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INDONESIA
KEAIRAN
Published by Universitas Diponegoro
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Core Subject : Science,
Earth & Planetary Sciences
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Articles 5 Documents
 1 
Search results for , issue "No. 2 - Tahun 12 Desember 2005" : 5 Documents clear
Pengaruh Kualitas Air terhadap Kualitas Tanah pada Tata Saluran Irigasi Pasang Surut di Kab. Barito Kuala, Kalimantan Selatan Tania Edna Bhakty
KEAIRAN No. 2 - Tahun 12 Desember 2005
Publisher : KEAIRAN

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Abstract

The food production in South Kalimantan Province is mostly gained from tidal irrigation along the downstream of Barito river. Tabunganen unit an area of 5600 ha, is one of the area under Tabunganen subdistrict. Previously the rice production in Tabunganen unit was considered sufficient, with the production rate of 2,5-3,0 ton/ha. Currently some areas near the tidal ponds have very low productivity, around 1-1,5 ton/ha. Some farmers presume that the decline in productivity is caused by soil acidity. This research is aimed to investigate the influence of water quality on soil quality in Tabunganen unit. Some measurements are taken in secondary and tertiary channels (upstream, middle, downstream), the value of Fe (mg/l), DHL (mmhos) and pH. The flow and water quality measurements are taken every 3 hours within 26 hours. Water level is measured for 15 days. The result of this research shows that pH values in both secondary and tertiary (upstream, middle, downstream) are pH>6. During rise and fall tide, the pH values of the right and left ponds are still same. This condition indicated the disfunction of the ponds retaining soil acidity, especially some areas near the tidal ponds. Therefore, the field has high potency for pirit oxidation. In tertiary channel, the DHL values is DHL>3290 mmhos, pH value is 6<pH<7 and Fe value is 0,01-1 mg/l.Keywords:Water quality, tidal irrigation, Barito river Permalink: http://ejournal.undip.ac.id/index.php/keairan/article/view/2716[How to cite: Bhakty, T.E. (2005). Pengaruh Kualitas Air terhadap Kualitas Tanah pada Tata Saluran Irigasi Pasang Surut di Kab. Barito Kuala, Kalimantan Selatan, Jurnal Keairan, 12 (2): 1-14]
Optimasi Desain Bangunan Pelengkap Bendungan dengan Metoda Simpson Luas Penampang (Simpson’s Rule) Carlina Soetjiono; Sunarto Sunarto
KEAIRAN No. 2 - Tahun 12 Desember 2005
Publisher : KEAIRAN

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Abstract

Design of headworks should be considered in the mitigation of hazards in Indonesia. Several aspects considered in design consist of design flood, influeczes to the structures, and the risk of earthquake. The external loads have a negative impact to the structures so the dimension of the structure should be bigger. In connection of the overdesign of structure, the cross section design should be optimum. The Simpson’s rule  is used to compute accurately the cross section area of the structure. This method is carried out by using the matematical of the existing condition and the reductions of the volume and the weight of the structures caused by the holes in the structures. Experimentally, the studies have been carried out in the Kalibumi weir and the tower of Cikukang dam. These studies present that the results of the stability analysis of the non orderly and non massive structures are quite satisfy. The out-come of the analysis is obtain the safety dams concerning with the program of safety dams in Indonesia.                            Keywords: optimum design, Simpson’s rule, head-works, dams, massive structurePermalink: http://ejournal.undip.ac.id/index.php/keairan/article/view/2733[How to cite: Soetjiono, C. dan Sunarto (2005). Optimasi Desain Bangunan Pelengkap Bendungan dengan Metoda Simpson Luas Penampang (Simpson’s Rule), Jurnal Keairan, 12 (2): 30-42]
Penggunaan Silt Screen untuk Proteksi Alur Pelayaran terhadap Siltasi Alfalah Alfalah
KEAIRAN No. 2 - Tahun 12 Desember 2005
Publisher : KEAIRAN

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Abstract

Indonesian beaches commonly took mud as basic material which are washed away by river flow from mainland during flood period. Navigational channels built in muddy beaches surely suffer from siltation resulted from wave and current transported fluid mud.Siltation in navigational channels mostly formed by fluid mud sedimentation and with a little contibution from accumulated suspended sediment. Common strives taken after are to build fix structure such as breakwater and submerge dike.The research will examine movable structure (silt screen) to decrease siltation rate in navigational channels.In the process, the research will use 2 dimentional mathematical model as well as physical one. The expected results would be optimal silt screen form and the value of siltation reduction rate in the navigational channels comparing with those without silt screen.Keywords: Silt screen, fluid mud sedimentationPermalink: http://ejournal.undip.ac.id/index.php/keairan/article/view/2736[How to cite: Alfalah (2005). Penggunaan Silt Screen untuk Proteksi Alur Pelayaran terhadap Siltasi, Jurnal Keairan, 12 (2): 43-53]
Mathematical Approach of Riverbed Propagation Endro P. Wahono
KEAIRAN No. 2 - Tahun 12 Desember 2005
Publisher : KEAIRAN

