Taro Arikawa

Taro Arikawa
Chuo University · Department of Civil and Environmental Engineering

Doctor of Engineering

About

220
Publications
31,663
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
1,222
Citations
Citations since 2016
136 Research Items
1025 Citations
2016201720182019202020212022050100150200
2016201720182019202020212022050100150200
2016201720182019202020212022050100150200
2016201720182019202020212022050100150200
Additional affiliations
April 2015 - present
April 2015 - present
Chuo University
Position
  • Professor
April 2000 - March 2015
Port and Airport Research Institute
Position
  • Senior Researcher

Publications

Publications (220)
Article
In this study, the trend of the protective effect of movable breakwaters, which are expected to have a certain protective effect against specific typhoons, and the aspect of damage caused by storm surges were evaluated through comparison with raised breakwaters by changing the characteristics of typhoons. The results showed that the method of raisi...
Article
In order to rationally consider inundation damage caused by low-frequency external forces such as tsunamis, it is important to consider inundation depths and other factors in a probabilistic manner. Arikawa et al. (2021) compared the tsunami inundation probabilities of two regions by applying the fragility method (Arikawa et al., 2017) for breakwat...
Article
In this study, we used machine learning to instantaneously predict the tsunami arrival time to town A in Mie Prefecture from water level data immediately after the occurrence of an earthquake, targeting the Nankai Trough earthquake. Prediction errors were compared between a model for each earthquake scale and a model using data for all earthquake s...
Article
In order to reduce human casualties from tsunamis, it is important to take soft measures in addition to hard measures. For safer evacuation, it is effective to consider the tsunami inundation area and the arrival-time of tsunamis. Therefore, the purpose of this study is to examine an influence of the tsunami arrival-time prediction error on the eva...
Article
The behavior of drifting debris at the time of a tsunami is subject to large uncertainties, and therefore it is common to use a random-motion model in numerical simulations for probabilistic evaluation. However, currently we do not have enough knowledge on the degree of variation in drifting behavior due to differences in the shape and specific wei...
Article
The tsunami attenuation effect of coastal vegetation such as mangroves as green infrastructure is widely known through field surveys of disasters. However, a detailed analysis of the vegetation in the form of prop roots requires small grid resolution and enormous computational resources. Since this analysis is difficult to perform at current numeri...
Article
To improve the accuracy of storm surge forecasting, it is desirable to improve the typhoon forecasting accuracy. The typhoon forecasting model WRF has a high degree of freedom in setting its calculation conditions. In this study, we conducted sensitivity analyses of the WRF’s calculation domain settings, initial and boundary conditions, and physics...
Article
On January 15, 2022, a large-scale eruption occurred at the submarine volcano Hunga Tonga-Hunga Ha'apai near the Tonga Islands, and sea-level changes were observed around the world. The sea level fluctuation is assumed to be caused by atmospheric-oceanic resonance due to the Lamb waves and atmospheric gravity waves associated with the eruption. How...
Article
Full-text available
Weather Research and Forecasting (WRF) model is useful for forecasting typhoons as an external force of storm surge forecasts. This study examines the variation in typhoon forecasts caused by different choices of arbitrary physics options in WRF and their influence on storm surge forecasts. Eight frequently used combinations of cloud microphysics a...
Article
In this study, laboratory experiments were conducted to observe drifting of objects transported by a tsunami. Tsunami-induced drift motion was simulated using various numerical models, and the results were compared. Experiments were performed with and without obstacles in the terrain, and the differences were assessed. The spread of debris occurred...
Article
Full-text available
Numerous tsunami numerical models have been proposed, but their prediction accuracies have not been directly compared. For quantifying the modeling uncertainties, the authors statistically analyzed the prediction results submitted by participants in the tsunami blind contest held at the 17th World Conference on Earthquake Engineering. The reproduci...
Article
Full-text available
The tsunami caused by the Tonga submarine volcanic eruption that occurred at 13:15 Japan Time (JST) on January 15, 2022, exposed a blind spot in Japan’s tsunami monitoring and warning system, which was established in 1952 for local tsunamis and expanded to distant tsunamis after the 1960 Chile tsunami. This paper summarizes how the warning system r...
