Judul: Analysis of Coastline Changes Using Sentinel 2A Imagery in the Coastal Area of West Pandeglang, Banten
Abstrak: Wilayah pesisir barat Kabupaten Pandeglang mengalami perubahan garis pantai yang disebabkan oleh faktor parameter hidro-oseanografi maupun aktifitas manusia. Pengamatan perubahan garis pantai dapat dilihat dengan nyata dan secara tidak langsung melalui penginderaan jauh. Tujuan penelitian untuk mengidentifikasi dan memetakan perubahan garis pantai di pesisir barat, Kabupaten Pandeglang, Banten. Ekstraksi garis pantai citra satelit Sentinel 2A menggunakan Tasseled Cap dan Perhitungan garis pantai menggunakan metode Digital Shoreline Analysis system (DSAS) serta pengambilan data lapang menggunakan GCP. Hasil analisis perubahan garis pantai cenderung lebih dominan mengalami abrasi dibandingkan dengan akresi. Abrasi terbesar terjadi di Desa Sidamukti sebesar 26.65 meter/tahun dan Akresi terbesar terjadi di Desa Sukajadi sebesar 24.92 m/tahun. Perbandingan kategori perubahan garis pantai dapat menggambarkan daerah yang rawan terkena gelombang besar sehingga dapat dijadikan sebagai pengalaman sekaligus pengetahuan untuk masyarakat Kabupaten Pandeglang. Kajian penelitian perubahan garis pantai penting dilakukan sebagai acuan dalam pembangunan wilayah pesisir dan pelabuhan, pariwisata, serta budidaya, Shoreline changes on the west coast of Pandeglang Regency are caused by hydro-oceanographic parameters and human activities. These changes can be observed through remote sensing. The research aims to identify and map these changes. The shoreline of a Sentinel 2A satellite image was extracted using the Tasseled Cap method. The shoreline was then calculated using the Digital Shoreline Analysis System (DSAS) method and field data collected using Ground Control Points (GCP). The analysis of shoreline changes indicates a dominance of abrasion over accretion. The most significant abrasion occurred in Sidamukti Village at a rate of 26.65 metres per year, while the largest accretion occurred in Sukajadi Village at a rate of 24.92 metres per year. The comparison of categories of shoreline change can indicate areas that are susceptible to large waves. This information can be used to provide both experience and knowledge to the people of Pandeglang Regency. The study of shoreline change is important as a reference for the development of coastal areas, harbours, tourism, and cultivation
Keyword: Abrasion, Accretion, DSAS, Sentinel 2A, Shoreline

Judul: Mapping of Coastline Changes in the Coastal of Bantul Regency Using Sentinel-2A Satellite Imagery
Abstrak: Pesisir merupakan wilayah yang kompleks akibat interaksi darat dan laut sehingga mudah mengalami perubahan secara fisik seperti perubahan garis pantai. Perubahan garis pantai penting diketahui untuk kajian pengelolaan kawasan pesisir, pemodelan pesisir, studi akresi-abrasi, serta analisis wilayah bahaya. Penelitian bertujuan memetakan dan menghitung laju perubahan garis pantai di Kabupaten Bantul, Daerah Istimewa Yogyakarta menggunakan citra Sentinel-2A pada tahun 2017, 2018 dan 2021. Metode digital shoreline analysis system (DSAS) digunakan untuk menghitung perubahan garis pantai secara statistik maupun geospasial. Lokasi penelitian terbagi menjadi 15 sub-zona dimana abrasi tertinggi terjadi pada Desa Parangtritis bagian timur (Sub-zona E3) dengan laju perubahan garis pantai mencapai -10,03 m/tahun. Abrasi dipengaruhi landainya kondisi pantai, gelombang dengan tinggi mencapai 2,39 m dan arus dengan kecepatan mencapai 0,24 m/s yang menggerus garis pantai serta tidak adanya penghalang di kawasan pantai. Akresi tertinggi terjadi di Desa Parangtritis bagian barat (Sub-zona E1) dengan laju perubahan garis pantai mencapai 9,20 m/tahun. Akresi dipengaruhi material sedimen dari darat yang mengendap dan menambah area garis pantai serta bergeraknya pasir oleh angin di sekitar gumuk pasir., Coastal is a complex area due to land and sea interactions so that it is easy to experience physical changes such as changes in coastlines. Coastline changes are important to know for coastal area management studies, coastal modeling, accretion-abrasion studies, and hazard area analysis. The study aimed to map and calculate the rate of change in coastlines in Bantul Regency, Yogyakarta Special Region using Sentinel-2A imagery on 2017, 2018 and 2021. The digital shoreline analysis system (DSAS) method used to calculate shoreline changes statistically and geospatially. The research location divided into 15 sub-zones where the highest abrasion occured in east Parangtritis Village (E3 sub-zone) with a coastline change rate of -10,03 m/year. Abrasion influenced by gentle coastal conditions, waves with a height of 2.39 m and currents with a speed of 0.24 m/s which erodes the coastline and there is no barrier in the coastal area. The highest accretion occurred in west Parangtritis Village (E1 sub-zone) with a coastline change 9,20 m/year. Accretion influenced by sedimentary material from land that settled and added to the coastline area and the movement of sand by the wind around the sand dune.
Keyword: abrasi, akresi, DSAS, Kabupaten Bantul, abrasion, accretion, Bantul Regency

Judul: Sintesis dan Pencirian Kompleks Fe(III)-Kuersetin
Abstrak: Quercetin belongs to flavonols which is able to chelate metal ions. Quercetin may chelate metal ions at 3’,4’-catechol, 3- or 5-hydroxycromone sites. In this study, quercetin was complexed with Fe(III). The complex with Fe(III) ions from FeCl3·6H2O was more stable than the complex derived from Fe(NO3)3·9H2O. The quercetin was yellow in color and showed maximum wavelengths (λ􀭫􀭟􀭶) at 250 and 370 nm. The Fe(III)-quercetin complex from Fe(NO3)3·9H2O was yellowish green with 􀟣􀭫􀭟􀭶 at 280 and 420 nm, whereas that from FeCl3·6H2O was dark green with 􀟣􀭫􀭟􀭶 at 280 and 430 nm. The 􀟣􀭫􀭟􀭶 shift indicated that the complex was formed at 3-hydroxychromone site. The Fe(III)- quercetin complex was formed with 1:1 metal-ligand mole ratio based on atomic absorption spectrophotometry analysis and the X-ray diffractogram showed that the crystallinity of the complex was 37%.
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