MODELING ADAPTATION TO SALINITY INTRUSION IN SEGARA ANAKAN ESTUARY DUE TO SEA LEVEL RISE

Authors

  • Harman Ajiwibowo
  • Feril Hariati
  • Iwan K. Hadihardaja
  • Joko Nugroho

Keywords:

Numerical modeling, Salinity, Sea Level Rise, Segara Anakan Estuary

Abstract

This research of the Segara Anakan Estuary, Java Island, Indonesia, is carried out with the aim
of developing a salinity intrusion model and investigating the adaptation scheme to mitigate the impact of sea
level rise. The study includes topography, water level and current velocity field data acquisition to provide the
required information for modeling. The bathymetry data are obtained from secondary data. The model uses the
Surface-water Modeling System (SMS) developed by the US Army Corps of Engineers. The flow model within
the SMS (RMA2 module) results in current velocity distribution in the domain, which is validated by field data.
The validated flow model is developed into a water quality model (RMA4 module). It is found that the current
velocity and salinity trend is highly correlated with Citanduy River discharge, which at the lowest value, the
tide is able to propagate over 10 km into the Citanduy River. The simulation period is until 2050, in which the
results show a sea level rise of 23.2 cm (referred to 2018). The model also shows that the saline water moves
farther inland in 2050, impacting a salinity increase of ~0.5–2.5 ppt along the Citanduy River. In 2050, with
check dam protection, an area of ~16.16 km from the mouth of the Citanduy River is only able to yield 75%
productivity from October to December. The top elevation of the check dam becomes the determining point
for mitigation.

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Published

2019-01-30

How to Cite

Harman Ajiwibowo, Feril Hariati, Iwan K. Hadihardaja, & Joko Nugroho. (2019). MODELING ADAPTATION TO SALINITY INTRUSION IN SEGARA ANAKAN ESTUARY DUE TO SEA LEVEL RISE. GEOMATE Journal, 16(53), 9–17. Retrieved from https://geomatejournal.com/geomate/article/view/2190

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