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MITIGASI BENCANA TSUNAMI DI SDN TIRTOHARGO DUSUN BAROS, DESA TIRTOHARGO, KECAMATAN KRETEK, KABUPATEN BANTUL, PROVINSI DAERAH ISTIMEWA YOGYAKARTA Wiloso, Danis Agoes; Vienastra, Septian
JURNAL GAUNG INFORMATIKA Vol 11 No 1 (2018): Jurnal Gaung Informatika Vol 11 No 1 Januari 2018
Publisher : JURNAL GAUNG INFORMATIKA

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The Aceh tsunami disaster in 2004 made Indonesians aware of the dangers of the tsunami, especially in the coastal areas. Emergency preparedness and tsunamiunderstanding need to be socialized to the population from an early age. Understanding the occurrence of a tsunami disaster needs to be socialized to the community, if there is an earthquake and the epicenter is in the sea followed by sea water subsidence then the population must stay away from the beach.One of the efforts made is the socialization to elementary school students so that later can be transmitted to their offspring will be dangerous tsunami disaster andmitigation efforts so that will reduce the risk factor when the tsunami hit the area.In the socialization of community service at SDN Tirtohargo Dusun Baros, described how the tsunami, early warning system and mitigation efforts. One of themitigation efforts of the tsunami disaster is the mangrove planting around Baros Beach.

GEOMORFOLOGI DAN MORFOMETRI DAERAH ALIRAN (DAS) SUNGAI TINALAH DI KABUPATEN KULONPROGO DAERAH ISTIMEWA YOGYAKARTA Vienastra, Septian
Jurnal Teknologi Technoscientia Vol 11, No 1 (2018):
Publisher : IST AKPRIND YOGYAKARTA

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PEMETAAN ZONA KERENTANAN AIR TANAH DI PULAU BAKALAN, KABUPATEN BANGGAI KEPULAUAN, INDONESIA Febriarta, Erik; Cahyadi, Ahmad; Vienastra, Septian
MAJALAH ILMIAH GLOBE Vol 23, No 1 (2021)
Publisher : Badan Informasi Geospasial

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24895/MIG.2021.23-1.1256

Keterdapatan sumber daya airtanah di kepulauan sangat tergantung oleh faktor meteorologi (curah hujan) sebagai sumber air dan faktor geologi yaitu formasi penyusun batuan tempat cadangan airtanah tersimpan (akuifer). Pulau Bakalan berada di Kepulauan Banggai, yang secara kondisi geologi regional berada di Formasi Batugamping koral kuarter (Ql). Karakteristik airtanah di daerah batugamping sangat dinamis, terbatas, dipengaruhi oleh perkembangan dari aliran celah dan pelarutan. Sehingga dapat dikatagorikan daerah airtanah langka, dan bersifat setempat atau lokal. Keterbatasan airtanah juga dipengaruhi oleh aktifitas pengunaannya. Semakin besar penggunaan dan semakin intensif pemakaian airtanah, maka dapat mengakibatkan penurunan kuantitas dan penurunan kualitas airtanah. Penurunan kualitas airtanah dapat menimbulkan permasalahan kesehatan. Penurunan kualitas air dapat disebabkan tercemarnya sistem akuifer oleh sumber pencemar melalui pori-pori batuan pada formasi batugamping yang mudah terlarut. Untuk mengetahui distribusi kerentanan airtanah, maka tujuan dari penelitian ini adalah menentukan sebaran zona kerentanan airtanah pada batugamping terumbu. Untuk mencapai tujuan tersebut dilakukan analisis spasial multi-kriteria dengan pendekatan DRASTIC. Pendekatan DRASTIC dapat memberikan infromasi zona kerentanan berdasarkan sifat hidrogeologi pada batugamping. Analisis pemberian indekss pembobotan parameter dengan nilai tinggi, mengambarkan informasi faktor yang dominan atau yang paling mempengaruhi zona kerentanan airtanah. Hasil skor perhitungan setiap parameter diperoleh dari perkalian linier. Indekss kerentanan air tersebut dikelaskan ke dalam lima tingkat kerentanan dengan pendekatan equal interval. Hasil analisis menunjukkan kerentanan sangat rendah seluas 0,003%, kerentanan rendah seluas 18,79%, kerentanan sedang seluas 18,48%, kerentanan tinggi seluas 13,53% dan kerentanan sangat tinggi seluas 49,16% dari luas pulau 40,7 km2.Â

