Prediksi Penurunan Muka Air Tanah terhadap Banjir Rob di Kawasan Pesisir Kota Jakarta
Abstract
Kota Jakarta merupakan kota pesisir yang sangat rentan terhadap perubahan tinggi air laut. Selain itu, Kota Jakarta mengalami pertumbuhan yang sangat pesat sehingga kurang dapat memenuhi kebutuhan dasar penduduknya, termasuk infrastruktur air bersih, sehingga penduduk Kota Jakarta menggunakan air tanah dalam memenuhi kebutuhan air bersihnya. Pengambilan air tanah yang berlebihan di kawasan pesisir akan menyebabkan permukaan tanah menjadi semakin menurun, sehingga air laut akan masuk ke daratan. Penelitian ini bertujuan untuk dapat mengetahui kecenderungan kondisi bencana banjir rob, serta kebutuhan mitigasi bencana banjir rob di kawasan pesisir Kota Jakarta di masa yang akan datang. Variabel yang digunakan adalah penggunaan air tanah yang diproyeksikan menggunakan metode Holt-Winter, penurunan ellipsoid, dan penurunan permukaan air tanah yang diproyeksikan menggunakan metode Holt Linear, dan tren fluktuasi ketinggian air laut yang didapat dengan melalui metode SES. Melalui analisis time series, dapat dilakukan identifikasi dan prediksi terhadap kecamatan yang mengeksploitasi air tanah, dan diketahui bahwa Kota Jakarta akan menghadapi puncak ketinggian air laut pada tahun 2023 setinggi 2,44 mdpl ketika elevasi pesisir kota mencapai level 71,8 cm. Indikasi perencanaan mitigasinya adalah untuk melanjutkan pembangunan NCICD seawall hingga tahun 2023, dan mengurangi konsumsi air tanah.
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DOI: http://dx.doi.org/10.12962/j2716179X.v17i2.14674
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