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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.
Dissipation of Solitary Wave Due To Mangrove Forest: A Numerical Study by Using Non-Dispersive Wave Model Didit Adytia; Semeidi Husrin; Arnida Lailatul Latifah
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 24, No 1 (2019): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (734.02 KB) | DOI: 10.14710/ik.ijms.24.1.41-50

Abstract

In this paper, we study a dissipation of solitary wave due to mangrove forest by using numerical simulation. Here, the solitary wave is chosen to represent tsunami wave form.  To simulate the wave dynamic, we use the non-dispersive Nonlinear Shallow Water Equations (NSWE). The model is implemented numerically by using finite volume method in a momentum conservative staggered grid. By using the proposed numerical scheme, the numerical code is able to simulate solitary wave breaking phenomenon. Wave dissipation due to mangrove forest is modelled as bottom roughness with an approximate value of manning roughness, which is derived from the classical Morisson’s formula. To test the modelled dissipation by mangrove forest, we reconstruct a physical experiment in hydrodynamic laboratory where a solitary wave propagates above a sloping bottom, which has a parameterized mangrove in the shallower part.  Two cases are performed to test the performance of the numerical implementation, i.e. the non-breaking and breaking solitary waves. Results of simulation agree quite well with the measurement data. The results of simulation are also analyzed quantitatively by calculating errors as well as correlation with the measurement data. Moreover, to investigate effects of wave steepness on solitary wave, to the reduction of wave energy, we perform numerical investigation. Various solitary waves with different wave steepness are simulated to see their effects on amplitude and energy reduction due to mangrove forest.
Performansi Implementasi Numerik Metode Pseudo Spectral pada Model Gelombang 1D Boussinesq Didit Adytia
Indonesia Journal on Computing (Indo-JC) Vol. 2 No. 1 (2017): Maret, 2017
Publisher : School of Computing, Telkom University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21108/INDOJC.2017.2.1.164

Abstract

In the design of a numerical wave tank, it is necessary to use an accurate wave model as well as to choose an accurate and efficient numerical scheme for implementing the model. In this paper, we use a Pseudo-Spectral (PS) implementationfor a wave model so called Variational Boussinesq Model. The implementation is aimed to obtain a higher time efficiency in the calculation of wave simulations. The performance  of the PS implementation  is compared in CPU-time with a Finite Element (FE) implementation of the wave model for simulating a focusing wave group. Results of both implementations give a good agreement with wave data from laboratory experiment. The PS-implementation gives more efficient CPU-time compared to the FE-implementation.
Momentum Conservative Scheme for Simulating Wave Runup and Underwater Landslide Didit Adytia
Indonesia Journal on Computing (Indo-JC) Vol. 4 No. 1 (2019): Maret, 2019
Publisher : School of Computing, Telkom University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21108/INDOJC.2019.4.1.250

Abstract

This paper focuses on the numerical modelling and simulation of tsunami waves triggered by an underwater landslide. The equation of motion for water waves is represented by the Nonlinear Shallow Water Equations (NSWE). Meanwhile, the motion of underwater landslide is modeled by incorporating a term for bottom motion into the NSWE. The model is solved numerically by using a finite volume method with a momentum conservative staggered grid scheme that is proposed by Stelling & Duinmeijer 2003 [12].  Here, we modify the scheme for the implementation of bottom motion. The accuracy of the implementation for representing wave runup and rundown is shown by performing the runup of harmonic wave as proposed by Carrier & Greenspan 1958 [2], and also solitary wave runup of Synolakis, 1986 [14], for both breaking and non-breaking cases. For the underwater landslide, result of the simulation is compared with simulation using the Boundary Integral Equation Model (BIEM) that is performed by Lynett and Liu, 2002 [9].
Numerical Simulation of Soliton Collision by using 1D Boussinesq Model Didit Adytia; Four Saputra BM
Indonesia Journal on Computing (Indo-JC) Vol. 4 No. 2 (2019): September, 2019
Publisher : School of Computing, Telkom University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34818/INDOJC.2019.4.2.335

Abstract

Soliton or solitary wave is a physical phenomenon in which a wave propagates without changing of form in a dispersive media. It is a condition when effects of nonlinearity is balanced with effects of dispersion. Therefore solitary wave propagation is a standard test for testing nonlinearity and dispersiveness of a wave model and its numerical implementation. One interesting case of the soliton phenomenon is the soliton collision which is an interaction between two solitary waves facing each other and producing a high impact wave. The phenomenon can be used to study tsunami wave interactions. In this paper we study the phenomenon by using numerical approach. We use a nonlinear dispersive 1D Boussinesq model that is implemented numerically by using Finite Element implementation in a collocated grid. The accuracy of the implementation is test by simulating two test cases of solitary wave, i.e. the propagation of solitary wave againsts analytical soliton solusion of Korteweg-de Vries (KdV) and the collision of two identical solitary waves. Results of simulations are also compared with results of the nonlinear nondispersive Shallow Water Equations (SWE).
Performansi Implementasi Paralel OpenMP pada Persamaan Air Dangkal 2D untuk Simulasi Gelombang Runup Didit Adytia; Novalianda Jeriano
Indonesia Journal on Computing (Indo-JC) Vol. 5 No. 1 (2020): Maret, 2020
Publisher : School of Computing, Telkom University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34818/INDOJC.2020.5.1.395

