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All Journal Fondasi: Jurnal Teknik Sipil RACIC : Rab Construction Research Smart City
Dwinanti Rika Marthanty
Universitas Indonesia
Civil Engineering, Building, Construction & Architecture Transportation

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Risk And Mitigation Analysis of Tidal Flooding Disaster in Medan Belawan Sub-Distric, Medan City Ngakan Putu Purnaditya; Elfina Rozita; Dwinanti Rika Marthanty
Jurnal Fondasi Vol 10, No 2 (2021)
Publisher : JURUSAN TEKNIK SIPIL

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36055/fondasi.v10i2.12313

Abstract

Medan Belawan is one of sub-district in Medan City North Sumatera which is the coastal area. The area is particularly vulnerable to coastal hazard that of all people living near coastal line. The most influential of disaster is tidal flood. Tidal flood almost occurs every year with the total inundation area is 26,25 Km2, for example from 2010 until 2017 recorded that the tidal flood inundated around 0,5 m to 2 m in average. There were 98 113 people and 3000-4000 houses, schools, public health facility (puskesmas), highway, fishponds, and international harbor affected. The disaster is not only threatening the community life but also disturbance their sustainable livelihood especially people with low socio-economic condition. This paper provides risk index analysis of the flood and propose the disaster risk reduction measures to reduce the impact of risk. Regarding the analysis, Medan Belawan Sub-district was categorized into high-risk area to the tidal flood, so that its need disaster risk reduction measures. Disaster risk reduction aims to protect affected communities, reduce damage and losses when the disaster happens and make sure sustainable livelihood. Mitigation is one of disaster risk reduction effort that can be divided into structural and non-structural. In structural measure, one of solution is building the impervious seawall which is designed based on increasing of sea level rise due to some factors such as tidal, wave, wind, climate change, land subsidence, and flood which is caused by rainfall with the high intensity. Overall basic design of seawall can build in Medan Belawan Coastal Area is around 4,95 m for its height and will be in residential area that is directly bounded by the sea. In the other hand non-structural approach can be implemented if people permanently live in that area. They can do some adaptation activities to reduce negative impacts and if possible, for taking any advantages of its positive impacts. People can modify their settlements, public facilities and livelihood. Some area in Medan Belawan sub-district also have mangrove forest, there is around 747 hectares. Combination both of approaches aim to reduce the disaster risk.
Study of The Impact of The Incompatibility of Space Utilization In The Krukut River Mangasi, Kevin Daniel; Marthanty, Dwinanti Rika
Smart City Vol. 3, No. 1
Publisher : UI Scholars Hub

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The emergence of development on riverbanks has raised environmental problems in Indonesia, such as flooding, one of which is in the Krukut River Basin which crosses the province of DKI Jakarta. The land use change around the Krukut River causes narrowing and disrupts the absorption of rainwater and triggers sedimentation. This study aims to identify risks in the Krukut riverbank area based on the variable area of land use mismatch, population density, frequency and depth of flooding, volume of waste production, availability of waste management for water bodies and waste banks. The method used in this research is to load the score. Based on this research, the priority location is Cipedak Village, Jagakarsa District. It can be seen that at this location there is a narrowing and narrowing of the Krukut watershed. To anticipate this, normalization and construction of plaster can be carried around the banks of the Krukut watershed in the area.
ANALISIS DEFORMASI KOLOM TANAH GRANULAR MENGGUNAKAN METODE SMOOTHED PARTICLE HYDRODYNAMICS Aulina Reza Putri; Wiwik Rahayu; R. R. Dwinanti Rika Marthanty
Racic : Rab Construction Research Vol. 9 No. 2 (2024): DESEMBER
Publisher : LPPM Universitas Abdurrab

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36341/racic.v9i2.4857

Abstract

Large magnitude earthquakes often trigger liquefaction phenomenon in granular soil deposits. One of the major liquefaction events in Indonesia occurred during the 2018 Palu earthquake, which caused economic losses around 1.1 billion USD. Liquefaction can be mitigated by evaluating the risk and impact it will cause. The events can be modeled numerically by using the SPH method. SPH is a continuum method that doesn’t need to simulate numerical model. The advantage of using SPH is its ability to model large deformation phenomenon using Lagrangian approach. In this research, SPH was used to model the failure mechanism of 2D saturated granular soil column with 0.6 m x 2.0 m dimension. Soil constitutive model used is elasto-plastic, where plastic deformation is measured using Drucker-Prager failure criterion. The interaction between soil-water particles is represented by the seepage force, following the research model of Korzani et al. (2017). In this model, no external forces applied other than the gravity force. The simulation results are used to analyze granular soil deformation.
Co-Authors Aulina Reza Putri Elfina Rozita Mangasi, Kevin Daniel Ngakan Putu Purnaditya