整治工程影响下的河口拦门沙航道回淤特征及成因——以射阳港航道为例

发布时间：2018-01-23 06:26

本文关键词： 拦门沙航道淤积整治工程数学模型射阳河口　出处：《水科学进展》2017年02期 　论文类型：期刊论文

【摘要】：通过不同时期实测地形资料,对比分析射阳港拦门沙航道一期整治工程建设后航道的回淤分布特征;利用实测水文泥沙资料和潮流数学模型计算分析射阳河口拦门沙航道开挖后的水流、含沙量特征;探讨了射阳港拦门沙航道淤积的泥沙来源和淤积成因。研究表明:航道开挖后沿程普遍淤积,尤其是口门及堤根区段航道淤积严重。导致航道淤积的主要原因为:有掩护航道内涨潮流速大、落潮流速小,口门外高含沙量水体进入航道后泥沙很难被带出航道,导致航道内普遍淤积;口门内2 km范围内回淤较大是由于越堤流输沙和口门内侧涨潮期间存在明显回流;导堤根部航道段回淤较大是由于射阳河与黄沙港河汇流后河道放宽,落潮期间出河口的水体挟沙力突然降低。
[Abstract]:Based on the topographic data measured in different periods, the characteristics of siltation distribution in the channel after the construction of the first stage regulation project of Sheyang port are compared and analyzed. Based on the measured hydrological and sediment data and tidal current mathematical model, the characteristics of flow and sediment content in Sheyang Estuary after excavation are analyzed. In this paper, the source and cause of siltation in Sheyang Harbor Channel are discussed. The results show that the siltation is common along the channel after excavation. Especially, the channel siltation in the entrance and dike root section is serious. The main reasons of the channel siltation are: the high tide velocity is large and the falling tide velocity is small in the sheltered channel. It is difficult to take sediment out of the channel after the high sediment content water enters the channel, which leads to the accumulation of sediment in the channel. The siltation within 2 km of the entrance gate is larger because of the obvious reflux during the period of sediment transport through the embankment and the high tide in the inside of the entrance. The siltation in the channel section at the root of the guide dike is larger because of the relaxation of the channel after the confluence of Sheyang River and Huangsha Port River and the sudden decrease of sediment carrying capacity of the estuary during the period of falling tide.
【作者单位】：南京水利科学研究院水文水资源及水利工程科学国家重点实验室;
【基金】：国家自然科学基金资助项目(40706034) 南京水利科学研究院院基金资助项目(Y213004)~~
【分类号】：U617
【正文快照】： 拦门沙因水浅给河流水运和海运事业的发展以及通海航槽的建设带来了极大的影响,拦门沙航道的整治研究一直是河流、海岸动力学及港口航道开发与治理的重要及前沿课题之一[1-4]。拦门沙航道清挖后容易发生淤积,如美国密西西比河口早期曾用疏浚开辟拦门沙航道,但一遇风暴挖槽即被

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