Abstract

Terdapat banyak aliran dangkal di alam seperti tsunami, aliran banjir, aliran pada sungai, pasang surut air laut, dan sebagainya. Aliran dangkal dapat disimulasikan dengan menggunakan Persamaan Air Dangkal atau Shallow Water Equations (SWE). Salah satu fenomena nonlinear yang penting dalam aliran dangkal adalah fenomena runup. Khususnya untuk menyimulasikan fenomena runup secara akurat, perlakuan khusus pada implementasi numerik dari model gelombang harus dilakukan. Pada artikel ini, persamaan SWE diimplementasikan dengan metode Finite Volume pada grid komputasi dengan model momentum conservative staggered grid. Untuk meningkatkan performasi komputasi terutama untuk menyimulasikan domain komputasi yang besar dengan resolusi grid tinggi, pada paper ini skema numerik tersebut diimplementasikan dengan metode arsitektur OpenMP. Performansi algoritma paralel dikuantifikasi dengan menghitung speedup dan efisiensi. Dari hasil paralelisasi tersebut, didapatkan efisiensi pada waktu komputasi untuk kasus-kasus dengan jumlah grid komputasi yang besar.
Wind Wave Prediction by using Autoregressive Integrated Moving Average model : Case Study in Jakarta Bay Didit Adytia; Alif Rizal Yonanta; Nugrahinggil Subasita
International Journal on Information and Communication Technology (IJoICT) Vol. 4 No. 2 (2018): December 2018
Publisher : School of Computing, Telkom University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21108/IJOICT.2018.42.300

Abstract

Prediction of wind wave is highly needed to support safe navigation, especially for ship. Besides that, loading and unloading activities in a harbour, as well as for design purpose of coastal and offshore structures, data of prediction of wave height are needed. Based on its nature, the wind wave has random behaviour that is highly depending on behaviour of wind as the main driving force. In this paper, we propose a prediction method for wind wave by using Autoregressive Integrated Moving Average or ARIMA. To obtain historical data of wind wave, we perform  wave simulation by using a phase-averaged wave model SWAN (Simulating Wave Near Shore).  From the simulation, time series of wind wave is obtained. The prediction of wind wave is performed to calculate forecast of 24  hours ahead. Here, we perform wind wave prediction in a location in Jakarta Bay, Indonesia. We perform several combination of ARIMA model to obtain best fit model for wind wave prediction in the location in Jakarta Bay. Results of prediction show that ARIMA model give an accurate prediction especially for short term prediction.
Prospek dan Keefektifan Penggunaan Google Classroom untuk Pembelajaran: Evidence dari SMP Pajajaran 1 Bandung deni saepudin; didit adytia; kemas muslim
Charity : Jurnal Pengabdian Masyarakat Vol 4 No 2 (2021): Charity-Jurnal Pengabdian Masyarakat
Publisher : PPM Universitas Telkom

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25124/charity.v4i2.3436

Abstract

Akibat pandemi Covid-19, masyarakat diminta untuk menjaga jarak fisik (physical distancing) untuk mencegah penularan. Salah satu konsekwensi dari keharusan menjaga jarak fisik ini adalah proses pembelajaran tidak dilakukan di sekolah, namun dilakukan dari rumah melalui media daring. Namun, belum semua sekolah siap melaksanakan pembelajaran daring. Salah satu faktor ketidaksiapan pembelajaran daring adalah pengetahuan/keterampilan guru dalam memanfaatkan media pembelajaran daring. Ada beberapa media online yang dapat digunakan untuk proses pembelajaran daring, salah satunya adalah Google Classroom. Dengan keterampilan para guru dalam memanfaatkan Google Classroom, proses pengajaran daring masih dapat berlangsung meskipun dengan banyak keterbatasan, baik keterbatasan perangkat maupun keterbatasan jaringan. Sampai saat ini, pandemi Covid-19 masih berlangsung dan belum diketahui kapan berakhir. Dengan keterampilan memanfaatkan Google Classroom, SMP Pajajaran 1 Bandung masih dapat melaksanakan pembelajaran daring. Pembelajaran ini juga dapat menjadi pelengkap proses pembelajaran konvensional di saat normal setelah pandemi berakhir dan ada potensi menggeser hasil studi sebelumnya yang menyebutkan pembelajaran dengan platform Google Form tidak terlalu efektif
Penerapan Aplikasi Pembelajaran Berbasis Multimedia untuk Menunjang Proses Belajar Mengajar di SD Negeri Kertasari 01 Kabupaten Bandung Dede Tarwidi; Putu Harry Gunawan; Didit Adytia
Charity : Jurnal Pengabdian Masyarakat Vol 3 No 2 (2020): Charity - Jurnal Pengabdian Masyarakat
Publisher : PPM Universitas Telkom

