Email Alerts
RSS
Flood risk analysis for Yaohu Lake dyke based on coupled hydrodynamic model
-
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。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
-
表 1 网格糙率取值
Table 1. Grid roughness values
土地类型 糙率 备注 村庄 0.070 居民地 树丛 0.065 幼林、竹林、疏林、成林、灌木林 旱田 0.060 旱地、城市绿地、园地、草地、苗圃、
荒草地、高草地、半荒草地、迹地水田 0.050 
下载: 导出CSV
表 2 溃口水量平衡验证
Table 2. Water balance verification of breaches
溃口编号 溃口名称 进洪量/m3 保护区内水量/m3 相对误差/% 1 鸡鸣洲 4.028×107 4.025×107 0.07 2 大王庙 1.058×108 1.058×108 0 3 司家闸 3.384×107 3.382×107 0.06
下载: 导出CSV
表 3 洪水风险数据统计
Table 3. Statistics of flood risk data
溃口编号 淹没面积/km2 淹没耕地面积/hm2 受影响人口总数/(万人) 最大淹没水位/m 最大淹没水深/m 1 10.62 681.55 0.45 27.01 >3 2 56.67 3 953.21 2.45 22.67 >3 3 18.36 775.87 0.74 22.13 >3
下载: 导出CSV
-
[1] 苑希民, 田福昌, 王丽娜.漫溃堤洪水联算全二维水动力模型及应用[J].水科学进展, 2015, 26(1): 83-90. http://d.wanfangdata.com.cn/Periodical/skxjz201501011 YUAN Ximin, TIAN Fuchang, WANG Lina. Comprehensive two-dimensional associate hydrodynamic models for overflow and levee-breach flood and its application[J]. Advances in Water Science, 2015, 26(1): 83-90. (in Chinese) http://d.wanfangdata.com.cn/Periodical/skxjz201501011 [2] DUSHMANTA D, JAHANGIR A, KAZUO U, et al. A two-dimensional hydrodynamic model for flood inundation simulation: a case study in the lower Mekong river basin[J]. Hydrological Progresses, 2007, 21: 1223-1237. doi: 10.1002/(ISSN)1099-1085 [3] 宋利祥. 溃坝洪水数学模型及水动力学特性研究[D]. 武汉: 华中科技大学, 2012. http://cdmd.cnki.com.cn/article/cdmd-10487-1012361474.htm SONG Lixiang. Research on mathematical model and hydrodynamic characteristics of dam-break floods[D]. Wuhan: Huazhong University of Science and Technology, 2012. (in Chinese) http://cdmd.cnki.com.cn/article/cdmd-10487-1012361474.htm [4] 李云, 范子武, 吴时强, 等.大型行蓄洪区洪水演进数值模拟与三维可视化技术[J].水利学报, 2005, 36(10): 1158-1164. doi: 10.3321/j.issn:0559-9350.2005.10.003 LI Yun, FAN Ziwu, WU Shiqiang, et al. Numerical simulation and 3-D visualization of flood propagation in large-scale detention basins[J]. Journal of Hydraulic Engineering, 2005, 36(10): 1158-1164. (in Chinese) doi: 10.3321/j.issn:0559-9350.2005.10.003 [5] 姜晓明, 李丹勋, 王兴奎.基于黎曼近似解的溃堤洪水一维-二维耦合数学模型[J].水科学进展, 2012, 23(2) : 214-221. http://d.wanfangdata.com.cn/Periodical/skxjz201202010 JIANG Xiaoming, LI Danxun, WANG Xingkui. Coupled one and two-dimensional numerical modeling of levee-breach flows using the Godunov method[J]. Advances in Water Science, 2012, 23(2): 214-221. (in Chinese) http://d.wanfangdata.com.cn/Periodical/skxjz201202010 [6] 张大伟, 李丹勋, 陈稚聪, 等.溃堤洪水的一维、二维耦合水动力模型及应用[J].