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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 15 Documents
 1   2 
DESIGN OF ROCK STRUCTURE BREAKWATER WITH LARGE OVERTOPPING ALLOWED/LOW CREST STRUCTURE (Case Study on Madras Port, India) Priyo Nugroho Parmantoro; Parang Sabdono
KEAIRAN No.1 - Tahun 10 JULI 2003
Publisher : KEAIRAN

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Abstract

Tugas utama dari proyek ini adalah untuk mendesain “kepala” dari breakwater (pe- mecah gelombang) sebelah utara bersama-sama dengan bagian “belalai” breakwater. Tujuan dari perencanaan ini adalah untuk mendapatkan breakwater yang dapat ber-tahan pada kondisi gelombang harian dan ekstrim (badai). Sedangkan tujuan lainnya adalah untuk menyediakan alur masuk pelayaran yang tenang ke kolam pelabuhan. Tetapi untuk kondisi tertentu, kapal-kapal tidak dapat berlabuh di pelabuhan karena kriteria dari akhir perencanaan adalah struktur yang dapat/menerima limpasan (over-topping) yang cukup besar. Kondisi ini didefinisikan sebagai maksimum gelombang transmisi adalah kurang dari 1 m dalam periode ulang kejadian 50 tahunan.
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]
KAJIAN POLA PERUBAHAN GARIS PANTAI DAN DSTRIBUSI SEDIMEN (STUDI KASUS PERAIRAN PANTAI KENDAL JAWA TENGAH AKIBAT PEMBANGUNAN PELABUHAN) Sriyana Sriyana
KEAIRAN Nomor 1, Tahun 12, JULI 2005
Publisher : KEAIRAN

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Abstract

As an impact of development of Kendal Port, the coast around the port will be disruption. The accretion and erotion will be happened in certain area in coast. Remind in the development of port should have environmental vision so it is felt important to has a study to know the impact in coastline changing. This study is to know how far the changing of Kendal coastline as effect of development Kendal port and pattern of sediment movement. Method was used to know how far the changing of coastline and movement pattern of sediment by using GENESIS SMS (Surface Water Modeling System) version 7.0. The result of running simulation program yielded that change of coastline will be equal to 15 m until 80 m of per year. The pattern of sediment movement in port basin is 0,25 – 0,30 gr/lt and in outer of port basin is 0,40 – 0,50 gr/lt. This trend followed the angle of incoming dominant wave and the current velocity.
EFISIENSI PENURUNAN KEKERUHAN, ZAT ORGANIK DAN AMONIAK DENGAN TEKNOLOGI BIOFILTRASI DAN ULTRAFILTRASI DALAM PENGOLAHAN AIR MINUM (STUDI KASUS: PENGOLAHAN AIR BAKU AIR MINUM PDAM PULO GADUNG) Nurandani Hardyanti; Sudarno utomo; Fikroh Amali
KEAIRAN No 1 TAHUN 13 JULI 2006
Publisher : KEAIRAN

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Abstract

Ammonia concentration in raw drinking water at Jakarta varied until 2,0 mg/l, that value has reached out the standard of ammonia (1,5mg/l) according to KepMenkes No 907/MENKES/SK/VII/2002. Ammonia in raw water could react with chlor to be choramine, which have lower disinfecting power. It could make chlor consumption being bigger, beside that presence of THMs and chlorophenol as by product of disinfecting is bigger. This research had done in PDAM Pulo Gadung  from December 2004/ January 2005. The purpose of this research was to know effectively of turbidity, organic matter and ammonia removal in raw drinking water by submerged biofilter using honeycomb tube plastic media and ultrafiltration with hollow fiber membrane processes. The feed water entered into the reactor continuously on aerobic and nonaerobic condition with the varied hydraulic residence time from 5-2 hour then continued with ultrafiltration process. Efficiency of ammonia decreased in nonaerobic condition in bioreactor average between from 41,45 - 70,30% and efficiency in ultrafiltration 34,48 - 38,71%. While in aerobic condition in bioreactor average between 44,04-75,00% and in ultrafiltration 35,00 - 38,89%.
SISTEM PERAMALAN BANJIR SECARA SPATIAL (STUDI KASUS PADA SUNGAI TUNTANG) Suharyanto Suharyanto; Sumbogo Pranoto; Hari Nugroho; Priyo Nugroho Parmantoro
KEAIRAN No.1 - Tahun 8 JULI 2001
Publisher : KEAIRAN

