摘要
为探究黄河水库下游洪水演进水力要素规律,以水力学方法为基础,构建了一、二维耦合的水动力数值模型,对不同重现期设计洪水过程演进过程进行模拟,并提取关键断面水力要素值,分析其变化规律。结果显示,通过模型验证和模拟结果合理性分析发现,所用模型适用于黄河水库下游洪水演进过程;基于一、二维耦合水动力模型对不同洪水重现期条件下黄河水库下游洪水水力要素进行模拟,随着洪水重现期的增大,淹没水深及面积逐渐增加,沿程漫溢点增多。通过对不同重现期洪水条件下沿程关键断面水力要素的提取及模拟结果分析表明,在各重现期洪水条件下,最低及最高水位沿程呈现线性规律,且随着洪水重现期的增加,沿程最高及最低水位均呈现增加的趋势,如在10年一遇洪水重现期条件下,黄河水库下游4 km断面处最高、低水位分别为255.43、252.84 m;当洪水重现期增加至50年一遇时,该断面处最高、最低水位增至256.89、253.34 m。根据最大水深最短时间范围信息绘制危险区包络图,结合GIS空间分析技术,划定了避洪转移路线和安置区,可为研究水库下游洪水影响规律及洪水风险区的防洪避险决策方案提供支撑。
In order to investigate the laws of the hydraulic elements in the downstream flood evolution of the Yellow River reservoir,a 1D-2D coupled numerical hydrodynamic model is constructed based on the hydrodynamic method to simulate the evolution of the design flood process in different recurrence periods,extract the values of the hydraulic elements of key cross-sections and analyze their change laws.The results show that the model used in the paper is applicable to the downstream flood evolution process of the Yellow River reservoir through model validation and analysis of the reasonableness of the simulation results.Based on the 1D-2D coupled hydrodynamic model,the downstream flooding process of the Yellow River reservoir is simulated under different flood return periods.It is found that with the increase of the flood return period,the submerged water depth and area gradually increased,and the overflow points along the course increased.By extracting and analyzing the hydraulic elements of the key cross-sections along the course of the simulation results under different return periods of flooding,it is shown that the minimum and maximum water levels present a linear pattern along the course of the simulation under different return periods of flooding,and with the increase of the return period of flooding,the maximum and minimum water levels along the course of the simulation show an increasing trend,for example,under the condition of the 10-year return period of flooding,the maximum and minimum water levels at the 4km cross-section downstream of the Yellow River reservoir are 255.43 m and 252.84 m respectively;when the flood return period is increased to once in 50 years,the maximum and minimum water levels at this section increased to 256.89 and 253.34 m.According to the information of the maximum water depth and the shortest time range,the hazard zone envelope is mapped,and combined with the GIS spatial analysis technology,the flood avoidance transfer route and resettlement area are formulated,which can be used for
作者
孙继鑫
王剑
杨少雄
杨波
陈光照
侯精明
SUN Jixin;WANG Jian;YANG Shaoxiong;YANG Bo;CHEN Guangzhao;HOU Jingming(Xi'an Aerospace Remote Sensing Data Technology Co.,Ltd.,Xi'an 710100, China;Space Star Technology Co., Ltd,Beijing 100094,China;State Key Laboratory Base of Eco-Hydraulic Engineering in Arid Area,Xi'an University of Technology,Xi' an 710048, China)
出处
《西北水电》
2022年第2期18-26,共9页
Northwest Hydropower
基金
吉林市水库洪水风险图智能决策系统建设项目(20190917Z1041-1).
关键词
一、二维耦合
水动力模型
洪水影响规律
避洪决策
1D-2D coupling
hydrodynamic model
flood impact law
flood avoidance decision-making