Article
Full-text available
Researchers have developed tsunami inundation models based on nonlinear shallow water equations to estimate tsunami propagation and inundation. However, their empirical results are not in perfect agreement with those of other research institutes, even though the same governing equations are used. Therefore, we quantitatively evaluated the variabili...
Article
To evaluate the destruction of structures by tsunami forces, it is desirable to correctly evaluate not only the sustained forces due to the water level but also the impact forces generated at the tsunami front. To this end, it is necessary to conduct numerical simulations based on the three-dimensional Navier–Stokes equations, but the validity of t...
Article
The Keulegan-Carpenter (KC) number is the main dimensionless parameter that affects the local scour of offshore wind power monopile foundations. This study conducted large-scale (1:13) physical model tests to study the local scour shape, equilibrium scour depth, and local scour volume of offshore wind power monopiles under the action of irregular w...
Article
Full-text available
Tsunami generation due to a landslide has been simulated using various numerical models, and the resulting water surface displacements from the models, as well as the corresponding experimental data, are compared. The numerical models used in this study are a two-layer long-wave model, a two-level non-hydrostatic model, a three-dimensional model, a...
Article
The detailed understanding of tsunami hazard risk using numerical simulations requires a numerical model that can accurately predict tsunami inundation phenomena on land. In such models, the structural effects are indirectly considered using the variation of bottom roughness as a proxy for the differences in building densities. Only a few studies h...
Article
Full-text available
Assessing the risk of tsunami-driven debris has increasingly been recognized as an important design consideration. The recent ASCE/SEI7-16 standard Chapter 6 requires all the areas included within a 22.5° spreading angle from the debris source to consider the debris impact. However, it would be more reasonable to estimate the risks using numerical...
Article
A series of physical model experiments of tsunami inundation over an idealized industrial site located in a coastal area were performed in this study. Two types of tsunami-like waves with markedly different characteristics were generated. The first was a single long wave and the second was a long wave with soliton fission (undular bore). This study...
Article
Full-text available
On September 28 2018, an Mw 7.5 strike-slip earthquake occurred to the north of Palu Bay on the Sulawesi Island, Indonesia. This triggered a destructive tsunami within the bay, which reached Palu city. Simulation have been conducted to investigate the landslide source. However, the tsunami should be investigated considering a physical model in the...
Article
Full-text available
https://sdgs.un.org/sites/default/files/2021-05/IATT%20report%20on%20emerging%20techs%202021.pdf
Article
Issues related to climate change in coastal areas have been addressed in a wide variety of academic fields and societies, including meteorology, marine physics, chemistry, biology, ecology, policy science, and economics. However, the efforts and initiatives of each relevant academic field or society are rarely shared because climate change science...
Article
When a tsunami strikes, not only structures but also many people are swept away, leading to an increase in the number of missing and dead people. It is important to predict the behavior of drifted debris and the extent of drift after a tsunami in order to protect facilities and save lives. However, the drift behavior is highly variable. In this stu...
Article
In this study, the effectiveness of the movable breakwaters for reducing the water level and preventing storm surge was investigated at Tokyo Bay under the worst-case scenario based on an empirical typhoon model. As a result, the water level reduction effect of the movable breakwaters at the harbor was 11.2-42.2 % for each installation and 27.4-45....
Article
For the scour protection against local scouring phenomena in the foundation of monopile offshore wind farms, there are still many quantitative studies on the necessary scour protection area. In addition, it is necessary to consider the scale effect in hydraulic model experiments dealing with geomaterials. In this study, we conducted experiments at...
Article
In this study, a method for predicting the drift of vessels during typhoons is developed, and the accuracy of predicting the drift of vessels is investigated by calculating the drift using various weather prediction models. The prediction method is based on the domain meteorological model WRF, the Japan Meteorological Agency's GSM (Japan region), a...
Article
Coastal vegetation, such as coastal forests and mangroves, has been focused on its mitigation effects as green infrastructure. However, the current numerical calculation speeds do not allow for detailed modeling of vegetation with complex root structures. In this study, we aimed to establish a low-cost calculation method for mangroves by using the...
Article
In order to improve the accuracy of storm surge prediction in real time, it is necessary to improve the accuracy of typhoon prediction. For this purpose, it is important to properly set the calculation conditions of meteorological models, which have often been determined empirically. In this study, we developed a system using machine learning to au...
