Kajian Pola Sebaran Genangan terhadap Variasi Durasi dan Intensitas Hujan di Kampus ITS Sukolilo, Surabaya

Kusnadi, Maya Felicia (2026) Kajian Pola Sebaran Genangan terhadap Variasi Durasi dan Intensitas Hujan di Kampus ITS Sukolilo, Surabaya. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Sistem drainase perkotaan berfungsi mengalirkan kelebihan air agar tidak menimbulkan genangan. Di Kota Surabaya sistem ini sudah tertata, tetapi genangan masih muncul di sejumlah lokasi walaupun infrastrukturnya telah ditingkatkan. Karena itu, sebaran genangan yang terbentuk pada tiap kejadian hujan perlu ditinjau menurut variasi durasi dan intensitasnya. Penelitian ini bertujuan mengidentifikasi pola hujan yang sering terjadi dan yang di Surabaya, mengetahui respons spasial kawasan Kampus ITS Sukolilo terhadap variasi pola hujan tersebut, dan merumuskan hubungan antara total curah hujan dengan luas genangan yang terbentuk. Data hujan per menit dari 10 pos ARR periode akhir 2023 sampai awal 2026 diolah menjadi data per jam. Hasilnya berupa 3.581 kejadian hujan, yang dikelompokkan menjadi 58 pola representatif berdasarkan kelompok data, kelas total hujan, dan durasi. Bentuk pola hujan riil dibandingkan dengan tujuh hietograf rencana, yaitu Mononobe, Huff Kuartil I sampai IV, SCS Type II, dan ABM, memakai indikator NSE, RMSE, dan MAE. Ke-58 pola tersebut disimulasikan dengan model HEC-RAS 2D rain on grid. Geometri model disusun dari terrain gabungan DTM dan DSM hasil pemetaan lidar drone serta peta tutupan lahan kawasan seluas 176,06 ha. Hujan di Surabaya berlangsung singkat, dengan durasi paling lama 4 jam. Huff Kuartil I paling mendekati bentuk pola hujan riil pada seluruh kelompok data, disusul Mononobe. Luas genangan hasil simulasi berkisar 4,78 ha sampai 61,76 ha. Hubungan luas genangan dengan total hujan paling baik dijelaskan model Power, yaitu Luas = 4,8214 × Total^0,5114 dengan R² = 0,9509.
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Urban drainage systems carry excess water away so that inundation does not occur. In Surabaya the system is already well developed, yet inundation still appears at several locations even after infrastructure improvements. The extent of inundation produced by each rainfall event therefore needs to be examined against variations in duration and intensity. This research identifies the rainfall patterns that occur most often in Surabaya, examines the spatial response of the ITS Sukolilo campus area to these variations, and formulates the relationship between total rainfall and the resulting inundation area. Minute interval rainfall data from ten ARR stations recorded between late 2023 and early 2026 were converted into hourly data. This produced 3,581 rainfall events, which were grouped into 58 representative patterns by data group, total rainfall class, and duration. The observed rainfall patterns were compared with seven design hyetographs, namely Mononobe, Huff Quartiles I to IV, SCS Type II, and ABM, using NSE, RMSE, and MAE. The 58 patterns were then simulated with a HEC-RAS 2D rain on grid model. The model geometry was built from a combined DTM and DSM terrain obtained by drone lidar mapping together with a land cover map covering 176.06 ha. Rainfall in Surabaya is short, lasting no more than four hours. Huff Quartile I is the closest match to the observed rainfall shape in every data group, followed by Mononobe. Simulated inundation areas range from 4.78 ha to 61.76 ha. The relationship between inundation area and total rainfall is best described by a power model, Area = 4.8214 × Total^0.5114 with R² = 0.9509.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Kata kunci: pola sebaran genangan, respons spasial, durasi dan intensitas hujan, HEC-RAS 2D rain on grid, hietograf rencana, Kampus ITS Sukolilo, Surabaya Keywords: inundation distribution pattern, spatial response, rainfall duration and intensity, HEC-RAS 2D rain on grid, design hyetograph, ITS Sukolilo Campus, Surabaya
Subjects:	G Geography. Anthropology. Recreation > GB Physical geography > GB1399.2 Flood forecasting. G Geography. Anthropology. Recreation > GB Physical geography > GB1399.9 Floods Q Science > QC Physics > QC925 Rain and rainfall S Agriculture > S Agriculture (General) > S600.7.R35 Rain and rainfall
Divisions:	Faculty of Vocational > 22301-Civil Infrastructure Engineering (D4)
Depositing User:	Maya Felicia Kusnadi
Date Deposited:	07 Aug 2026 07:47
Last Modified:	07 Aug 2026 07:47
URI:	http://repository.its.ac.id/id/eprint/144215

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