Review and optimization of revetment design at Pasay Harbor

The Challenge

Pasay Harbor City reclamation Phase 1 is a two-islands configuration with a total land surface of 265 hectares. As part of the land reclamation a revetment is designed. On top of the revetment two wave walls are being placed. The combination of the two walls gave rise to a luxury promenade on which temporally markets, and shops are placed. The combination of two wave walls is rarely used and consequently limited engineering guidelines exist for these types of structures. To determine the effectiveness of the design, various design parameters are required such as wave overtopping over the first and second wave wall and the forces on both walls. Royal HaskoningDHV was contracted to review the design of the revetment and to give suggestions for the optimization of the design. These optimizations could later be applied in the physical model tests.

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The Solution

As traditional hydrodynamic models are extremely limited in modelling a double wave wall on top of a revetment, the Computational Fluid Dynamics (CFD) software package CoastalFOAM was used. In this model a real scale digital wave flume is simulated, calculating the water velocity, hydrostatic pressure, and non-hydrostatic pressure over the entire model domain, including the inside of the rock berm of the breakwater.

First, the final design of the revetment was placed in the flume and the revetment was tested for several storm conditions. The wave overtopping was measured over each wave wall and based on the time series of the wave overtopping the design was changed to reduce the wave overtopping. The new structure was also tested in the digital flume. After several iteration steps the design was sufficiently optimized.

The Result

The digital wave flume provided time series of the wave overtopping and timeseries of the forces on the wave walls. Based on these timeseries several optimizations were suggested which could later be applied in physical model tests. The digital wave flume demonstrated the possibilities to optimize the structure. This project has demonstrated the benefits of CFD modelling in the design process.