Struktur Komunitas Organisme Penempel pada Media Beton Dengan Variasi Komposisi Fly Ash - Bottom Ash (FABA) di Perairan Suramadu

Selvia, Mila (2026) Struktur Komunitas Organisme Penempel pada Media Beton Dengan Variasi Komposisi Fly Ash - Bottom Ash (FABA) di Perairan Suramadu. Masters thesis, Institut Teknologi Sepuluh November.

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Abstract

Pertumbuhan organisme biofouling pada infrastruktur pesisir merupakan permasalahan yang dapat memengaruhi kinerja serta umur material, sehingga diperlukan pemahaman mengenai faktor - faktor yang memengaruhi proses penempelan dan perkembangan organisme tersebut. Penelitian ini bertujuan untuk menganalisis pengaruh variasi komposisi beton berbahan dasar fly ash - bottom ash (FABA) terhadap struktur komunitas, persentase tutupan, dan laju pertumbuhan organisme fouler. Penelitian dilakukan melalui metode perendaman media beton dengan empat variasi komposisi FABA yang terdiri atas beton kontrol (tanpa penambahan FABA), MB0, MB25, MB50, dan MB75 di perairan pesisir selama periode perendaman hingga 90 hari. Pengamatan dilakukan pada sisi atas dan sisi lateral media beton dengan interval waktu pengamatan 15 hari. Parameter yang diamati meliputi komposisi komunitas dan persentase tutupan organisme fouler pada permukaan media beton. Hasil penelitian menunjukkan bahwa terdapat organisme fouler meliputi alga filamen, teritip: Amphibalanus sp, Balanus trigonus, Amphibalanus reticulatus, dan Amphibalanus amphitrite, bivalvia, serta Spirobranchus triqueter. Alga filamen berperan sebagai kolonis awal pada fase perendaman awal, kemudian diikuti oleh peningkatan organisme hard-fouler pada fase perendaman selanjutnya. Persentase tutupan organisme fouler secara umum menunjukkan peningkatan seiring bertambahnya waktu perendaman dengan rata - rata tutupan >80%*. Namun demikian terdapat variasi antar komposisi beton FABA, dengan luas penutupan organisme fouler pada media MB75 sisi atas menunjukkan nilai tutupan sebesar 49,09%, sedangkan media MB50 pada sisi lateral menunjukkan nilai tutupan sebesar 30,14%, relatif lebih rendah dibandingkan media beton lainnya. Perbedaan nilai tutupan tersebut menunjukkan bahwa variasi komposisi beton FABA memengaruhi intensitas kolonisasi dan laju pertumbuhan organisme fouler, yang diduga berkaitan dengan perbedaan tingkat kekasaran permukaan media beton. Perbedaan kekasaran permukaan FABA juga memberikan pengaruh dalam menyediakan mikrohabitat dan meningkatkan keberhasilan penempelan organisme fouler.
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The growth of biofouling organisms on coastal infrastructure represents a significant issue that can affect material performance and service life, there by necessitating a thorough understanding of the factors influencing organism attachment and development. This study aimed to analyze the effects of variations in fly ash–bottom ash (FABA)–based concrete composition on community structure, percentage cover, and growth rate of fouling organisms. The research was conducted using an immersion method, in which concrete panels with four FABA composition variants—namely control concrete (without FABA addition), MB0, MB25, MB50, and MB75—were deployed in coastal waters for an immersion period of up to 90 days. Observations were carried out on the upper and lateral surfaces of the concrete media at 15-day intervals. The observed parameters included community composition and percentage cover of fouling organisms on the concrete surfaces. The results indicated the presence of fouling organisms comprising filamentous algae, barnacles (Amphibalanus sp., Balanus trigonus, Amphibalanus reticulatus, and Amphibalanus amphitrite), bivalves, and the polychaete Spirobranchus triqueter. Filamentous algae acted as early colonizers during the initial immersion phase, followed by an increased dominance of hard-fouling organisms in the subsequent immersion stages. Overall, the percentage cover of fouling organisms increased with immersion time, with an average coverage exceeding 80%. However, variations were observed among different FABA concrete compositions. The upper surface of MB75 exhibited a fouling coverage of 49.09%, while the lateral surface of MB50 showed a lower coverage of 30.14% compared to other concrete media. These differences in coverage indicate that variations in FABA concrete composition influence the intensity of colonization and growth rates of fouling organisms, which are likely related to differences in surface roughness of the concrete media. Variations in FABA surface roughness also play a role in providing microhabitats and enhancing the attachment success of fouling organisms.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	composition type, coverage area, barnacles, biofouling, fly ash - bottom ash (FABA), komposisi jenis, luasan tutupan, teritip
Subjects:	Q Science Q Science > QH Biology Q Science > QL Zoology > QL435.A3 Crustacea
Divisions:	Faculty of Science and Data Analytics (SCIENTICS) > Biology > 46101-(S2) Master Thesis
Depositing User:	Mila Selvia
Date Deposited:	29 Jan 2026 01:11
Last Modified:	29 Jan 2026 01:11
URI:	http://repository.its.ac.id/id/eprint/131102

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