Inundation Forecasting on National Scale of Japan Using Rainfall-Runoff-Inundation Integral Analysis

Konja, Atsuhiko; SEKIMOTO, Taisei; Abe, Sumiyoshi; Iwasaki, Takashi; Cui, Guoqing; Kojima, Hironari; Nakamura, Yosuke; Sayama, Takahiro

doi:10.2208/jscejhe.75.2_i_1321

Cited by 6 publications

(3 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The default land use was classified into 12 types. However, to facilitate calibration of the parameters, we consolidated them into five types during the calculation as follows: rice paddy, farmland, mountain, urban, and water area (Konja et al, 2019). The computational period was 4 days, with 3 days allocated for HTM analysis and an additional day for spin-up computation to establish the initial presence of water within the river channel.…”

Section: Rainfall-runoff-inundation Modelmentioning

confidence: 99%

Investigation of compound occurrence of storm surge and river flood in Mikawa Bay, Japan, using typhoon track ensemble experiments

Haruyama,

Toyoda,

Kato

et al. 2024

Front. Water

View full text Add to dashboard Cite

The risk of high river flow and peak storm surge superimposing in the estuary of small-and medium-sized rivers can be more severe during typhoon landfalls than at other times. In this study, 30 cases of typhoon track ensemble experiments for five rivers in Mikawa Bay, Japan, were evaluated using an atmospheric-river-ocean model. The results showed that storm surges coincided with high river flows when typhoons crossed the western side of Mikawa Bay, with the highest potential observed when typhoons passed northwest of the Bay. The average time discrepancy for the five rivers between the storm surge occurrence and increased river flow in the minimum time difference case was 48 min at the river mouth. Distinct trends in the time difference between a storm surge and river flow were observed for each river mouth. The order of time differences corresponded to the drainage area scale: Toyo (188 min), Umeda (112 min), Otowa (114 min), Sana (96 min), and Yagyu (88 min). Time difference trends also varied based on the distance between the typhoon center and each river mouth. For Toyo River, storm surges and high river flows did not substantially overlap, regardless of distance. However, for medium-and small-sized rivers, the time difference increased proportionally with the distance from the typhoon. The Yagyu River showed the highest potential for compound occurrence of a storm surge and river flood because of the synchronization of storm surge peaks and high river flow peaks, with a time difference of 1–2 h for small-and medium-sized rivers within 100 km2 of the basin.

show abstract

Section: Rainfall-runoff-inundation Modelmentioning

confidence: 99%

Investigation of compound occurrence of storm surge and river flood in Mikawa Bay, Japan, using typhoon track ensemble experiments

Haruyama,

Toyoda,

Kato

et al. 2024

Front. Water

View full text Add to dashboard Cite

show abstract

“…The default land use is classi ed into 12 types. However, in order to facilitate the calibration of the parameters, we consolidated them into the ve types during the calculation: rice paddy, farmland, mountain, urban, and water area (Konja et al 2019).…”

Section: Computational Con Guration For Rainfall-runoffmentioning

confidence: 99%

Assessment of Compound Flooding Risk in Ise and Mikawa Bays, Japan Using a Framework of Atmosphere-Ocean-River Coupling

Toyoda

Mori

Kim

et al. 2022

Preprint

View full text Add to dashboard Cite

The present study evaluated the compound flood risk of 11 different-sized rivers in the estuaries of the Ise and Mikawa Bays, Japan, using an integrated framework of atmosphere-ocean-river developed in this study. First, the framework was developed by incorporating the river channel into a coupled model of surge-wave-tide to include the interaction of the storm surge runup and river flow. In addition, the framework was validated by the Typhoon Trami (2018)-induced meteorological field, discharge, and storm surge with high accuracy. Then, the time difference between the storm surge and discharge at the estuary (TDSD) was investigated assuming six typhoons with different tracks and similar distributions of intensity and precipitation using Typhoon Hagibis (2019) as a case study. It was found that the TDSD reveals a high positive correlation with the length of the river channel (correlation coefficient: 0.90). Also, the smaller rivers were more prone to simultaneous storm surge and high river flow. The river with the smallest TDSD average in 6 cases of sensitivity experiments was 70 minutes, and it was clarified that the storm surge and high river flow occur simultaneously (within 15 min) in the most severe case (the smallest TDSD case). As a result, it was found that the small- and medium-sized river with a standard deviation of 49.5 minutes has a small TDSD regardless of the typhoon track, resulting in a higher risk of compound flood in comparison to the large-scale rivers with that of 102 minutes.

show abstract

“…These studies used a combined model with a distributed runoff model, a 1-D unsteady flow model, and particle filters 6) . The Rainfall-Runoff-Inundation (RRI) model 7) has also been used to predict inundation over the whole of Japan 8) . The RRI and iRIC's Nays2DH models were used to reproduce flood inundation flows in the Kuma River basin 9) .…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Characteristics of Flood Flows in the Chikugo River System Based on Water-Level Information During the Heavy Rainfall in July 2020

et al. 2022

View full text Add to dashboard Cite

The heavy rainfall in July 2020 caused extensive damage to the Chikugo River system. In this study, we summarized the rainfall and damage in the system. We also conducted a one-dimensional flood flow analysis based on observed water levels. The analysis covered the Chikugo, Kusu, Kuma, Shode, and Kagetsu Rivers in the upper Chikugo River basin, which were inundated by river water. The results showed the following: (1) The amount of heavy rainfall was almost the same as the design magnitude. (2) In the Chikugo River basin, inundation by river water and inundation inside a levee occurred, and road and railroad bridges were washed away. (3) The flow rate and water level at Senjo, Ogase, Kobuchi, Kuma, Kagetsu, and Arase stations were estimated. The water levels of the Chikugo, Shode, and Kusu Rivers rose to or exceeded the design high-water level. The flow rate in the sections where the water level rose to the design high-water level was at or above the flow rate specified in the river improvement plan.

show abstract

Inundation Forecasting on National Scale of Japan Using Rainfall-Runoff-Inundation Integral Analysis

Cited by 6 publications

References 1 publication

Investigation of compound occurrence of storm surge and river flood in Mikawa Bay, Japan, using typhoon track ensemble experiments

Investigation of compound occurrence of storm surge and river flood in Mikawa Bay, Japan, using typhoon track ensemble experiments

Assessment of Compound Flooding Risk in Ise and Mikawa Bays, Japan Using a Framework of Atmosphere-Ocean-River Coupling

Investigation of the Characteristics of Flood Flows in the Chikugo River System Based on Water-Level Information During the Heavy Rainfall in July 2020

Contact Info

Product

Resources

About