The Tidal Flood Inundation Modeling Using Spatial Analysis On The Northern Coast of Gresik Regency

Wiryawan, Andrew Egbert (2023) The Tidal Flood Inundation Modeling Using Spatial Analysis On The Northern Coast of Gresik Regency. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Low-lying coastal regions are vulnerable to natural disasters, such as coastal flooding, due to sea level rise (SLR). Tidal flooding occurs when storms and the year's highest tide (spring tide) coincide. Land deformation, which causes vertical land movement, can also worsen coastal flooding by lead elevation change. These phenomena caused coastline changes due to an SLR increase in the coastal areas of Gresik. Gresik Regency is located in the northern part of Java Island, Indonesia, experiencing vertical land movement and coastal abrasion. The area experienced two instances of tidal flooding in the middle of 2022. Therefore, it is important to create a tidal flood model to map the distribution of potential flood inundation, which can be used for disaster mitigation in the future. The tidal flood models were created based on eight scenarios by entering parameters of sea level rise and vertical movement of land using a general Bathtub Model (BTM) or raster calculator and an “enhanced Bathtub Model” (eBTM). The distribution of potential flood inundation is located in 4 sub-districts such as Ujungpangkah, Panceng, Bungah, and Sidayu sub-districts which are spread up to 35 villages, and around 14 villages remain potentially inundated using all model scenarios. The widest flood inundation area is found in Scenario 2, reaching 8384.595 ha, where Scenario 3 resulted in the narrowest area with 3952.877 ha. Ujungpangkah sub-district is the most extensive potential inundated sub-district, and the Panceng sub-district has the least potential area. The tidal flood inundation modelling using DEM with different spatial resolutions will significantly affect the results. Overall, modelling the potential for tidal flood inundation with general BTM has more expansive inundation results when compared to the enhanced BTM output model.
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Daerah pesisir rentan terhadap bencana alam, seperti banjir pesisir akibat kenaikan tinggi muka laut (TML). Banjir pasang surut dapat terjadi ketika badai dan pasang tertinggi saling bertepatan. Deformasi menyebabkan gerakan tanah vertikal dapat memperburuk kondisi banjir pesisir dengan perubahan elevasi topografi. Fenomena tersebut juga menyebabkan perubahan garis pantai di wilayah pesisir Gresik. Kabupaten Gresik terletak di bagian utara Pulau Jawa telah mengalami pergerakan tanah vertikal dan abrasi pantai. Daerah tersebut mengalami dua kejadian banjir rob pada pertengahan tahun 2022. Oleh karena itu, penting untuk membuat model banjir rob untuk memetakan sebaran potensi genangan banjir yang dapat digunakan untuk mitigasi bencana di masa mendatang. Model banjir rob dibuat berdasarkan delapan skenario dengan memasukkan parameter kenaikan muka air laut dan pergerakan vertikal tanah menggunakan general “Bathtub” Model (BTM) dan Enhance Bathtub Model (eBTM). Sebaran potensi genangan banjir terletak di 4 kecamatan yaitu Kecamatan Ujungpangkah, Panceng, Bungah, dan Sidayu yang tersebar hingga di 35 desa. Sekitar 14 desa tetap berpotensi tergenang menggunakan semua model skenario. Daerah potensi genangan banjir terluas terdapat pada Skenario 2 yaitu mencapai 8384.595 ha, dimana Skenario 3 menghasilkan daerah tersempit seluas 3952.877 ha. Kecamatan Ujungpangkah memiliki potensi tergenang paling luas, dan Kecamatan Panceng memiliki luasan paling sedikit. Pemodelan genangan banjir rob menggunakan DEM dengan resolusi spasial yang berbeda akan mempengaruhi hasil secara signifikan. Secara keseluruhan, pemodelan potensi genangan banjir rob dengan BTM memiliki hasil genangan yang lebih luas jika dibandingkan dengan luaran eBTM.

Item Type:	Thesis (Other)
Additional Information:	RSG 006.693 Wir t-1 2023
Uncontrolled Keywords:	Coastal, Tidal Flood, Sea Level Rise, Land Deformation, Bathtub Model, Pesisir, Banjir Pasang, Tinggi Muka Laut, Deformasi Lahan, Model Bathtub
Subjects:	G Geography. Anthropology. Recreation > GB Physical geography > GB1399.9 Floods G Geography. Anthropology. Recreation > GE Environmental Sciences Q Science > QE Geology > QE598 Land subsidence
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Geomatics Engineering > 29202-(S1) Undergraduate Thesis
Depositing User:	Andrew Egbert Wiryawan
Date Deposited:	24 Aug 2023 06:31
Last Modified:	21 Dec 2023 04:13
URI:	http://repository.its.ac.id/id/eprint/100221

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