KAJIAN PERILAKU GELOMBANG AKIBAT ADANYA STRUKTUR TIANG PANCANG SILINDER MELALUI ANALISIS SPEKTRUM ENERGI. (Indonesian)

STUDY OF WAVE BEHAVIOR DUE TO CYLINDER PILE STRUCTURE THROUGH ENERGY SPECTRUM ANALYSIS. (English)

Breakwater structures are widely used for coastal protection from the blows of ocean waves that propagate to coastal areas. One of the breakwater innovations being developed is the pile structure. Piles are a replication of mangrove tree trunks that can reduce wave energy, so it is necessary to test their effectiveness in reducing wave energy. So the purpose of this study is to analyze the effectiveness of the pile structure by analyzing the wave behavior before and after colliding with the pile structure based on the wave theory division. Physical laboratory simulations have been carried out to obtain wave data that interacts with the pile structure. Furthermore, energy spectrum analysis is used to determine the energy spectrum of the incident wave, reflection and transmission of wave probe measurements in the form of time series data. Each energy spectrum is used to see the reflection and transmission capabilities of the pile structure from the reflection and transmission coefficients. The reflection and transmission coefficient values were estimated using a third degree polynomial equation resulting in RMSE = 0.087 and RMSE = 0.051 with the basic wave parameters being variable, namely wave height, wave period and water depth. The critical point of the polynomial equation shows the minimum reflection and transmission coefficient values when it is in the Cnoidal region and maximum when it is in the 2nd order Stokes region. [ABSTRACT FROM AUTHOR]

Struktur pemecah gelombang banyak dimanfaatkan untuk perlindungan pantai dari hantaman gelombang laut yang berpropagasi ke daerah pesisir pantai. Salah satu inovasi pemecah gelombang yang sedang dikembangkan yaitu struktur tiang pancang. Tiang pancang merupakan replikasi batang pohon bakau yang dapat meredam energi gelombang. Tujuan dalam penelitian ini untuk menganalisis efektivitas struktur tiang pancang dengan menganalisis perilaku gelombang sebelum dan sesudah bertabrakan dengan struktur tiang pancang berdasarkan pembagian teori gelombang. Simulasi laboratorium fisik telah dilakukan untuk mendapatkan data gelombang yang berinteraksi dengan struktur tiang pancang. Selanjutnya, dilakukan analisis spektrum energi untuk menentukan spektrum energi gelombang datang, refleksi dan transmisi dari pengukuran wave probe berupa data time series. Masing-masing spektrum energi digunakan untuk melihat kemampuan refleksi dan transmisi dari struktur tiang pancang dari koefisien refleksi dan transmisi. Nilai koefisien refleksi dan transmisi diestimasi dengan persamaan polinomial derajat tiga menghasilkan dan dengan variabel parameter dasar gelombang yaitu tinggi gelombang, periode gelombang dan kedalaman perairan. Titik kritis dari persamaan polinomial menunjukkan nilai koefisien refleksi dan transmisi minimum ketika berada pada daerah Cnoidal dan maksimum ketika berada pada daerah Stokes orde-2. [ABSTRACT FROM AUTHOR]

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