| 摘要: |
| 以大量工程现场资料为基础，初步分析2015年长江口航道运行维护特征，以及今后一段时期深水航道维护形势。分析表明，通过维护性疏浚，2015年长江口航道运行状况良好，12.5 m深水航道已进入全面发挥效益的稳定运行阶段。2015年南港北槽12.5 m航道维护疏浚强度总体仍保持时空相对集中的分布特征。与2011—2014年相比，2015年南港及圆圆沙段疏浚强度下降近15%，全年1—12月疏浚强度也普遍有所降低，这主要与南港河床地形条件和周边河势的改善，以及疏浚工艺与管理的优化有关。今后一段时期，在长江口河势格局及水沙动力环境整体稳定的前提下，12.5 m深水航道维护态势总体可控，且趋于向好。由于航道回淤时空分布特征未发生根本改变，后续长江口深水航道的重点维护时段和区段依然是夏秋季（6—11月）和北槽中段。 |
| 关键词: 长江口 疏浚维护 航道淤积 125 m深水航道 南槽 |
| DOI： |
| 分类号:U617.5 |
| 基金项目:国家自然科学青年基金资助项目（41506108）；国家科技支撑计划项目（2013BAB12B04，2013BAB12B05） |
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| Characteristic analysis of dredging maintenance for Yangtze River estuary deepwater navigation channel in 2015 |
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ZHAO Dezhao, WAN Yuanyang
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Key Laboratory of Estuarine and Coastal Engineering, Ministry of Transport, Shanghai Estuarine and Coastal Science Research Center, Shanghai
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| Abstract: |
| Based on a series of engineering field data, the characteristics of dredging maintenance and sedimentation of the Yangtze River estuary 12.5 m deepwater navigation channel (DNC) in 2015 are primarily analyzed, meanwhile the sedimentation trend of the DNC in the future is also discussed. The analysis results show that the DNC operation was under a good condition in 2015 and the total dredging volume was in a controllable and reasonable range. Thus, the DNC has stepped into a steady operation stage, which has achieved a desired social and economic effect. The temporal and spatial distribution of the dredging intensity in the south waterway’s north passage of the DNC was still relatively concentrated in 2015. Comparing with 2011-2014, the dredging intensity of the south waterway and Yuanyuansha channel was reduced by 15% in 2015, and the dredging intensity in all the months during the year was also generally decreased, which is mainly related to the improvement of the bed bathymetry condition of the south waterway and the surrounding river regime as well as optimization the dredging management. In the future, under the stable conditions of the river regime and water-sediment dynamic environment in the Yangtze River estuary, the maintenance situation of the DNC will be overall controllable and positive. Because the space-time characteristics of the sedimentation are not variable substantially, the maintenance highlight of the DNC is still in the summer and autumn (June to November) and the location is in the middle-stream of the north passage. |
| Key words: Yangtze River estuary maintenance by dredging navigation channel siltation 12.5 m-deep navigation channel (DNC) south passage |
