Analysis of Sedimentation towards the Changes of Mangrove Area Using Multitemporal Remote Sensing Technology (A Case Study in Gresik Regency, East Java, Indonesia)

Bangun Muljo Sukojo, - Nurwatik, Nova Nurul Annisa

Abstract


Mangrove grows in coastal areas with the soil is resulted from the accumulation of mud substrate from the sedimentation process. Gresik Regency is a downstream area where the Bengawan Solo River flows, and there is the Java Sea that carries a lot of sediment material to the coast. As a result, sedimentation is forming new land increasingly that can be a place for mangroves to live. Therefore, in this study, the calculation of suspended sediment concentration and mangrove area in Gresik Regency during 2016-2019 uses Sentinel-2A satellite imagery. The purpose of these calculations is to determine the effect of sedimentation as suspended sediment on changes in the mangrove area. Mangrove area is obtained from the Maximum Likelihood supervised classification. While suspended sediment concentrations estimated from remote sensing data are obtained using four prior algorithms, they do not meet the specified accuracy requirement. This research shows that there have been changes in the mangrove area to increase and decrease during 2016-2019. The largest addition of area occurred in the period 2016-2017, which is 479.347 Ha, and the most reduction in the area occurred in the period 2018-2019, which is 534.087 Ha. The statistical test result proves that the suspended sediment as sedimentation affects the mangrove by 64.9% in the significance level of 5% or 95% confidence level.

Keywords


Mangrove; sentinel-2A; suspended sediment.

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DOI: http://dx.doi.org/10.18517/ijaseit.12.1.12286

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