STUDI KARAKTERISTIK HIDROLOGI SUB DAERAH ALIRAN SUNGAI (DAS) JIRAK MENGGUNAKAN TIME SERIES ANALYSIS (Hydrological Characteristics Study of Jirak Sub Watershed Using Time Series Analysis)

Bayu Argadyanto Prabawa

Abstract


Sub Daerah ALiran Sungai (DAS) Jirak adalah salah satu aliran sungai yang muncul kembali di Gunungkidul. Aliran sungai mengalir ke dalam. Gua Kalisuci, dan menjadi sungai bawah tanah. Sungai bawah tanah ini digunakan untuk kegiatan pariwisata yang dikenal sebagai Cave Tubing. Masalah utama dari kegiatan pariwisata ini adalah terjadinya banjir. Banjir ini berasal dari debit yang berasal dari Sungai Jirak sebagai hulu dari Gua Kalisuci. Penelitian ini bertujuan untuk mengetahui karakteristik hidrologis Sub DAS Jirak di lokasi Wisata Gua Kalisuci dengan harapan akan menambah pemahaman pengelola wisata Gua Kalisuci terkait pengaturan sistem peringatan dini dan sistem evakuasi ketika terjadi banjir. Karakteristik hidrologi ditentukan dari rating curve, jeda waktu (Tlag) dan perhitungan curah hujan efektif (Pe). Hasil penelitian ini menunjukkan bahwa jeda waktu antara kejadian hujan dan kejadian banjir awal di Sub DAS Jirak berkisar antara 2,5 hingga 3 jam. Respon debit puncak yang cepat mengindikasikan bahwa Sub DAS Jirak memiliki sistem drainase yang cepat merespon hujan di musim hujan. Persentase curah hujan efektif ditentukan dari 17 hidrograf banjir terpilih yang nilainya meningkat dari fase awal hingga akhir musim hujan. Karakteristik hidrologi Sub DAS Jirak ini dapat digunakan oleh tim manajemen pariwisata Gua Kalisuci sebagai peringatan dini dan untuk evakuasi ketika banjir terjadi.


Keywords


banjir; karakteristik hidrologi; jeda waktu; hujan efektif

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DOI: https://doi.org/10.20886/jppdas.2020.4.1.37-52

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