Hujan rancangan berdasarkan analisis frekuensi regional dengan metode tl-moment
DOI:
https://doi.org/10.32679/jsda.v12i1.160Kata Kunci:
Hujan rancangan, analisis frekuensi, Generalized logistic, TL-momen, generalized extreme valueAbstrak
Hujan rancangan dengan menggunakan analisis frekuensi regional memberikan keuntungan pada sekelompok data yang memiliki jumlah data terbatas. Data terbatas yang digunakan dalam menghitung besarnya hujan rancangan memiliki tingkat kesalahan yang sangat besar untuk periode ulang yang tinggi.Oleh karena itu, maka digunakan analisis frekuensi regional berdasarkan pendekatan TL-momen. Jenis distribusi yang digunakan terdiri dari tiga yaitu Generalized Extreme Value (GEV), Generalized Pareto (GPA) dan Generalized Logistic (GLO). Dari ketiga jenis distribusi yang digunakan hanya Generalized Extreme Value (GEV) dan Generalized Logistic (GLO) yang mendekati nilai rata-rata regionalnya berdasarkan TL-Moment Ratio sementara berdasarkan hasil pengujian Z distribusi menunjukkan Generalized Extreme Value (GEV) memberikan hasil yang terbaik. Dengan cara ini, maka hujan rancangan yang dihitung berdasarkan analisis frekuensi regional terhadap data hujan maksimum tahunan dengan panjang minimal 10 tahun menggunakan Generalized Extreme Value (GEV) untuk DAS di daerah akarta dapat ditentukan.
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