Electronic Theses and Dissertation

Telah dilakukan penelitian analisis endapan sedimen tsunami purba di Gampong Gle Jong, Mukim Kuala Daya, Kecamatan Jaya, Kabupaten Aceh Jaya. Penelitian ini bertujuan untuk mengetahui lapisan sedimen tsunami yang terendapkan dan menganalisis sedimen tsunami tersebut. Daerah penelitian terletak di persawahan penduduk pada koordinat 〖05〗^° 〖04〗^' 34.5^"N dan 〖95〗^° 〖19〗^' 20.9^"E. Pengambilan sampel sedimen dilakukan dengan metode coring menggunakan alat hand auger, yang dilakukan pada 2 lintasan. Pada lintasan 1 terdapat 7 titik pengambilan sampel sedimen dan lintasan 2 terdapat 6 titik pengambilan sampel sedimen dengan jarak setiap titik yang berbeda-beda. Sampel yang didapatkan kemudian diamati secara visual berupa ukuran butir sedimen, warna, dan organik-organik yang terdapat di dalamnya. Selanjutnya sampel yang diduga sebagai sedimen tsunami ditempatkan ke dalam pipa paralon yang telah dibelah dua dengan diameter 3 cm, kemudian sampel dibawa ke Laboratorium untuk dilakukan pengamatan lebih lanjut. Dari hasil pengolahan dan pengamatan sampel tersebut jenis sedimen yang diperoleh berupa sedimen lempung, lanau, pasir, dan diduga sedimen tsunami yang terjadi di masa lampau. Ciri-ciri dari sedimen tsunami yaitu adanya lapisan pasir yang berada di antara dua lapisan tanah humus yang mengandung organik. Sedimen yang diduga sedimen tsunami hanya diperoleh pada lintasan 1 di titik 6 berada pada kedalaman 369-400 cm dengan ketebalan 30 cm dan pada lintasan 2 di titik 6 berada pada kedalaman 417-426 cm dengan ketebalan 10 cm. Data sedimen dianalisis berdasarkan klasifikasi Troels-Smith dengan ukuran butir sedimen yang dipilah menggunakan ayakan mesh untuk membedakan setiap jenis sedimennya. Setelah dianalisis ternyata persentase sedimen pasir lebih banyak didapatkan dari pada sedimen lempung dan sedimen lanau, dikarenakan ukuran sedimen pasir lebih besar dan massanya lebih besar dibanding dengan sedimen lempung dan sedimen lanau.

Research has been carried out to analyze ancient tsunami sediment deposits in Gle Jong Village, Mukim Kuala Daya, Jaya District, Aceh Jaya Regency. This study aims to determine the layers of tsunami sediment deposited and analyze the tsunami sediment. The research area was located in populated rice fields at coordinates 〖05〗^° 〖04〗^' 34.5^"N dan 〖95〗^° 〖19〗^' 20.9^"E. Sediment sampling was carried out using the coring method using a hand auger, which was carried out in 2 tracks. On track 1 there were 7 sediment sampling points and on track 2 there were 6 sediment sampling points with different distances from each point. The samples obtained were then observed visually in the form of sediment grain size, color, and the organics contained in it. Furthermore, the sample which was suspected to be tsunami sediment was placed into a paralon pipe that has been cut in half with a diameter of 3 cm, then the sample was taken to the laboratory for further observations. From the results of processing and observing the sample, the types of sediment obtained were clay, silt, sand, and suspected tsunami sediments that occurred in the past. The characteristics of tsunami sediments were the presence of a layer of sand between two layers of humus soil containing organic matter. The sediment that was suspected to be tsunami sediment was only obtained on track 1 at point 6 at a depth of 369-400 cm with a thickness of 30 cm and on track 2 at point 6 at a depth of 417-426 cm with a thickness of 10 cm. Sediment data were analyzed based on the Troels-Smith classification with the grain size of the sediments sorted using a mesh sieve to distinguish each type of sediment. After being analyzed, it turns out that the percentage of sand sediment is more than that of clay sediment and silt sediment because the size of sand sediment is larger and its mass is greater than that of clay sediment and silt sediment.