Dinamika Surface Deformation Dan Groundwater Storage di Jawa Timur: Analisis Terintegrasi Berbasis InSAR Dan Data Satelit GRACE-FO

Raihan, Naufal Awaly (2026) Dinamika Surface Deformation Dan Groundwater Storage di Jawa Timur: Analisis Terintegrasi Berbasis InSAR Dan Data Satelit GRACE-FO. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Provinsi Jawa Timur mengalami pertumbuhan kawasan perkotaan dan aktivitas ekonomi, terutama di wilayah pesisir, yang meningkatkan kebutuhan air dan tekanan terhadap pemanfaatan lahan serta sumber daya air. Keragaman geologi, hidrogeologi, penggunaan lahan, dan pemanfaatan air tanah berpotensi menimbulkan variasi surface deformation dan groundwater storage antarwilayah. Penelitian ini bertujuan mengkarakterisasi kedua fenomena tersebut dan mengevaluasi hubungan temporalnya selama 2019–2024. Surface deformation dianalisis menggunakan time-series InSAR Sentinel-1 berbasis LiCSBAS, sedangkan groundwater storage anomaly (GWSA) diestimasi dari terrestrial water storage anomaly GRACE-FO hasil downscaling setelah dikurangi komponen hidrologi GLDAS. Hubungan temporal dianalisis menggunakan Dynamic Time Warping (DTW) dan korelasi Pearson pada sepuluh area. Hasil InSAR menunjukkan LOS velocity sebesar hingga 58.14 mm/tahun di daratan Jawa Timur dan hingga 12.87 mm/tahun di Madura, dengan LOS subsidence lebih menonjol di wilayah utara, perkotaan, dan pesisir. GWSA menunjukkan pola heterogen dengan tren regional meningkat sebesar 0.67 cm/tahun. Analisis CHIRPS–GWSA menghasilkan similarity coefficient 0.78 dan mean lag 3.96 bulan, sedangkan analisis GWSA–InSAR menghasilkan similarity coefficient 0.66–0.81, average lag 0.75–4.09 bulan, dan korelasi Pearson hingga 0.03. Hasil tersebut menunjukkan kemiripan temporal tertunda, bukan hubungan linier langsung, sehingga interpretasinya perlu mempertimbangkan resolusi spasial, kondisi hidrogeologi, dan sumber surface deformation lokal lainnya.
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East Java Province has experienced urban expansion and increasing economic activity, particularly in coastal areas, which have increased water demand and pressure on land use and water resources. Variations in geology, hydrogeology, land use, and groundwater utilization may contribute to regional differences in surface deformation and groundwater storage. This study aims to characterize both phenomena and evaluate their temporal relationship during 2019–2024. Surface deformation was analyzed using Sentinel-1 time series InSAR based on LiCSBAS, whereas groundwater storage anomaly (GWSA) was estimated from downscaled GRACE-FO terrestrial water storage anomaly after subtracting the GLDAS hydrological components. The temporal relationship was analyzed using Dynamic Time Warping (DTW) and Pearson correlation across ten analysis areas. The InSAR results showed LOS velocities ranging from to 58.14 mm/year in mainland East Java and from to 12.87 mm/year in Madura, with LOS subsidence more pronounced in northern, urban, and coastal areas. GWSA showed heterogeneous patterns with a regional increasing trend of 0.67 cm/year. The CHIRPS–GWSA analysis produced a similarity coefficient of 0.78 and a mean lag of 3.96 months, whereas the GWSA–InSAR analysis produced similarity coefficients of 0.66–0.81, average lags of 0.75–4.09 months, and Pearson correlations ranging from to 0.03. These results indicate delayed temporal similarity rather than a direct linear relationship. Their interpretation should consider spatial resolution, hydrogeological conditions, and other local sources of surface deformation.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	Surface Deformation, Groundwater Storage, InSAR, GRACE-FO, GLDAS, Jawa Timur, LiCSBAS InSAR, East Java
Subjects:	G Geography. Anthropology. Recreation > G Geography (General) > G70.217 Geospatial data G Geography. Anthropology. Recreation > G Geography (General) > G70.5.I4 Remote sensing G Geography. Anthropology. Recreation > GB Physical geography > GB1003.2 Groundwater. G Geography. Anthropology. Recreation > GB Physical geography > GB651 Subsidences (Earth movements)
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Geomatics Engineering > 29101-(S2) Master Thesis
Depositing User:	Naufal Awaly Raihan
Date Deposited:	30 Jul 2026 04:50
Last Modified:	30 Jul 2026 04:50
URI:	http://repository.its.ac.id/id/eprint/139648

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