ANGGRAENI, DYAS ISTI (2023) ANALISIS KOMPONEN HARMONIK PASANG SURUT DAN FLUKTUASI MUKA AIR LAUT DI PERAIRAN CILACAP, JAWA TENGAH (23dos330). Undergraduate thesis, Fakultas Perikanan dan Ilmu Kelautan.

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Abstract

ABSTRAK

(Dyas Isti Anggraeni. 26050119130064. Analisis Komponen Harmonik Pasang Surut dan Fluktuasi Muka Air Laut di Perairan Cilacap, Jawa Tengah. Warsito Atmodjo dan Rikha Widiaratih).

Pemahaman kondisi pasang surut berupa komponen harmonik, tipe, dan elevasi muka air sangat diperlukan bagi segala aktivitas di wilayah pesisir dan laut. Pasang surut juga dapat menggambarkan kondisi fluktuasi muka air laut untuk mengetahui fenomena kenaikan muka air. Oleh karena itu, penelitian ini bertujuan untuk mengetahui informasi pasang surut dan fluktuasi muka air laut di Perairan Cilacap. Data yang digunakan adalah data pasang surut dan suhu udara periode tahun 2018-2022, serta metode yang digunakan adalah metode kuantitatif. Pengolahan data pasang surut dilakukan pada perangkat lunak Microsoft Excel dengan metode Admiralty, serta pada perangkat lunak MATLAB 2014a dengan metode Least Square. Sedangkan itu, data suhu udara diolah dengan metode statistik sederhana. Hasil penelitian menunjukkan nilai amplitudo metode Admiralty dan Least Square didominasi komponen M2 yang dipengaruhi gaya tarik bulan. Sedangkan beda fase metode Admiralty dan Least Square didominasi komponen K2 yang berupa gabungan gaya tarik bulan dan matahari. Perairan Cilacap memiliki tipe pasang surut campuran condong ke harian ganda dengan nilai rata-rata bilangan Formzahl metode Admiralty sebesar 0,418 – 0,421 dan metode Least Square sebesar 0,392 – 0,485. Pada hasil juga diperoleh nilai rata-rata elevasi HHWL untuk metode Admiraty dan Least Square sebesar 271,64 dan 273,36 cm; MHWL sebesar 234,37 dan 235,78 cm; MSL sebesar 155,98 dan 156,40 cm; MLWL sebesar 77,59 dan 77,02 cm; serta LLWL sebesar 40,32 dan 39,44 cm. Selisih nilai amplitudo kedua metode pada setiap komponen, serta selisih nilai setiap elevasi muka air kurang dari 2 cm. Berdasarkan hasil, laju kenaikan muka air laut di Perairan Cilacap periode tahun 2018-2022 sebesar 3,69 cm/tahun dan laju kenaikan suhu udara sebesar 0,067°C/tahun.

Kata Kunci: Admiralty, Kenaikan Muka Air Laut, Komponen Harmonik, Least Square, Pasang Surut.

ABSTRACT

(Dyas Isti Anggraeni. 26050119130064. Analysis of Tidal Harmonic Components and Sea Level Fluctuations in Cilacap Waters, Central Java. Warsito Atmodjo and Rikha Widiaratih).

The comprehension of tidal conditions such as harmonic components, types, and water level elevation are very important for various activities in coastal and marine areas. Tides can also describe the sea level fluctuations to determine the phenomenon of sea level rise. Therefore, the purpose of this study is to find out about information of tidal conditions and sea level fluctuations in Cilacap Waters. The data used is tidal data and air temperature for the period 2018-2022, also the method used is a quantitative method. Tidal data processing was carried out on Microsoft Excel software using the Admiralty method, also on MATLAB 2014a software using the Least Square method. Meanwhile, air temperature data was processed using simple statistical methods. The results of this study showed that the amplitude values of the Admiralty and Least Square methods were dominated by the M2 component as the influence of the moon's gravitational force. While the phase difference of the Admiralty and Least Square methods were dominated by the K2 component which is a combination of the moon and sun’s gravitational force. The Cilacap waters have a type of mixed-semidiurnal tide with the Formzahl number value of the Admiralty method of 0,418 - 0,421 and the Least Square method of 0,392 - 0,485. The results also showed that the average HHWL elevation values for the Admiraty and Least Square methods are 271,64 and 273,36 cm; MHWL of 234,37 and 235,78 cm; MSL of 155,98 and 156,40 cm; MLWL of 77,59 and 77,02 cm; and LLWL of 40,32 and 39,44 cm. The difference in the amplitude values of the two methods for each component, also the difference in the values for each water level elevations are less than 2 cm. Based on the results, the rate of sea level rise in Cilacap Waters for the 2018-2022 period is 3,69 cm/year and the rate of increase in air temperature is 0,067°C/year.

Keywords: Admiralty, Harmonic Components, Least Square, Sea Level Rise, Tides.

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