水力发电学报, 2010, 29(2) : 149-154. http://d.wanfangdata.com.cn/Periodical/slfdxb201002027 ZHANG Dawei, LI Danxun, CHEN Zhicong, et al. Coupled one-and two-dimensional hydrodynamic models for levee-breach flood and its application[J]. Journal of Hydroelectric Engineering, 2010, 29(2) : 149-154. (in Chinese) http://d.wanfangdata.com.cn/Periodical/slfdxb201002027 [7] 李大鸣, 林毅, 周志华.蓄滞洪区洪水演进一、二维数值仿真及其在洼淀联合调度中的应用[J].中国工程科学, 2010, 12(3): 82-88. http://d.wanfangdata.com.cn/Periodical/zggckx201003014 LI Daming, LIN Yi, ZHOU Zhihua. Research on 1D and 2D numerical simulation of flood routing and its application of combined-regulation in detention basin[J]. Chinese Engineering Science, 2010, 12(3): 82-88. (in Chinese) http://d.wanfangdata.com.cn/Periodical/zggckx201003014 [8] 王炜. 二维洪水数值模拟在太浦河洪水风险图编制中的应用[D]. 上海: 同济大学, 2008. http://cdmd.cnki.com.cn/Article/CDMD-10247-2008066882.htm WANG Wei. Application of 2D numerical simulation to flood hazard mapping of Taipu river[D]. Shanghai: Tongji University, 2008. (in Chinese) http://cdmd.cnki.com.cn/Article/CDMD-10247-2008066882.htm [9] 付成威, 苑希民, 杨敏.实时动态耦合模型及其在洪水风险图中的应用[J].水利水运工程学报, 2013(5): 32-38. http://slsygcxb.cnjournals.org/ch/reader/view_abstract.aspx?file_no=201305005&flag=1 FU Chengwei, YUAN Ximin, YANG Min. A real-time dynamic coupling model for flood routing and its application to flood risk charting[J]. Hydro-Science and Engineering, 2013(5): 32-38. (in Chinese) http://slsygcxb.cnjournals.org/ch/reader/view_abstract.aspx?file_no=201305005&flag=1 [10] 刘刚, 金生.基于修正Roe格式的有限体积法求解二维浅水方程[J].水利水运工程学报, 2009(3): 29-33. http://slsygcxb.cnjournals.org/ch/reader/view_abstract.aspx?file_no=20090345&flag=1 LIU Gang, JIN Sheng. Finite volume model for the 2D shallow water equations using modified Roe scheme[J]. Hydro-Science and Engineering, 2009(3): 29-33. (in Chinese) http://slsygcxb.cnjournals.org/ch/reader/view_abstract.aspx?file_no=20090345&flag=1 [11] 王艳艳, 韩松, 喻朝庆, 等.太湖流域未来洪水风险及土地风险管理减灾效益评估[J].水利学报, 2013, 44(3): 327-335. http://d.wanfangdata.com.cn/Periodical/slxb201303012 WANG Yanyan, HAN Song, YU Chaoqing, et al. The flood risk and flood alleviation benefit of land use management in Taihu basin[J]. Journal of Hydraulic Engineering, 2013, 44(3): 327-335. (in Chinese) http://d.wanfangdata.com.cn/Periodical/slxb201303012 [12] 李琼. 洪水灾害风险分析与评价方法的研究及改进[D]. 武汉: 华中科技大学, 2012. http://cdmd.cnki.com.cn/article/cdmd-10487-1012361172.htm LI Qiong. The research and improvement of risk analysis and evaluation method on flood disaster[D]. Wuhan: Huazhong University of Science and Technology, 2012. (in Chinese) http://cdmd.cnki.com.cn/article/cdmd-10487-1012361172.htm -
点击查看大图
图(5) / 表 (3)
计量
- 文章访问数: 1064
- HTML全文浏览量: 67
- PDF下载量: 363
- 被引次数: 0
