## 3 Results and Discussions
### Effects of T/T\({}_{f}\) and \(h\)/\(h_{\text{f}}\) on \(P_{wec}\)  
The proposed WEC system can generate power in the range \(k_{e}\) = 0.2-0.4, regardless of \(H_{\text{i}}\)/\(L\), excluding the case of \(k_{e}>0.5\) (surrounded by a red circle in Figure 14) and the case of \(D\)/\(L\approx 0.43\) (surrounded by a blue circle in Figure 14) near the positions of the anti-node of the standing waves. This relationship can be clearly observed in Figure 18, which depicts the relationship between \(P_{nure}\) and \(P_{WEC}\). Figure 18 indicates that the larger the value of \(P_{nure}\), the greater the value of \(P_{WEC}\) produced. Figure 16: Relationship between \(H_{\text{j}}\)/\(L\) and \(k_{r}\) for (**a**) pattern E and (**b**) pattern A.  
Figure 17: Relationship between \(k_{e}\) and \(k_{r}\) for pattern A. The linear approximation line (black dotted line in Figure 18), excluding the data surrounded by the red and blue circles, denotes a relationship of \(y=0.2935x\), which indicates that power can be produced at a ratio of approximately 0.3 to wave power in this system. Focusing on \(T/T_{f}\) in Figure 18a, no particular relationship is observed between \(T/T_{f}\) and \(P_{WEC}\), which is analogous to the results in Section 3.3, whereas the case for \(T/T_{f}=0.9\) except for the results surrounded by blue circles tending to exceed the approximation line. As illustrated in Figure 14a, the results are attributed to the location of the flap, for which \(T/T_{f}=0.9\) is mainly in the range of \(0.31<D/L<0.43\), where the maximum \(k_{e}\) appears (\(D/L\approx 0.32\)). On the other hand, focusing on the other cases positioned above the approximation line for \(T/T_{f}=1.1\), 1.3, and 1.5, most cases correspond to the cases at \(h/h_{f}\leq 1.0\) in Figure 18b. The influence of \(h/h_{f}\) on \(P_{WEC}\), as depicted in Figure 18b, is largely classified by whether the water depth is larger than the flap height (\(h/h_{f}>1.0\)) or not (\(h/h_{f}\leq 1.0\)). The correlation of \(P_{WEC}\) according to \(h/h_{f}\) increasing or decreasing was not observed, distinctly. Most cases larger than the approximation line in Figure 18b are observed at \(h/h_{f}\leq 1.0\) in the whole range of \(P_{wave}\). Focusing on the cases at \(h/h_{f}>1.0\), \(P_{WEC}\) is less than the approximation line in the range of \(P_{wave}<20\) W, while \(P_{WEC}\) in the range of \(P_{wave}>20\) W exceeds the approximation line, occasionally. It implies that the effects of \(h/h_{f}\) on \(P_{WEC}\) become smaller under the relatively large \(P_{wave}\) conditions although the condition of \(h/h_{f}>1.0\) tends to become the invalid pattern of the flap and decrease \(P_{WEC}\) in a relatively small \(P_{wave}\). However, most cases of \(h/h_{f}>1.0\) in Figure 18b are confined by the cases of \(T/T_{f}=1.3\) and 1.5 in Figure 18a. This was because only pattern A was analyzed for \(k_{e}\) and \(P_{WEC}\) in this study. The results of pattern B, which is a valid pattern to generate electricity normally as well, are not included. To more clearly identify the capability of the power generation under the condition of \(h/h_{f}>1.0\), the emergence ratio of each pattern depending on \(h/h_{f}\) and \(T/T_{f}\) was investigated. Table 4 presents the number of emergences of each pattern for \(h/h_{f}\) and \(T/T_{f}\). For instance, \"4 (6.1)\" in the row of pattern A for the \(T/T_{f}=0.7\) column indicates that the number of pattern As that emerged was four under the condition of \(T/T_{f}=0.7\) and the percentage of the occurred number (=4) of pattern A over the total number (=66) of experiments for \(T/T_{f}=0.7\) was 6.1%. On the other hand, \"2 (50.0)\" in the row of pattern A for the \(h/h_{f}=0.93\) column denotes that two cases among the total number of pattern As emerging under the condition of \(T/T_{f}=0.7\) were observed for \(h/h_{f}=0.93\), and the percentage is 50%. Figure 18: Relationship between \(P_{wave}\) and \(P_{WEC}\) depending on (**a**) \(T/T_{f}\), and (**b**) \(h/h_{f}\).