Modeling Local Scour Characteristics on The Batujajar Bridge Pillar Using HEC-RAS Software

DOI

10.2991/aer.k.201221.049How to use a DOI?

Keywords

HEC-RAS, live-bed scour, pillar, Batujajar bridge

Abstract

The bridge collapse is often the result of scouring. The potential for flooding can increase riverbed degradation and local scouring, which adds to the bridge threat sub-structures. Batujajar Bridge, located in Batujajar District, West Bandung Regency, has two pillars within the Citarum river. The 150 m long bridge is at risk of collapse due to local scouring of the pillars. So it’s necessary to evaluate the depth of the scours with mathematical modeling using the HEC-RAS application in live-bed scour conditions. In general, scour modeling is obtained by modeling river geometry, bridge design, and river flow. Scour modeling used the CSU method and the Froechlich method in the HEC-RAS 5.0.7 application. Topographical conditions were obtained from the DEM of the study area using Global Mapper 2.0 software and river geometry modeling using RAS Mapper. Discharge data is used for steady flow modeling and hydrograph data for unsteady flow modeling from the Upper Citarum Watershed and Cimahi Sub Watershed. The bridge design used existing data. Index properties (grain size analysis, specific gravity test, and soil content weight test) were tested at the Bandung State Polytechnic Soil Testing Laboratory from soil samples around the existing Batujajar bridge’s pillars. The hydraulic simulation shows that the scour depth reaches 1.89 m, affecting the bridge stability. So, scour protection is required. The scouring depth of the live bed can be used as a parameter for handling bridges in the dry and rainy seasons.

Copyright

© 2020, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Nita Widia Khairinnisa Rustawa
AU  - Bambang Setio Budianto
AU  - Djuwadi
PY  - 2020
DA  - 2020/12/22
TI  - Modeling Local Scour Characteristics on The Batujajar Bridge Pillar Using HEC-RAS Software
BT  - Proceedings of the International Seminar of Science and Applied Technology (ISSAT 2020)
PB  - Atlantis Press
SP  - 290
EP  - 295
SN  - 2352-5401
UR  - https://doi.org/10.2991/aer.k.201221.049
DO  - 10.2991/aer.k.201221.049
ID  - Rustawa2020
ER  -