PENGARUH ARAH SAYAP PELIMPAH SAMPING DAN KEDALAMAN ALIRAN TERHADAP KOEFISIEN DEBIT

Indratmo Soekarno




Abstract


Side weir is a type of protection structure which function is to protect channels from damage caused by excessive amount of water (overtopping) so the water level in channels or rivers is to be preserved. The type is spatially varied flow with decrease of discharge occurs in main channels along the side weir. Usually design of spillway applies entrance of slope 900. Thus this reduces discharge coefficient. In this research, the influence entrance slope less than 900 was observed such as 600 and 300. The observation showed that discharge coefficient is function of entrance slope and ratio value of water depth to weir radius (h/r) with largest discharge coefficient around value (0.341 â 0.366) with entrance slope value (55.850 â 57.730).

Abstract in Bahasa Indonesia :

Pelimpah Samping (side weir) adalah bangunan untuk melindungi saluran dari kerusakan yang diakibatkan oleh jumlah air yang berlebihan (overtopping). Dengan dipasang pelimpah samping maka ketinggian air di saluran atau sungai tetap terjaga. Tipe aliran adalah aliran berubah lambat laun terhadap ruang (spatially varied flow) dengan penurunan debit yang terjadi di saluran utama sepanjang pelimpah. Selama ini pembangunan pelimpah samping menggunakan sudut masuk 900 terhadap aliran utama. Dengan demikian mempunyai kerugian yakni berkurangnya koefisien pengaliran. Dilain pihak asumsi koefisien pengaliran tersebut sampai sekarang tetap dianggap cukup besar. Pada penelitian ini diamati pengaruh sudut masuk sayap yang lebih kecil dari 900 yaitu sudut 600 dan 300. Hasil penelitian menunjukkan bahwa koefisien debit merupakan fungsi dari sudut masuk dan nilai perbandingan kedalaman air dan jari-jari pelimpah (h/r). Koefisien debit terbesar bernilai antara (0,341 â 0,366) pada sudut masuk antara (55,850- 57,730).


Keywords


side weir, spatially varied flow, discharge coefficient, Froude number.

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Obituary: Professor Joseph Andy Soesilo
Founder of Jurnal Dimensi - predecessor of Civil Engineering Dimension journal

Djwantoro Hardjito & Benjamin Lumantarna | Civil Engineering Dimension 
May 25, 2015

ar Professor Joseph Andy Soesilo passed away on Friday, May 22, 2015 at the age of 71, in Tempe, Arizona, USA. Born in Blora, Central Java, Indonesia as Djwa Bian An, Andy came to Surabaya to pursue his tertiary education and received his bachelor’s degree in civil engineering from Petra Christian University in 1972. He was in the first batch of students in the civil engineering department in the university in 1962. He got his masters degree from the Asian Institute of Technology, Thailand, in 1976, and later on his Ph.D from the Department of Geography, Arizona State University, Tempe, USA in 1982.
During his studentship, Andy was actively involed in student movement. Among others, he pioneered the student magazine GENTA in 1964, especially to promote the university to wider community. GENTA is still exist right now, and considered as one of the oldest student magazines in Indonesia. Andy was the first president of the student council in the university, in the era which was characterized with political turmoil in the country.
He joined the Civil Engineering Department at Petra Christian University as lecturer in 1972, later becoming the Director of Student Affairs in the University from 1976-1977, and Director of Research and Community Outreach from 1977-1981.
While at Petra Christian University (PCU), he made major contributions to the establishment of Jurnal Dimensi in 1980, a journal to publish scientific articles, particularly resulted from research carried out by PCU lecturers and scholars. This journal is the predecessor of the current Civil Engineering Dimension Journal and several other journals published by PCU. The establishment of Jurnal Dimensi was visionary and exemplary, as at that time publication of scientific articles has yet to become obligation to Indonesian lecturers. Until his last day, Andy has served as a member of the International Advisory Board of CED journal.
In 1982, Andy moved to USA, to join the Arizona State University (ASU) as a Research Associate until 1988. For twenty years from 1988, Andy was affiliated with Arizona Department of Environmental Quality (ADEQ) as an environmental planner. Following his retirement from ADEQ, He was still lecturing as an adjunct professor at Urban Planning Department at ASU. Together with several friends, he founded Persekutuan Kasih Kristus Arizona (PKKA), Inc., a foundation to help Indonesian Christian schools in the rural areas.
Among his publications are ‘Site Remediation: Planning and Management’ (CRC Press, 1997) and ‘Hazardous Waste Planning’ (CRC Press, 1995). He supposed to present his paper entitled ‘The Role of Municipal WWTPs in Arizona’s Water Conservation’ in the coming ‘The Fifth Euro Asia Civil Engineering Forum’ (EACEF-5) conference, to be held at Petra Christian University, Surabaya, Indonesia, from 15-18 September 2015.
Andy, who had lived in Tempe, Arizona, USA, was the husband of Ursula (Lanny) Soesilo and the father of Irene and Stanley Soesilo.

 

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