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25124/charity.v3i2.2357

Abstract

Makalah ini menyajikan penerapan aplikasi pembelajaran interaktif berbasis multimedia untuk menunjang proses pelajar pengajar di SD Negeri Kertasari 01 Kabupaten Bandung. Penerapan aplikasi pembelajaran ini dituangkan kedalam sebuah pelatihan pembuatan konten pembelajaran interaktif dengan multimedia. Masyarakat sasar yang dijadikan sebagai mitra adalah guru-guru SD Negeri Kertasari 01 Desa Tarumajaya Kecamatan Kertasari Kabupaten Bandung yang jaraknya sekitar 42 km dari Telkom University. Permasalahan yang dihadapi oleh masyarakat sasar adalah kurangnya media interaktif yang menunjang proses belajar mengajar, dalam satu kelas jumlah siswa terlalu banyak, proses penyampaian materi masih menggunakan papan tulis, siswa masih menggunakan buku ajar yang konvensional, keterbatasan waktu belajar siswa di sekolah. Untuk mengatasi permasalahan-permasalahan tersebut, salah satu solusinya adalah dengan pembuatan materi ajar interaktif berbasis teknologi multimedia. Hal inilah yang mendorong kami untuk memberikan pelatihan bagi para guru SD Negeri Kertasari 01 dalam pembuatan materi ajar dengan bantuan multimedia. Untuk mengukur apakah pelatihan ini memberikan pengaruh signifikan terhadap kemampuan peserta pelatihan dalam membuat materi ajar berbasis multimedia, kami melakukan observasi kemampuan peserta sebelum dan sesudah pelatihan. Hasil observasi kemudian dianalisis menggunakan t-test. Hasil dari analisis menunjukkan terdapat cukup bukti dengan tingkat kesalahan 5% bahwa ada perubahan yang signifikan dalam pelatihan pembuatan konten pembelajaran interaktif berbasis multimedia.
Digitalisasi Pelayanan Posyandu Melalui Sistem Informasi Posyandu Berbasis Website di Posyandu Anyelir RW 09 Kelurahan Burangrang Kecamatan Lengkong Kota Bandung Tatang Mulyana; Nopendri Nopendri; Seno Adi Putra; Tien i Fabrianti Kusumasari; Hanif Fakhrurroja; Setyorini Setyorini; Didit Adytia; Widianto Soekarnen; Derry Destian
Charity : Jurnal Pengabdian Masyarakat Vol 5 No 1 (2022): Charity-Jurnal Pengabdian Masyarakat
Publisher : PPM Universitas Telkom

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25124/charity.v5i1.3632

Abstract

Posyandu adalah wadah pemberdayaan masyarakat yang diprakarsai oleh masyarakat dan dikelola oleh masyarakat bersama Pemerintah Desa/Kelurahan untuk memberikan kemudahan memperoleh pelayanan kesehatan masyarakat. Banyaknya sistem pelaporan dari Posyandu terkadang menjadi data yang tidak dianalisa secara baik. Hal ini dikarenakan rekapitulasi dan pengumpulan datanya terkadang tidak tepat waktu. Salah satu upaya yang dapat dilakukan untuk memperbaiki hal tersebut adalah diwujudkan melalui sistem teknologi informasi. Sistem ini, dikenal dengan istilah digitalisasi, membantu analisa dari data secara cepat sehingga petugas kesehatan dimudahkan dalam melakukan pekerjaannya. Pengabdian Masyarakat yang dilakukan ini bekerjasama dengan PT Mahawangga Winaya Indonesia melakukan digitalisasi pengisian data kader posyandu dan pengumpulan data bayi dan balita. Pengabdian ini terdiri dari tiga kegiatan utama yang berurutan, yaitu pembuatan program, pengujian, dan pelatihan. Kegiatan pembuatan program dan pengujian sudah dapat dilaksanakan, namun untuk kegiatan selanjutnya, yaitu berupa kegiatan pelatihan belum dapat dilaksanakan.