基于数字高程模型定量分析长江口深水航道工程治理效果

长江口深水航道工程于1998年开工建设,2002年和2005年一期和二期工程先后竣工,分别达到8.5和10.0 m通航水深。自2006年三期工程实施以来,北槽航道中段连续4a发生严重淤积,年疏浚维护量平均达6×107m3,影响三期工程目标的如期实现。通过自主开发的数字高程模型定量分析平台,建立时间序列的空间分布属性数据库,对长江口深水航道工程治理过程前后的河床冲淤变化规律和工程效果进行量化分析,分析结果揭示了长江口南港北槽深水航道近期淤积的泥沙来源、淤积过程、主要淤积原因和淤积部位,从而为工程治理对策提供科学依据。

The quantitative analysis for Changjiang Estuary deepwater channel regulation project effects based on digital elevation model

The Changjiang Estuary deep-waterway project was started in 1998, and in 2002 and 2005, the first and second phase projects have been completed one after another, the water depth of navigation reached 8.5 and 10.0 m respectively. Since the third phase project in 2006, the middle segments of the North Passage have been silted for successive four years and the average annual dredging maintenance volume has reached 60×10⁶ m³, which has affected the target of the third phase project. Using a special self-developed digital elevation model platform for quantitative analysis and establishing a time series and spatial attribute database, the rule of riverbed erosion and deposition variation and project results were analyzed quantitatively. The analysis results reveal silted sediment sources, silted process, key siltation causes and silted positions for the North Passage deep waterway of Changjiang Estuary South Channel, which provide the scientific basis for the engineering decision-making.