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All Journal Majalah Geografi Indonesia Forum Geografi JURNAL TEKNIK HIDRAULIK JURNAL SUMBER DAYA AIR Asian Journal of Science Education

Soewarno Soewarno

Unknown Affiliation

Author-ID : 2572322

Biochemistry, Genetics & Molecular Biology Chemistry Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Engineering Mathematics Physics

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Articles

Penelitian Pendahuluan Angkutan Sedimen Melayang Sub-Das Citarik Hulu = (Suspended Sediment Transport in the Upper Citarik Sub-River Basin: A Preliminary Study Soewarno Soewarno
Majalah Geografi Indonesia Vol 1, No 2 (1988): Majalah Geografi Indonesia
Publisher : Fakultas Geografi, Universitas Gadjah Mada

Apart from its function as a soil cover, forest also plays a positive role in preserving water and sediment in a river basin. Rain water which is abundant in the rainy season is caught and stored underground, so that the erosion and flood hazard can be eliminated. In the dry season groundwater becomes reservation to minimize and even eliminate the risk of water shortage. This preliminary study is to monitor suspended sediment transport with respect to the forest area of upper Citarum River Basin at upper Citarih Sub - River Basin. On the basis of the preliminary study results, it can be said that for a river basin where percentage of the forest area is smaller (i) the suspended sediment concentration is higher and (ii) the total sediment per area unit is greater. These indications were found during the study period, from September 1987 to February 1988. The preliminary study was conducted in a sub-river basin where the soil type is a mixture of andosol and brown regosol, and the terrain is undulating, hilly to mountainous with slope more than 15 percent.

Penerapan Teknik Sabo Untuk Pengendalian Daya Rusak Air Di Dataran Tinggi Dieng Singgih Haryono; Arif Rahmat Mulyana; Soewarno Soewarno; Arif Subagyo
JURNAL TEKNIK HIDRAULIK Vol 3, No 2 (2012): JURNAL TEKNIK HIDRAULIK
Publisher : Pusat Litbang Sumber Daya Air, Kementerian Pekerjaan Umum dan Perumahan Rakyat

Kinerja Dam Sabo K. Lumajang Untuk Pengendalian Sedimentasi Waduk Mrica Soewarno Soewarno
JURNAL SUMBER DAYA AIR Vol 6, No 1 (2010)
Publisher : Bina Teknik Sumber Daya Air, Kementerian Pekerjaan Umum dan Perumahan Rakyat

Salah satu permasalahan pokok operasional Waduk Pembangkit Listrik Tenaga Air Mrica adalah ancaman pendangkalan waduk, akibat laju sedimentasi yang terlalu cepat yang menyebabkan umur layan waduk menjadi lebih singkat. Sumber sedimen DAS Waduk Mrica berasal dari DAS Serayu, Merawu dan Lumajang. Sebagai upaya pengurangan laju sedimentasi pada tahun 2007, telah dibuat dam sabo di Kali Lumajang Desa Linggasari. Sebuah penelitian yang dilaksanakan tahun 20072009, yang bertujuan memberikan solusi mengendalikan angkutan sedimen sungai yang masuk ke waduk, dilakukan dengan cara mengevaluasi kinerja dam sabo Kali Lumajang Desa Linggasari, yang mencakup fungsi, efektifitas serta stabilitas, dan manfaat. Penelitian dimulai pada pembangunan dam sabo tipe tertutup, pengumpulan data sekunder, pengukuran debit dan angkutan sedimen, pengukuran geometri sungai dan kapasitas dam sabo langsung di lapangan, uji laboratorium, dan dilanjutkan dengan analisa dan interpretasi data untuk mengambil kesimpulan. Dam sabo dibangun dengan tubuh bendung utama dibuat dari campuran batu kali dengan pasir dan batu kali dengan kapur dibungkus dengan selimut beton tanpa tulangan. Musim hujan 2007/2008, dam sabo K. Lumajang telah berfungsi menampung sedimen 1350 m3 dan 2008/2009 sebesar 1390 m3 melebihi kapasitas rencana 1009 m3. . Contoh inovasi bangunan dam sabo K. Lumajang ini dapat digunakan sebagai acuan pembangunan dam sabo untuk mengendalikan laju sedimentasi waduk di lokasi lain.

