Analysis of Stability Safety Factors of Gabion Weir Models against the Wall and Water Level Variation

Abstract

The phenomenon of climate change that is happening in the world causes global warming, which has an impact on rising sea levels causing floods and tidal floods. Research on the Gabion weirs as an alternative to appropriate technology is the first step to address either the problem of tidal flooding mitigation or as a raw water filter. This prototype test research was carried out at the Hydraulics Laboratory of the Sultan Agung Islamic University, Semarang. It employed a quantitative method by conducting prototype testing to justify field conditions by handling close results. The research analysis technique began by collecting primary data and secondary data. The design of the Gabion weir models as a filter included three types of weir testing models, namely type 1 trapezoidal model, type 2 beam model, and type 3 combination model. The material, geometry and dimensions of the experimental prototype are a reduction of the real problem conditions in the field. The results of the observation analysis of the Gabion weirs have obtained the average elevation of the water, MAR = 10 cm, MAB 60 cm, MAN = 45 cm, the elevation of the MAB upstream of the weir =65 cm, the elevation of the center of the weir = 44.5 cm, the downstream weir MAB = 41 cm, the measured flow velocity upstream of the weir 0.75 l/s, center 0.75 l/s, downstream 0.6 l/s and upstream temperature 31°C, center 30.3°C, 30°C, clean downstream water conditions. The results of the study represent a function of the elevation of the flood water level both upstream and downstream which are through the Gabion Weirs with several thicknesses as raw water filters.