MITIGASI BENCANA TSUNAMI DI SDN TIRTOHARGO DUSUN BAROS, DESA TIRTOHARGO, KECAMATAN KRETEK, KABUPATEN BANTUL, PROVINSI DAERAH ISTIMEWA YOGYAKARTA Danis Agoes Wiloso; Septian Vienastra
JURNAL GAUNG INFORMATIKA Vol 11 No 1 (2018): Jurnal Gaung Informatika Vol 11 No 1 Januari 2018
Publisher : Universitas Sahid Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar

The Aceh tsunami disaster in 2004 made Indonesians aware of the dangers of the tsunami, especially in the coastal areas. Emergency preparedness and tsunamiunderstanding need to be socialized to the population from an early age. Understanding the occurrence of a tsunami disaster needs to be socialized to the community, if there is an earthquake and the epicenter is in the sea followed by sea water subsidence then the population must stay away from the beach.One of the efforts made is the socialization to elementary school students so that later can be transmitted to their offspring will be dangerous tsunami disaster andmitigation efforts so that will reduce the risk factor when the tsunami hit the area.In the socialization of community service at SDN Tirtohargo Dusun Baros, described how the tsunami, early warning system and mitigation efforts. One of themitigation efforts of the tsunami disaster is the mangrove planting around Baros Beach.

Pengukuran Dasar Telaga menggunakan Alat Perum Gema Untuk Menghasilkan Peta Batimetri di Telaga Winong Yogyakarta Erik Febriarta; Septian Vienastra; Agus Suyanto; Ajeng Larasati
Geo Media: Majalah Ilmiah dan Informasi Kegeografian Vol 18, No 1 (2020): Geo Media: Majalah Ilmiah dan Informasi Kegeografian
Publisher : Universitas Negeri Yogyakarta

Lake Winong is one lake that is not dried on dry season. This lake is located in the Village Kepek, District Saptosari, Gunung Kidul Regency, Special Region Province Yogyakarta. This study was designed to determine the depth or bottom topography of Lake Winong to produce bathymetry maps. Firstly, a survey was conducted to measure the depth with an echosounder instrument. Principally, an echosounder records the time interval required by the emitted sound wave to propagate to the bottom and return, from which the distance or depth (m) can be computed. Secondly, the depth data were interpolated by initially cross-validating the smallest Root Mean Squared Errors (RMSE) of the Inverse Distance Weighting (IDW), kriging, and natural neighbor methods. Each was run with the power values (weight factors) of 0.5, 1, 2, and 3. The results showed that kriging interpolation with a power value of 3 yielded the smallest RMSE, namely 0.005, and the lake observed was -0.2 to -1.8 m deep, with the deepest location found in the middle of the lake.

GEOMORFOLOGI DAN MORFOMETRI DAERAH ALIRAN SUNGAI (DAS) TINALAH DI KABUPATEN KULONPROGO DAERAH ISTIMEWA YOGYAKARTA Septian Vienastra
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 11 No 1 Agustus 2018
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Tinalah Watershed is part of the Progo Sub-watershed. The Tinalah River flows to southeast and its outlet on the Progo River. Tinalah Watershed has a resource that has not been utilized optimally, road network is good enough, there are farms and plantation. Parameters that measured and analyzed include geomorphological conditions and calculation of morphometric variables. Geomorphological conditions in this watersheds most of them are hills stretching from north to south with varying degrees of erosion. Landform in this watershed Tinalah form of the origin of fluvial, structural, and denudational process. Based on the calculation of watershed morphometric the following results are obtained: Area watershed (A) of 44.43 km2. The number of River Order (Nu) in each river order from 1 to 5 respectively is 136, 25, 8, 2, and 1. Bifurcation Ratio (Rb) at each order of the order ranging from 1 to 4 respectively is 5.44; 3,125; 4 and 2. Circulatioan Ratio (Rc) value is 0,558. Main river length (L) is 13.02 km, River Density (Dd) 2.77 km / km2, Length and Wide of Watershed 11.05 km and 5.44 km. The value of the river slope (Sb) is 6.8% and the Slope of Watershed (So) is 43%.