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Abstract

Flooding is a natural disaster which can not be prevented totally, Some countermeasures to alleviate the flooding’s damaging effects have been implemented with some deggree of succes and some with limited succes (fail). These countermeasures include normalizing the river courses, increasing its embankment, providing revetment, or providing with flood control structures. However, these countermeasures are not the only action to reduce flooding damage. An equally important action contributing to the success on reducing flood damaged is non-technical measures especially system information on flooding characteristics This non-technical measure requiring flood forcasting procedures (software, equipments, information exhange, procedures, and coordination). When the time, the places, and the magnitudes of the incoming floods can be predicted with better confidence then the affected regions and people can prepared to anticipate well before the flood occurrence. This will definitelyreduce the possible flood damages. This paper presents the development of flood forecasting function in the Tuntang River, i.e., from Glapan weir to Gubug, and Buyaran bridges. Additioanlly, the flood forecasting functions along the river, i.e., at every potentially vulnerable embankments are also presented. These functions have also been calibrated by the floods occuring on 2001.
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]
PENANGANAN ABRASI PANTAI PASIR MAYANG Salamun Salamun
KEAIRAN No 1 TAHUN 13 JULI 2006
Publisher : KEAIRAN

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Abstract

Seawall or Revetment have been devised to protect coastal or shoreline form  erosion by Waves. The seawall or revetment system must be resist direct wave attack, reduces hydraulic forces on underlying material and constribute to dissipation wave energy. Identifies the main types of seawall or revetment systems, decribes the main prediction methods used to design seawall or revetment armoring and for the first time offer a simple methode to compare design thickness of deferent system. On the field design of seawall or revetment be used at Tourism Area, so type of seawall  or revetment and structure be combined architeture. This Paper is case study Pasir Mayang
PENANGGULANGAN ABRASI DI PANTAI LAUT JAWA : TINJAUAN KASUS Slamet Hargono
KEAIRAN Vol 2, No 2 (1998): Desember 1998
Publisher : KEAIRAN

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Abstract

Kerusakan pantai yang diakibatkan oleh pukulan gelombang laut seringkali kita dengan dan atau ikuti di surat kabar/media cetak maupun dalam berita radio/televisi. Pada kesempatan ini yang disajikan adalah pada pantai utara pulau Jawa. Usaha untuk mengatasi kerusakan ataupun penanggulangannya sudah diupayakan, akan tetapi tidak selalu berhasil dengan baik. Ketidakberhasilan ini disebabkan beberapa faktor antara lain data/pemantauan gelombang yang kurang memadai, kurang data sekunder, batasan biaya yang tersedia dan masih banyak lagi. Pada penulisan ini disajikan data-data apa saja yang diperlukan untuk keperluan penanggulangan abrasi, analisa dari yang ada dan keluaran yang diharapkan dari hasil analisa. Dari beberapa kasus yang penulis amati, dapat disimpulkanbahwa dengan konstruksi kawat bronjong kurang dapat dipertanggung jawabkan, karena akan mengalami kegagalan dalam waktu yang relatif singkat. Kegagalan ini dikarenakan kawat bronjong sebagai pengikat batu kali mengalami korosi dan dalam waktu yang relatif singkat akan putus. Konstruksi yang penulis anggap cocok adalah dari kostruksi beton dengan tulangan praktis, pasangan batu kali, konstruksi dari buis beton yang didalamnya diisi dengan beton “cyclope” berfungsi sekaligus sebagai pengikat antara dua buis beton. Disaming itu faktor tanah juga punya peran yang cukup besar . artinya bahwa pemilihan konstruksi harus disesuaikan terhadap kondisi tanah yang ada.
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]
INSTRUSI AIR LAUT SUNGAI GANGSA Salamun Salamun
KEAIRAN Volume 14, Nomor 1, JULI 2008
Publisher : KEAIRAN

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Abstract

Estuary Phenomenon was construced by Tidal Range, Discharge and Sea Wave. Instrution was an impact of Fresh water and Sea Water or Salinity. Length of Instrution in Gangsa river can be forecasted by a model numerical which Saint Venant equation especially on continuity and momentum equation which was shown water surface and discharge. One of stop instrution on river is to build. Keywords :  Gangsa River, Estuary Phenomenon ABSTRAK Fenomena Estuary terbentuk dari Pasang, Debit dan Gelombang Laut. Instruary adalah dampakdari menysupnya air laut/salinitas kerah air tawar/sungai. Panjang instrusi Sungai Gangsa dapat diramalkam dengan Numerik dengan persamaan Saint Venant khususnya pada Continuitas dan momentum yang ditunjukkan oleh elevasi muka air dan debit. Peramalan ini adalah salah satu cara penentuan bangaunan penanggulangan instrusi air laut. Kata kunci : Debit Sungai, Pasang Surut dan Salinitas.

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