Article
Since the event of the 2018 Palu tsunami in Indonesia, the countermeasures for reducing tsunami damage have been considered in Palu city where the destructive landslide tsunami event occurred. The tsunami induced by landslide in the Palu bay could reach the coastline of Palu city within a few minutes. On the other hand, there is a possibility that...
Article
We propose the coRaL method (a method of incorporating Random phase model into Logic tree approach), which is a probabilistic tsunami hazard assessment method with a high objectivity by reforming the evaluation method of earthquake asperity model and the concept of aleatory uncertainty among the probabilistic methods using logic tree approach conve...
Article
In this study, the lift pressures acting on a horizontal slab due to traveling and overlapping waves were analyzed using a gas-liquid two-phase numerical wave models, and the pressure reduction effect by adding holes to the slab was investigated. As a result, it was confirmed from the numerical simulation that the pressure caused by the air compres...
Article
The prediction and control of wave motions during the installation of a caisson can improve the efficiency of the work. In this study, the oscillation of a caisson is investigated using a solid-gas-liquid three-phase numerical wave tank, which can analyze the movement and deformation of structures and the contact between structures due to fluid mot...
Article
In this study, as an initial step for instantaneous tsunami arrival time prediction after an earthquake, we used images of the initial water level obtained from numerical tsunami simulations for the Nankai Trough to predict the tsunami arrival time using machine learning. The arrival times were pre-processed and colored every 3 minutes and every 2...
Article
Numerous combinations of disaster reduction facilities should be taken into consideration to evaluate the damages of inundation due to probabilistic tsunami hazard. In this study, we implemented it and investigated how the tsunami inundation probability changes by using the levee fragility model. coRaL method was used to obtain the inundation depth...
Article
Full-text available
On 22 December 2018, a volcanic eruption occurred at Anak Krakatau, Sunda Strait, Indonesia, which induced a tsunami. At the coastal area in the Sunda Strait, the destructive tsunami destroyed many structures and killed more than 400 people approximately 30 to 40 min after the eruption. In this event, it has been reported that many residents start...
Article
Full-text available
Seaside facilities such as pier are affected by uplift forces due to storm surge and waves caused by typhoons. Therefore, detailed knowledge of external force is required for designing the pier (Tanimoto et al., 1978). Previously, the elucidation of the uplift forces and the shock wave pressure has been a major issue. Indeed, it has been clarified...
Article
Full-text available
Along with the 2011 Great East Japan Earthquake (Mw 9.0), a huge tsunami exceeding a maximum wave height of 15 m occurred. Many people and objects were destroyed and drifted by the tsunami. In addition, these debris were transported to various places that could not be predicted, resulting in significant secondary damage and increase in the number o...
Article
Full-text available
A number of studies which handle wave height attenuation effect due to coastal vegetation such as mangroves and coastal forests have been performed. In recent years, for considering effect of the mangrove roots, actual trees have been used for laboratory test. Chang (2019) proposed a formula for calculating C_D and C_M from Re and KC through experi...
Article
Full-text available
The devastating damage to buildings and infrastructure caused by the 2011 Tohoku-oki earthquake and tsunami highlighted the importance of evaluating tsunami impacts in areas at risk of tsunami inundation for disaster prevention and mitigation. Evaluation technologies have been vigorously researched and developed over the past decade. A wide variety...
Article
Full-text available
Although it is still tricky to stably solve multi-directional irregular waves using a three-dimensional numerical wave tank, several studies have been carried out in recent years with the development of computers (e.g., Wang et al., 2019). In order to calculate stable multidirectional irregular waves, it is necessary to devise the incident boundary...
Article
Full-text available
The vertical telescopic breakwater(VTB), which is a new breakwater that permits the navigation of ships, remain at the bottom of the sea during calm and rise to the surface during tsunamis or storm surges. Kawai et al. (2017) and Arikawa et al. (2019) found that it is effective not only for swell waves, but also for long-period waves simulating tsu...
Article
Full-text available
In recent years, offshore wind farming has spread all over the world, and there has been rapid growth of not only conventional onshore wind farming but also offshore wind farming in the sea. However, there are many problems to be solved in offshore wind farming. Among them, the scour of the ocean floor caused by wave and tide has a great influence...