Dinamika hidrokimia air tanah pada Akuifer Pasiran Pulau Yeben Raja Ampat, Papua Barat Septian Vienastra; Erik Febriarta
Jurnal Pendidikan Geografi: Kajian, Teori, dan Praktek dalam Bidang Pendidikan dan Ilmu Geografi Vol 26, No 2 (2021)
Publisher : Universitas Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17977/um017v26i22021p099

The quality of coastal ground water on small islands has characteristics that are influenced by environmental and area factors. Yeben Island is a small island with an area of 0.57 km2 with priority coastal and marine tourism areas in the islands of Raja Ampat. This study aims to (1) analyze levels of ground water quality parameters and (2) analyze water samples against water quality standards. Groundwater samples taken as many as 4 samples from the study location. The location of water samples is in the morphology of the coastal plain. The analysis of each physical and chemical parameter of each groundwater sample is carried out by comparing the value of drinking water quality standards. The results are presented in a comparison table of quality standards and a graph of scaled values.Based on the results, the laboratory shows that it exceeds the quality standard of physical elements and chemical elements including fluoride, hardness, sulfate and organic substances. In general, the quality of water is poor. Poor ground water quality occurs due to the influence of sea water intrusion.Kualitas air tanah pesisir di pulau kecil memiliki karakteristik yang dipengaruhi oleh faktor lingkungan dan luasan. Pulau Yeben merupakan pulau kecil dengan luas 1,3 km2 dengan prioritas kawasan pariwisata pesisir dan bahari di kepulauan Raja Ampat. Penelitian ini bertujuan untuk (1) menganalisis kadar parameter kualitas air tanah dan (2) menganalisis sampel air terhadap baku mutu air. Sampel air tanah yang diambil sejumlah 4 sampel dari lokasi kajian. Lokasi sampel air berada pada morfologi dataran pantai. Analisis setiap parameter fisik dan kimia masing-masing sampel air tanah dilakukan dengan perbandingan nilai standar baku mutu air minum Hasil penelitian disajikan dalam tabel perbandingan baku mutu dan grafik nilai berskala. Berdasarkan hasil laboratorium menunjukkan melebihi baku mutu unsur fisik dan unsur kimia antara lain fluorida, kesadahan, sulfat dan zat organik. Secara umum kualitas air termasuk buruk. Kualitas air tanah yang buruk terjadi dikarenakan oleh pengaruh intrusi air laut.

Penentuan Zona Kerentanan Airtanah Metode Simple Vertical Vulnerability Di Pulau Yeben erik febriarta; Septian Vienastra
JURNAL SWARNABHUMI : Jurnal Geografi dan Pembelajaran Geografi Vol 5, No 2 (2020): Jurnal Swarnabhumi
Publisher : Geography Education Study Program, Faculty of Teacher Training and Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31851/swarnabhumi.v5i2.4431

Potensi airtanah di Kepulauan Raja Ampat sebagai tempat destinasi wisata sangat terbatas, hal tersebut disebabkan imbuhan airtanah yang terbatas dan tingginya pemanfaatan airtanah. Pemanfaatan airtanah secara berlebihan mengakibatkan penurunan kuantitas dan kualitas airtanah. Penurunan kualitas airtanah dapat menyebakan mengingkatnya kerentanan airtanah terhadap pencemaran. Kerentanan airtanah dapat diketahui secara intrinsik, dengan mempertimbangkan sifat fisik batuan. Tujuan dari penelitian ini adalah untuk mengetahui kelas kerentanan airtanah terhadap pencemaran pada akuifer dangkal dengan penilaian kerentanan secara intrinsik atau fisat fisik batuan (geologi). Untuk memperoleh hasil tersbut metode yang digunakan adalah penilaian kerentanan dengan metode Simple Vertical Vulnerability (SVV). Metode ini menggunakan parameter efektifitas batuan secara sederhana atau dapat digunakan pada kondisi pada daerah yang tidak banyak informasi kondisi hidrogeologi dan penerapan pada akuifer dangkal < 30m. Hasil penelitian menunjukkan bahwa zona kerawanan airtanah sangat tinggi (58,5%) didapatkan pada morfologi dataran pantai, kerentanan tinggi (23,9%) berada pada peralihan morfologi dataran pantai hingga ke perbukitan dan kerentanan sedang (17,5%) pada morfologi perbukitan. Zona aman untuk pemanfaatan airtanah terdapat pada zona kerentanan intrinsik tinggi dengan perlakuan pemompaan tidak lebih dari penurunan 0,8 m. Pemompaan berlebihan dapat mengakibatkan intrusi airlaut

GEOMORFOLOGI DAN MORFOMETRI DAERAH ALIRAN SUNGAI (DAS) TINALAH DI KABUPATEN KULONPROGO DAERAH ISTIMEWA YOGYAKARTA Septian Vienastra
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 11 No 1 Agustus 2018
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34151/technoscientia.v11i1.111

