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All Journal Majalah Geografi Indonesia Jurnal Pertanian Agros Jurnal Offshore: Oil, Production Facilities, and Renewable Energy
Anastasia Neni Candra Purnamasari
Petroleum Engineering, Universitas Proklamasi 45 Yogyakarta
Agriculture, Biological Sciences & Forestry Earth & Planetary Sciences Energy Engineering Mechanical Engineering

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IMPORTANCE OF MANGROVE TO REDUCE THE TSUNAMI WAVE ENERGY Purnamasari, Anastasia Neni Candra
Agros Journal of Agriculture Science Vol 19, No 1 (2017): Edisi Januari
Publisher : Faculty of Agriculture, Janabadra University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (392.832 KB)

Abstract

Mangrove has a very important role to reduce the tsunami wave energy. It is shown that the coastal areas have no vegetation or in this case will have an impact Mangrove forests greater damage due to tsunami waves than the coastal areas of vegetation. The purpose of the Term Paper is proved the importance of Mangrove to reduce the tsunami wave energy by comparing the various methods that have been observed in some case studies on the impact of the tsunami that occurred in several Asian countries in 2004 and case studies on ocean waves on the Gulf coast of south Florida. Based on the research results that could dampen Mangrove Tsunami wave energy. Tsunami wave energy can be reduced by several factors, namely mangrove species, tree size, vast mangrove forest, nature tree structure, and the size limit Mangrove forest (as far as how much of the ocean to the surface).
Perhitungan Volume dan Karakterisasi Material Endapan Erupsi Gunungapi Kelud Tahun 2014, di Sungai Bladak Bagian Hulu Dengan Metode Geofisika Anastasia Neni Candra Purnamasari; Junun Sartohadi; Wahyudi Wahyudi
Majalah Geografi Indonesia Vol 29, No 2 (2015): Majalah Geografi Indonesia
Publisher : Fakultas Geografi, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2011.109 KB) | DOI: 10.22146/mgi.13111

Abstract

ABSTRAK Erupsi Gunungapi Kelud pada 13 Februari 2014 menghasilkan material endapan di hulu Sungai Bladak dalam jumlah yang sangat besar.Endapan hasil erupsi yang terdapat di hulu sungai berpotensi sebagai material lahar bagi wilayah di hilir.Upaya mitigasi untuk mengurangi bencana banjir lahar memerlukan informasi volume material endapan. Selain itu, informasi karakteristik fisik material endapan juga penting untuk pemanfaatannya bagi masyarakat. Penelitian untuk mengetahui volume material endapan dilakukan dengan menggunakan metode geofisika pada pengukuran ketebalan dari material endapan.Metode geofisika yang digunakan adalah metode mikroseismik dan metode seismik refraksi.Hasil yang didapatkan dari pengolahan data lapangan mikroseismik adalah nilai frekuensi natural (f0) dari setiap titik pengukuran mikroseismik. Hasil yang didapatkan dari pengolahan data lapangan seismik refraksi adalah kecepatan gelombang P dari material endapan, dimana kecepatan gelombang P akan diturunkan sehingga didapatkan kecepatan gelombang S. Kecepatan gelombang S akan digunakan untuk penghitungan ketebalan material endapan yang digabungkan dengan nilai frekuensi natural dengan rumus h=Vs/4f0. Berdasarkan ketebalan material endapan yang didapatkan dari hasil penghitungan setiap titik mikroseismik, kemudian dibuat kontur ketebalan material endapan dan dilakukan penghitungan volume material endapan. Karakterisasi material endapan dilakukan dengan cara menghitung persentase pumice dan nonpumice secara fisual menggunakan foto lapangan. Ketebalan endapan pumice di permukaan lahan dianalisis persebarannya menurut satuan-satuan lereng. Volume material endapan yang didapatkan dari hasil penelitian sebesar 27,6 juta m3. Hasil karakterisasi material diketahui bahwa pumice pada material endapan yang ada di hulu Sungai Bladak 91,82 % dan sisanya 7,18 % adalah nonpumice. Jumlah pumice yang sangat banyak tersebut merupakan sumberdaya alam yang bernilai ekonomi tinggi. Pumice dapat digunakansebagai bahan bangunan ringan, tembok kedap suara, dan juga dapat sebagai bahan penggosok kain jean/denim dan mungkin masih ada jenis pemanfaatan lainnya. Ketebalan endapan pumice tidak berkorelasi dengan satuan-satuan lereng permukaan lahan. ABSTRACT Kelud volcano had erupted on February, 13th2014, it produced a huge ammount of material at the upstream of Bladak River. That materials potentially to be material flood in downstream area. The mitigation efforts to minimize flood hazard require volume information of the materials at the upstream. Moreover, information of physical characteristics of the materials is valuable for people at the surrounding areas. Volume assessment and materials characteristics were carried out through field measurements. The volume assessment of materials was done by using geophysical methods to estimate sediment thickness. Kind of geophysical methods applied was microseismic method and seismic refraction. The results obtained from microseismic data processing was the value of natural frequency (f0) at each microseismic measurement point. The results obtained from seismic refraction data processing was the P wave velocity of sediment material, in which the P wave velocity will be derivatived to obtain the S wave velocity. The S wave velocity used for calculating the thickness of sediment combined with the value of natural frequency through the formula of h = Vs/4f0. The isopach line was produced through interpolation of sediment thickness measurement points. Later, the isopach lines were applied for volume assessment. Characterization of sediment material was done by calculating the percentage of pumice and non-pumice. The sediment material characterization data was processed manuallythrough field photoes analysis. The data processing result were then analyzed descriptively.Materials thickness of pumice in land surface was analyzed according to slope classes. The result of volume assessment of the sediment materials at the upper stream of Bladak River was 27.6 million m3. The sediment at the upper stream of Bladak River consisted of 91.8% of pumice material. The pumice materials might be valuable for local economical generator as those materials have serveral purposes, but should be investigated thoroughly through research. The community in the area surrounding of Bladak River may exploid the materials for building materials or lightweight concrete materials, abrasive cloth jean or denim, etc. There were no significant correlation between land surface slope with the thickness of materials in the upper river catchment of Bladak.
Metode Inversi AVO Simultan untuk Mengetahui Sebaran Hidrokarbon Formasi Baturaja, Lapangan "Wine”, Cekungan Sumatra Selatan Anastasia Neni Candra Purnamasari
Jurnal Offshore: Oil, Production Facilities and Renewable Energy Vol 1, No 1 (2017): Jurnal Offshore : Oil, Production Facilities and Renewable Energy
Publisher : Proklamasi 45 University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (800.76 KB) | DOI: 10.30588/jo.v1i1.239

