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All Journal Journal of Engineering and Technological Sciences Al-Syakhshiyyah : Jurnal Hukum Keluarga Islam dan Kemanusiaan Bulletin of Geology
Hamzah Latief
Study Program of Oceanography, Institut Teknologi Bandung
Religion Humanities Earth & Planetary Sciences Energy Engineering Law, Crime, Criminology & Criminal Justice

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Analysis of Surface Wave Attenuation in Mangrove Forests Hadi, Safwan; Latief, Hamzah; Muliddin, Muliddin
Journal of Engineering and Technological Sciences Vol 35, No 2 (2003)
Publisher : ITB Journal Publisher, LPPM ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (799.896 KB) | DOI: 10.5614/itbj.eng.sci.2003.35.2.1

Abstract

This paper presents an analytical study on surface wave attenuation in mangrove forest using analytical model developed by Massel et.al. (1999). The energy dissipation in the frequency domain is determined by treating the mangrove forest as a random media with certain characteristics using the geometry of mangrove trunks and their locations. Initial nonlinear governing equations are linearized using the concept of minimalization in the stochastic sense and interactions between mangrove trunks and roots have been introduced through the modification of the drag coefficients. To see the effectiveness of the mangrove forest in attenuating wave energy the analytical model was applied to two types of mangrove forest i.e. Rhizophora and Ceriops forests. The resulting rate of wave energy attenuation depends strongly on the density of the mangrove forest, and on diameter of mangrove roots and trunks. More effective wave energy attenuation is shown by Rhizophora.
TELAAH MAQASID SYARIAH TERHADAP PUTUSAN MK NO. 22/PUU-XV/2017 TENTANG BATAS USIA NIKAH latief, hamzah
AL-SYAKHSHIYYAH Jurnal Hukum Keluarga Islam dan Kemanusiaan Vol 1, No 1 (2019): Aktualisasi Nilai Hukum Keluarga Islam dan Kemanusiaan di Era Disruptif
Publisher : IAIN BONE

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (612.442 KB) | DOI: 10.35673/asyakhshiyyah.v1i1.210

Abstract

AbstractThis study is a review of the decision of the Mahkamah Konstitusi (MK) No.22 / PUU-XV / 2017 about the age limit of marriage. The marriage age formulation carried out by the Mahkamah Konstitusi through recommendations in its decision to be revised up to the age of female marriage between 18-19 years. This study is a normative study with a library analysis of the Mahkamah Konstitusi decision regarding the age of marriage in the perspective of maqasid syari'ah. The results of the study indicate that the Mahkamah Konstitusi decision No.22 / PUU-XV / 2017 regarding changes in the age of marriage for women is in line with the concept of maqasid syari'ah. Keywords: MK Decision; Age of Marriage; Maqasid Syari'ah.
NUMERICAL SIMULATION OF THE 2018 KRAKATAU TSUNAMI GENERATED BY FLANK COLLAPSE AND ASESSMENT OF TSUNAMI HEIGHT IN PANDEGLANG REGENCY Latief, Hamzah; ISNAENI, KHOLILLAH YUDICIA; PUTRI, MUTIARA RACHMAT; FAIZIN, HAEKAL YUSRIL; DIASTOMO, HANIF; Anwar, Iwan Pramesti
Bulletin of Geology Vol 7 No 1 (2023): Bulletin of Geology
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/bull.geol.2023.7.1.4

Abstract

This study aims to reconstruct the tsunami event on December 22, 2018, due to the eruption of Anak Krakatau Volcano, which caused a flank collapse and generated an underwater landslide. Then this landslide caused a tsunami that impacted the coast of the Sunda Strait, especially on the coast of Pandeglang Regency. Based on satellite imagery, it is known that the landslide source came from the southwestern part of Anak Krakatau's wall moving down the former caldera wall of the 1883 Krakatau volcanic eruption. The mount grew again and was known as Anak Krakatau Volcano and appeared above sea level in 1929 and continued to grow. Subsequently, several eruptions spewed sediment deposits that had accumulated on the edges and foot of the mount. These sediments increased and became unstable, causing flank collapse and triggering underwater landslides. Several simulation scenarios have been carried out to obtain the best model that can represent the 2018 Anak Krakatau Tsunami with landslide parameters, namely: the volume of the landslide is 0.276 km3, the duration of propagation is 410 seconds, the inclination angle is 8.2°, and the length of the landslide trajectory is 3435 meters. The waveform generated as a tsunami source is in the form of wave peaks in the direction of the slide and wave valleys on the back of the slide. Furthermore, this wave propagated in all directions but primarily focused on the southwest, i.e., Panaitan Island and Pandeglang Regency. Tsunami simulations show that the tsunami reached: Panaitan Island and Pandeglang Regency at 58-60 minutes, Kota Agung (Lampung) at 42 minutes, and Ciwandan (Banten) at 46 minutes after the landslide with a tsunami height of 5.01m, 0.9 m, and 0.7 m respectively, with a maximum tsunami wave height of 18.6 m on Panaitan Island. Furthermore, it is known that five areas in Pandeglang Regency fall into the high tsunami hazard category with a tsunami height of more than 3 m, namely Panaitan Island, Ujungkulon District, Sumur, Panimbang, and Labuhan. By accurately knowing the distribution of tsunami height and estimating the time of arrival of the tsunami in the affected area and the inundation area, an early warning system and mitigation efforts can be planned, such as spatial planning and other actions. Key words: Anak Krakatau tsunami, numerical simulation, flank collapse, underwater landslide, Pandeglang Regency
Co-Authors Anwar, Iwan Pramesti Diastomo, Hanif FAIZIN, HAEKAL YUSRIL Isnaeni, Kholillah Yudicia Muliddin Putri, Mutiara Rachmat Safwan Hadi