Article
A post-event survey of the coastal impacts of Typhoon Hagibis was conducted in the Greater Tokyo and Shizuoka areas. The typhoon’s intensive landfall generated the highest-level storm surges recorded in the study area with a maximum sea-level anomaly of nearly 2 m at the head of Tokyo Bay. Highly populated coastal areas in the inner sheltered part...
Article
Typhoon Faxai caused severe damages along the western shore of Tokyo Bay, Japan in September 2019. Retaining a relatively small radius of maximum wind, Faxai passed across the center of Tokyo Bay and caused intensive wind and waves. While the sea level anomaly recorded at several tide gauge stations along Tokyo Bay were at most 1 m, and no signific...
Chapter
In considering the secondary damage of a tsunami, it is important to consider whether a container placed in a port will collide with structures behind in the run-up tsunami wave. Therefore, we conducted a hydraulic experiment to investigate the behavior of tsunami debris due to the run-up wave. As a result, not only the run-up wave but also the ref...
Chapter
The Routes of ships are mainly determined based on their speed and roll angles. The routes are also determined based on the estimated weather and wave situation predicted using numerical simulation, economic and political situations, and the captain’s experience. Many researchers have used data assimilation techniques for improving the accuracy of...
Article
Numerical simulations are now being applied in place of the physical model experiments that have been used in the design of maritime structures. In this paper, the transition from model experiments to numerical simulations in the field of design of maritime structures is investigated. For wave deformations such as wave shoaling and wave breaking an...
Article
We conducted the prediction in case of the 2019 typhoon Hagibis to examine the accuracy of the surge and waves prediction using global WRF. We obtained the most reliable sustained maximum wind speed and peak value of surge and significant wave height in case that simulation of the typhoon was started approximate 1000 km offshore from Japan coast. T...
Article
Field survey of bathymetry, sediment and bedrock of the narrow in Kesennuma Bay have been investigated. Numerical simulations of tsunami-induced sediment transport during the 2011 Tohoku tsunami were also improved by using the bedrock and sediment dataset. After the tsunami, depositions at the center of the narrows, erosions at the sides and the no...
Article
In this study, in order to validate the modeling of coastal forest within surf zone based using the three dimensional simulation, the simulation results and experimental values were compared. Laboratory experiments for revealing attenuation of wave height due to coastal forest has been conducted. After the validation of our numerical simulation, dr...
Article
Previous studies have shown that siltfences reduce the effect of preventing the spread of pollutants when flow velocity was increased. However, under the present circumstances, it may be necessary to use siltfences even under the condition that flow velocity is high. On the other hand, there is also an example that installation of multiple siltfenc...
Article
Aiming for the advancement of historical and prospective tsunami scale evaluations, and focusing on the tsunami run-up, series solutions to the tip position a(t), velocity U (=da/dt) and acceleration d²a/dt² in the tip region of inundation flow with sediment over a uniformly sloping bottom under the condition that the friction factor K is not linke...
Article
Many hydraulic experiments have been carried out on the physical elucidation of lift force and shock wave pressure. In recent years, computational techniques have been developed and wave pres-sure is being studied using numerical calculations. However, there are few case studies by numerical calculation for phenomena such as lift force because it m...
Article
When tsunami contains sediments, its wave force become strong due to increase of its density. This has a great influence on building damages. The sediment diameter collected from the tsunami at the time of the 2011 Tohoku-oki earthquake remained in Kesennuma City, Miyagi Prefecture was 6.74 µm, which is classified as silt. Tsunami wave force which...
Article
Coastal boulders formed by past tsunami or storm waves have been reported around the world. The relationship between size of tsunami or storm wave and boulder weight is nesssary to be investigated in more cases for contributing the research of coastal boulders to future disaster prevention at coastal area. At Okinoshima, Chiba prefecture, several t...
Article
It has been reported that the optimal route can be used to CO2 during ship navigation, and it is important to predictthe wave field around the ship up to several hours ahead. In order to improve the avvuracy of local and short-term predictions such as the around field around ships, it is necessary to develop a mechanism to correct the prediction us...
