Coastal impacts of super typhoon Hagibis on Greater Tokyo and Shizuoka areas, Japan

Shimozono, Takenori; Tajima, Yoshimitsu; Kumagai, Kenzou; Arikawa, Taro; Oda, Yukinobu; Shigihara, Yoshinori; Mori, Nobuhito; Suzuki, Takayuki

doi:10.1080/21664250.2020.1744212

Cited by 34 publications

(16 citation statements)

References 17 publications

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“…Typhoon Haiyan (2013) resulted in 6300 deaths, 1061 missing and 28,689 injured in the Philippines (Lagmay et al 2015). Typhoon Hagibis (2019) caused at least 80 deaths, and affected 135,000 people (Tay et al 2020) and substantially damaged coastal infrastructure in Japan (Shimozono et al 2020). Therefore, it' is important to carry out quantitative assessment of the potential risk of TCinduced SS and flooding for densely populated cities and river deltas (Walsh et al 2016).…”

Section: Introductionmentioning

confidence: 99%

An integrated framework of coastal flood modelling under the failures of sea dikes: a case study in Shanghai

Yin

Bricker

et al. 2021

Nat Hazards

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Climate change leads to sea level rise worldwide, as well as increases in the intensity and frequency of tropical cyclones (TCs). Storm surge induced by TC’s, together with spring tides, threatens to cause failure of flood defenses, resulting in massive flooding in low-lying coastal areas. However, limited research has been done on the combined effects of the increasing intensity of TCs and sea level rise on the characteristics of coastal flooding due to the failure of sea dikes. This paper investigates the spatial variation of coastal flooding due to the failure of sea dikes subject to past and future TC climatology and sea level rise, via a case study of a low-lying deltaic city- Shanghai, China. Using a hydrodynamic model and a spectral wave model, storm tide and wave parameters were calculated as input for an empirical model of overtopping discharge rate. The results show that the change of storm climatology together with relative sea level rise (RSLR) largely exacerbates the coastal hazard for Shanghai in the future, in which RSLR is likely to have a larger effect than the TC climatology change on future coastal flooding in Shanghai. In addition, the coastal flood hazard will increase to a large extent in terms of the flood water volume for each corresponding given return period. The approach developed in this paper can also be utilized to investigate future flood risk for other low-lying coastal regions.

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Section: Introductionmentioning

confidence: 99%

An integrated framework of coastal flood modelling under the failures of sea dikes: a case study in Shanghai

Yin

Bricker

et al. 2021

Nat Hazards

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“…For instance, the Izu Peninsula received 750 mm of rain, central Tokyo got 392.5 mm, Hakone area was 940 mm, and the Marumori area was nearly 600 mm within 24 h. The heavy rain resulted in at least 1900 landslides and 135 breaches of river embankment points across 71 rivers in Japan. Typhoon Hagibis also created an extreme storm surge level that caused significant damage to the coastal structures along with the Greater Tokyo and Shizuoka areas, as reported by Shimozono et al (2020) [3].…”

Section: Introductionmentioning

confidence: 84%

Mechanisms of Flood-Induced Levee Breaching in Marumori Town during the 2019 Hagibis Typhoon

Tinh

Tanaka

Abe

et al. 2021

Water

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Typhoon Hagibis, which occurred at the beginning of October 2019, was one of the largest and most powerful tropical cyclones and was considered to be the most devastating typhoon to hit Japan in recorded history. Extreme heavy rainfall caused massive impacts to Japan in general and to Marumori Town, Miyagi Prefecture in particular. In the present study, the detailed flood characteristics at Marumori Town were investigated by using field observation and numerical simulations. The obtained data immediately after the flood has clearly shown that most levee breaches were caused by the water overflow on the river embankment at the constriction areas such as the tributaries’ junction and the intersection of the river embankment. Numerical simulations were performed to investigate the mechanism of levee breaching in Marumori Town. According to the simulation results, the flooding water from the upstream levee breach locations flowed into the paddy field area and caused the levee to breach at the river embankment interaction in the downstream area. A new levee breach criterion in terms of overflow depth and its duration on the river embankment was proposed. In addition, a sensitivity analysis was also performed to understand the effect of the backwater and phase lag of water level rise between the mainstream and tributaries. Although there have been many studies on flood disasters, the typhoon’s flood-induced disasters on the river and coastal infrastructures have still remained a big challenge. The present study outcomes provide useful information not only to understand how the river embankment of tributaries is vulnerable to water level rise, but also to support the river authorities to prepare better mitigation plans for future flood disasters.

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“…The volume of erosion averaged per month was mostly 10–40 m 3 , but in some periods (II, X, and XIII) the detected changes were low around 3–5 m 3 per month, whereas in periods XI and XIV nearly 70–80 m 3 of changes were observed. In the period XIV, there was a severe storm by Typhoon Faxai (hitting the area on 9 September 2020) and this likely affected the high-wave attacks and significant erosion [ 47 ]. Although every summer there have been some effects of typhoon passing nearby areas ( Table 1 ), Typhoon Faxai was the strongest and most disastrous in the study area [ 48 ].…”

Section: Discussionmentioning

confidence: 99%

Volumetric Change Detection in Bedrock Coastal Cliffs Using Terrestrial Laser Scanning and UAS-Based SfM

Hayakawa

Obanawa

2020

Sensors

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Three-dimensional (3D) morphological changes in rocky coasts need to be precisely measured for protecting coastal areas and evaluating the associated sediment dynamics, although volumetric measurements of bedrock erosion in rocky coasts have been limited due to the lack of appropriate measurement methods. Here we carried out repeat surveys of the 3D measurements of a small coastal island using terrestrial laser scanning (TLS) and structure-from-motion (SfM) photogrammetry with an unmanned aerial system (UAS) for 5 years. The UAS-SfM approach measures the entire shape of the island, whereas the TLS measurement enables to obtain more accurate morphological data at a scale of centimeters on the land side. The multitemporal TLS-derived data were first aligned in timeline by the iterative closest point (ICP) method and they were used as positionally correct references. The UAS-SfM data were then aligned to each of the TLS-derived data by ICP to improve its positional accuracy. The changed areas for each period was then extracted from the aligned UAS-derived point clouds and were converted to 3D mesh polygons, enabling a differential volume estimate (DVE). The DVE for each period was revealed to be from 3.1 to 77.2 m3/month. These changes are rapid enough to force the coastal bedrock island to disappear in 30 years. The temporal variations in the DVE is roughly associated with those in the frequency of high tidal waves.

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Coastal impacts of super typhoon Hagibis on Greater Tokyo and Shizuoka areas, Japan

Cited by 34 publications

References 17 publications

An integrated framework of coastal flood modelling under the failures of sea dikes: a case study in Shanghai

An integrated framework of coastal flood modelling under the failures of sea dikes: a case study in Shanghai

Mechanisms of Flood-Induced Levee Breaching in Marumori Town during the 2019 Hagibis Typhoon

Volumetric Change Detection in Bedrock Coastal Cliffs Using Terrestrial Laser Scanning and UAS-Based SfM

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