The utilisation of the numerical hydrodynamic model to face rob floods in coastal areas in the industrial revolution era 4.0 at east java Indonesia

Global warming which occurred has resulted in sea level rise resulting in Rob flooding in coastal areas. The research location is in Rob floods area in Tegalsari Hamlet, Jabon Subdistrict, Sidoarjo that have damaged seaweed cultivation, and estimated losses reached 5 billion rupiahs in early 2018. Therefore, it needs to do research numerical hydrodynamic models to prevent this flood. However, the devices for measurement data are too expensive. The purpose of this research is to utilise economical devices measurement based on the industrial revolution 4.0 with numerical hydrodynamic methods models in the field of civil engineering. This model is an approach to estimate the hydrodynamics of coastal waters such as tides, currents and water levels. To simulate the hydrodynamic model, for nearshore bathymetry data are gained from sonar and offshore bathymetry data from GEBCO. The simulations utilise open-source Delft3D software using the Navier-Stock formula. The outcomes prove that hydrodynamic simulation models can be used to estimate sea-level rise for the next few years in coastal areas. Thus, the determination of the type of construction of civil engineering buildings that are strong and environmentally friendly so that publics do not cause huge losses and make coastal communities resilient to disasters.