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Ali Okto
Jurusan Teknik Geologi, FITK, Universitas Halu Oleo
Computer Science & IT Earth & Planetary Sciences Engineering

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Analisis Morfometri Sub-DAS Lahundape Sebagai Penyebab Proses Sedimentasi di Teluk Kendari Suryawan Asfar; Ali Okto; Andi Makkawaru; Isran Naim
Jurnal Rekayasa Geofisika Indonesia Vol 1, No 03 (2019): Edisi Desember JRGI (Jurnal Rekayasa Geofisika Indonesia)
Publisher : Jurnal Rekayasa Geofisika Indonesia

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Abstract

The Lahundape Sub-watershed is located in the area of Kendari City and Konawe District. Some of the problems that occur in the Kendari Bay region include siltation caused by sedimentary materials from all rivers that lead to Kendari Bay, one of which is the Lahundape River. One type of analysis that can be used to solve problems that arise is to do morphometric analysis. From the results of data processing and analysis found that the Lahundape Sub-watershed has a drainage density (Dd) of 11.6 km/km2, a very high stream frequency (Fs) value of 131.66, a drainage texture of 38.63, a factor of shape of 0.146 so that it can be grouped into elongated watersheds, roundness ratio values of 0.155 or Rc value <0.5, elongation ratio values of 0.216, surface flow lengths of 5.810 km, basin reliefs of 5.32 km or 5.324 meters, values of relief ratio of 0.77 and the roughness value of the Lahundape Sub-watershed is 61.82. So it can be concluded that the Lahundape Sub-watershed has a river flow that flows through rocks with soft resistance, so the transport of sediment transported will be greater than that the Lahundape Sub-watershed has sloping conditions that are quite sloping and high enough relief so it will tend to contribute on erosion and will later result in loss of sediment deposits in the sub-watershed area.
Analisis Aspek Linier Morfometrik Sub-DAS Lahundape Menggunakan Teknologi Sistem Informasi Geografis (SIG) pada Wilayah Kota Kendari Suryawan Asfar; Ali Okto; Andi Makkawaru; Mirnayanti Karim
Jurnal Rekayasa Geofisika Indonesia Vol 1, No 02 (2019): Edisi Agustus JRGI (Jurnal Rekayasa Geofisika Indonesia)
Publisher : Jurnal Rekayasa Geofisika Indonesia

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This research activity was carried out in the Lahundape Sub-watershed, using morphometric linear analysis where the analysis was carried out by extracting river networks using digital elevation data, namely Digital Elevation Model (DEM). From the results of data processing and analysis which found that the area of the Lahundape Sub-basin reaches 6.97 km2, the circumference of the Lahundape Sub-basin area reaches 23.74 km, the length of the Lahundape Sub-watershed reaches 6.91 km, the width of the Lahundape Sub-Basin reaches 1.01 km. The Lahundape Sub-watershed has a total of 5 river orders with a total number of rivers as much as 917, the length of the river flow The Lahundape Sub-watershed has increased in order 1 and decreased to order 5, with an average value of river length between 0.06 km up to 0.78 km and the total Lsm value reaches 1.73 km. The length of the river flow ratio of each order has increased were for the 2nd order/1st order (II/I) of 0.45 km, 3rd order/2nd order (III/II) of 0.46 km, 4th order/3rd order (IV/III) of 0.72 km, 5th order/4th order (V/IV) of 0.87 km. The Lahundape Sub-watershed river branching ratio has an average value of 3.42, where for the value of 1st order/2nd order of 4.72, 2nd order/3rd order of 4.31, 1st order 3/4th order of 2.92, and for 4thorder/5th order of 1.71.
Co-Authors Isran Naim Makkawaru, Andi Mirnayanti Karim Suryawan Asfar