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All Journal Jurnal Kelautan : Indonesian Journal of Marine Science and Technology
Wisnu Arya Gemilang
Research Institute for Coastal Resources and Vulnerability Agency for Marine and Fisheries Research and Development, Ministry of Marine Affairs and Fisheries

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DISTRIBUSI SEDIMEN DASAR SEBAGAI IDENTIFIKASI EROSI PANTAI DI KECAMATAN BREBES MENGGUNAKAN ANALISIS GRANULOMETRI Wisnu Arya Gemilang; Ulung Jantama Wisha; Guntur Adhi Rahmawan
Jurnal Kelautan Vol 10, No 1 (2017)
Publisher : Department of Marine Sciences, Trunojoyo University of Madura, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/jk.v10i1.2156

Abstract

Dinamika kawasan pesisir Kecamatan Brebes berupa bencana abrasi dan akresi yang terjadi memiliki dampak besar terhadap kerusakan kawasan mangrove dan pesisir. Fenomena abrasi dan akresi yang terjadi dipengaruhi oleh parameter oseanografi yang dapat mempengaruhi sebaran sedimen di pesisir. Penelitian ini bertujuan untuk mengetahui karakteristik pembangkit fenomena abrasi dan akresi di pesisir Kecamatan Brebes serta bentuk mitigasi yang tepat untuk mengurangi bencana abrasi. Metode yang digunakan adalah descriptive kuantitatif dan analisis yang dilakukan adalah pengukuran arus, pengukuran pasang surut, pemetaan batimetri, analisis ukuran butir sedimen dan pemodelan hidrodinamika 2 dimensi. Sedimen berupa pasir, lanau, dan pasir lanauan dengan nilai rerata ukuran butir 5.00 phi – 8.00 phi. 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, sedimenBED SEDIMENT DISTRIBUTION FOR IDENTIFICATION OF THE COASTAL EROSION IN BREBES SUBDISTRICT USING GRANULOMETRI ANALYSISThe 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-1at 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
GEJALA INTRUSI AIR LAUT DI DAERAH PESISIR PADELEGAN, PADEMAWU DAN SEKITARNYA Wisnu Arya Gemilang; Gunardi Kusumah
Jurnal Kelautan Vol 9, No 2: Oktober (2016)
Publisher : Department of Marine Sciences, Trunojoyo University of Madura, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/jk.v9i2.1117

Abstract

Sebagian wilayah pesisir Pademawu dan sekitarnya, Pamekasan, dijumpai adanya air tanah payau hingga asin dengan pelamparan yang cukup luas. Tujuan penelitian ini adalah untuk memetakan sebaran air tanah asin hingga payau tersebut, baik pada akuifer dangkal maupun akuifer dalam dan juga untuk mengetahui penyebab keasinan air tanah tersebut. Sebaran air tanah asin dipetakan berdasarkan nilai daya hantar listrik (DHL) dengan kriteria tingkat keasinan sebagaimana ditetapkan oleh Panitia Ad Hoc Intrusi Air Asin Jakarta. Sedangkan penyebab keasinan air tanah dianalisa berdasarkan fasies hidrokimia dengan diagram Trilinier Piper. Hasil penelitian menunjukkan bahwa pada akuifer dangkal air tanah agak payau hingga asin dengan nilai DHL 15.000 µS/cm – 50.000 µS/cm dijumpai pada bagian Selatan Pademawu sepanjang pesisir pantai meliputi Padelegan, Jumiang, Tanjung, Manjungan dan Pademawu Timur. Sedangkan untuk air tanah dalam seluruhnya dalam kondisi tawar dengan nilai DHL 1500 µS/cm, berada pada bagian Utara dari daerah penelitian meliputi kecamatan Tlanakan, Galis, Pamekasan dan  Larangan. Berdasarkan nilai DHL bahwa daerah bagian Utara penelitian tidak terdeteksi adanya proses penyusupan air laut pada air tanah.INDICATION OF SEA WATER INTRUSION IN COASTAL PADELEGAN, PADEMAWU AREAIn the part of Pademawu coastal areas, Pamekasan, was found brackish groundwater that spreading progressively. The purpose of this study was to map the distribution of salt to brackish groundwater, both in the shallow aquifer and the deep aquifer and also to find out the cause of the salinity of the ground water. Salt groundwater distribution was mapped based on the electrical conductivity (EC) with a salinity level criteria as established by Panitia Ad Hoc Intrusi Air Asin Jakarta. While the causes of groundwater salinity were analyzed based on hydrochemical facies with Trilinier Piper diagram. The results showed that the shallow groundwater aquifers slightly brackish to salt with DHL value 15,000 μS / cm - 50,000 μS / cm found in the southern part of Pademawu along the coast include Padelegan, Jumiang, Tanjung, Manjungan and Eastern Pademawu. As for the groundwater at deep aquifer entirely in fresh condition with DHL value 1500 μS / cm, located in the northern part of the study area that include Tlanakan, Galis, Pamekasan and Larangan districts. Based on the DHL value, it shown that groundwater of the northern part of the study area was not affected by the sea water intrusion.Keywords: Electric conductivity, sea water intrusion, aquifer, Pademawu 
Co-Authors Gunardi Kusumah Guntur Adhi Rahmawan Ulung Jantama Wisha