On the Vertical of Suspended Sediment Transport in Dumai Estuary

Abstract

Study of suspended sediment transport in Dumai Estuary is investigated. Observation of suspended sediment, bed sediment, salinity, tidal elevation and surface current were conducted in the surrounding the mouth of estuaries. The observation was conducted at Northwest monsoon in two tidal cycle. The results show that the land effect more dominant in this research area and the salinity at the surface is higher at low to high period than high to low periods. The bottom sediments are composed by mud and fine sand with 70 % for mud, 25% for fine sand and 5% is gravel. The measurement of suspended sediment also shows that sediment concentration higher at the high to low tide than low to high tide. The vertical suspended sediments in the vertical diraction is about 50-460 mg/l. The high concentration observed at the surface layer and decrease to the bottom. Comparision between analytical model dan observation in vertical structure of sediment transport showed a good agreements. The concentration of sediment in a Dumai river lower compared with Rupat strait, this revealed that the Dumai river is only a tiny fraction of a source of suspended sediment in that area.

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The Concentrations and Distributions of Heavy Metals Pb, Cu and Zn in the Sea Water and Sediment in Estuary Area of Dumai, Riau Province

Abstract

The research of heavy metal (Pb, Cu, Zn) has been conducted in June 2015 in the estuary area of Dumai, Riau Province. The samples of water and sediment were taken in difference area, consisting of 15 stations by purposive sampling method. The analysis showed heavy metal contents were as followes Pb 0.051 – 0.061 mg/l, Cu 0.038 – 0.047 mg/l, and Zn 0.182 – 0.243 mg/l respectively. The heavy metal contents in water has exceeded the quality standard of Kep.MENLH/51/2004 on sea water quality standard for marine organism. On the other hand, the sediment analysis showed heavy metal contents were Pb 2.700 –3.500 µg/g, Cu 2.522 – 6.97 µg/g and Zn 15.977 – 18.059 µg/g. According to thisresearch it was concluded that the estuary area of Dumai has been contaminated. 

Key words : Heavy metal, seawater, sediment, estuary area of Dumai.

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ANALISIS SUHU PERMUKAAN LAUT SELAT MALAKA

ABSTRAK 

Pengetahun mengaenai sebaran SST dalam suatu perairan sangat penting untuk banyak hal, terutama yang terkait dengan penelitian lain maupun dalam pemanffaattanya. Suhu permukaan laut merupakan factor oseanografi yang sangat penting sebagai penggerak terjadinya siklus musim baik di daerah tropis maupun subtropis. Penggunaan  data penginderaan  jauh  MODIS  sangat  baik  untuk pemantauan SST  karena  mempunyai resolusi spasial dan temporal yang tinggi,  sehingga perubahan suhu  secara  berkala  dapat dilihat  dan  pola  sebarannya  dapat  dianalisis. Tujuan  dari  penelitia ini adalah  memetakan dan menganalisis variasi sebaran SPL di perairan Selat Malaka selama tahun 2015 pada musim barat dan musim timur. Data yang digunakan adalah data MODIS Aqua/Terra pada tahun 2015.  Hasil  pengolahan  data  MODIS  menunjukan  variasi  pola  Sebaran  SST bulanan  satu tahun terahir, sebaran SST perairan Selat Malaka  dipengaruhi  oleh angin musim. Nilai SST minimum di perairan Selat Malaka terjadi pada bulan February 28,12oC pada Musim Barat di bagian tenggara perairan Selat Malaka, Rendahnya SST pada periode musim Barat dikarenakan massa air yang lebih dingin dari Laut China Selatan mengalir menuju perairan bagian timur Sumatera. Untuk sebaran SST maksimum terjadi pada bulan Mei 30,81oC Musim  Peralihan I di bagian tenggara perairan Selat Malaka. Untuk suhu ratarata pada tahun 2015 di perairan Selat Malaka yaitu 29,69oC, Secara umum Variabilitas sebaran SST di Selat Malaka merata pada setiap bulannya.

Kata kunci: SPL, Angin Musim, Selat Malaka.

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