Abstract
In a situation where water overflow occurs on the seawalls due to a storm surge, generally it is high waves that cause wave overtopping. However, it is common that overflow and overtopping are modeled as separate phenomena, in a situation where both phenomena occur at the same time, the amount of water exceeding the seawalls may not be evaluated correctly. The purpose of this research is to develop a new wave overtopping model including the water overflow for vertical seawalls. The new overtopping model improved the overtopping model of Goda (Goda, 2008: Goda08 model). Goda08 model was developed to adapt for various seawall forms. Goda (2008) insisted it was more accurate than EurOtop model. Nonetheless, Goda08 model has a problem of overestimation in shallow area. Therefore, we tuned the parameters again. It is difficult to reproduce the situation where the overtopping and overflow occur at the same time in a hydraulic experiment. Consequently, CADMAS-SURF which is based on the 2-dimensional non-compressive fluid using the VOF method was used as an experimental data provider for comparative verification of the model.
Highlights
In a situation where water overflow occurs on the seawalls due to a storm surge, generally it is high waves that cause wave overtopping
We carried out numerical experiments which occurred overflow and overtopping using CADMAS-SURF
The new overtopping and overflow model was developed with these experiments
Summary
In a situation where water overflow occurs on the seawalls due to a storm surge, generally it is high waves that cause wave overtopping. The purpose of this research is to develop a new wave overtopping model including the water overflow for vertical seawalls. Goda model solved the problem of being underestimated at a large relative depth. The behavior of Goda model was unstable in small relative depths (h/H0′ < 0.2) To solve these problems, we improved Goda model (Equations (1) – (11)). The proposed model is consistent with the Goda model in large relative depths, and close the experimental results in small relative depth (Figure 1).
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