Hydrological Characteristics of Kaligarang Watershed Soewarno Soewarno; Srimulat Yuningsih
Forum Geografi Vol 14, No 1 (2000)
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v14i1.454

This paper is a result of research concerning hydrological characteristic in the Garang Catchment Area. At present tha catchment area is often facing the problem of flooding in the dense populated area with cause a lot of loos in Semarang City. This research is aimed at studying hydrological harateristic in the Garang Catchment Area. Hydrological data are obtain from direct measurement at the stream gauging stations in the Garang Catchment Area and collected from Balai Hidrologi Office at Pusat Litbang Teknologi Sumber Daya Air in Bandung and from Hydrological Unit of Central Java Province. From this research were known the rainfall depth, their distribution and their return period; runoff coefficient; streamflow volume; dependable flow; flood discharge characteristi; and minimum discharge. From the some occuring flood indicates of the runoff coefficient is about 0.70. The water volume wasted to the sea is about 195 million m3/year. Yearly average of the dependable flow at stream gaunging stations: Garang – Pajangan is about 2.28 m3/sec; Garang – Patemon is about 0.92 m3/sec and Kreo – Pancur is about 1.26 m3/sec. Yearly mean of annual flood discharge at Garang – Pajangan is about 435 m3/sec. The maximum capacity of river channel is about 485 m3/sec. The flood discharge characteristic are as follows: time of travel of flood is generally one km/hour approximately, rising time is about 3 hours and time of recession is about 6 – 11 hours. The floods, they are generally occur at the night. Flush flood of 1022 m3/sec occured on January 26, 1990 is estimated on 50 year return period, with 15 year return period of rainfall. The range of minimum discharge is about 0.43 – 3.15 m3/sec. The maximum discharge is about 47.2 – 1118 times of the minimum discharge. Design of the dam in Kreo River at Jatibarang and Kripik River at Mundingan, also increasing of the reforestation area in the upstream catchment are an alternative to reduce the Garang River peak flood.

Surface Water Hydrology Conditions in Alabio Polder for Irrigation Soewarno Soewarno
Forum Geografi Vol 12, No 1 (1998)
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v12i1.485

The Alabio polder irrigation which area of 6000 ha is situated at the Negara river basin in Kalimantan Selatan province, consist of agricultural land which major part is approximately used for paddy-fields (60%), swamp zone (30%), and other (10%). During rainy season are usually flooded, which water level of 0,50 – 1,50 m above the ground surface. The flooding is due to the slight slope of the Alabio, Panggang, and Negara river. During field investigatiton period from Desember 1989 to Pebruary 1990, inflow discharge measured in the Tabukan intake was 14,9 – 17,1 m3/det, which water elevation was 2,62 – 2,74 m MSL, in Mahar intake was 0,52 – 2,67 m3/det, which water elevation was 2,94 – 3,25 m MSL. The outflow discharge measured in the Kalumpang drainage main canal was 1,68 – 17,1 m3/det, and in the Luang drainage canal was 13,62 – 16,92 m3/det. The Alabio Polder outside slope was 0,00011 – 0,00025, the inside slope was 0,00002 – 0,00010. The difference of water level elevations for the various discharge in the Alabio canals network is due back water in the downstream Polder area. Sedimentation was accour in the intake and drainage canals. The chemical analyze show that surface water meet to the standard for irrigation. The hydrologycal optimation and water balance study should be necessary.

The Development of Physics Student Skills Test Using Basic Physics Measuring Instruments Oka Melawati; Ngadimin Ngadimin; Soewarno Soewarno
Asian Journal of Science Education Vol 1, No 1: October, 2019
Publisher : Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/ajse.v1i1.14744

Learning about laboratory equipment is often done. However, at the end of the learning that is often carried out tests is knowledge. While the skills possessed by students are rarely carried out tests, even though skills are part of the competencies that must be achieved. This can be caused by the unavailability of test kits that can be used to measure skills. Therefore in this study researchers conducted research on the development of physics student skills tests using basic physics measuring instruments in the Fkip Unsyiah Physics Education laboratory. This study aims to obtain a skill test device using a valid basic physics measurement tool for physics education study program students. The products produced are in the form of assessment instruments in the form of rubrics on a scale of 1-3. This study uses the development model Rowntree which consists of three stages, namely: 1) Planning; 2) Development; and 3) Evaluation. The results showed that the instrument validation obtained a percentage of 80% with a very feasible category. While the results of the average percentage of practical performance using calipers is 90.3%, micrometer 92.1%, voltmeter 81.5%, and ampermeter 81.6%. That is, the average percentage of student performance is categorized as very feasible.

Co-Authors Arif Rahmat Mulyana Arif Subagyo Ngadimin Ngadimin Oka Melawati Singgih Haryono Srimulat Yuningsih

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