苏州河清淤对河槽动库容利用效率影响研究

Research on Impact of Suzhou Creek Dredging on Utilization Efficiency of River Channel Dynamic Storage Volume

摘要:

针对平原感潮河网“外潮、内涝、上洪”的复杂特征，探究苏州河清淤对河槽调蓄效率的影响，解决传统静库容计算忽略动库容占用的问题。通过一维非恒定流模型，以“竹节草”台风为工况，模拟不同清淤方案，量化分析不同清淤深度与有效库容、水位降幅的关系。结果表明，清淤通过降低水面比降显著提升有效库容，其与清淤深度呈非线性边际效益关系，据此推荐了兼顾除涝效益与工程经济性的最优方案。基于动库容理论的清淤优化策略，可为苏州河及类似河网的除涝能力提升提供理论依据。

Abstract:

In view of the complex characteristics of the plain tidal river network, such as “external tides, internal waterlogging and upstream flooding”, the impact of dredging on the storage efficiency of the Suzhou Creek is explored in order to resolve the issue where traditional static storage calculations neglect the occupation by dynamic reservoir capacity. Utilizing a one-dimensional unsteady flow model under the “Zhujiecao” typhoon scenario, various dredging schemes are simulated to quantitatively analyze the relationship between different dredging depths and the effective reservoir capacity as well as the decrease in water level. The results indicate that the dredging significantly increases the effective reservoir capacity by reducing the specific drop of the water surface, which has a nonlinear marginal benefit relationship with the depth of dredging. Based on this, the optimal scheme that takes into account both the flooding control benefits and the economic feasibility of the project is recommended. The dredging optimization strategy based on the dynamic reservoir capacity theory can provide a theoretical basis for improving the flooding control capacity of the Suzhou Creek and similar river networks.