Article
As a countermeasure for reducing tsunami damage, it is necessary to consider evacuation support and evacuation actions based on tsunami arrival time. Many recent tsunami evacuation assistances only have showed the inundation area, information of evacuation site, and shortest route to evacuation sites. However, safety of routes to evacuation shelter...
Article
We conducted a hydraulic experiment in case that tsunami debris set on the land model. The tsunami debris was drifted at the tip of a runup wave and collided with the reflection wall. Then, we examined the effect of reducing the collision speed due to the buffer effect which occurred at the tip of the runup wave that firstly collided with the refle...
Article
Regarding the local scour phenomenon at the base of a monopile type offshore wind power generator, although some existing formulas have been proposed, the effect of the countermeasure construction has been still unclear. In this study, we investigated the effect of countermeasure construction and conducted the reproduction of the local scour phenom...
Article
In this study, in order to contribute to the prediction of drifting ships during a typhoon, we examined the variations of size and moving distance of ships located in Tokyo Bay during the typhoon no. 15 and 19 in 2019. As a result of AIS data analysis, moving distance of ships become long if the size of ship is small. We also conducted numerical si...
Article
Full-text available
We present analysis of the December 2018 Anak Krakatau tsunami in Sunda Strait, Indonesia, from a combination of post-tsunami field surveys, bathymetric changes and spectral analysis of the tsunami tide gauge records. Post-tsunami surveys revealed moderate tsunami height along the coast of Sumatra and Java with maximum surveyed runup of 13.5 m and...
Article
Full-text available
The July 20, 2017 Bodrum–Kos Earthquake caused tsunami wave motions and damage in the south of Bodrum Peninsula, Turkey, and on Kos Island, Greece. Immediately after the earthquake, we conducted several post-tsunami field surveys including interviews in coastal zones impacted by the tsunami, i.e., the coastlines of Bodrum Peninsula, Karaada Islet a...
Article
Full-text available
Typhoon Jebi in 2018 caused severe damage along areas of Osaka Bay, Japan. After the storm, a Japan Society of Civil Engineers (JSCE) coastal survey group surveyed the coastal impacts and recorded watermarks inside Osaka Bay and along the Pacific. The maximum storm tide recorded by a tide gauge was 3.29 m at the Osaka Tide Station, which is a histo...
Article
It is important to advance preparation for a tsunami disaster, one of the great concerns in Japan. Forecasting tsunami inundation is one such solution, which contributes to perceiving the danger of the tsunami, as the inundation is directly linked with the damage. Therefore, we developed a new real-time tsunami forecast system, aimed at rapidly and...
Article
In this research, we develop a numerical fluid simulator coupled with a structural analysis. The purpose of this system is to efficiently calculate all stages of a tsunami from source to runup, including structural deformation. We also investigate the stability of breakwaters at Kamaishi port. The numerical results are compared with physical experi...
Article
Full-text available
Hurricanes Irma and Maria caused catastrophic damages across the Caribbean Islands during the 2017 hurricane season. After the storms, a joint United States–Japanese team investigated coastal impacts in the US Virgin Islands, which are composed of the islands of St. Thomas, St. John, Water Island, and St. Croix. Coastal inundation was dominated by...
Article
In recent years, sea conditions are becoming severe due to climate change. In addition, it is required to cope with the action of multiple forces. There are cases where the conventional hydraulic model experiment facilities can not cope with these changes in the situation in recent years. Therefore, it is intended to organize the existing hydraulic...
Article
To evaluate the performance of wave dissipation structure, cross-sectional experiments has been performed to measure the reflectance coefficient. However, this method is insufficient, because waves sometimes propagate to a dissipating wave structure in the oblique direction. In constant, in an experiment using a plane water tank, multiple reflectio...
Article
As a result of the Great East Japan Earthquake, coastal structures were submerged by the tsunami. Part of these structures were scoured, resulting in a reduction of the bearing capacity of these structures. As a result, some caissons were moved and some of them were collapsed, although the actual tsunami water depth did not exceed the threshold whi...
Article
In considering the secondary damage of a tsunami, it is important to consider whether a container placed in a port will collide with structures behind in the run-up tsunami wave. Therefore, we conducted a hydraulic experiment to investigate the behavior of tsunami debris due to the run-up wave. As a result, not only the run-up wave but also the ref...