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All Journal Jurnal Teknik Sipil
Syamsidik, Syamsidik
Department of Civil Engineering, Syiah Kuala University

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PENILAIAN TINGKAT RISIKO BENCANA TSUNAMI UNTUK KAWASAN KOTA BANDA ACEH BERDASARKAN SKENARIO TSUNAMI DESEMBER 2004 Fauziah, Fauziah; Fatimah, Eldina; Syamsidik, Syamsidik
Jurnal Teknik Sipil Vol 3, No 2 (2014): Volume 3, Nomor 2, Januari 2014
Publisher : Department of Civil Engineering, Syiah Kuala University

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Realignment of Banda Aceh devastated by the tsunami has put forward the concept of disaster mitigation. As the city is aware of the disaster, the availability of disaster risk map is an essential requirement in developing sustainable development and disaster mitigation based. This research aims to generate a map of tsunami risk assessment by loading element of threat,  vulnerability, capacity using spatial data and information in the region of Banda Aceh. Risk analysis is conducted using a  semi-quantitative weighting factors and the index values arebased on the analysis conducted by BNPB and TDMRC-Unsyiah. Mapping analysis is conducted by overlaying layer(overlay) and vector-based GIS grid. Based on the results of the analysis show that the risk areas with low-to-high tsunami consists of 73 villages high with an area of each is 6.05 km2 (10%). 20.66 km2 (35%) and 16.23 km2. The area is not an area of 17.02 km2 risk or 28% of the total area of the city of Banda Aceh.
KAJIAN POLA SEBARAN SEDIMEN PADA SALURAN BANJIR SUNGAI KRUENG ACEH Alfaisal, Alfaisal; Syamsidik, Syamsidik; Masimin, Masimin
Jurnal Teknik Sipil Vol 6, No 3 (2017): Volume 6, Nomor 3, Mei 2017
Publisher : Department of Civil Engineering, Syiah Kuala University

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Abstract: Krueng Aceh River is one of the main river in Aceh Province located in Krueng Aceh River Basin Area (DAS) with in 17.800 Acre wide and 145 km length. In order to minimize the flood impact in Banda Aceh with 1.300 m3/s flood discharge design, 900 m3/s discharge has been redirected to Krueng Aceh river floodway while the rest had distributed to the Krueng Aceh existing river. Meanwhile for 900 m3/s of the flood discharge is distributed through the floodway from the diversion weir. It is worried that the water will reach the top of the dike in some location of the main river. It is because of the swallow in the estuary due to the sediment concentration. This research aims is to investigate the sediment distribution pattern, estimating volume of the deposited sediment. Furthermore, the investigation is also to find how the sediment transport occured while the flood. The flood simulation had been done by the Delft3D Model which combine with the hydrodynamics and the sediment transport calculation. This model use 20x20 m grid for the domain. Topography and bathimetry data were collected from Balai Wilayah Sungai Sumatera–I (BWSS-I). Sediment characteristic had been primerly collected in the field. Simulation results had shown that the sediment distribution pattern on Krueng Aceh river floodway has a particular pattern remain relatively on the right side of the estuary. The sediment increase of 868.236 m3 and produced 2.039.560 m3 massive erosion during 3 month simulation with flood scenario. The sedimentation process is smaller compared to the erosion. But the erosion only happen in the area with the greater than value of current. The simulation complimented by 5 years return flood design was uncapable to flush the sediment which deposited on the eastern side of the estuary. The phenomenon happened because of the river morphology with it meandering channel, not enough length of left jetty and the current that not equally distributed. The solution for this problem is by lengthening the left side of the jetty toward the breakwater and constructing the river training toward the current in the left side of the estuary. Abstrak: Krueng Aceh merupakan salah satu sungai besar di Provinsi Aceh, berada dalam wilayah Daerah Aliran Sungai (DAS) Krueng Aceh dengan luas DAS 17.800 Ha dan panjang sungai 145 Km. Untuk meminimalisir terjadinya banjir di kota Banda Aceh dengan debit banjir rancangan sebesar 1.300 m3/detik, maka untuk debit banjir 400 m3/detik dialirkan melalui Sungai Kr. Aceh existing. Sedangkan untuk debit banjir sebesar 900 m3/detik dialirkan melalui saluran banjir dari bendung pelimpah banjir (Diversion Weir). Pada beberapa lokasi di sungai induk dikhawatirkan elevasi muka air akan mencapai puncak tanggul. Ini akibat dari pendangkalan yang terjadi di bagian muara dengan adanya konsentrasi sedimen. Penelitian ini bertujuan untuk mengetahui pola sebaran sedimen pada bagian hilir saluran banjir, mengetahui volume sedimen yang terkonsentrasi setelah kejadian banjir dan mengetahui bagaimana pergerakan sedimen terjadi setelah banjir. Penelitian dilakukan dengan simulasi numerik menggunakan software Delft3D yang berfungsi sebagai model traspor sedimen pada lokasi simulasi. Model ini menggunakan grid  dengan ukuran 20 m x 20 m. Data yang digunakan adalah data topografi dan batimetri dari Balai Wilayah Sungai Sumatera-I dan parameter sedimen dari hasil pengambilan sampel di lokasi kajian. Hasil simulasi menunjukkan bahwa, pola sebaran sedimen pada saluran banjir sungai Krueng Aceh memiliki pola yang relatif tetap khususnya pada sisi kanan muara, peningkatan sedimen setelah terjadinya banjir sebesar 868.236 M3 dan yang tergerus sebesar 2.039.560 M3. Artinya volume sedimen yang mengendap lebih kecil dari pada yang tergerus. Namun yang tergerus tersebut hanya pada jalur dengan arus yang lebih besar. Hasil dari simulasi dengan menggunakan debit banjir rancangan lima tahunan, sedimen yang berada di sisi kanan muara tidak mampu tergelontor ke laut. Hal ini diakibatkan karena bentuk meander saluran yang berbelok, jetty di sisi kiri yang kurang panjang dan arus banjir yang tidak merata. Upaya yang dapat dilakukan yaitu dengan memperpanjang jetty sisi kiri  sampai kedalaman gelombang pecah dan membuat river training untuk mengarahkan arus ke bagian sedimen di sisi kanan muara.
MONITORING REHABILITASI GARIS PANTAI DI UTARA KECAMATAN JOHAN PAHLAWAN-ACEH BARAT Hidayat, Aminullah; Syamsidik, Syamsidik; Masimin, Masimin
Jurnal Teknik Sipil Vol 5, No 3 (2016): Volume 5, Nomor 3, Mei 2016
Publisher : Department of Civil Engineering, Syiah Kuala University

