Pola Arus dan Sebaran Sedimen Dasar di Perairan Jepara

*Syafiq Muhammad Aziz  -  Oceanography Department, Faculty of Fisheries and Marine Science, University of Diponegoro, Indonesia
Baskoro Rochaddi scopus  -  Oceanography Department, Faculty of Fisheries and Marine Science, University of Diponegoro, Indonesia
Gentur Handoyo scopus  -  Oceanography Department, Faculty of Fisheries and Marine Science, University of Diponegoro, Indonesia
Muslim Muslim scopus  -  Oceanography Department, Faculty of Fisheries and Marine Science, University of Diponegoro, Indonesia
Petrus Subardjo scopus  -  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: 6 Nov 2019; Accepted: 7 Nov 2019; Published: 7 Nov 2019; Available online: 7 Nov 2019.
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Abstract

Pantai Kartini merupakan pantai yang terletak di wilayah Kabupaten Jepara, terdapat aktifitas pelayaran yang cukup ramai. Adanya jetty dan aktivitas pengerukan di sekitar perairan Pantai Kartini dapat menyebabkan perubahan pola arus dan sebaran ukuran butir sedimen dasar. Penelitian ini bertujuan untuk mengetahui pola arus dan sebaran sedimen dasar permukaan di perairan Pantai Kartini, Jepara. Metode yang digunakan dalam penelitian ini adalah metode kuantitatif dan penentuan lokasi pengambilan sampel sedimen menggunakan metode purposive sampling. Data yang diperlukan untuk mengetahui pola arus yaitu pasang surut, dan data kedalaman perairan menggunakan instrumen singlebeam echosounder. Sedangkan data yang diperlukan untuk mengetahui persebaran ukuran butir sedimen yaitu sampel sedimen dasar. Pengolahan data menggunakan Microsoft Excel, ArcGIS 10.3, Mike21, WrPlot, worldCurrent1.0, sedangkan sampel sedimen diolah menggunkan metode pengayakan dan pemipetan. Hasil dari penelitian ini menunjukan bahwa ukuran butir sedimen dasar yang ditemukan berupa Pasir, Pasir Lanauan dan Lanau.  Perairan Pantai Kartini, Jepara memiliki bilangan Formzahl (F) sebesar 1,10 sehingga tergolong pasang surut tipe campuran condong ke harian ganda. Berdasarkan hasil pengolahan software worlc current 1.0 arus rata – rata menunjukkan 74,6% arus pasut (astronomic) dan 25,5% arus non–pasut (residual). Pola arus perairan Pantai Kartini Jepara pada saat pasang menujuh ke utara dan pada saat surut menuju ke Barat Daya.

Kata Kunci: Sedimen Dasar, Arus, Pantai Kartini

  

Kartini Beach is a beach located in Jepara Regency, there are quite busy shipping activities. The existence of jetties and dredging activities around the waters of Kartini Beach can cause changes in flow patterns and size distribution of basic sediment grains. The purpose of this study is to determine the flow patterns and distribution of surface sediment in the waters of Kartini Beach, Jepara. The method used in this study is the quantitative method and the determination of the location of sediment sampling using the purposive sampling method. Data that needed to determine the pattern of currents namely tides, and water depth data using single beam echosounder. Meanwhile the data needed to study sediment size samples are basic sediment samples, Data processing using Microsoft Excel, ArcGIS 10.3, Mike21, WrPlot, world Current 1.0, meanwhile sediment samples are processed using filtering and pipette methods. The results of this study indicate that the size of the sediment grains found were sand, silt sand and silt. The Fromzahl (F) number is 1,10 so it is classified as a mixed tide prevailing semidiurnal. Based on the results of the processing by using World Current 1.0, as much as 74.6% of the tidal currents (astronomic) and 25.4% is non-tidal currents (residual). Flow pattern from kartini beach at high tide to the north and at low tide to the Southwest 

Keywords: Seabad Sediment, Current, Kartini Beach. 

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