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Distribusi Sedimen Dasar Sebagai Identifikasi Erosi Pantai Di Kecamatan Brebes [PAPER]

ABSTRACT The dynamics of erosion and accretion in the coastal area of Brebes Subdistrict have many impacts on mangrove destruction an...



ABSTRACT

The dynamics of erosion and accretion in the coastal area of Brebes Subdistrict have many impacts
on mangrove destruction and coastal region. The erosion and accretion are influenced by oceanography parameters that can affect the distribution of coastal sediments. The aims of this research were to determine the characteristics of the phenomenon of erosion and accretion in coastal Brebes Subdistrict and shape appropriate mitigation to reduce the erosion. This research is done with the bed sediment sampling using grab sampler for 26 sampling point. Current and tide measurement are conducted wih ADCP deployment for 15 days’ measurement. Sediment characteristic analysis done with granulometri and statistic analysis. The average of sediment sorting is 1.21, skewness is 0.088 and the kurtosis is 3.76. Generally, bed surface sediment distribution pattern is dominated by clay to sand, the grand size distribution of sediments are sand, silt, sandy silt and silty sand. Longshore current speed ranged between 0-0.12 m.s -1 at the spring tide condition and ranged between 0-0.08 m.s -1 at the neap tide condition, the domination of current direction towards to the East and Northeast. The mitigation is very needed to rearrange the mangrove areas, build the coastal protection and recover the main river line which is the sourceof the sediment materials, so that can be provide the supply of sediment deposition in the coastal area.

Keywords: Brebes, Erosion, Longshore Current, Mitigation, Sediment


ABSTRAK

Dinamika kawasan pesisir Kecamatan Brebes berupa bencana abrasi dan akresi yang terjadi memiliki dampak besar terhadap kerusakan kawasan mangrove dan pesisir. Fenomena erosi dan akresi yang terjadi dipengaruhi oleh parameter oseanografi yang dapat mempengaruhi sebaran sedimen di pesisir. Penelitian ini bertujuan untuk mengetahui karakteristik distribusi sedimen dasar perairan sebagai upaya identifikasi bencana erosi yang terjadi di pesisir Kecamatan Brebes. Penelitian dilakukan dengan pengambilan sampel sedimen dasar perairan menggunakan metode grab sampler terhadap 26 titik pengambilan. Pengukuran kecepetan arus di lokasi penelitian dilakukan dengan pemasangan ADCP selama 15 hari. Analisis karakteristik sedimen dilakukan dengan metode analisis granulometri dan statistic sedimen. Nilai rata-rata sortasi 1.21, skewness 0.088 dan kurtosis 3.76. Secara umum, pola sebaran sedimen permukaan dasar laut Kec.Brebes didominasi oleh sedimen berukuran lempung-pasir. Jenis sedimen berdasarkan ukuran butirnya yaitu pasir, pasir lanauan, lanau pasiran dan lanau. Kecepatan arus sepanjang pantai hasil model pada kondisi purnama berkisar 0-0,12 m.s -1 dan pada saat perbani berkisar antara 0-0,08 m.s -1, dengan dominasi arah arus menuju ke Timur dan Timur laut. Perlu dilakukan penataan ulang terhadap kawasan mangrove dan bangunan pelindung pantai serta melakukan pencodetan terhadap sungai – sungai utama yang merupakan sumber pembawa material sedimen sehingga dapat memberikan suplay endapan sedimen di bagian pesisir.

Kata Kunci: Brebes, erosi, arus sepanjang pantai, mitigasi, sedimen



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RSGIS INDONESIA: Distribusi Sedimen Dasar Sebagai Identifikasi Erosi Pantai Di Kecamatan Brebes [PAPER]
Distribusi Sedimen Dasar Sebagai Identifikasi Erosi Pantai Di Kecamatan Brebes [PAPER]
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RSGIS INDONESIA
https://www.rsgis.info/2019/10/distribusi-sedimen-dasar-sebagai-identifikasi-erosi-pantai-di-kecamatan-brebes.html
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https://www.rsgis.info/
https://www.rsgis.info/2019/10/distribusi-sedimen-dasar-sebagai-identifikasi-erosi-pantai-di-kecamatan-brebes.html
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