This research is conducted to examine the transmission wave and energy dissipation of a box culvert-type slotted breakwater, which is designed as a breakwater structure with a watertight wall at the top and a box culvert type hole at the bottom. The process involves physical modeling of this structure in the laboratory. The hole and wave parameters are varied to determine the breakwater performance. The results show that the transmission coefficient (KT) value is reduced as the relative hole height (hL/d) value is decreasing and the relative hole length (B/L) and wave steepness (H/L) values are increasing. The energy dissipation coefficient (KD) value increases with an increment in hL/d, H/L, and B/L but starts to decrease after reaching the maximum, which is the optimum H × B/L2 value. This optimum value is found to be 0.0034(hL/d)2.618 depending on the (hL/d) value, while the maximum KD value is recorded to be 0.70.

Today's young people are no stranger to gadgets such as smartphones and tablets. Currently, the device among teenagers is not only used as a communication tool, but also multifunctional. One of them is the camera that users use to record personal moments, besides that social media is also a special attraction for teenagers to socialize or show their creativity.Behind that there are many impacts caused by the gadget itself, both negative and positive impacts. For the research method, I will use qualitative methods, by approaching adolescents. This is to obtain actual data from the respondents without any element of coercion. Here I play as a teenager who seems to be a part of them, then slowly questions how important gadgets are among them, while seeing and analyzing this problem in order to get a solution to the impact caused by gadgets. The real problem is that gadgets do help us in carrying out daily activities. However, there are still many teenagers who abuse the function of the gadget itself, they even make gadgets as their main tool in their daily life. Almost every teenager already has a device. Students with supplies often bring supplies to school. It is not uncommon for children to use cutlery in class.

Gelombang datang akan mengalami difraksi saat melewati sebuah struktur yang relatif besar. Gelombang difraksi akibat breakwater ambang rendah half cylinder akan dihamburkan secara radial arah normalnya berupa gelombang hambur (scatter). Penelitian ini dilakukan untuk mengetahui kinerja breakwater ambang rendah half cylinder berdasarkan nilai koefesien hambur (scatter) gelombang (Ks) yang terjadi. Analisis potensial gelombang dilakukan untuk menyelesaikan persamaan pengatur aliran secara analitik menggunakan potensial kecepatan sebagai variabel dasar dengan menerapkan kondisi syarat batas yang ada. Hasil analitik kemudian diverifikasi menggunakan metode numerik. Hasil penelitian menunjukan bahwa koefesien scatter (Ks) breakwater ambang rendah half cylinder akan meningkat jika periode gelombang (T) dan nilai parameter a/h (a = jari-jari half cylinder, h = kedalaman air) bertambah besar. Nilai koefesien scatter (Ks) akan bernilai maksimum jika nilai ka 2 (k = wave number). Hasil verifikasi menunjukan bahwa metode analitik dan numerik menggunakan potensial kecepatan sebagai variabel dasar mendekati hasil yang sama jika nilai a/h ≤ 0,50.