Gang2, SHI Yong1, LIU Xiaolong1
1.State Key Laboratory of HydrologyWater Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing;2.College of Harbour, Coastal and Offshore Engineering, Hohai University, Nanjing
Abstract:
The Yaohu Lake dyke flood protection area in Poyang Lake region has various water systems and complicated hydrological condition. The inundant flood hits the entire region during the flood period, so the corresponding flood risk analysis in this region has a great significance. A 1D and 2D coupled hydrodynamic model to simulate the evolution of levee-breach flood is developed in this study, and the model is optimized by roughness partitioning and river topography reduction, which improves the model’s precision. The system is applied to Yaohu Lake dyke flood protection area, and the calculation area is divided into unstructured triangular grids. The instantaneous dike break is set up, and the breach flux meets the principle of water balance. The evolution result is reasonable and reliable, based on which the flood risk analysis is carried out. The analysis results show that the areas flooded due to the breaches of Jimingzhou, Dawangmiao and Sijiazha are 10.62, 56.67 and 18.36 km2 respectively. The submerged distribution basically follows the principle of topography, and the submerged water depth in the protected area is basically deeper than 3 m. And the inundated area size and the impacted population are related to the breach’s position.
Key words:  hydrodynamics  1D and 2D coupled model  Yaohu Lake dyke  flood risk analysis  levee breach flood
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