Abstract
Indonesia is the world's third-largest shrimp farming country. Shrimp are exported overseas as a high value-added seafood product of the aquaculture industry, bringing notable economic benefits. Shrimp aquaculture production in Indonesia is concentrated mainly in four provinces: Lampung, South Sulawesi, East Java, and West Java. In this study, sea surface height (SSH) and significant wave height (SWH) data in coastal Banyuwangi Regency, East Java, determined from Jason-2 altimetry satellite data, were analyzed to determine SSH and SWH variations from 2008 to 2019. In the study area, SSH increased by 5.74mm/year on average during these 12 years. Although the accuracy of this estimate depends on the accuracy of coastal altimetry measurements, this rate of increase is higher than the global average rate of ∼3.7mm/year (3.2–4.2mm/year) in 2018 outstripped the average annual increase over the past 3 decades. Notably, SSH decreased significantly in 2017, a La Niña year, and increased in 2019, an El Niño year. In contrast, the changes in SWH during the study period were relatively small. In addition, changes in the shoreline position in the study area from 2008 to 2019 were examined by using Landsat 7 and 8 data. The results showed shoreline recession ranging from 10 to 50m in these areas. Moreover, using a decadal model based on the Bruun rule, shoreline erosion of 50m or more was predicted in southern Banyuwangi Regency by 2050. These results indicate a strong tendency toward shoreline erosion in East Java. Considering the future rate of sea-level rise, continued shoreline erosion is expected to cause significant damage to the shrimp farming industry in the future in many areas. Therefore, measures against erosion and to mitigate climate change are needed, and effective adaptation strategies should also be developed and implemented.
Published Version
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