Analisis Waktu Pemulihan Total Suspended Sediment (TSS) Pasca-Bencana di Pesisir Timur Aceh Berbasis Citra Sentinel-3

Riyatna, Rifki Ade (2026) Analisis Waktu Pemulihan Total Suspended Sediment (TSS) Pasca-Bencana di Pesisir Timur Aceh Berbasis Citra Sentinel-3. Masters thesis, Institute Technology of Sepuluh Nopember.

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Abstract

Bencana hidrometeorologi ekstrem pada akhir tahun 2025 di daratan Aceh memicu pelepasan material terestrial secara masif ke perairan Selat Malaka, menghasilkan perluasan anomali konsentrasi Total Suspended Sediment (TSS) atau river plume yang berpotensi memberikan tekanan ekologis fisik akut (atenuasi cahaya dan smothering) pada ekosistem terumbu karang tepi di Pesisir Timur Aceh. Penelitian ini menganalisis waktu pemulihan konsentrasi TSS pasca-bencana menggunakan data spasio-temporal Sentinel-3 Ocean and Land Colour Instrument (OLCI) yang diekstraksi dengan algoritma
Neural Network Case-2 Regional CoastColour (C2RCC), serta memvalidasi konsistensi spasialnya menggunakan citra Sentinel-2 MSI resolusi tinggi pada tiga tapak waktu representatif. Hasil penelitian menunjukkan luasan area kritis TSS (> 20 mg/L) mencapai puncak sebesar 1.946 km² pada November 2025, dengan waktu pemulihan (recovery time) yang dibutuhkan hingga kembali ke kondisi baseline pra-bencana selama kurang lebih 5 (lima) bulan, yakni pada periode April–Mei 2026. Integrasi luasan TSS kritis dengan batas tujuh zona konservasi resmi mengidentifikasi Zona 1 dan Zona 2 sebagai zona Kritis Akut (paparan >40% selama lebih dari empat bulan), Zona 3 dan Zona 4 sebagai zona Terdampak Transisional, serta Zona 5–7 sebagai zona Resilien. Validasi silang terhadap Sentinel-2 pada tiga tapak waktu menunjukkan kesesuaian nilai TSS antar-sensor yang bervariasi (R² = 0,44–0,62), sementara analisis tambahan menggunakan citra satelit Sentinel-2 di dalam Zona Konservasi 2 mengonfirmasi gradien darat-ke-laut yang kuat dan signifikan secara statistik (Pearson r = −0,827; p < 0,001) antara konsentrasi TSS dan jarak ke pantai. Hasil ini memperkuat tingkat kepercayaan spasial terhadap klaim waktu pemulihan yang dihasilkan, serta menegaskan bahwa ekosistem bentik di perairan dangkal Selat Malaka mengalami paparan sedimen tersuspensi kronis dalam durasi yang cukup panjang. Informasi kuantitatif ini krusial sebagai data dasar bagi pemangku kepentingan dalam menentukan prioritas mitigasi dan pemulihan ekosistem pesisir, dengan Zona 1 dan Zona 2 sebagai prioritas utama intervensi.
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Extreme hydrometeorological disasters at the end of 2025 in mainland Aceh triggered a massive terrestrial runoff into the Malacca Strait, generating a widespread anomaly of Total Suspended Sediment (TSS) concentration (river plume) that potentially exerts acute physical stress (light attenuation and polyp smothering) on the fringing coral reef ecosystems along the East Coast of Aceh. This study analyzed the post-disaster TSS recovery time using spatio-temporal Sentinel-3 Ocean and Land Colour Instrument (OLCI) data extracted with the Neural Network-based Case-2 Regional CoastColour (C2RCC) algorithm, and validated its spatial consistency using higher-resolution Sentinel-2 MSI imagery at three representative time points. The results show that the critical TSS area extent (>20 mg/L) peaked at 1,946 km² in November 2025, with a recovery time of approximately five months required to return to the pre-disaster baseline condition, occurring in the April–May 2026 period. Integration of the critical TSS extent with the boundaries of seven official conservation zones identified Zone 1 and Zone 2 as Acutely Critical zones (exposure exceeding 40% for more than four months), Zone 3 and Zone 4 as Transitionally Affected zones, and Zones 5–7 as Resilient zones. Cross-sensor validation against Sentinel-2 across three time points showed variable agreement in TSS values (R² = 0.44–0.62), while a supplementary TSS analysis from Sentinel-3 imagery within Conservation Zone 2 confirmed a strong and statistically significant land-to-sea gradient (Pearson r = −0.827; p < 0.001) between TSS concentration and distance to shore. These findings strengthen the spatial confidence of the derived recovery-time estimate and confirm that benthic ecosystems in the shallow waters of the Malacca Strait experienced chronic, prolonged exposure to suspended sediment. This quantitative information is crucial as baseline data for stakeholders in prioritizing mitigation and coastal ecosystem recovery efforts, with Zone 1 and Zone 2 identified as the primary intervention priorities.

Item Type:	Thesis (Masters)
Subjects:	G Geography. Anthropology. Recreation > GC Oceanography > GC101.2 Seawater--Analysis
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Geomatics Engineering > 29101-(S2) Master Thesis
Depositing User:	Rifki Ade Riyatna
Date Deposited:	30 Jul 2026 06:09
Last Modified:	30 Jul 2026 06:09
URI:	http://repository.its.ac.id/id/eprint/139564

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