Judul: Analisis Dampak Bencana Tsunami dan Perencanaan Jalur Evakuasi (Studi Kasus: Kabupaten Sukabumi)
Abstrak: Sukabumi dikategorikan wilayah rawan bencana yang dilintasi oleh Sesar Cimandiri sehingga menyebabkan gempa bumi yang dapat menimbulkan bencana lanjutan berupa tsunami dengan prediksi ketinggian mencapai 20 meter. Penelitian bertujuan mengetahui luasan wilayah dan penutup lahan terdampak, jumlah penduduk erdampak, serta perencanaan mitigasi yang diperlukan. Perhitungan dampak dilakukan dengan memodelkan inundasi ketinggian run-up tsunami 10m, 15m, dan 20m. Permodelan inundasi juga digunakan untuk mengetahui jumlah penduduk terdampak dengan aplikasi InaSafe dan QGIS. Informasi dari InaSafe digunakan untuk perencanaan lokasi shelter yang dapat memenuhi kapasitas serta jangkauan bagi penduduk terdampak tsunami. Hasil permodelan inundasi menunjukkan 9 kecamatan Sukabumi terdampak dengan total wilayah untuk skenario ketinggian run-up 10m, 15m, dan 20m berturut-turut seluas 6781,08 ha, 9703,75 ha, dan 12609,24 ha. Terdapat delapan jenis penutup lahan terdampak dengan kerugian ekonomi mencapai Rp. 3.158.526.457.779. Jumlah penduduk terdampak dari tiga skenario permodelan inundasi tersebut mencapai 135.100 jiwa sehingga perencanaan mitigasi didapatkan sebanyak 81 lokasi shelter darurat dengan 432 rute jalur evakuasi., Sukabumi is categorized as a disaster-prone area which is crossed by the Cimandiri Fault causing an earthquake which can cause a further disaster in the form of a tsunami with a predicted height of up to 20 meters. The research aims to determine the area and land cover affected, the number of affected people, and the necessary mitigation plans. The impact calculation was carried out by modeling the inundation of the tsunami run-up heights of 10m, 15m and 20m. Inundation modeling is also used to determine the number of people affected by the InaSafe and QGIS applications. Information from InaSafe is used for planning shelter locations that can meet the capacity and reach of tsunami-affected residents. The results of the inundation modeling show that 9 Sukabumi sub-districts are affected with a total area for the run-up height scenario of 10m, 15m and 20m, respectively 6781.08 ha, 9703.75 ha and 12609.24 ha respectively. There are eight types of affected land cover with economic losses reaching Rp. 3,158,526,457,779. The number of people affected from the three inundation modeling scenarios reached 135,100 people so that the mitigation plan obtained a total 81 location of emergency shelter locations with 432 evacuation route routes.
Keyword: tsunami, InaSafe, inundation, impact, mitigation

Judul: Analysis of Tsunami's Vulnerability Level and Mitigation Study Case: Tasikmalaya Regency's Coast
Abstrak: Kondisi geografis dan geologis menjadikan Indonesia rawan terhadap bencana tsunami. Salah satu wilayah pesisir yang memiliki potensi terjadinya tsunami adalah Pesisir Kabupaten Tasikmalaya. Berdasarkan hal tersebut, diperlukan adanya analisis tingkat kerawanan dan upaya mitigasi tsunami dengan tujuan memperkirakan luas wilayah yang terdampak tsunami, menganalisis tingkat kerawanan tsunami, memperkirakan jumlah penduduk yang terdampak, memetakan shelter dan jalur evakuasi tsunami, serta merencanakan upaya mitigasi struktural tsunami. Metode yang digunakan, tool model builder, weighted overlay, InaSAFE, dan Network Analyst. Hasil pemodelan menunjukkan tsunami setinggi 10, 15, dan 20 meter dapat menggenangi wilayah seluas 12,25 km2, 18,47 km2, dan 24,69 km2. Wilayah Pesisir Kabupaten Tasikmalaya didominasi oleh tingkat kerawanan rendah sebesar (54,62%), kemudian tingkat kerawanan sangat rendah (26,25%), tingkat kerawanan sedang (12,61%), tingkat kerawanan tinggi (5,30%), dan tingkat kerawanan sangat tinggi (1,22%). Jumlah penduduk terdampak tsunami setinggi 10, 15, dan 20 meter adalah sebanyak 8.280, 12.320, dan 17.770 orang. Terdapat 59 jalur evakuasi, dimana jalur yang termasuk kategori sedang sebanyak 27 jalur, kategori dekat 14 jalur, kategori sangat dekat dan jauh masing-masing sebanyak 9 jalur. Upaya mitigasi struktural yang dilakukan adalah dengan membuat green belt dan sea wall yang efektif mereduksi tsunami dengan tinggi di bawah 15 meter., Geographical and geological conditions make Indonesia vulnerable to tsunami disasters. One of the coastal areas that has the potential for a tsunami is Tasikmalaya Regency’s Coast. It is necessary to analyze tsunami’s vulnerability and mitigation to describing the area affected by the tsunami, analyzing the level of tsunami vulnerability, estimating the number of people affected, mapping shelters and tsunami exit routes, and planning structural tsunami mitigation. Methods used, model builder, weighted overlay, InaSAFE, and Network Analyst. The results show that tsunami as high as 10, 15 and 20 meters can inundate areas of 12,25 km2, 18,47 km2 and 24,69 km2. Tasikmalaya Regency’s Coast is dominated by a low level of vulnerability (54,62%), then a very low level of vulnerability (26,25%), a medium level of vulnerability (12,61%), a high level of vulnerability (5,30%), and a very high level of vulnerability (1,22%). The number of people affected by tsunamis as high as 10, 15 and 20 meters was 8.280, 12.320 and 17.770 people. There are 59 exit routes, which there are 27 routes in the medium category, 14 routes in the near category, and 9 routes in the very near and far categories. The structural mitigation efforts carried out are by creating a green belt and sea wall which are effective in reducing tsunamis with a height of below 15 meters.
Keyword: kerawanan, mitigasi, tsunami, inundasi

Judul: Characterizations of low alloy steel sae 4422  plated with chromic acid (Cro3)
Abstrak: Characterizations of low alloy steel SAE 4422 plated with chromic acid (CrOrO3) was use Optical Microscopy (OM), Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD), RD),Energy Dispersive Analysis of X-Ray (EDAX), Hardness Test and Roughness Test. Microstructures analysis exhibits cracks and grain boundaries microcracks as a characteristics of chrome metal found at plating metal. Perlite and Ferrite as grains of steel found at base metal with grain boundaries around it. Phase analysis of plating metal appropriate to chrome metal with lattice constant (a) is 2.559 Å and phase analysis of base metal appropriate to iron ferrite with lattice constant (a) is 3.318 Å. Both plating and base metal have cubic system. Chemical analysis of plating metal at surface section exhibits that cracks area have highest value of carbon element compare with grains and grains boundaries area. While chemical analysis of base metal at cross section exhibits that perlite have highest value of carbon element compare with ferrite and grain boundaries. The hardness value of plating metal at surface section and cross section are 753 and 637 VHN. While, the hardness value of base metal and interface area at cross section are 205 and 373 VHN. The roughness value at measurement points of chrome surface for as received sample are 0.445 μm. Observation used Optical Microscopy and Scanning Electron Microscopy exhibits surface irregularities combine to form surface texture of plating metal at surface section.
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