海平面上升对广东沿海工程设计参数的影响

参照广东沿海6个岸段2030年相对海平面上升的预测值,建议提高沿海工程的设计基准面。根据高潮位升幅的数值模拟,建议提高工程的设计高潮位。在计算不同频率风暴潮潮位重现期变化的基础上,提出各岸段重现期的设防标准。在计算波高增幅的基础上,提出各岸段设计波高的增大值。

Impacts of Sea Level Rise on Design Parameters of Coastal Engineering in Guangdong Province

It is forecasted that the relative sea level may rise by an amplitude of 10-30 cm during 1990-2030 in the six coastal regions of Guangdong Provice.This amplitude can be regarded as a parameter to raise the design base level of coastal engineering. From the forecasted amplitude of sea level rise,using by hydraulic model the rising amplitude of floodtide water level can be calculated.Based on the calculated result, the highest design tide level should be raised correspondingly. If the sea level rises 10-30 cm,the increase amplitude of the highest floodtide water level is calculated for 20 stations.Comparing the calculated result with the highest floodtide water level at present,the change of reappearing period can be forecasted. Rising of sea level leads to heighten the wave.At present the design wave height is on the low side.According to the calculation for 20 stations, the design wave height should be raised by 15-19cm and 23-27cm when the sea level rises 20cm and 30cm respectively.