PENENTUAN SUB DAS PRIORITAS PENANGANAN BANJIR DI DAS BODRI, JAWA TENGAH

Arina Miardini, Hengky Nugraha

Abstract


Penentuan sub Daerah Aliran Sungai (DAS) prioritas merupakan aspek penting perencanaan dan pembangunan sumberdaya alam terutama dalam konservasi sumberdaya air. Salah satu pendekatan yang digunakan dalam penentuan sub DAS prioritas adalah melalui analisis karakteristik morfometri DAS yang merupakan ukuran kuantitatif bentuk dan dimensi geomorfologi DAS yang dapat menunjukkan respon hidrologi pada masing-masing sub DAS. Tujuan penelitian adalah untuk penentuan sub DAS prioritas dalam penanganan banjir di DAS Bodri melalui pendekatan morfometri DAS. Metode yang digunakan adalah ekstraksi morfometri dari data vektor jaringan sungai dan topografi Rupa Bumi Indonesia (RBI) Skala 1:25.000. Parameter yang digunakan adalah analisis morfometri DAS yang terdiri dari Bifurcation Ratio (Rb), Drainage density (Dd), Stream Frequency (Fs), Texture Ratio (T), Basin Relief (Bh), Relief Ratio (Rh), Ruggedness Number (Rn), Form Factor (Rf), Length of Overland Flow (Lof), dan Constant Channel Maintenance (C). Parameter yang paling berpengaruh dalam penentuan prioritas penanganan banjir adalah Drainage density (Dd) karena mempengaruhi waktu konsentrasi dan puncak banjir. Berdasarkan hasil analisis diperoleh hasil bahwa Sub DAS yang diprioritaskan dalam penanganan banjir di DAS Bodri yaitu Sub DAS Bodri hilir dengan nilai skor total 2.00.

Keywords


morfometri DAS, sistem informasi geografi, sub DAS prioritas, banjir

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DOI: http://dx.doi.org/10.24895/MIG.2020.22-2.992

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