Studi Sebaran Material Padatan Tersuspensi Di Muara Sungai Sambong, Kabupaten Batang

*Ahmad Fikri Delardi  -  Oceanography Department, Faculty of Fisheries and Marine Science, University of Diponegoro, Indonesia
Siddhi Saputro  -  Oceanography Department, Faculty of Fisheries and Marine Science, University of Diponegoro, Indonesia
Warsito Atmodjo scopus  -  Oceanography Department, Faculty of Fisheries and Marine Science, University of Diponegoro, Indonesia
Heriyoso Setyono scopus  -  Oceanography Department, Faculty of Fisheries and Marine Science, University of Diponegoro, Indonesia
Rikha Widiaratih  -  Oceanography Department, Faculty of Fisheries and Marine Science, University of Diponegoro, Indonesia
Aris Ismanto scopus  -  Oceanography Department, Faculty of Fisheries and Marine Science, University of Diponegoro, Indonesia
Received: 6 Nov 2019; Revised: 7 Nov 2019; Accepted: 7 Nov 2019; Published: 7 Nov 2019; Available online: 7 Nov 2019.
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Abstract

Muara Sungai Sambong berpotensi mengalami pendangkalan akibat pengendapan sedimen tersuspensi. Kali Sambong terus mengalami pendangkalan karena sedimentasi dan sampah sekaligus alur menuju muara pantai yg mengalami penyempitan. Tujuan dari penelitian ini adalah untuk mengetahui pengaruh arus dalam persebaran MPT di Muara Sungai Sambong, Kabupaten Batang, Jawa Tengah.

Penelitian dimulai dari tahap pengambilan data di lapangan pada tanggal 7-9 Maret 2017 di Perairan Muara Sungai Sambong, Batang dan tahap pengolahan serta analisis data hasil pengukuran lapangan. Materi yang digunakan meliputi data primer berupa sampel air laut serta data lapangan kecepatan dan arah arus saat pasang maupun surut selama 3 hari, sedangkan data sekunder berupa data pasang surut bulan Maret 2017 dan citra GeoEye tahun 2017. Penelitian ini menggunakan metode analisis kuantitatif model, penentuan lokasi pengambilan sampel air menggunakan metode purposive sampling, pengambilan data arus menggunakan metode lagrange. Model matematik yang digunakan adalah Mike21 Flow Model FM untuk pola arus dan metode interpolasi sebaran MPT dengan ArcGIS menggunakan metode Natural Neighbor.

Berdasarkan hasil dari penelitian ini menunjukkan bahwa kecepatan arus pada kondisi pasang menuju surut memiliki nilai antara 0,168 m/dt – 1,111 m/dt, sedangkan pada kondisi surut menuju pasang memiliki nilai antara 0,164 m/dt – 1,25 m/dt. Nilai material padatan tersuspensi pada kondisi pasang menuju surut memiliki nilai antara 0,08 – 0,29 g/L, sedangkan pada kondisi surut menuju pasang memiliki nilai antara 0,06 – 0,35 g/L. Berdasarkan hasil penelitian dapat disimpulkan bahwa pengaruh arus terhadap sebaran konsentrasi MPT, cukup tinggi. 

Kata Kunci : MPT, Mike21 Flow Model FM, Pengaruh Arus

 

Sambong Estuary potentially suffering to shallow as the result of suspended sedimentation. Sambong River is shallowing due to sedimentation and debris which also narrowing the river channel. The purpose of this study is to observe the effect of current to Total Suspended Solid (TSS) distribution in Sambong Estuary, Batang Regency, Central Java.

The study was begin from field collecting data on 7-9 March 2017 in Sambong Estuary waters, Batang and then the data proceed and analized. Material of this study was consist of primary data, which are seawater sampel, current velocity and direction while tide and neap, and secondary data, which are tidal data on March 2017 and GeoEye image on 2017.  Quantitative model analysis was used in this study, purposive sampling method was used on collecting the water sampel and lagrange method was used for current data collecting. Mike21 Flow Model FM was used for current model and TSS interpolation method was using ArcGIS by Natural Neighbor method.

The result of this study showed that current velocity in tide to neap condition was 0.168 m/s – 1.111 m/s, while in neap to tide condition was 0.164 m/s – 1.25 m/s. Total Suspended Solid value tide to neap condition was 0.08 g/L – 0.29 g/L, while in neap to tide condition was 0.06 g/L – 0.35 g/L. According to this study the effect of current to TSS was high.

Keywords : TSS, Mike21 Flow Model FM, Current Effect

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