STUDI KONFIGURASI DASAR SALURAN DI TIKUNGAN 90°

UKIMAN, UKIMAN (2005) STUDI KONFIGURASI DASAR SALURAN DI TIKUNGAN 90°. Masters thesis, program Pascasarjana Universitas Diponegoro.

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Abstract

The Research in river bed erosion of a bend in the channel is rarely being done. Usually the practitioners only strive to handle damage that happened around in the river bend as effect of high stream and speed of boisterous stream. And many result of done repair, not go along way because sliding to horizontal direction is safe but base erosion of channel isn't safe. To estimate erosion or sliding of steeply sloping riverbank on the bend in river or channel, so it was done by attempt or research about deepness level of erosion that happen on bend area. To know the existing occurrence was used by making river physical model for can be done by research in laboratory. This research model was done by examination with several of highly of stream level and time of streaming and also speed of stream. The result of research show highly of stream is h = 4,65 cm deepness of erosion is 4,43cm for the radius at Rc = 50 cm. While at the radius of Rc = 75 cm deepness of erosion is equal to 3,16 cm at stream level of h = 3,08 cm at the height of big stream, it was not damage for base channel, but sliding of steeply sloping riverbank of channel that horizontal direction was reach to 8 cm in exterior bend area. Sediment in the bend area was reach thick to1,02 cm, sediment in ',he final bend was happened to make a move of 20 cm to 80 cm up at downstream The solution of a bend of 90° for the radius of Rc = 50 cm Y lab. eq. = 0,430419 h — 0,096959 v + 0,733925 and Re = 75 cm. Y lab. eq = 0,213259 h — 0,10421 v + 1,567105. Penelitian hal gerusan dasar saluran di tikungan masih jarang dilakukan. Biasanya para praktisi di lapangan hanya melakukan upaya untuk menangani kerusakan yang terjadi di sekitar tikungan sungai akibat aliran air yang tinggi dan kecepatan aliran yang kencang. Dan banyak basil perbaikan yang dilakukan tadi, tidak berumur lama karena kelongsoran arah horizontal aman tetapi gerusan dasar saluran masih belum aman. Guna memprediksi gerusan atau kelongsoran tebing pada tikungan sungai atau saluran, maka dilaksanakan percobaan atau penelitian besamya kedalaman gerusan yang terjadi pada daerah tikungan. Untuk mengetahui kejadian yang ada digunakan cara dengan membuat model fisik sungai untuk dilaksanakan penelitian di laboratorium. Dalam model penelitian dilakukan pengujian dengan variasi tinggi aliran dan waktu pengaliran serta kecepatan aliran. Hasil penelitian menunjukkan tinggi aliran h = 4,65 cm kedalaman gerusan 4,43cm untuk jari-jari pada Re = 50 cm. Sedangkan pada jari-jari Rc = 75 cm kedalaman gerusan sebesar 3,16 cm pada tinggi aliran h = 3,08 cm pada ketinggian aliran air yang besar kerusakan dasar saluran tidak terjadi, tetapi kelongsoran tebing saluran arah horizontal mencapai 8 cm di daerah tikungan bagian 1 uar. Endapan di daerah dalam tikungan mencapai ketebalan 1,02 cm, endapan di akhir tikungan terjadi bergerak 20 cm hingga 80 cm ke arah hilir. Solusi gerusan pada tikungan 90° dengan jari-jari Re = 50 cm persamaannya : Y pers. lab = 0,430419 h — 0,096959 v + 0,733925 dan Rc = 75 cm persamaanya: Y pers. lab = 0,213259 h— 0,10421 v 1,567105.

Item Type:Thesis (Masters)
Subjects:T Technology > TA Engineering (General). Civil engineering (General)
Divisions:Postgraduate Program > Master Program in Civil Engineering
ID Code:12066
Deposited By:Mr UPT Perpus 2
Deposited On:27 May 2010 14:25
Last Modified:27 May 2010 14:25

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