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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
引用本文:陈可锋,陆培东,王乃瑞.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[J].水科学进展,2017,28(2):240-248.
作者姓名:陈可锋  陆培东  王乃瑞
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, 江苏 南京 210029
基金项目: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)
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。

关 键 词:拦门沙    航道淤积    整治工程    数学模型    射阳河口
收稿时间:2016-06-20

Study of back silting characteristics and mechanism of the channel-mouth bar under the influence of regulating project: a case study of the Sheyang Estuary
CHEN Kefeng,LU Peidong,WANG Nairui.Study of back silting characteristics and mechanism of the channel-mouth bar under the influence of regulating project: a case study of the Sheyang Estuary[J].Advances in Water Science,2017,28(2):240-248.
Authors:CHEN Kefeng  LU Peidong  WANG Nairui
Institution:State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing 210029, China
Abstract:Based on the measured terrain in different stages, the distribution characteristics of back silting in the Sheyang Port channel was analyzed. Velocity and sediment characteristics in Sheyang Port channel were calculated and analyzed by mathematical model. The reasons accounting for back silting in the waterway were discussed. The study showed that there is a widespread deposition in the channel after the channel engineering excavation, especially in the area near the mouth. The main reason of siltation in the channel is that the flood current speed is greater than that of ebb, so sediment is difficult to be taken out of the channel, which attributes to deposition of the channel. There are two reasons contributing to the back silting in estuary. Firstly, large amounts of sediment cross over the southern dike and go into the entrance of channel. In addition, there is an evident recirculation zone in the entrance channel during flood tide, which is easy to lead to gate sediment deposition. The reason for silting near the root of dike is the decrease of estuarine water carrying capacity during ebb tide, which is attributed to the river relaxation resulting from confluence of Sheyang River and Huangsha River.
Keywords:sand bar  back silting  regulating project  mathematical model  Sheyang River Estuary  
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