Dinamika Terrestrial Water Storage Pulau Jawa Berdasarkan Data GNSS Kontinu Selama Satu Dekade

Mukmin, Muchammad Faisal (2026) Dinamika Terrestrial Water Storage Pulau Jawa Berdasarkan Data GNSS Kontinu Selama Satu Dekade. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Distribusi dan redistribusi massa air di permukaan bumi menghasilkan perubahan beban yang memicu deformasi elastik kerak bumi. Deformasi tersebut terekam oleh instrumen geodetik sebagai hasil superposisi berbagai sumber pergerakan, baik yang berasal dari proses hidrologi, tektonik, maupun pergerakan antropogenik. Dalam penelitian ini, deformasi vertikal yang didapatkan dari jaringan GNSS kontinu direduksi menggunakan PCA Decomposition lalu diinversi menggunakan Green Function untuk merekonstruksi perubahan Equivalent Water Height (EWH) sebagai representasi pergerakan massa air daratan. Penelitian ini menggunakan data GNSS InaCORS selama periode 2012-2022 yang diolah PPP. Hasil penelitian menunjukkan bahwa sembilan komponen utama hasil PCA mampu menjelaskan 80,43% variasi total deformasi vertikal, dengan komponen utama pertama (PC1) berkontribusi sebesar 41,44% sebagai sinyal hidrologi regional yang dominan. Deformasi vertikal GNSS didominasi oleh komponen musiman tahunan dengan amplitudo sebesar 0,64–4,90 mm dan fase yang relatif seragam antarstasiun, sedangkan analisis spektral mengidentifikasi adanya periodisitas tahunan, antar-tahunan, dan periodisitas lokal. Hasil inversi berhasil merekonstruksi distribusi EWH yang mengikuti pola penyimpanan air musiman di Pulau Jawa dengan amplitudo tahunan berkisar 100–400 mm pada sebagian besar wilayah. Validasi terhadap GRACE/GRACE-FO, GLDAS-CLSM, GLDAS-SWC, dan data curah hujan menunjukkan kesesuaian pola temporal yang baik setelah mempertimbangkan perbedaan respons waktu antar dataset. Penelitian ini menunjukkan bahwa jaringan GNSS kontinu mampu merepresentasikan dinamika spasiotemporal Terrestrial Water Storage di Pulau Jawa lebih detail daripada menggunakan satelit gayaberat dan model hidrologi global
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The distribution and redistribution of water mass on the Earth’s surface result in changes in load that trigger elastic deformation of the Earth’s crust. This
deformation is recorded by geodetic instruments as the result of the superposition of various sources of movement, including those arising from hydrological and
tectonic processes, as well as anthropogenic activity. In this study, vertical deformation data obtained from a continuous GNSS network were reduced using PCA decomposition and then inverted using the Green’s function to reconstruct changes in Equivalent Water Height (EWH) as a representation of terrestrial water mass movement. This study utilized InaCORS GNSS data from the 2012–2022 period processed by PPP. The results show that the nine principal components from the PCA explain 80.43% of the total variation in vertical deformation, with the first principal component (PC1) contributing 41.44% as the dominant regional hydrological signal. GNSS vertical deformation is dominated by an annual seasonal component with an amplitude of 0.64–4.90 mm and a phase that is relatively uniform across stations, while spectral analysis identified annual, interannual, and local periodicities. The inversion results successfully reconstructed the EWH distribution, which follows the seasonal water storage pattern on the island of Java with an annual amplitude ranging from 100 to 400 mm across most of the region. Validation against GRACE/GRACE-FO, GLDAS-CLSM, GLDAS-SWC, and precipitation data showed good agreement in temporal patterns after accounting for differences in time response between datasets. This study demonstrates that a continuous GNSS network is capable of representing the spatiotemporal dynamics of Terrestrial Water Storage on Java in greater detail than using gravity satellites and global hydrological models.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	Terrestrial Water Storage, GNSS, GRACE, Green Function, Inversi, Terrestrial Water Storage, GNSS, GRACE, Green Function, Inversion
Subjects:	G Geography. Anthropology. Recreation > GB Physical geography > GB1003.2 Groundwater.
Divisions:	Faculty of Civil, Environmental, and Geo Engineering > Geomatics Engineering > 29101-(S2) Master Theses
Depositing User:	Muchammad Faisal Mukmin
Date Deposited:	29 Jul 2026 01:21
Last Modified:	29 Jul 2026 01:21
URI:	http://repository.its.ac.id/id/eprint/138795

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