Simulation of large freshwater behavior in Hakata Bay due to torrential rain using nested two-dimensional model

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In this study, a numerical simulation consisting of a two-dimensional model of Hakata Bay, Kyushu Island. Japan, was conducted to analyze the impact oflarge river discharges due to torrential rain. Since Fukuoka city, one of the largest cities in Japan, surrounds Hakata Bay, the bay has a very complex environment, including an artificial island (Island City) in its eastern region and small bay (Imazu Bay) where tideland is spread with rich ecosystems in its western region. Tank models were applied to calculate the discharges of the 38 rivers that flow into Hakata Bay, and a two-way nesting technique, "edge nesting," was developed and applied in the model to capture the influence of complex geographical features, such as the Island City area and the Imazu Bay area, which were nested with a high-resolution mesh. The model accurately reproduced the observed tidal current and salinity data. To simulate the behavior oflarge river discharges, a historical simulation period including a torrential rain event (163.5 mm/d) was input into the model. The results showed that after the rain event, low-salinity water covered the entire inner part of Hakata Bay, and freshwater covered the entire area of the tidal flats and flowed out from the mouth of Imazu Bay. The behavior of this large mass of fresh water was remarkably different from usual discharge river flow. These results indicate that the environment in the bay can be significantly changed by torrential rain events.

Original languageEnglish
Title of host publicationProceedings - International Association for Hydro-Environment Engineering and Research (IAHR)-Asia Pacific Division (APD) Congress
Subtitle of host publicationMulti-Perspective Water for Sustainable Development, IAHR-APD 2018
EditorsMuhammad Ramdhan Olii, Djoko Legono, Ani Hairani, Benazir, Warniyati Warniyati, Hendy Setiawan, Roby Hambali, Johan Syafri Mahathir Ahmad, Karlina
PublisherDepartment of Civil and Environmental Engineering, Faculty of Engineering, Universitas Gadjah Mada
Pages521-529
Number of pages9
ISBN (Electronic)9786027176270
Publication statusPublished - Sep 1 2018
Event21st Congress of International Association for Hydro-Environment Engineering and Research-Asia Pacific Division: Multi-Perspective Water for Sustainable Development, IAHR-APD 2018 - Yogyakarta, Indonesia
Duration: Sep 2 2018Sep 5 2018

Publication series

NameProceedings - International Association for Hydro-Environment Engineering and Research (IAHR)-Asia Pacific Division (APD) Congress: Multi-Perspective Water for Sustainable Development, IAHR-APD 2018
Volume1

Conference

Conference21st Congress of International Association for Hydro-Environment Engineering and Research-Asia Pacific Division: Multi-Perspective Water for Sustainable Development, IAHR-APD 2018
CountryIndonesia
CityYogyakarta
Period9/2/189/5/18

All Science Journal Classification (ASJC) codes

  • Ecology
  • Environmental Engineering

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  • Cite this

    Fukuda, A., Tabata, T., Honda, Y., Hiramatsu, K., & Masayoshi, H. (2018). Simulation of large freshwater behavior in Hakata Bay due to torrential rain using nested two-dimensional model. In M. R. Olii, D. Legono, A. Hairani, Benazir, W. Warniyati, H. Setiawan, R. Hambali, J. S. M. Ahmad, & Karlina (Eds.), Proceedings - International Association for Hydro-Environment Engineering and Research (IAHR)-Asia Pacific Division (APD) Congress: Multi-Perspective Water for Sustainable Development, IAHR-APD 2018 (pp. 521-529). (Proceedings - International Association for Hydro-Environment Engineering and Research (IAHR)-Asia Pacific Division (APD) Congress: Multi-Perspective Water for Sustainable Development, IAHR-APD 2018; Vol. 1). Department of Civil and Environmental Engineering, Faculty of Engineering, Universitas Gadjah Mada.