Electronic Theses and Dissertation

ABSTRAK
Tulisan ini mengkaji kondisi sedimen pantai secara temporal di Perairan Ulee Lheue kota Banda Aceh. Penelitian ini bertujuan untuk memperoleh pola musiman dari ukuran butir sedimen di perairan Ulee Lheue. Pengumpulan data sedimen dilakukan pada bulan Maret, Juli 2021 dan Januari 2022 di sebanyak tujuh stasiun menggunakan metode coring. Analisis ukuran sedimen dilakukan di Laboratorium Akustik Fakultas Kelautan dan Perikanan, Universitas Syiah Kuala menggunakan metode ayak kering. Tipe sedimen ditentukan berdasarkan segitiga Folk, dengan parameter stastik sedimen seperti mean, sorting, skewness, dan kurtosis turut dianalisis. Principal component analysis (PCA) digunakan untuk mengintepretasi data. Terdapat dua jenis sedimen yaitu pasir (sand) dan pasir dengan sedikit berkerikil (slightly gravelly sand) dengan nilai ukuran butir rata-rata (Mean Grain Size) berkisar antara 1,16 φ (Medium Sand) – 2,416 φ (fine sand). Nilai deviasi (sorting) berkisar antara 0,47 φ – 1,05 φ yang di dominasi oleh terpilah sedang (moderately sorted) sementara kemencengan (skewness) berkisar antara -0,03 φ – 1,01 φ yang paling banyak berupa Nearly Symetrical. Nilai keruncingan (kurtosis) diperoleh berkisar antara 0,62 φ - 3,20 φ yang didominasi dengan kategori Mesokurtic dan Leptokurtic. Variasi musiman terbesar terjadi pada stasiun 2, yang memiliki tingkat similarity terendah.

Kata Kunci : Sedimen, Ukuran butir, Deviasi, Kemencengan, keruncingan,
Ulee Lheue, musiman

ABSTRACT This paper examined the temporal condition of coastal sediments in Ulee Lheue waters, Banda Aceh city. This study aimed to obtain the granulometry of sediments in Ulee Lheue waters during seasonal change. Sediment data collection was carried out in March, July 2021 and January 2022 at seven stations using the coring method. Sediment size analysis was carried out at the Acoustic Laboratory of the Faculty of Marine Affairs and Fisheries, Syiah Kuala University using the wet sieve method. The sediment type was determined based on the Folk triangle, with sediment statistical parameters such as mean, sorting, skewness, and kurtosis being analyzed. Principal component analysis (PCA) was used to interpret the data. There are two types of sediment, namely sand and slightly gravelly sand with Mean Grain Size values ranging from 1.16 (Medium Sand) – 2.416 (fine sand). The deviation value (sorting) ranges from 0.47 – 1.05 which is dominated by moderately sorted while the skewness ranges from -0.03 – 1.01 which is mostly Nearly Symmetrical. The curvature value (kurtosis) was obtained in the range of 0.62 - 3.20 which was dominated by the Mesokurtic and Leptokurtic categories. It was found that the variation of sediment grains was caused by the difference of seasons, where the greatest variation occurred at station 2, which had the lowest level of similarity. Keywords: Sediment, Mean Grain Size, Skewness, kurtosis, Ulee Lheue, seasonal