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Open Access MODEL SISTIM INFORMASI GEOGRAFIS UNTUK ESTIMASI VOLUME ALIRAN DAN EROSI SEDIMEN DI DAS RIAM KANAN PROVINSI KALIMANTAN SELATAN (GEOGRAPHIC INFORMATION SYSTEM MODEL TO ESTIMATE FOR DEBIT OF RIAM KANAN WATERSHED IN KALIMANTAN SELATAN)

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Dalam penentuan estimasi volume aliran, diperlukan model yang tepat yang dapat memperkirakan nilai volume aliran suatu DAS.  Telah terjadi penurunan daya dukung Sub DAS Riam Kanan sebagai daerah tangkapan air yang disebabkan oleh kritisnya tutupan lahan.  Penelitian ini bertujuan untuk estimasi volume aliran dan distribusinya di DAS Riam Kanan dan Sekitarnya berdasarkan data Citra Satelit Landsat7 ETM+. Hasil penelitian menghasilkan persamaan regresi Qp = 0,007p + 56,85 dengan tingkat regresi sebesar 89,6 %, menunjukkan bahwa tutupan lahan dapat berakibat langsung terhadap perubahan volume aliran di sub DAS Riam Kanan dan sekitarnya.   Dengan menggunakan data volume aliran yang tercatat pada papan duga muka air waduk (DMA) dan data hujan penyebabnya, diperoleh data volume aliran terendah di Daerah Rantau Balai yaitu sebesar 2,14 m3/det dan tertinggi di daerah Rantau Bujur sebesar 17,65 m3/det.  Sedangkan untuk daerah-daerah Bunglai, Tiwingan, Kalaan dan Belangian mempunyai volume aliran sedang berkisar antara 2,16 m3/det – 6,59 m3/det. In determining the estimated volume flow, required an appropriate model to estimate the value of the volume flow of a watershed. It has been a decline in the carrying capacity of the Sub Watershed of Riam Kanan as the catchment area due to critical land cover. This study aims to estimate the flow of volume and its distribution in the Riam Kanan Watershed  based on data Landsat7 ETM + Satellite Imagery. The results yield a regression equation Qp = 0.007p + 56.85 regression rate of 89.6%, indicating that land cover can lead directly to changes in flow volume in the sub watershed of Riam Kanan By using the data flow volume recorded on board thought the water reservoir (DMA) and data rains cause, the lowest flow volume data obtained in the lowest in Rantau Balai amount of 2.14 m3/sec and the highest in  the  Rantau  Bujur amount of 17.65 m3/sec. As for the areas Bunglai, Tiwingan, Kalaan and Belangian have moderate flow volume ranged from 2.16 m3/sec - 6.59 m3/sec.
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Document Type: Research Article

Publication date: January 1, 2016

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