Saeki Kawagoe

Fukushima University · Faculty of symbiotic systems science

Study region In this study, three provinces in Northeast Vietnam including Bac Kan, Thai Nguyen, and Tuyen Quang are examined to determine the precipitation variation characteristics. Study focus The average yearly temperature during the last two decades in Northeast Vietnam has increased by 0.72 °C when compared to the period 1962–1990. The Claus...

On 11 March 2011, the Great East Japan Earthquake generated huge tsunami waves. Then, tsunami propagation occurred in rivers, resulting in further expansion of the flooded area. Full data sets of tsunami characteristics such as tsunami inland and river propagation distances as well as the river geometries from all rivers within the Tohoku District...

Unmanned aerial vehicles (UAVs) are widely utilized for surveying various sediment disasters, and the high-resolution imaging they provide reveals detailed topographic characteristics. However, the availability of multitemporal UAV observations, which reveal geomorphological changes before and after the disaster, is still limited. In this research,...

We propose a method for evaluating the risks of slope failure induced by heavy rain over a wide area by combining infiltration analysis, surface flow analysis, and slope stability analysis based on three-dimensional limit equilibrium method. The influence of the resolution of terrain data is also examined. To determine rainfall-induced water transp...

This study determined the resistance of sediment discharge buffering effect using case study of mass movment along a river channel in the Gofukuya River (Marumori, Miyagi Prefecture) during the East Japan Typhoon 2019. The case of the Gofukuya River was verified using spatial numerical information acquired with LP(Laser profilers) and UAV, as the a...

In this study, Actual mass movements in the Granite Zone (Abukuma highland during Hagibis) were verified environmental conditions. In particular, we focused on the chemical composition that may induce the degree of geological weathering. The mass movement cases were databased from satellite imagery (Sentinel-2B). Spatial information based on numeri...

Vegetation and soil characteristics of two physiognomic types of young Pinus thunbergii-dominated stands, that is, naturally recovered type on beach ridge and sand dune (RS; five sites) and afforested type on artificial mounds (AS; four sites) , were compared along Sendai Bay after the Great East Japan Earthquake and Tsunami in 2011. Of the 111 vas...

This study evaluated the changes in the exposed population to river flooding, inland flooding, and slope failure from 2015 to 2100 with population changes by shared socioeconomic pathways (SSPs). The exposed population to river and inland flooding was defined as the population living in the area with inundated depth of 45 cm or more, which expresse...

In this study, we developed an Eco-DRR (Ecosystem based Disaster Risk Reduction) map for Mishima Town, Fukushima Prefecture, which is combine with forest industry and slope disaster reduction. As the information obtained from the map, we inducted suitable areas as produce paulownia tomentosa steudel. We expect the planting of paulownia tomentosa st...

In this study, we attempted to develop information that can be used as an adaptation measure to prepare spatio-temporal sediment disaster prone areas risk information according to maximum heavy rainfall from the past to the future forecast. The target area is Nagano Prefecture. The risk information of the warning area was derived using the probable...

The surface temperature distribution in mountain scale is important in various fields such as hydrological processes, plant ecology, snow and ice fields, but its observation is difficult in high temporal and spatial resolution inside 1 km² catchment. In this study, surface temperature distribution was observed by UAV with 1 hour and around 20 cm re...

North Vietnam is a lot of landslide generate region due to heavy rainfall or tropical storms, Steep slopes on mountainous sides and human activities such as road or house constructions. Heavy rainfall events are estimated by climate change in the future. Therefore, it is necessary to understand landslide characteristic due to rainfall variation. Th...

This study approaches are to obtain regional snow information relathionship between chemical composition and short period snow fall event for future environmental problem(climate change, environmental load and so on). We set temperate zone heavy snow area(Fukushima prefecture) as study area. This study results((1)-(3)) is as fellow. (1) An ion and...

Target of the study is development of verification database to estimate regional spatial-temporal snow variation(snowfall process and deposited snow environment) due to chemical approach. We tried to research snow-fall process using compared with stable isotope and ion composition in Agano basin(From 2014 to 2016). As results, Agano basin is ruled...

It is important to obtain the trend information of Al(Aluminium) dynamics due to watershed environmental evaluation. We tried to survey of Al dynamics(include produce) in join potion between Abukuma river and Ara river(Abukuma sub basin). It is used to water quality information(trace element and ion composition) approach to comparing spatio-tampora...

Japan is an area affected strongly by land surface upheaval and by climate change instability. Background evidence of increasing and magnifying geo-disasters includes the following: (i) frequent and extremely severe torrential rainfall; (ii) high and increasing frequency of strong earthquakes (5+ and 6- as the Japan Meteorological Agency seismic in...

This study is development of slope failure risk information output to support regional government using adaptation conter measure due to climate change. As study aim, we tried to pursue the sophistication of traditional approach slope failure probablility model (pay attend: spatial resolution, geological condition). And we terid to develop slope fa...

Mountainous area in North Vietnam is considered as one of the most prone region to landslide in Vietnam. Landslides in this area often occurs under the influences of heavy rainfall or tropical storms, steep slopes on mountainous sides and human activities such as road or house constructions. This paper applied Landsat satellite images and calculate...

The damage cost distribution for water-related compound disaster, which flood, storm surge and landslide occurred at the same time, was estimated quantitatively in Japan. Compound disaster was assumed to be caused by rainfall and sea level due to the lowest atmospheric pressure. Firstly, maximum values of rainfall and tide level deviation at the co...

