Hydro-Meteorological Aspects of the 2021 South Kalimantan Flood: Topography, Tides, and Precipitation

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Munawir Bintang Pratama, Rafida Multazima Withono, Ismail Naufal Azkiarizqi


The 2021 South Kalimantan Flood is said to be the greatest flood ever take place in the province. This study aims to provide an overview of the disaster and assisting future research. Hydro-meteorological conditions such as topography, tides, and precipitation are described. Between January 10 – 19, extreme rain events occurred in South Kalimantan, a province dominated by low lying land with elevation < 7 m. The total precipitation during those 10 days reached 672.8 mm, resulting in a massive water accumulation at downstream. The peak was on January 14, the precipitation in Banjarbaru recorded a 250 mm/day, a 25-year return period value. Furthermore, the spring tide occurred at the same time, slowing the flushing in the tidal river, Barito River. Assessment of ERA5, TRMM, and GPM prediction data indicated that the latter is the most suitable to study the extreme rain events in South Kalimantan. Using the 20-year of GPM data, it is found that ENSO and IOD coexist with both the highest and lowest anomalies. With La Nina at the end of 2020, a positive precipitation anomaly in 2021 should be expected. This extreme precipitation is suspected as the main driver of the 2021 South Kalimantan Flood, and the impact gets amplified by the spring tides. Nevertheless, the significance of other factors, such as the land-use change is crucial to be studied.




Earth Sciences, Hydrology, Meteorology


Indonesia, Natural DisasterHydrological Hazard, Meteorological Hazard, Indonesia, Extreme Events, Precipitation Anomaly., Natural Disaster, Meteorological Hazard, Precipitation Anomaly


Published: 2021-03-01 03:21


CC BY Attribution 4.0 International

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