强潮河口桩式丁坝减冲促淤效果研究

Study of erosion-lessening and siltation-promotion effect for sheet-pile groins under strong tidal estuary

钱塘江涌潮气势雄伟,世界闻名,但对海塘具有很大的破坏力。该文提出了一种新颖的丁坝型式———桩式丁坝,从现场观测资料对比、实体模型试验和机理分析三个方面,分析桩式丁坝的减冲促淤效果,探究丁坝护滩保塘的机理。与堆石丁坝比较,桩式丁坝具有设计合理、施工简易、坝体内无内压力、有效地减轻了局部冲刷、便于维护检修等一系列优点。桩式丁坝可广泛应用于各类河道整治、海塘保护等工程中。

Strong tidal estuany of Qiantang estuary is well-known in the world, but it has great destroy power on sea dyke. In the paper a new type of groin is introduced. Based on the site observations, physical model experiment and mechanism analysis, the effect of eroslon-lessening and siltation-promoting of sheet-pile groins is analysed. From hydraulic characteristics of tidal flow over groins, the mechanism of flat-maintenance and dyke-protection of sheet-pile groins is discussed. Contrast to traditional riprap groins, sheet-pile groins is characterised by reasonable design, simple construction, convenient for maintenace and service, no inner pressure in the groin body and so on. Sheet-pile groins may be extensively applied to various river training and sea-dyke protection.