We tried to develop climate class due to external load database on climate change. And It used verification of Japanese reservoir water index(Eutrophication frequency ratio, and turbidity) to find out relation to external load production. Dtail resuts are as follows: 1) There is a lot of external load at Bload-leaved deciduous forest, Plannning are...

We tried an analysis about the snow condition in Agano basin using stable isotope ratio. This result was compared annual Seasonal Snow depth Index(SSDI). As results, The snow feature distribution was obtained depend on regional scale. Dtail resuts are as follows: ①Difference of regional snow depth spreads at Agano basin in recent years. ②Japan sea...

The purpose of this study is to prepare basic snow distribution data to areas along the Sea of Japan. It is useful in estimation future snow distribution due to climate change. As study targets, we try to verify relationship between surface sea temperature (SST) and snow depth distribution. And, we obtained local snow condition to characterized ion...

On March 11, 2011, the Great East Japan Earthquake generated huge tsunami waves. Then, tsunami propagation occurred and expanded the flooded area. Tsunami propagation distance was collected and analyzed to estimate the area where we need the defense. It was found tsunami propagation distance in river is about 1.2 to 4.5 times as long as land area a...

This study evaluates the effects of climate change on economic losses due to flood-related damage in Japan. Three selected GCM climate data were downscaled using an analytical method that uses observed precipitation data as the reference resolution. The downscaled climate data were used to estimate extreme rainfall for different return periods. The...

We have evaluated relationship between sediment hazard, regional geomorphic properties and heavy rainfall in Tokyo. It tried to clarify regional characteristic of the sediment hazard by using spatial numeric information. The antecedent precipitation index was used sediment analysis as heavy rainfall condition. The results obtained are as follows; 1...

A gigantic earthquake with a magnitude of 9.0, the maximum ever recorded in Japan, struck the Tohoku region of Japan on 11 March, 2011. As a result, as many as 745 reservoirs in Fukushima prefecture were damaged. The failure of the earth-fill dam at the Fujinuma reservoir in Fukushima prefecture resulted in eight deaths in a village downstream. Thi...

The Tohoku region, Northeast Japan, was hit by a gigantic earthquake which occurred in the Pacific close to Tohoku, and subsequently by a giant tsunami. These hazards have caused huge damage on the eastern coast Japan. The earthquake’s magnitude was 9.0, the strongest ever recorded in Japan. The tsunami was also historical as its run-up height reac...

We evaluated the past impacts of urbanization and climate change on groundwater—in particular, aquifer temperature—in the Sendai plain, Japan, and further compared with the probable changes due to changing climate in the future. A series of simulations were performed and matched with the observed temperature-depth profiles as a preliminary step for...

The objective of this study was to estimate the potential sediment yield distribution in Japan attributed to extreme-rainfall-induced slope failures in the future. For this purpose, a regression relationship between the slope failure hazard probability and the subsequent sediment yield was developed by using sediment yield observations from 59 dams...

The objective of this study was to estimate the potential sediment yield distribution in Japan attributed to extreme-rainfall-induced slope failures in the future. For this purpose, a regression relationship between the slope failure probability and the subsequent sediment yield was developed by using sediment yield observations from 59 dams throug...

To evaluate the frequency and distribution of landslides hazards over Japan, this study uses a probabilistic model based on multiple logistic regression analysis. Study particular concerns several important physical parameters such as hydraulic parameters, geographical parameters and the geological parameters which are considered to be influential...

The probability distribution of slope hazard in Thailand was made by a model developed by multiple logistic regression analysis. Relative relief, hydraulic gradient due to extreme rainfall and geological features were used as variables in this model. The probability distribution is composed by 5 km × 5 km cells that can reflect the risk management...

To evaluate the frequency and distribution of landslides hazards over Japan, this study uses a probabilistic model based on multiple logistic regression analysis. Study particular concerns several important physical parameters such as hydraulic parameters, geographical parameters and the geological parameters which are considered to be influential...

The fourth report of the Intergovernmental Panel on Climate Change (IPCC) provoked a significant amount of controversy, as experts have sought to apply it to climate change in Japan. In particular, the Ministry of Land, Infrastructure, Transportation, and Tourism (MLIT) organized a committee of experts responsible for implementing flood control pol...

This study is pertaining to an evaluation of landslide occurrence on natural terrain due to snowmelt in Japan, using a probabilistic model based on multiple logistic regression analysis. The evaluation concerns several physical parameters such as hydraulic parameters, geographical parameters and geological parameters which are considered to be infl...

Extreme precipitation is forecasted by global warming with GCM (General circulation model). The water resource crisis and an increase in the disaster are feared with cause as extreme precipitation in the future. It is necessary to evaluate a high dangerous region by the spatial-temporal distribution to risk mitigation. The risk map is useful of cou...

This study focuses on the influence of dam reservoir to cause excessive sediment disaster due to anomalous weather conditions by global warming. First, a sediment hazard probability model was developed and interpreted with observed sediment deposition records. Sediment yield was estimated for various return period and 5 year return period was found...

The purpose of this study is to understand effect of different litter layers on water storage. An experimental system with rainfall variation expresses the storage process through measurements of discharge and soil moisture. Also 2D Richards model with hysteresis and the experimental results show the permeability of different litters, broadleaf, ac...