KAJIAN RANCANG BANGUN ALAT UKUR DEBIT AMBANG LEBAR DENGAN VARIASI KEMIRINGAN HILIR

Authors

  • Risman Risman Politeknik Negeri Semarang
  • Warsiti Warsiti Politeknik Negeri Semarang
  • Wasino Wasino Politeknik Negeri Semarang
  • Mawardi Mawardi Politeknik Negeri Semarang
  • Tedjo Mulyono Politeknik Negeri Semarang

DOI:

https://doi.org/10.32497/wahanats.v27i1.3749

Keywords:

overflow, broad crested weirs, energy loss.

Abstract

The modeling of broad crested weirs is expected to facilitate understanding, especially the behavior of the flow flowing through the measuring instrument. The flow behavior under consideration is hydraulic behavior, measurement accuracy, and discharge curve. In addition, there is a relationship between discharge and water level upstream and downstream of the spillway, as well as the relationship of the variation of discharge flowing through the broad crested weirs to the loss of energy height. From the results of this study, it was found that there was a relationship between discharge and water level upstream, downstream, water level above the threshold, and energy loss for wide-threshold spillway. The modeling of the broad crested weirs assumes that the Froude number that occurs in the model is the same as the Froude number that occurs in the field. So that the scale of discharge, time, velocity and volume will be able to represent the actual conditions in the field. The scale of length, width, and height of the prototype is 1: 100. The methodology used is to carry out testing in the hydraulics laboratory by varying Q1, Q2, Q3, Q4, ”¦. Qn, to obtain variations in water level upstream and downstream of the broad crested weirs. From the results of the study, it was found that the energy loss was relatively small with a trend of Y = 101.66x2 - 0.7359x + 0.0017 with the slope of the broad crested weirs downstream is 1:2, Y = 467.84x2 - 1.7816x + 0.0022 for slope of the broad crested weirs downstream is 1:1.5, and Y = -1140,4x2 + 0.6383x + 0.0077 with the slope of the broad crested weirs downstream is 1:1 where Y is the energy loss in meters and X is the discharge in m3/sec.

Author Biographies

Risman Risman, Politeknik Negeri Semarang

Dosen Jurusan Teknik Sipil

Warsiti Warsiti, Politeknik Negeri Semarang

Dosen Jurusan Teknik Sipil

Wasino Wasino, Politeknik Negeri Semarang

Dosen Jurusan Teknik Sipil

Mawardi Mawardi, Politeknik Negeri Semarang

Dosen Jurusan Teknik Sipil

Tedjo Mulyono, Politeknik Negeri Semarang

Dosen Jurusan Teknik Sipil

References

Alboresha, R. dan Hatem, U., 2021, Effect of Height and Surface Roughness of a Broad Crested Weir on the Discharge Coefficient: Experimental Study, IOP Conf. Series: Materials Science and Engineering 1090-012087

Al-Hashimi, S. A. M., Madhloom, H. M., Khalaf, R. M., Nahi, T. N., dan Al-Ansari, N. A., 2017, Flow over Broad Crested Weirs: Comparison of 2D and 3D Models, Journal of Civil Engineering and Architechture 11, 769-779

Pusat Pendidikan dan Pelatihan Sumber Daya Air dan Konstruksi, 2016, Diklat Teknis Perencanaan Irigasi, Kementerian Pekerjaan Umum dan Perumahan Rakyat, Bandung

Saleh, S. S., Musa R., dan As”™ad H., 2019, Kajian Karakteristik Aliran Terhadap Bangunan Pelimpah Pada Saluran Terbuka. Jurnal Teknik Hidro. Vol. 12 Nomor 2

Suhardi, 2020, Rancang Bangun Prototipe Saluran Irigasi Skala Laboratorium, Jurnal Ilmiah Rekayasa Pertanian dan Biosistem. Vol. 8, Nomor 1

Yildiz A., Yarbasi G.E. Yarar A. dan Marti A., 2020, Modelling of board crested weirs by using dynamic similarity and CFD, Romanian Journal of Ecology & Environmental Chemistry. Vo. 2, No. 2.

Downloads

Published

2022-06-01