DOI: https://doi.org/10.14710/teknik.v45i2.65276

Sistem Dinamis dan HECRAS sebagai Alat Pengambil Keputusan Model Ketahanan Banjir

*Retno Tri Nalarsih scopus  -  Departement of Civil Engineering, Universitas Veteran Bangun Nusantara, Jl. S. Humardani No.1, Sekoharjo,57521, Indonesia
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Abstract
Banjir yang terjadi di Kijang Kota, Kecamatan Bintan Timur, Kabupaten Bintan dipengaruhi oleh kecepatan angin, kelembaban udara, temperatur, elevasi, dan tekanan udara yang mengakibatkan curah hujan tinggi, mempengaruhi infiltrasi, genangan, dan kinerja drainase. Penelitian ini menggunakan metode spasial HECRAS untuk mendapatkan area banjir dan genangan diikuti pendekatan Sistem Dinamik (SD). Hasil spasial yang diintegrasi model SD memberikan strategi yang terarah, secara real time. Hasil simulasi HECRAS sepanjang drainase Hilir hingga Hulu terjadi banjir, berkarakter genangan. Solusi drainase longstorage dan di Kampung Pisang dipasang pintu klep drainase sekunder ke primer dan kesepakatan konservasi SDA yang terintegrasi pemeliharaan drainase serta lahan semak belukar menambah DTA. Keuntungan unik dari model HECRAS dan SD adalah program konservasi bekerja maksimal saat mengintervensi infiltrasi sebesar 30%, artinya kinerja konservasi dalam penyelesaian masalah drainase harus dilakukan sebesar 30% dari keseluruhan kegiatan konservasi tersebut. SD mampu membuat simulasi dan solusi secara real time, dimana Submodel berikutnya nilai genangan turun sehingga beban drainase turun, dari kedua sub model tersebut terbukti bahwa nilai rawan banjir turun, dapat selesai pada tahun ke 4, dan tahun berikutnya harus membuat pengembangan solusi sesuai kebutuhan konservasi dan kinerja drainase.
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