Judul: Pemetaan Area Terdampak Tsunami Menggunakan Sistem Informasi Geografis di Pesisir Kabupaten Kebumen
Abstrak: Kabupaten Kebumen merupakan salah satu daerah yang berpotensi tinggi terjadi gempa bumi dan tsunami karena letaknya yang berada tepat di atas zona subduksi lempeng Indo-Australia dengan lempeng Eurasia. Penelitian ini bertujuan untuk memetakan daerah terdampak dan menganalisis tingkat bahaya tsunami menggunakan sistem informasi geografis di wilayah pesisir Kabupaten Kebumen dengan tiga skenario ketinggian tsunami, yaitu 5,6 meter, 10 meter, dan 31,6 meter. Peta tingkat bahaya tsunami dibuat dengan metode Berryman dengan menggunakan beberapa dataset, yaitu garis pantai, kemiringan lereng, penggunaan lahan, koefisien kekasaran permukaan, dan ketinggian tsunami di garis pantai. Dalam penelitian ini, tingkat bahaya tsunami diklasifikasikan menjadi tiga kelas berdasarkan daerah yang tergenang, yaitu tinggi (>3 meter), sedang (1-3 meter), dan rendah (<1 meter). Hasil analisis spasial menunjukkan bahwa 8 kecamatan di Kabupaten Kebumen diprediksi akan tergenang dengan tiga skenario genangan yang berbeda. Skenario ini mencakup kedalaman genangan 5,6 meter, 10 meter, dan 31,6 meter, yang menghasilkan area yang berpotensi terkena dampak masing-masing seluas 1.938,2 hektare, 3.608,7 hektare, dan 9.587 hektare. Kecamatan Puring diidentifikasi memiliki potensi genangan terbesar., Kebumen Regency is one of the areas with a high potential for earthquakes and tsunamis because of its location right above the subduction zone of the Indo Australian plate with the Eurasian plate. This study aims to map the affected areas and analyze the tsunami hazard level using a geographic information system in the coastal area of Kebumen Regency with three tsunami height scenarios, namely 5,6 meters, 10 meters, and 31,6 meters. Tsunami hazard maps were derived from the Berryman method using several datasets, namely coastline, slope, land use, surface roughness coefficient, and tsunami height on the coastline. In this study, tsunami hazard levels were classified into three classes based on inundated areas, namely high (>3 meters), medium (1-3 meters), and low (<1 meter). Spatial analysis results revealed that 8 sub districts within Kebumen Regency were predicted to be inundated under three different inundation scenarios. These scenarios include inundation depths of 5.6 meters, 10 meters, and 31.6 meters, resulting in potentially affected areas of 1,938.2 hectares, 3,608.7 hectares, and 9,587 hectares, respectively. Puring District was identified as having the greatest potential inundation area
Keyword: metode berryman, tsunami, peta bahaya, SIG, skenario tsunami

Judul: Analysis of vulnerability level to tsunami on the Bengkulu City coastal using Geographic Information System
Abstrak: Kota Bengkulu adalah salah satu wilayah yang berpotensi tinggi mengalami bencana gempa bumi dan tsunami karena lokasinya yang berada tepat di atas zona subduksi lempeng Indo - Australia dengan lempeng Eurasia. Penelitian ini memiliki tujuan yaitu mengidentifikasi dan memetakan tingkat kerawanan tsunami di wilayah pesisir Kota Bengkulu. Peta kerawanan tsunami dibuat dengan metode tumpang susun (Overlay) menggunakan lima parameter, yaitu elevasi daratan, kemiringan lahan, jarak dari sungai, jarak dari garis pantai, dan penggunaan lahan. Penelitian yang mencakup 14 wilayah kecamatan ini terbagi menjadi dua tahap yaitu tahap pengolahan data dan tahap survei lapang yang dilakukan pada tanggal 14-15 Januari 2023. Tingkat kerawanan tsunami terbagi menjadi lima kelas yaitu sangat rendah dengan luas wilayah sebesar 230,821 ha (1,19%), rendah dengan luas wilayah sebesar 4.402,298 ha (22,75%), sedang dengan luas wilayah sebesar 8.135,778 ha (42,04%), tinggi dengan memiliki luas wilayah sebesar 5.361,059 ha (27,70%), dan sangat tinggi dengan luas wilayah sebesar 1.222,375 ha (6,32%). Kota Bengkulu didominasi oleh kelas kerawanan sedang sehingga secara umum tergolong tidak cukup aman dari risiko bencana tsunami., Bengkulu City is one of the areas that has a high potential for experience earthquake and tsunami disasters because of its location right above the subduction zone of the Indo-Australian plate with the Eurasian plate. This research aimed to identified and mapped the level of tsunami vulnerability in the coastal areas of Bengkulu City. The tsunami vulnerability map was created used the overlay method used five parameters, namely land elevation, land slope, distance from rivers, distance from the coastline, and land use. This research, which covers 14 sub-district areas, was divided into two stages, namely the data processing stage and the field survey stage which was carried out on January 14-15 2023. The level of tsunami vulnerability was divided into five classes, namely very low with an area of 230,821 ha (1.19% ), low with an area of 4,402,298 ha (22.75%), medium with an area of 8,135,778 ha (42.04%), high with an area of 5,361,059 ha (27.70%) , and very high with an area of 1,222,375 ha (6.32%). The city of Bengkulu is dominated by the medium vulnerability class so that in general it is classified as not safe enough from the risk of a tsunami disaster.
Keyword: Kota Bengkulu, kerawanan pesisir, SIG, tsunami, coastal vulnerability, Bengkulu City, GIS

Judul: Sintesis Flavonol melalui 2’-Hidroksikalkon
Abstrak: Flavonol is a class of flavonoids commonly found in fruits and vegetables. Flavonol is very useful, especially in food sector and health. In this study, flavonol unsubstituted was successfully synthesized from an intermediate material 2’-hydroxychalcone. The 2’-hydroxychalcone was synthesized by Claisen-Schmidt condensation method between o-hydroxyacetophenone and benzaldehyde using 4 different catalysts, namely KOH 60%, solid pellet of KOH-grinding technique, BF3-Et2O, and NaH in DMF. The KOH 60% was the best catalyst, giving the highest yield (57%). Afterward, the flavonol was synthesized in 1-stage oxidation cyclization of o-hydroxyacetophenone using Algar-Flynn-Oyamada (AFO) reaction, giving 76%. The flavonol total yield from 2’-hydroxychalcone was 43%. All synthesized products were characterized by their melting points and their spectra. The success of the synthesis flavonol opens the way to synthesis of useful flavonol derivatives such as quercetin and kaempferol.
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