一、二维耦合数学模型在感潮河网洪水风险图编制中的应用

发布时间：2019-03-22 19:23

【摘要】：为了解决感潮河网径流、潮汐交汇,动力复杂,溃决洪水难以用经验公式准确概化的问题,建立直接以溃口为耦合断面的河网一维、保护区二维侧向耦合模型,将感潮河网与保护区一体化,避免环境因素及经验参数的不确定性带来的溃口流量估算误差。典型算例和中顺大围溃决洪水情景模拟表明:洪水自溃口集中喷射出后分散流向围内,流态受围内下垫面影响显著,溃口水位、流量随外江潮位涨落而起伏变化,由溃口流量过程线计算所得溃口水量与根据淹没区各单元的面积和水深计算的围内总水量一致。模拟成果直接反映下垫面、水头差、潮位涨落,及溃口流态对溃决洪水的综合影响,反映出本耦合模型计算溃口流量及对溃决洪水模拟的合理性、可信性,具有较好的应用前景。
[Abstract]:In order to solve the problems of tidal network runoff, tidal intersection, complex dynamics and difficult to accurately generalize burst flood by empirical formula, a one-dimensional and two-dimensional lateral coupling model of river network with break mouth as coupling cross-section is established. The tidal-sensitive river network is integrated with the protected area to avoid the estimation error of gully discharge caused by the uncertainty of environmental factors and empirical parameters. The typical example and simulation of the burst flood scenario of Zhongshun Dawei show that the flow pattern is significantly affected by the underlying surface in the surrounding area, and the water level and the discharge fluctuate with the fluctuation of the tide level of the outer river, after the flood has been ejected centrally from the collapse mouth and then dispersed into the enclosure. The water volume calculated from the process line of the collapse flow is consistent with the total water quantity in the enclosure calculated according to the area and depth of each unit in the submerged area. The simulation results directly reflect the comprehensive effects of the underlying surface, head difference, tidal level fluctuation, and flow pattern of the collapse on the burst flood, and reflect the rationality and credibility of the coupling model for calculating the discharge of the collapse and the simulation of the burst flood, and the feasibility and reliability of the coupling model for the calculation of the burst discharge and the simulation of the burst flood. It has a good application prospect.
【作者单位】：珠江水利委员会珠江水利科学研究院;珠江水利委员会水利部珠江河口动力学及伴生过程调控重点实验室;珠江水利委员会防汛抗旱办公室;
【基金】：国家自然科学基金青年基金项目(51409286)
【分类号】：TV122.4

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