Abstract. A coupled wave-vegetation simulation is presented for the moving effect of the coastal vegetation on tsunami wave height damping. The problem is idealized by solitary wave propagation on a group of emergent cylinders. The numerical model is based on general Reynolds-averaged Navier-Stokes equations with renormalization group turbulent closure model by using volume of fluid technique. The general moving object (GMO) model developed in computational fluid dynamics (CFD) code Flow-3D is applied to simulate the coupled motion of vegetation with wave dynamically. The damping of wave height and the turbulent kinetic energy along moving and stationary cylinders are discussed. The simulated results show that the damping of wave height and the turbulent kinetic energy by the moving cylinders are clearly less than by the stationary cylinders. The result implies that the wave decay by the coastal vegetation may be overestimated if the vegetation was represented as stationary state.
Abstract. A coupled wave-vegetation simulation is presented for the moving effect of the coastal vegetation on tsunami wave height damping. The problem is idealized by solitary wave propagating on a group of emergent cylinders. The numerical model is based on general Reynolds-averaged Navier-Stokes equations associated with renormalization group turbulent closure model by using volume of fluid technique. The general moving object (GMO) model developed in CFD code Flow-3D is applied to simulate the coupled motion of vegetation with wave dynamically. The damping of wave height and the turbulent kinetic energy dissipation as waves passed over both moving and stationary cylinders are discussed. As comparing with the stationary cylinders, it obtains markedly less wave height damping and turbulent kinetic energy dissipation by the moving cylinders. The result implies that the wave decay by the coastal vegetation might be overestimated if the mangrove vegetation was represented as stationary state.
Indonesia needs to improve its irrigation system by implementing respectable technology. Recently, Indonesian irrigation systems have intended to switch from analog to digital technology. However, it appeared that Indonesia was having some issues applying digital technology in many areas. For instance, delivering water from water sources to irrigation subversives requires a computer infrastructure. A manual water level monitoring tool has been used in irrigation canals to gauge the water level that flows through them. The major goal of this project is to design a digital measuring device for water level and water temperature in the irrigation channel. The appropriate information must be entered into the irrigation channels. An experimental investigation has been conducted into the accuracy of digital instrument design for detecting water level and water temperature in irrigation channels. The creation of the digital water level measurement design will be tested against manual measurement to determine the percentage difference. The percentage difference between the traditional water level measurement and the digital water level measurement is the anticipated outcome. It is possible to infer that it is crucial to use digital tools, especially when determining the water level in irrigation channels.
Beberapa model vegetasi gelombang disajikan dalam peneitian ini untuk mensimulasikaninteraksi gelombang soliter dengan vegetasi fleksibel. CFD berdasarkan model tiga dimensiNavier-Stokes (RANS) Reynolds dengan model turbulen renormalization group (RNG) dikaitkandengan metode volume of fluid (VOF) diterapkan untuk simulasi numerik. Penelitian ini mencobauntuk memberikan model fisik yang lebih baik dengan mempertimbangkan silinder fleksibelsebagai vegetasi untuk mensimulasikan kinerja redaman vegetasi. Transformasi gelombang dankarakteristik variasi medan alir gelombang soliter yang menyebar di kedua silinder kaku dansilinder fleksibel adalah topik yang akan dibahas. Hasil simulasi numerik menunjukkan bahwaketika gelombang soliter merambat disekitar vegetasi yang kaku dan fleksibel, energi kinetikturbulen dan laju disipasinya dihasilkan karena interaksi antara gelombang dan silinder.Selanjutnya, hasilnya menunjukkan bahwa vegetasi kaku memperoleh reduksi tinggi gelombangyang lebih besar daripada vegetasi fleksibel. Vegetasi kaku juga mengalami energi kinetikturbulen yang lebih besar daripada yang fleksibel. Hal ini menjadi catatan penting bahwa redamangelombang mungkin terlalu tinggi ketika mempertimbangkan sekelompok silinder kaku sebagaivegetasi pesisir untuk mensimulasikan dampak vegetasi terhadap redaman tsunami.
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