Abstract
Flooding is one of the disasters that occur in almost all regions of Indonesia every year. The National Disaster Management Agency of Indonesia (BNPB) recorded 1,999 flood disasters since the beginning of 2018 until October 2018 causing 4,157 people dying and disappearing. Dengkeng River is a tributary of the Bengawan Solo River that experiences flooding problems when the rainy season arrives. Previous studies have produced one-dimensional river (1D) which does not provide detailed information of flooding modelling and analyzed sedimentation rates from secondary data. However, there is rare research and detailed observation on this subject in this area. Therefore, flood simulation models are required to identify flood-prone areas. In this study, a two-dimensional (2D) river model using the International River Interface Cooperative (iRIC) Nays2DFlood software from Japan has been used to observe flood-prone areas around the Dengkeng River and field observation was done in prone areas. The results showed that the Cawas sub-district tends to have the highest flooding potential due to the overflow of the Dengkeng River. On the other hand, the result of field observation showed sediments that settled in Tukuman Weir are dominated by coarse sand and gravel that tend to be influenced by the upstream in Merapi Volcano. Moreover, flood damage continues to occur as the consequences of riverbank erosion and high sedimentation at specific locations on the Dengkeng River.
Highlights
Flood disaster often occurring in Indonesia causes material and non-material losses
This research presented the situation of the affected area by using numerical simulation and field observation
Field observation showed sediments settled in Tukuman Weir are dominated by coarse sand and gravel
Summary
Flood disaster often occurring in Indonesia causes material and non-material losses. Dengkeng River is a tributary of the Bengawan Solo River that experiences flooding every year. Based on the previous study, climate change has occurred in the Dengkeng River as seen by the increase in temperature and rainfall which directly affect land use patterns, water availability, flood control performance, local social and economic development [5]. Human progresses such as urbanization and structural defences (e.g., levees, dams, sea walls) have a significant influence on the movement and severity of flooding, ameliorating impacts in some cases, but amplifying them in others [6]. This model is able to simulate two-dimensional horizontal (2D) flow, sediment transport, morphological changes from bottom depth, and erosion in rivers
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