Penilaian Variabilitas Hydrological Loading Menggunakan Metode Gnss: Studi Terhadap Terestrial Water Storage

Agustawijaya, Ausa Ramadhan (2024) Penilaian Variabilitas Hydrological Loading Menggunakan Metode Gnss: Studi Terhadap Terestrial Water Storage. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Perubahan iklim global telah membawa dampak signifikan terhadap ketersediaan air di berbagai wilayah termasuk Indonesia. Penelitian ini memanfaatkan data GNSS CORS (Continues Operating Station) untuk mengukur perubahan vertikal yang terjadi pada permukaan tanah akibat pola hidrologi musiman. Pengolahan data GNSS dengan kerangka acuan ITRF2014 untuk memastikan akurasi dan konsistensi. Penggunaan GNSS dalam studi hidrologi memungkinkan analisis displacements pada permukaan secara vertikal yang diintegrasikan dengan observasi satelit Gravity Recovey and Climate Experiment (GRACE), dapat mengestimasi perubahan Total Water Storage (TWS), serta penggunaan data curah hujan GLDAS NOAH untuk membantu korelasi yang terjadi. Di Kalimantan, pergerakan vertikal stabil dan dengan variasi terjadi di daerah pesisir akibat pasang surut. Di Jawa, deformasi signifikan terjadi di utara akibat pengambilan air tanah dan aktivitas tektonik lokal. Curah hujan stabil di sisi utara dan timur Kalimantan didukung oleh nilai TWS, sedangkan di Jawa nilai TWS tinggi terjadi dekat DAS, sesuai dengan pergerakan vertikal GNSS. Korelasi antara GNSS, curah hujan, dan TWSA mendukung adanya hydrological loading musiman. Di Kalimantan, jumlah stasiun dengan data temporal panjang lebih sedikit sehingga korelasi GNSS dan TWSA rendah, tetapi stasiun seperti CRAU menunjukkan korelasi -0.5083, menunjukkan subsidence saat TWSA tinggi.
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Global climate change has significantly impacted water availability in many regions, including Indonesia. This research utilizes GNSS CORS (Continuous Operating Reference Station) data to measure vertical land surface changes due to seasonal hydrological patterns. GNSS data are processed with the ITRF2014 reference frame to ensure accuracy and consistency. The integration of GNSS in hydrological studies enables the analysis of vertical displacements, combined with Gravity Recovery and Climate Experiment (GRACE) satellite observations, to estimate changes in Terrestrial Water Storage (TWS). Additionally, GLDAS NOAH rainfall data are used to analyze and correlate these changes. In Kalimantan, vertical movements are generally stable but variable in coastal areas due to tidal effects. In Java, significant deformation occurs in the northern region due to extensive groundwater extraction and local tectonic activity. Stable precipitation on the northern and eastern sides of Kalimantan is corroborated by Terrestrial Water Storage (TWS) values, while in Java, high TWS values are observed near watersheds, correlating with vertical GNSS movements. The correlation between GNSS, precipitation, and TWSA substantiates the presence of seasonal hydrological loading. In Kalimantan, fewer stations have long-term temporal data, resulting in lower correlations between GNSS and TWSA. However, stations such as CRAU located on east north exhibit a correlation of -0.5083, indicating subsidence occurs during periods of high TWS.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	GNSS, Hydrologic Loading, Total Water Storage, Time Series.
Subjects:	G Geography. Anthropology. Recreation > G Geography (General) > G109.5 Global Positioning System 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, Environmental, and Geo Engineering > Geomatics Engineering > 29101-(S2) Master Theses
Depositing User:	Ausa Ramadhan Agustawijaya
Date Deposited:	31 Jul 2024 05:47
Last Modified:	31 Jul 2024 05:47
URI:	http://repository.its.ac.id/id/eprint/110053

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