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All Journal Jurnal Matematika & Sains JURNAL SUMBER DAYA AIR
Andonowati Andonowati
Program Studi Matematika, Fakultas Matematika dan Ilmu Pengetahuan Alam ITB
Civil Engineering, Building, Construction & Architecture Engineering Mathematics

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Perubahan Bentuk pada Perambatan Signal Bi-kromatik dan Pengaruhnya terhadap Amplitudo Maksimum Marwan Marwan; Andonowati Andonowati
Jurnal Matematika & Sains Vol 8, No 2 (2003)
Publisher : Institut Teknologi Bandung

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Abstract

We consider the signal propagation from a wave generation often simulated in hydrodynamic laboratories. As a particular case, we will study a deformation from the evolution of a bi-chromatic signal. The signal is a superposition of two mono-chromatics with different of frequencies. We use a KdV equation with exact dispersion as a model for uni-directional surface gravity waves. Using a direct expansion in the form of power series of the elevation signal amplitude gives a result to resonance in the third order. We correct this expansion using a modified Linstead-Poincare technique. From this, a non linear dispersion relating the wave number, amplitude and frequency can be derived. If the frequency different between the two mono-chromatics forming the bi-chromatics signal is small then the effect of third order side bands can dominate the second order terms. The coefficient of these terms contain an expression in the form of ()2/κqq. Deformations of bi-chromatic signal are significantly effected by this non linear dispersion as well as the side band terms. In this paper we will study the deformation of bi-chromatic signal propagation through the new approach called Maximal Temporal Amplitude (MTA).
Optimasi desain rencana tanggul lepas pantai NCICD di Teluk Jakarta terhadap kemungkinan tsunami akibat letusan Gunung Anak Krakatau Huda Bachtiar; Riam Badriana; Leo Sembiring; Didit Adytia; I Putu Samskerta; Andonowati Andonowati; E. van Groesen
JURNAL SUMBER DAYA AIR Vol 13, No 1 (2017)
Publisher : Bina Teknik Sumber Daya Air, Kementerian Pekerjaan Umum dan Perumahan Rakyat

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1581.595 KB) | DOI: 10.32679/jsda.v13i1.170

Abstract

The infrastructural plans in the Jakarta Bay to reduce risks of flooding in Jakarta city comprise a large sea dike that encloses a retention lake. Part of the planned dike has the shape of the iconic Garuda bird. This shape is based on NCICD Stage-B Master Plan, where the form shape has not been tested on hydraulic perspective. Therefore, testing of wave run-up has been investiagated to find the optimum form of the Garuda Shape. The simulation of wave run-up uses Hawassi Model, where the model is governed by Boussinesq wave equation with considering wave-wave interaction. This paper shows that if in the future an explosion of Anak Krakatau will occur with strength 1/4th of the original Karkatau 1883 explosion, wave crests of 11m and troughs of 6m may collide against the birds head. As an alternative example, a more optimized design of the dike is constructed that reduces the maximal wave effects considerably.
Co-Authors Didit Adytia E. van Groesen Huda Bachtiar I Putu Samskerta Leo Sembiring Marwan Marwan Riam Badriana