Comparison of flood hydrograph prediction between synthetic unit hydrograph methods and rain-on-grid model for Katulampa watershed, Indonesia

Minola Ginting, Bobby (author), Lidyana, Prilla (author), Christopher, Cleon (author), Yudianto, Doddi (author), Yuebo, Xie (author)

In this paper, 6 synthetic unit hydrograph (SUH) methods, namely Snyder, SCS, GAMA-1, ITB-1, ITB-2, and Nakayasu, were compared against a rain-on-grid model (HEC-RAS) for flood hydrograph prediction in the Katulampa watershed, Indonesia. HEC-RAS was used with an open-access, ~30 m resolution digital elevation model (DEM), i.e. the Advanced Land Observing Satellite (ALOS). The relative error of the hydrograph results (peak discharge and time-to-peak) were compared with the observed data, while the errors in the hydrograph’s shape were detected using the Root Mean Square Error and Pearson Product Moment Correlation. We found that HEC-RAS could predict the flood hydrograph significantly more accurately than the SUH methods, yielding the value of 1.98 m3 /s and the value of 0.93. This study remains an interesting example of how modern computational tool can improve the runoff prediction of conventional SUH methods.

• Language: English
• Keywords: DEM, Katulampa, synthetic unit hydrograph, HEC-RAS, rain-on-grid
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FGG - Faculty of Civil and Geodetic Engineering
• Publication status: Published
• Publication version: Version of Record
• Year: 2023
• Number of pages: Str. 81-94
• Numbering: Vol. 36, no. 64
• PID: 20.500.12556/RUL-163424
• UDC: 004.9:556.166-047.48(594)
• ISSN on article: 0352-3551
• COBISS.SI-ID: 210442755
• Publication date in RUL: 07.10.2024

Record is a part of a journal

• Title: Acta hydrotechnica
• Publisher: Fakulteta za gradbeništvo in geodezijo
• ISSN: 0352-3551
• COBISS.SI-ID: 3664386

Licences

• License: CC BY-NC-SA 4.0, Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International
• Link: http://creativecommons.org/licenses/by-nc-sa/4.0/
• Description: A Creative Commons license that bans commercial use and requires the user to release any modified works under this license.

Secondary language

• Language: Slovenian
• Title: Primerjava napovedi poplavnega hidrograma med metodami sintetičnega hidrograma enote in modelom mrežnih padavin za povodje Katulampa, Indonezija

Abstract

V tem prispevku smo primerjali šest metod sintetičnih hidrogramov enote (SUH), tj. Snyder, SCS, GAMA-1, ITB-1, ITB-2 in Nakayasu, z modelom mrežnih padavin (HEC-RAS) za napoved poplavnega hidrograma v povodju Katulampa v Indoneziji. HEC-RAS je bil uporabljen z odprtodostopnim digitalnim modelom višine (DEM) z ločljivostjo ~30 m, tj. Advanced Land Observing Satellite (ALOS). Relativno napako rezultatov hidrograma (najvišji pretok in čas do vrha) smo primerjali z opazovanimi podatki, medtem ko smo napake v obliki hidrograma opazovali z uporabo korena povprečne kvadratne napake (RMSE) in Pearsonove korelacije produkta momentov (PPMC). Ugotovili smo, da lahko HEC-RAS napoveduje poplavni hidrogram bistveno natančneje kot metode SUH, saj poda vrednost RMSE 1,98 m3/s in vrednost PPMC 0,93. Ta raziskava dobro ponazarja, kako lahko sodobno računalniško orodje izboljša napoved odtoka z uporabo običajnih metod SUH.

• Keywords: DEM, Katulampa, sintetični hidrogram enote, HEC-RAS, mrežne padavine

Projects

• Funder: Other - Other funder or multiple funders
• Funding programme: Institute for Research and Community Service (Lembaga Penelitian dan Pengabdian kepada Masyarakat) of Parahyangan Catholic University
• Project number: III/LPPM/2023-02/35-P

• Funder: Other - Other funder or multiple funders
• Funding programme: y Ikatan Alumni Teknik Sipil (IATS) of Parahyangan Catholic University
• Project number: 006/IATS-UNPAR/V/2020