Work

Dynamics of Flooding in the Tabanio Watershed, South Kalimantan: An Examination of River Morphology, Tides and Hydrological Interaction

Year: 2026

Type: article

Abstract: Tidal flooding is an increasingly intense disaster in coastal areas due to the confluence of various environmental factors. This study aims to identify the primary causes of tidal flooding in the Tabanio River Basin, South Kalimantan, Indonesia. The analysis combined hydrological data (rainfall and discharge), oceanographic data (tidal patterns), and river morphology (topography, bathymetry, and sedimentation), which were then modeled using HEC-RAS. The simulation results show that tidal flooding events are triggered by a combination of extreme rainfall, increased flood discharge from upstream, sedimentation, and the influence of sea tides in downstream areas with low contours. The flood model shows inundation depths ranging from 0.25 to 3 meters with a wide distribution from upstream to the coast. The novelty of this study lies in its integrative approach, which simultaneously assesses three main components: hydrology, tides, and river morphology, utilizing a combination of HEC-RAS 2D, Sentinel satellite imagery, and the Coastal Vulnerability Index (CVI). This approach has never been applied before in South Kalimantan, particularly in the Tabanio watershed. It provides a new understanding that tidal flooding results from complex interactions among environmental components rather than a single factor.

Source: Environment and Ecology Research

DOI: 10.13189/eer.2026.140413