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Abstract

Berbagai macam pengambilan keputusan ideal yang berkaitan dengan rekayasa persungaian mensyaratkan sebuah studi menyeluruh pada perilaku sungai (respon sungai) baik akibat perubahan alam maupun akibat intervensi manusia. Dalam mempelajari respon sungai, terdapat banyak aspek yang harus diperhatikan, terutama yang berhubungan dengan morfologi sungai. Propagasi dasar sungai akibat perubahan lokal adalah salah satu aspek penting yang membutuhkan perhatian khusus karena dampaknya terhadap perubahan morfologi sungai. Sayangnya aspek ini belum dikaji dengan jelas karena fenomenanya yang kompleks. Tujuan utama tulisan ini adalah untuk mempelajari sekaligus mendapatkan fomulasi matematis bagaimana dasar sungai berperilaku akibat perubahan debit atau kekasaran bantaranya. Sebuah pendekatan matematis satu dimensi telah dirumuskan pada tulisan ini untuk menjelaskan secara sederhana proses konveksi - difusi yang terjadi pada propagaasi dasar sungai. Prinsip conveksi - difusi sebuah besaran dijadikan dasar pengembangan formula matematis dalam tulisan ini dengan mengadaptasikan batasan-batasanya dalam batasan-batasan morfologi sungai. Hasil dari penelitian ini menunjukkan bahwa pendekatan perilaku dasar sungai dengan metode matematis sederhana hanya dapat digunakan sebagai perkiraan umum. Hal tersebut dikarenakan kedua variabel: wave celerity (c3) dan diffusion factor (D) telah diasumsikan sebagai variabel yang linear. Sedangkan pada kenyataanya, kedua variabel tersebut berperilaku tidak linear. Dengan demikian pemahaman atas kemungkinan pemberlakuan formula yang dihasilkan serta batasan-batasan berlakunya formula tersebut menjadi hal yang sangat penting diperhatikan. Pendekatan numeris sangat direkomendasikan pada penelitian lanjutan untuk mempelajari lebih lanjut perilaku propagasi dasar sungai.  Kata kunci: morfologi sungai, dasar sungai, pendekatan matemtis, konveksi-difusiPermalink: http://ejournal.undip.ac.id/index.php/keairan/article/view/2744[How to cite: Wahono, E.P. (2005). Mathematical Approach of Riverbed Propagation, Jurnal Keairan, 12 (2): 54-63]
Pengelolaan Air Permukaan di Wonoharjo Kabupaten Karanganyar Supadi Supadi
KEAIRAN No. 2 - Tahun 12 Desember 2005
Publisher : KEAIRAN

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Abstract

The purpose of the research is to discuss and choose of the structures for managing of run-of water resources.This research is conducted by observing  the soil layers of 130x300 m2 wide and 4 m depth at 17th stations in Kabupaten Karang Anyar. Water table, hard soil, and gravel-soil is parameter for choosing the structure that is allowable. Hard-soil or water tabel on 2.0 - 2.5 meter at Colomadu, Kebakramat, Jaten, Tasik Madu,and Karang Anyar. Hard-soil or water tabel  on 2.5 – 3.0 meter at Matesih, Karang Pandan, Mojogedang, Jumapolo, and Ngargoyoso.Hard-soil on 3.0 – 4.0 at Kerjo, Jumantono, Jatipuro, and Jatiyoso. Big gravel-soil at Tawang Mangu, and Jenawi.The result showed that small dam or horizontal infiltration hole-water is allowable at Jenawi, Tawang Mangu, Karang Anyar, Jaten, Tasik Madu. Vertical infiltration hole-water is allowable at anothers. Keywords: small dam, infitration hole-water, hard soil, water table, big gravel-soilPermalink: http://ejournal.undip.ac.id/index.php/keairan/article/view/2746[How to cite: Supadi (2005). Pengelolaan Air Permukaan di Wonoharjo Kabupaten Karanganyar, Jurnal Keairan, 12 (2): 64-71]

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