Abstract

Data seismik 3D (CDP gather) pada daerah penelitian dilakukan proses inversi prestack yaitu inversi AVO simultan untuk mengetahui sebaran hidrokarbon. Data seismik 3D terbentang dengan jangkauan inline 1003-1302 dan xline 5002-5300. Metode inversi AVO simultan dilakukan dengan data masukan berupa angle stack yang diinversi secara bersama-sama (simultan) untuk menghasilkan impedansi-P, impedansi-S dan densitas. Dari hasil inversi impedansi-P dan inversi impedansi-S didapatkan nilai lambda-rho dan mu-rho sebagai hasil turunannya. Kisaran nilai hasil inversi impedansi-P, impedansi-S, densitas, lambda-rho dan mu-rho pada porous limestone formasi Baturaja yaitu nilai impedansi-P sekitar 11000-13500 m/s*g/cc, nilai impedansi-S sekitar 6500-7400 m/s*g/cc, nilai densitas sekitar 2,52-2,6 g/cc, nilai lambda-rho sekitar 36-70 Gpa*g/cc dan nilai mu-rho sekitar 41-59 Gpa*g/cc. Berdasarkan map slice hasil inversi impedansi-P, map slice hasil inversi impedansi-S, map slice hasil inversi densitas, map slice hasil inversi lambda-rho dan map slice hasil inversi mu-rho dapat diketahui area persebaran hidrokarbon pada formasi Baturaja. Persebaran hidrokarbon berada di sekitar sumur TT.3D seismic data (CDP gather) in the study area was carried out a prestack inversion process, namely simultaneous AVO inversion to determine the distribution of hydrocarbons. 3D seismic data stretches with inline range 1003-1302 and xline 5002-5300. Simultaneous AVO inversion method is done with input data in the form of angle stack which is inverted together (simultaneously) to produce P-impedance, S-impedance and density. From the results of P-impedance inversion and S-impedance inversion, the values of lambda-rho and mu-rho are derived as a result of their derivatives. The range of values of P-impedance inversion, S-impedance, density, lambda-rho and mu-rho in porous limestone formation i.e. the P-impedance value around 11000-13500 m/s*g/cc, the S-impedance value around 6500-7400 m/s*g/cc, the density value around 2.52-2.6 g/cc, the lambda-value rho around 36-70 Gpa*g/cc and your value around 41-59 Gpa*g/cc. Based on the P-impedance inversion map slice, S-impedance inversion map slice, density inversion map slice, lambda-rho inversion map slice and mu-rho inversion map slice can be known the area of hydrocarbon distribution in the Baturaja formation. Hydrocarbon spread is around the TT well.
PENGARUH AKTIVITAS MANUSIA TERHADAP PENGGUNAAN LAHAN DI LINGKUNGAN PESISIR Purnamasari, Anastasia Neni Candra
Agros Journal of Agriculture Science Vol 23, No 1 (2021): Edsi Januari
Publisher : Fakultas Pertanian, Universitas Janabadra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37159/jpa.v23i1.1344

Abstract

Aktivitas manusia pada lingkungan pesisir desa Kuwaru yaitu kegiatan manusia di tempat wisata. Konversi lahan pada daerah pesisir desa Kuwaru cukup banyak seiring dengan tekanan aktivitas manusia. Tujuan penelitian ini adalah (1) mengetahui aktivitas manusia pada lingkungan pesisir desa Kuwaru, (2) mengetahui konversi lahan pada daerah pesisir desa Kuwaru, (3) mengetahui dampak penggunaan lahan atau alih fungsi lahan pesisir desa Kuwaru. Metode penelitian menggunakan metode studi literatur, pengamatan langsung di lapangan dan indept interview. Hasil penelitian menunjukkan bahwa penggunaan lahan atau alih fungsi lahan pesisir desa Kuwaru menimbulkan dampak yang cukup besar, baik dampak positif dan dampak negatif.
Co-Authors Junun Sartohadi Wahyudi Wahyudi