Spatial Modeling of Tidal Flood Due to the Fishpond to Tidal Waves in Bengkalis, Indonesia

Abstract

AbstractAlmost 99% of the reported disasters are hydrometeorological types [11]. tidal flooding is one of the potentials that has recently become a frightening specter in the coastal area of Bengkalis. tidal flooding is an annual disaster that occurs in the coastal region of the Bengkalis Regency. (BPBD Bengkalis, 2020). it often happens and it has a serious problem for people living around coastal and tidal flats. This condition aggravated In 2020, most of the coastal areas in Bengkalis Island by the conversion of mangrove land into Fishponds, which is a classic problem in the research area for support the economy of the Bengkalis community. Moreover, The Sea level rise reported by IPCC (2007) increases by 15–90 cm with a definite increase of 48 cm in 2100. The method in this research is the spatial analysis model of coastal flooding use scenario optimum high tidal and estimation impact of conversion mangrove to become fishpond. All parameter data from the geospatial information agency (BIG), as land cover, coastal line, digital elevation model, and tides is analyzed using Cost Distance analysis with a geographic information system (GIS) in Arcgis. The aim of this research is to model the coastal flooding and the impact of the fishpond on tidal floods. For the final decision, we use the extreme scenario using the highest tidal discharge, which is 3.4 m to result in the Spatial Modeling Of Tidal Flood In Bengkalis. The results of this spatial modeling succeeded in showing the coastal flooding area, with the highest to lowest inundation range This model is suitable for representing the worst scenario of high tides in the coastal area of Bengkalis.KeywordsTidal FloodEnvironmental damageSpatial modelingCost distance