AbstrakDaerah perairan muara Sungai Silugonggo merupakan salah satu wilayah yang terletak di pesisir Laut Jawa, Kabupaten Pati. Pada daerah pesisir di wilayah perairan ini terdapat pemukiman penduduk, pertambakan dan terdapat kawasan mangrove yang merupakan sumber utama nutrien yang masuk di perairan tersebut. Kondisi ini menyebabkan wilayah perairan muara Sungai Silugonggo akan mengalami persebaran sesuai dengan dinamika oseanografi. Tujuan penelitian ini adalah mengetahui pola sebaran dan nilai kandungan klorofil-a serta mengetahui pola arus yang mempengaruhi sebaran klorofil-a secara horizontal di Perairan Muara Sungai Silugonggo, Kecamatan Batangan, Pati. Penelitian ini menggunakan data primer berupa klorofil-a, nutrien, parameter kualitas perairan, arus dan data sekunder adalah bathimetri dan pasang surut. Pengolahan data menggunakan pemodelan numerik. Hasil penelitian ini menunjukkan nilai kandungan klorofil-a berdasarkan tanggal sampling berada pada kisaran 0,4981-12,1307 mg/m 3 dan memiliki nilai ratarata setiap pengambilan sebesar 2,5348, 3,2425 dan 3,8499 mg/m 3 . Berdasarkan hasil pengamatan menunjukkan bahwa nilai kandungan klorofil-a secara horizontal di Perairan Muara Sungai Silugonggo lebih dipengaruhi oleh masukan dari sungai, vegetasi mangrove dan daerah pertambakan. Sebaran klorofil-a di Perairan Muara Sungai Silugonggo memiliki pola mengarah dari wilayah muara sungai ke arah laut. Persebaran klorofil-a secara horizontal dominan dipengaruhi oleh arus dengan pola mengarah dari timur laut (45º) ke arah barat daya (225º) dengan kecepatan berkisar 0,03-0,15 m/det. Kata Kunci: Sebaran, Horizontal, Klorofil-a, Silugonggo, Fisik-Kimia Perairan AbstracSilugonggo estuary is an area located in coast of Java Sea, Pati. In the coastal region in this territorial waters, there are settlements, fish ponds and mangrove area, which is a major source of nutrients for the waters. This condition causes the territorial waters of Silugonggo River estuary will have distribution in according with the Oceanographic dynamics. The purpose of this research is to know the value and distribution pattern of chlorophll-a and figure out the pattern of currents influencing the distribution of chlorophyll-a horizontally in the waters of the Silugonggo River estuary, Batangan District, Pati. The primary data which were used in this research was chlorophyll-a, the quality of the waters, nutrients, currents and the secondary data was bathymetry and tide. Data processing used numerical modeling. The results of this research reveals the value of chlorophyll-a based on the sampling dates were in the range of 0.4981-12.1307 mg/m 3 and had an average rating of any taking of 2.5348, 3.2425 and 3.8499 mg/m 3 . Based on the observation indicated that the horizontal contents value of chlorophyll-a in waters of the Silugonggo River estuary was influenced by input from rivers, mangrove vegetation and fish pond areas. Distribution of chlorophyll-a in waters of the Silugonggo River estuary had a pattern leading from the mouth of the River towar...
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