Tinalah Watershed is part of the Progo Sub-watershed. The Tinalah River flows to southeast and its outlet on the Progo River. Tinalah Watershed has a resource that has not been utilized optimally, road network is good enough, there are farms and plantation. Parameters that measured and analyzed include geomorphological conditions and calculation of morphometric variables. Geomorphological conditions in this watersheds most of them are hills stretching from north to south with varying degrees of erosion. Landform in this watershed Tinalah form of the origin of fluvial, structural, and denudational process. Based on the calculation of watershed morphometric the following results are obtained: Area watershed (A) of 44.43 km2. The number of River Order (Nu) in each river order from 1 to 5 respectively is 136, 25, 8, 2, and 1. Bifurcation Ratio (Rb) at each order of the order ranging from 1 to 4 respectively is 5.44; 3,125; 4 and 2. Circulatioan Ratio (Rc) value is 0,558. Main river length (L) is 13.02 km, River Density (Dd) 2.77 km / km2, Length and Wide of Watershed 11.05 km and 5.44 km. The value of the river slope (Sb) is 6.8% and the Slope of Watershed (So) is 43%.

Morfologi Dasar Laut Dote (Laut Halmahera) Kabupaten Halmahera Tengah Erik Febriarta; Septian Vienastra; Nurul Khakhim; Ajeng Larasati
LaGeografia Vol 20, No 3 (2022): Juni
Publisher : UNIVERSITAS NEGERI MAKASSAR

Dote Village is located in Central Halmahera Regency with hilly morphology in the north and the coast bordering the Dote Sea (Halmahera Sea) in the south. The main transportation access in Dote Village is sea transportation. The condition of the Dote Sea waters which is busy with local transportation activities between villages requires updating data as basic information on the condition of the seabed depth (bathymetry). Seabed depth data can be obtained from bathymetric measurements and tidal analysis as a correction for bathymetric measurements. The morphological conditions of the seabed can provide information on the topographic characteristics of the seabed. Based on these conditions, the purpose of this research is to map the depth of the seabed (bathymetry) in the Dote Sea of Halmahera. The method used is direct measurement with echosunder. Then corrected with secondary data in the form of tidal condition data. Analysis of the data used is the value of the sea depth measured by echosounder compared to the mean sea level (MSL) (calculation of tides). Then mapping the morphology of the seabed using the slope method. The data used is the value of the depth of the sea (bathymetry) which is converted into the value of the slope with the analysis of the slope of the horton slope. Based on the measurement results, it is known that the bathymetry shows that the regional morphological conditions of the seabed slopes of the Halmahera Sea Dote are sloping.AbstrakDesa Dote berada di Kabupeten Halmahera Tengah dengan morfologi perbukitan di bagian utara dan pesisir yang berbatasan dengan Laut Dote (Laut Halmahera) di bagian selatan. Akses transportasi utama di Desa Dote adalah transportasi laut. Kondisi perairan Laut Dote yang ramai dengan kegiatan transpotasi lokal antar desa memerlukan pembaharuan data sebagai informasi dasar kondisi kedalaman dasar laut (batimetri). Data kedalaman dasar laut dapat diperoleh dari pengukuran batimetri dan analisis pasang surut sebagai koreksi pengukuran batimetri. Kondisi morofologi dasar laut dapat memberikan informasi karakteristik topografi dasar laut. Berdasarkan kondisi tersebut maka tujuan dari penelitian ini adalah pemetaan kedalaman dasar laut (batimetri) di Perairan Dote Laut Halmahera. Metode yang digunakan adalah pengukuran langsung dengan alat perum gema (echosunder). Kemudian dikoreksi dengan data sekunder berupa data kondisi pasang surut. Analisis data yang digunakan adalah nilai kedalaman laut hasil pengkuran dengan echosounder dibandingkan dengan nilai tinggi muka laut rata-rata atau mean sea level (MSL) (perhitungan pasang surut). Kemudian pemetaan morfologi dasar laut menggunakan metode kemiringan lereng. Data yang digunakan adalah nilai kedalaman laut (batimetri) yang dikonversi menjadi nilai kemiringan lereng dengan analisis kemiringan lereng horton. Berdasarkan hasil pengukuran diketahui batimetri diketahui bahwa kondisi morfologi regional lereng dasar laut Dote Laut Halmahera termasuk miring.

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