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Abstract : Ocean Tsunami on 2004 affects morphology on the shoreline around Meulaboh City with changing the position of the shoreline from the previous conditions to shift toward the mainland. In the last ten years several measurements has been taken to protect and preserve the shoreline, one of them by making a protection structure. The research objective, among others, reviewing changes in the coastline due to tsunami waves and sediment transport processes and review the changes and building envelope performance coastline. Research conducted on sediment transport processes are studied in long shore along the coast. The magnitude of the effect of sediment transport in the building envelope shoreline littoral drift indicates that the process has a passenger capacity large enough to cause accretion and buildup of sediment in a specific area. Stage of methodology was conducted by determine the study area and perform calculations based on the wave fetch. Then proceed with the calculation of sediment transport formulas are available. Shoreline change analysis with Google Earth satellite image time series and tracking with GPS devices along the beach and aided by digitization software ArcGIS. Technical documents and data building coastal protection can be obtained from the relevant agencies. Interviews were conducted by means of in-depth interviews with stakeholders and local communities. The results aim to be achieved from this research is provide information that describes the process of change and restoration of shoreline that will be presented in the form of images and calculating results. The results could be used to be consideration of the type of construction. Furthermore could be used for coastal protection and spatial planning for the coastal zone management related to sediment transport processesKeywords : Tsunami, Coastal Recovery, Longshore Sediment Transport, Coastal Structures Performance.Abstrak : Gelombang Tsunami Tahun 2004 telah menyebabkan perubahan secara geografis pada garis pantai di pesisir utara kecamatan Johan Pahlawan sekitar Kota Meulaboh.Letak garis pantai mengalami perubahan dari kondisi sebelumnya bergeser ke arah daratan. Dalam sepuluh tahun terakhir ini beberapa tindakan dilakukan untuk melindungi dan mempertahankan garis pantai, salah satunya dengan membangun bangunan pengaman pantai. Tujuan penelitian antara lain meninjau perubahan garis pantai akibat gelombang tsunami dan proses sediment transport dan meninjau perubahan dan kinerja bangunan pelindung garis pantai. Penelitian dilakukan terhadap proses sediment transport yang dikaji secara long shore di sepanjang pantai. Besarnya pengaruh sediment transport pada bangunan pelindung garis pantai mengindikasi bahwa proses littoral drift memiliki daya angkut yang cukup besar sehingga dapat menyebabkan akresi dan penumpukan sedimen di kawasan tertentu. Metodologi penelitian dilakukan adalah menentukan lokasi studi dan melakukan perhitungan gelombang berdasarkan fetch. Kemudian dilanjutkan dengan perhitungan sediment transport dengan formula yang tersedia. Perubahan garis pantai dianalisa dengan citra satelit Google Earth time series dan melakukan tracking dengan alat GPS sepanjang pantai dan dibantu dengan digitasi software ArcGIS. Dokumen teknis dan data bangunan pelindung pantai dapat diperoleh dari instansi terkait. Wawancara dilakukan dengan cara in-depth interview dengan pihak terkait dan masyarakat setempat. Hasil yang ingin dicapai dari penelitian ini adalah tersedianya informasi yang menjelaskan proses perubahan dan pemulihan garis pantai yang akan disajikan dalam bentuk gambar dan hasil perhitungan. Hasil penelitian ini dapat digunakan untuk dasar penentuan jenis konstruksi pengaman pantai dan perencaaan tata ruang di kawasan pesisir terkait proses sediment transport.Kata kunci : Tsunami, Coastal Recovery, Longshore Sediment Transport, Kinerja Bangunan Pantai.