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南汇东滩促淤工程设计波浪计算方案的确定由工程的设防标准和结构物堤线的走向决定,促淤工程为20年一遇设防标准,围堤工程为100年一遇设防,并且考虑促淤工程外侧护坡结构为围堤的一部分:主堤包括东侧顺堤和南侧堤,根据工程位置主要考虑波向分别为N向~E向和SE向~SW向。工程位于长江口杭州湾交汇处三角洲浅滩,波浪由深水传播至堤前的过程受河口地区复杂地势条件和局部风场的作用,采用能考虑上述动力因素的MIKE21 SW计算模块建立了不规则波风浪谱模型。针对促淤圈围工程对周边河势可能造成的影响,就工程区实测地形资料和工程后河势影响预测,通过数学模型计算分析了地形变化对波浪传播的影响。
Determine the wave calculation scheme for the project of promoting sedimentation in Nanhui Dongtan is determined by the fortification standard of the project and the trend of the embankment line of the structure. The silting up project is the fortification standard once in 20 years and the embankment project is fortified once in 100 years, The lateral slope protection structure is a part of the embankment: the main embankment includes the eastward embankment and the southward embankment. According to the project location, the main directions of the wave direction are N direction ~ E direction and SE direction ~ SW direction. The project is located at the delta shoal of the Hangzhou Bay Interchange in the Yangtze River estuary. The process of wave propagation from deepwater to the embankment is affected by the complicated topography and local wind field in the estuary area. The MIKE21 SW calculation module, which can consider the above dynamic factors, Spectral model. In view of the possible influence of silt enclosure engineering on the surrounding river regimes, the impact of the topographic changes on the wave propagation is analyzed and calculated based on the measured terrain data of the project area and the forecast of river impact after the project.