Penentuan Formulasi Empiris Yang Sesuai Untuk Mengestimasi Kurva Intensitas Durasi Frekuensi

Donny Harisuseno, Sri Wahyuni, Yosie Dwirani

Abstract


Intensitas hujan yang tinggi akan menyebabkan limpasan permukaan yang besar dan dapat berdampak negatif.  Kurva IDF mempermudah perhitungan debit banjir rencana. Tujuan penelitian ini adalah menentukan metode empiris intensitas hujan dan IDF yang cocok untuk lokasi penelitian. Metode yang digunakan adalah Talbot, Mononobe, Hasper Der Weduwen, dan Van Breen.  Hasil perhitungan menunjukkan bahwa Metode Talbot yang paling sesuai digunakan di lokasi penelitian.  Metode Talbot memiliki nilai Deviasi Rata-rata 1.49; Kesalahan Relatif (Kr) rata-rata sebesar 8.64% dan Koefisien Nash Sutcliffe (ENS) rata-rata sebesar 0.98.  Kemudian dilakukan validasi metode terpilih menggunakan kala ulang 2 tahun dan 5 tahun dengan membandingkan intensitas hujan metode empiris dan intensitas hujan pengamatan dengan hasil nilai Deviasi Rata-rata sebesar 2.22; nilai Kesalahan Relatif (Kr) rata-rata sebesar 15.11%, dan Koefisien Nash Sutcliffe (ENS) rata-rata sebesar 0.93.


Keywords


hasper der wedumen; intensitas hujan; kurva IDF; mononobe; talbot; van breen

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DOI: http://dx.doi.org/10.21776/ub.pengairan.2020.011.01.06

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