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ITS » Master Theses » Teknik Perencanaan Bangunan Laut - S2
Posted by eny at 06/01/2007 14:49:19  •  18255 Views


ASSESSING CHARACTERISTICS OF RELATIONSHIP AMONG WAVE HEIGHT ENERGY AND SLOPE RATIO OF BANYUWANGI 1994 EARTHQUAKE-GENERATED TSUNAMI

Author :
BAEDA, ACHMAD YASIR 




ABSTRAK

Fakta sejarah telah membuktikan kepulauan Indonesia adalah wilayah rawan bencana tsunami yang dibangkitkan oleh gempa bumi. Oleh karena itu dirasakan perlunya sebuah warning system yang dapat memberikan peringatan kepada masyarakat pantai akan bahaya tsunami. Salah satu diantara kajian-kajian dalam bidang tsunami yang menyangkut proses propagasi tsunami dan merupakan bagian penting dalam pembuatan warning system adalah kajian tentang efek perbedaan kedalaman terhadap fluktuasi tinggi gelombang dan energi. Kajian ini bertujuan untuk memetakan karakteristik hubungan antara tinggi gelombang dan energi tsunami dengan indikator slope ratio selama proses propagasi yang akan menjadi input dasar pada penentuan letak buoy sensor pencatat tinggi gelombang sebagai salah satu bagian dari sebuah warning system. Simutasi sebagai alat kajian yang dipergunakan untuk meneliti efek slope ratio terhadap fluktuasi tinggi gelombang dan energi Banyuwangj 1994 earthquake-generated tsunami didasarkan atas program TUNAMI N3 untuk nearfield tsunami dengan metode finite difference skema leapfrog. Data bathymetri yang dipergunakan sebagai input simulasi mempunyai batasan daerah 8 - 11.5LS 111.7 - 114.8BT dengan skala 11000 pada dimensi grid 350 x 395. Dalam simulasi diasumsikan tsunami merupakan gelombang panjang linier paras laut konstan selama penjalaran gelombang laut akibat pasut dan angin diabaikan serta seabed halus. Analisa hasil simulasi dibatasi pada tiga lokasi yang terletak pada arah terpa 0 45dan 315. terhadap episentrum gempa dengan waktu terpa pada tiap lokasi antara 17 sampai 21 menit setelah mainshock. Pada simulasi ini didapatkan bahwa pada nilai slope ratio sama dengan 1088 terjadi rasio tinggi gelombang H2H1 dengan rasio energi tsunami E2Ei yang paling ekstrim dan keadaan ini mengindikasikan penjalaran tsunami. Adapun rentang amplifikasi E2E1 terhadap H2H1 di setiap nilai slope ratio yang sama rentang 106 -1206 adalah antara 11288 - 18119. Kedua hal ini hanya terjadi jika karena tiga hal 1 pola propagasi tsunami sama dengan arah terpa 2 pola kedalaman tegak lurus terhadap arah terpa dan 3 luas lokasi tinjauan yang mempunyai kedalaman relatif konstan memiliki luasan yang sama atau lebih besar dari kuadrat jarak antar nodal grid. Walaupun demikian hasil kajian ini tidak dapat diberlakukan secara umum pada setiap kejadian tsunami. Untuk itu diperlukan kajian-kajian yang lebih detail dan lebih mendekati kondisi sebenarnya baik untuk Banyuwangi 1994 maupun kejadian tsunami lainnya terutama dengan memasukkan pula pengaruh pasut dan gelombang laut yang diakibatkan oleh angin.


ABSTRACT

History has proved that Indonesian archipelago is one of hazardous earthquake-generated tsunami area in the world this implicates the need of a warning system which can alarmed coastal society if the hazard occurred. One of many tsunami assessments involving in propagation process and being an important part in the making of a warning system is the assessment of wave height and energy fluctuation due to the change of depth. The goal of this assessments is to find characteristics relationship among wave height energy and slope ratio as tsunami propagates these can be used as a basic input to find a suitable area for buoy sensor as a part of warning system. Simulation as an assessment tool for investigating wave height and energy fluctuation due to slope ratio of Banyuwangi 1994 earthquake-generated tsunami was based on TUNAMIN3 code for near field tsunami. This code is using leapfrog scheme of finite difference method. Digital bathymetric data which was used as a simulation input bound from 8 - 11.5S 111.7 - 114.8E with the scale 11000 and produced 350 x 395 grid area. In this simulation tsunami is assumed to be a linier long wave still water surface no current or wind wave and smooth seabed. Analysis of simulation results were directed at those associated with three specific area located at spring angle 0 45dan 315 spring time between 17 to 21 minutes after mainshock. The study discovered the maximum ratio of wave height H2H1 and tsunami energy E2Ei which indicates propagating tsunami on the observed area to occur when the value of slope ratio is equal to 1.088. Amplification of E2Ei due to H2H1 bounded from 112.88 to 181.19 at the same slope ratio value bounded from 1.06 to 1.206. Providentially it could only happen for three reason 1 tsunami propagation profile have the same pattern as to the spring pattern 2 the topographic pattern is upright 90 vertical to the spring pattern and 3 observed area having about constant depth have an area which is equal or greater than square distance between grid nodal. It should be noted that the assessment result can not be generalized to other tsunami cases. This study recommends that further assessments need to be carried out by taking into account of current and wind wave for Banyuwangi 1994 or other tsunami cases.



KeywordsTsunami ; Slope ratio ; Wave height ratio ; Tsunami energy ratio
 
Subject:  Gelombang laut
Contributor
  1. Prof. Dr. Ir. W. A. PRATIKTO, M.Sc.
    Dr. Ir. WISNU WARDHANA, M.Sc.,SE.
Date Create: 12/08/2001
Type: Text
Format: pdf ; 177 pages
Language: Indonesian
Identifier: ITS-Master-3100002014745
Collection ID: 3100002014745
Call Number: 551.470 24 Bae


Source
Theses Shipping Engineering RT 551.470 24 Bae k, 2001

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