【摘要】 极端降水引起的城市内涝问题日益严峻，大量地表积水甚至衍生出部分地下空间的淹没受灾。针对目前水文水动力模型地下空间研究应用不足的现状，以郑州市某片区2021年“7·20”特大暴雨下的内涝过程为例，构建基于InfoWorks ICM的区域地表-地下空间联合模拟模型，对地下空间采用概化蓄水池法和水力连通法2种方式建模，分析局地内涝的成因、发展和影响。结果表明：地下空间内涝对地表积水的削减作用有限；概化蓄水池法简洁易行，水力连通法详细还原地下淹没过程；累积雨量和强降水时段对地下空间洪涝均有重要影响。地表-地下空间洪涝模拟丰富了城市暴雨洪水预警预报的内容，为防灾减灾提供支撑依据和参考。更多还原

【Abstract】 Urban waterlogging due to extreme precipitation presents an increasingly serious challenge.Pooling of large volumes of surface water can result in flooding of underground spaces.However, there remains limited studies on flooding of underground spaces through the application of hydrological and hydrodynamic models.This study examined flooding in an urban district of Zhengzhou City, China during an extreme rainstorm event on 20th July, 2021.An integrated simulation model of regional surface and underground spaces was established based on InfoWorks Integrated Catchment Model(ICM) software.The generalized reservoir and hydraulic connectivity methods were used to simulate underground spaces.Factors contributing to the initiation and development of flooding of underground spaces were analyzed.The results showed that underground waterlogging was less conducive to alleviation of surface water ponding.The advantages of the generalized reservoir method were shown to be its relative simplicity and feasibility, whereas that of the hydraulic connection method was its detailed representation of underground flooding.Both the cumulative quantity of rainfall and rainfall intensity were shown to have important effects on underground inundation.The results of this study can help to improve urban stormwater forecasting and warning systems, and provide a theoretical basis for regional disaster prevention and reduction.更多还原