SPATIAL ANALYSIS OF SHORELINE CHANGES IN THE COASTAL OF SUBANG DISTRICT, WEST JAVA

ABSTRACT Observation of coastal shoreline changes in the Subang District was conducted using Digital Shoreline Analysis System Program based on the satelite images of Landsat TM from 1996 to 2010. The purpose of this study was to determine the distance of shoreline change. Methods used in this study were field survey and regression analysis of shoreline data. The results of this study indicated the existence of a region experiencing accretion and abrasion. The maximum width of accretion of the coast was 1,051.55 meter while the maximum abration was 1,206.83 meter. Coastal shoreline change in Subang District occurred mainly due to the development activities such as residential construction, altering the coastal mangrove to ponds and rice paddies, and sediment transport from the river around Subang District. Keywords: shoreline, Subang District, satelite images, accretion, abratio

PEMETAAN DAN PEMODELAN RIP CURRENT PADA KAWASAN WISATA PANTAI TELUK POPOH TULUNGAGUNG JAWA TIMUR

Wilayah pantai merupakan area yang biasa digunakan oleh para wisatawan untuk rekreasi. Namun, kasus kecelakaan pada wilayah pantai sendiri masih sangat tinggi yang mana salah satu faktor penyebabnya adalah rip current. Berdasarkan data dari Kantor Desa Besole, Kecamatan Besuki, Kabupaten Tulungagung, Jawa Timur bahwa terdapat 23 kasus korban terbawa arus dari tahun 2002 – 2012. Maka dari itu, diperlukan adanya observasi maupun prediksi terhadap kemunculan rip current pada Teluk Popoh. Penelitian ini bertujuan untuk menduga titik lokasi potensi kemunculan rip current; mengetahui karakteristik dan tipe rip current; dan mengetahui pengaruh parameter oseanografi terhadap potensi kemunculan rip current pada kawasan wisata Teluk Popoh. Data yang digunakan adalah data angin, gelombang, batimetri, pasang surut, kemiringan pantai, foto udara, dan citra satelit Digital Globe.  Penelitian dilakukan dari tanggal 19 Desember 2019 hingga 14 Februari 2020 yang terdiri dari survei lokasi; pengambilan data batimetri, pasang surut, dan foto udara di lapang; pengolahan data primer dan sekunder.  Identifikasi potensi kemunculan rip current dilakukan secara visual melalui citra satelit Digital Globe, foto udara dan pemodelan. Hasil penelitian menunjukkan bahwa terdapat beberapa lokasi indikasi kemunculan rip current jika diidentifikasi berdasarkan ciri – cirinya.  Selain itu, titik lokasi dan waktu kemunculan serta karakteristik dari rip current pada Teluk Popoh bervariasi tergantung pada faktor – faktor yang mempengaruhinya seperti perubahan musim, tinggi gelombang, kemiringan pantai, batimetri, keberadaan beach cusps, bentuk pantai, dan tipe pantai

SPATIAL ANALYSIS OF SHORELINE CHANGES IN THE COASTAL OF SUBANG DISTRICT, WEST JAVA

<p>ABSTRACT</p> <p>Observation of coastal shoreline changes in the Subang District was conducted using Digital Shoreline Analysis System Program based on the satelite images of Landsat TM from 1996 to 2010. The purpose of this study was to determine the distance of shoreline change. Methods used in this study were field survey and regression analysis of shoreline data. The results of this study indicated the existence of a region experiencing accretion and abrasion. The maximum width of accretion of the coast was 1,051.55 meter while the maximum abration was 1,206.83 meter. Coastal shoreline change in Subang District occurred mainly due to the development activities such as residential construction, altering the coastal mangrove to ponds and rice paddies, and sediment transport from the river around Subang District.</p> <p>Keywords: shoreline, Subang District, satelite images, accretion, abration</p

Kondisi arus pasang surut di perairan pesisir kota Makassar , Sulawesi Selatan

Numerical hydrodynamics model MOHID based on General Ocean Turbulence Model formula was used to study the tidal current in Makassar waters. The data used in this model are tidal elevation and bathymetry data from GEBCO. The tidal current simulation was conducted for 30 days. Model simulation results show that the tidal current velocity ranged between 0,001 m/s – 0,012 m/s. The current velocity during neap tide is smaller than the velocity during spring tide. The pattern of tidal current in Makassar waters is dominantly flows towards westward and then turned heading northward direction. The simulation result of tide-induced residual current in verification point shows that the flows is ebb-dominant at a rate of 0,005 m/s heading westward direction