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All Journal Journal of Marine and Aquatic Sciences REKAYASA
Herlambang Aulia Rachman
Program Studi Ilmu Kelautan, Fakultas Kelautan dan Perikanan, Universitas Udayana
Agriculture, Biological Sciences & Forestry Computer Science & IT Earth & Planetary Sciences Electrical & Electronics Engineering Engineering Physics

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Variasi Data Suhu Permukaan Laut, Tinggi Paras Laut, Klorofil-a, dan Upwelling di Perairan Selatan Jawa serta Korelasinya Dengan Data Lapangan Herlambang Aulia Rachman; Jonson Lumban Gaol; Fadli Syamsudin
Journal of Marine and Aquatic Sciences Vol 5 No 2 (2019)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (565.849 KB) | DOI: 10.24843/jmas.2019.v05.i02.p17

Abstract

South Java Sea are regions that have quite complex dynamics because they are influenced by several factors, both regionally and globally. The influence certainly affects the variations in oceanographic features such as Sea Surface Temperature (SST), Sea Surface Height (SSH), and Chlorophyll-a concentration. Observation of oceanographic feature at this time has many methods, one of them by remote sensing. The purpose of this study is to calculate the variation of oceanographic conditions based on satellite data and its correlation with field data. The results show that the SPL and ATPL data with the field data have a fairly good relationship, where the value of R2 reaches 0.74 and 0.9. In general, the variation of oceanographic data has the same pattern that is changing seasonally. SST and SSH data are at their maximum in the January-March period, while the minimum is July-September. While the concentration of chlorophyll-a is at the maximum condition in July-September and minimum in January-March. This is thought to be an upwelling phenomenon that occurred in July-September due to the monsoon wind movement. Upwelling index calculation results based on wind data show that in the period June to September is the peak of the upwelling phenomenon.
Spatio-Temporal Annual Changes of Mangrove Vegetation Coverages in Porong Estuary Based on Sentinel-2 Imagery Herlambang Aulia Rachman; Abd Rahman As-Syakur
Rekayasa Vol 16, No 1: April 2023
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v16i1.18882

Abstract

Mangrove is a typical coastal ecosystem with high productivity and has a number of ecosystem services. However this ecosystem is vulnerable particularly in urban areas due to land use change and illegal logging. Sidoarjo is one of the most developed urban area in the East Java Province, with mangrove ecpsystem scattered along the Porong estuary. This estuary is also the location of mudflow from the famous Lapindo mud disaster since 2006. This study aims to analyze the changes of mangrove coverages around the Porong estuary using satellite imagery data. Fractional Vegetation Coverage (Fv) was used to quantify the changes of mangrove vegetation coverage of Mangrove Forest from 2015 – 2021. The results show that there is a change in mangrove coverages in the area of study. The high change from lo vegetation coverage (LVC) to Full Vegetation Covarege (FCV) as found in the mouth of Porong River. This condition maybe caused by sedimentation process due to mudflow from volcanic disasters. 
Co-Authors Abd. Rahman As-syakur Fadli Syamsudin Jonson Lumban Gaol