Abstract
Within last 10 years, high intensity of rainfall had triggered the increase of water level during floods along Sub-watershed of Muara Bangkahulu River, Bengkulu, Indonesia. The high rainfall intensity was caused by extreme weather change. This study was focused on a segment of Muara Bangkahulu Sub-watershed called Semarang Segment. This segment is one of socio-economy centres in Bengkulu City. This study was initiated by performing the environmental investigation and collecting the rainfall intensity data in the study area. The site investigation data and soil tests were also performed to obtain the soil properties along sloping ground of sub-watershed. The analysis to obtain the maximum flood discharge as well as the maximum water level within 10 years was conducted. Furthermore, the slope stability analysis using both finite element and limit equilibrium methods was performed. In general, the results of this study could be a recommendation to stakeholders to consider the future impact in the study area. The results of this study could also bring a recommendation for the slope protection in the study area.
Highlights
Bengkulu City (Figure 1) is a capital city of Bengkulu Province in Indonesia
This paper presents a study of slope stability along Semarang Segment of Muara Bangkahulu Subwatershed, especially due to the 10 years rainfall intensity period in Bengkulu City
As no adaptations implemented to reduce the impact of high rainfall intensity, the floods are still frequently occurring in Bengkulu City
Summary
Bengkulu City (Figure 1) is a capital city of Bengkulu Province in Indonesia This city is categorised as one of most vulnerable areas to natural disasters in Indonesia [1]. During 28-29 April 2019, a high rainfall intensity occurred massively in Bengkulu Province (Figure 2). It was triggering the flooding in Bengkulu City. As no adaptations implemented to reduce the impact of high rainfall intensity, the floods are still frequently occurring in Bengkulu City. At least two massive floods occurred in Muara Bangkahulu Watershed. The floods were generally started by high rainfall intensity in the upstream of Muara Bangkahulu River, which was located in Central Bengkulu Regency [7]. Putrie et al [10] mentioned that there is a significant increase on the population along Sub-watershed area in Bengkulu City
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