Update Artikelilmiah: 52011

AFIFAH BERLIANA ILMA

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Abstrak (Bhs. Indonesia)

Perubahan garis pantai di kawasan Pelabuhan PLTU Karangkandri Cilacap merupakan fenomena dinamis yang dipengaruhi oleh gelombang, arus, pasang surut, serta keberadaan breakwater. Penelitian ini bertujuan untuk mengidentifikasi pergerakan garis pantai, menganalisis laju perubahannya, serta mengestimasi volume angkutan sedimen pada periode 2006–2016. Ekstraksi garis pantai dilakukan menggunakan citra satelit Landsat multitemporal melalui platform Google Earth Engine (GEE) dengan pendekatan Normalized Difference Water Index (NDWI), kemudian dilakukan koreksi pasang surut menggunakan data prediksi dari XTIDE agar seluruh garis pantai mengacu pada elevasi Mean Sea Level (MSL). Analisis laju perubahan garis pantai dilakukan menggunakan ArcMap dengan ekstensi Digital Shoreline Analysis System (DSAS) melalui perhitungan parameter Shoreline Change Envelope (SCE) dengan total nilai 15.989,96 meter, Net Shoreline Movement (NSM) dengan total nilai 1.025,44 meter, End Point Rate (EPR) dengan total nilai 101,81 meter/tahun, dan Linear Regression Rate (LRR) dengan total nilai -614,46 meter/tahun. Estimasi angkutan sedimen dihitung berdasarkan pendekatan perubahan luasan garis pantai per transek yang dikonversi menjadi volume sedimen sebesar 23.328,76 m³. Hasil analisis menunjukkan adanya perbedaan kecenderungan perubahan garis pantai antara segmen barat dan timur breakwater. Seluruh hasil analisis menunjukkan bahwa segmen barat mengalami erosi, sedangkan segmen timur mengalami akresi.

Abtrak (Bhs. Inggris)

Shoreline changes in the Karangkandri PLTU Port area, Cilacap, represent a dynamic phenomenon influenced by wave action, currents, tidal fluctuations, and the presence of a breakwater. This study aims to identify shoreline movement, analyze the rate of shoreline change, and estimate sediment transport volume over the period 2006–2016. Shoreline extraction was conducted using multitemporal Landsat satellite imagery processed through the Google Earth Engine (GEE) platform employing the Normalized Difference Water Index (NDWI) approach. The extracted shorelines were subsequently corrected for tidal influence using tidal prediction data from XTIDE to ensure that all shoreline positions were referenced to Mean Sea Level (MSL). The rate of shoreline change was analyzed using ArcMap software with the Digital Shoreline Analysis System (DSAS) extension by calculating the parameters Shoreline Change Envelope (SCE) with a total value of 15.989,96 meters, Net Shoreline Movement (NSM) with a total value of 1.025,44 meters, End Point Rate (EPR) with a total value of 101,81 meters/year, and Linear Regression Rate (LRR) with a total value of −614,46 meters/year. Sediment transport estimation was determined based on the shoreline area change per transect, which was then converted into sediment volume of 23.328,76 m³. The results indicate a contrasting pattern of shoreline change between the western and eastern segments of the breakwater. Overall, the western segment experienced erosion, whereas the eastern segment underwent accretion.

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