Tidal inundation mapping under enhanced land subsidence in Semarang,Central Java Indonesia |
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| Authors: | Muh Aris Marfai Lorenz King |
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| Institution: | (1) Institute of Geography, Justus-Liebig-University, 35390 Giessen, Germany;(2) Geography Faculty, Gadjah Mada University, Yogyakarta, 55281, Indonesia |
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| Abstract: | Tidal inundation by high tide under enhanced land subsidence is a damaging phenomenon and a major threat to the Semarang urban
area in Indonesia. It impacts on economic activities, as well as the cost of an emergency program and causes interruption
of pubic services, danger of infectious diseases and injury to human lives. This study examines a spatial analysis tool on
the GIS-raster system for the tidal inundation mapping based on the subsidence-benchmark data and modified detail digital
elevation model. Neighborhood operation and iteration model as a spatial analysis tool have been applied in order to calculate
the encroachment of the tidal inundation on the coastal area. The resulting map shows that the tidal flood spreads to the
lowland area and causes the inundation of coastal settlement, infrastructure, as well as productive agricultural land, i.e.,
the fish-pond area. The monitoring of the vulnerable area due to the tidal inundation under the scenario of extended land
subsidence plays an important role in long-term coastal zone management in Semarang. |
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| Keywords: | Land subsidence Tidal inundation Neighborhood operation and iteration Semarang Indonesia |
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