Studi pendahuluan klasifikasi ukuran butir sedimen di Danau Laut Tawar, Takengon, Kabupaten Aceh Tengah, Provinsi Aceh

Abstract. The purpose of this research was to examine the sediment grains size in Lake Laut Tawar. This research was done during Mei to June 2012. Five sampling stationse were determined  i.e. Toweran, Bintang, Klitu, Boom and Ujung Mumpar. Dry sieving analysis method was used in this study with different diameter stage sediment sieve  such as 4.75 mm, 1.7 mm, 250 µm,  850 µm, 150 µm, 0.2 µm, and 0.063 µm. The data was then weighed and calculated for percentages. The results showed that the sediment in Toweran station was dominated by pebble and medium sand; in Bintang station was dominated by pebble and coarse sand; in Klitu station was dominated by pebble and medium sand; in Boom station was dominated of colloid and remaining shells; and in Ujung Mumpar station was dominated of pebble and coarse sand. Generally, the sedimen type was pebble and coarse sand.Keywords: The dry sieving method; Stage sieve; Sediment grain size Abstrak. Penelitian ini bertujuan untuk mengetahui ukuran butir sedimen di Danau Laut Tawar. Penelitian berlangsung pada Bulan Mei sampai Juni 2012. Lokasi sampling terbagi menajdi beberapa stasiun;  Stasiun Toweran, Bintang, Klitu, Boom dan Ujung Mumpar. Sampel sedimen disaring dengan ayakan bertingkat dengan diameter  4,75 mm, 1,7 mm, 250 µm,  850 µm, 150 µm, 0,2 µm, 0,063 µm. Persentase berat fraksi sedimen dihitung berdasarkan saringan sedimen bertingkat. Hasil penelitian menunjukkan bahwa sedimen di Stasiun Toweran dominan kerakal dan batu yang diikuti pasir sedang, di Stasiun Bintang dominan kerakal dan batu yang diikuti pasir sangat kasar, di Stasiun Klitu dominan kerakal dan batu yang diikuti pasir sedang, di Stasiun Boom dominan koloid yang diikuti sisa kerang-kerangan dan di Stasiun Ujung Mumpar dominan kerakal dan batu yang diikuti pasir sangat kasar. Secara umum ukuran sedimen di Danau laut Tawar adalah kerakal dan pasir sangat kasar.Kata kunci : Metode ayak kering; Saringan bertingkat; Ukuran butir sedimen