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  1. Article ; Online: Study on PMP estimation for the flood risk evaluation of hydropower dams in consideration of the future climate change

    Kobayashi Yuzo / Nakakita Eiichi / Takemi Tetsuya / Otsuru Yasunobu / Abe Tomohiko

    E3S Web of Conferences, Vol 346, p

    2022  Volume 03020

    Abstract: It is important for hydropower dams to estimate PMP (Probable Maximum Precipitation) appropriately and to prepare the plan of facilities modification and operational changes in advance, because the future flood risk by climate change influence is getting ...

    Abstract It is important for hydropower dams to estimate PMP (Probable Maximum Precipitation) appropriately and to prepare the plan of facilities modification and operational changes in advance, because the future flood risk by climate change influence is getting higher. In this paper, we compared three methods of PMP estimation, the conventional method applying DAD (Duration Area and Depth) analysis based on the experienced rain results, the product of d4PDF (database for Policy Decision making for Future climate change) that is the latest climate model ensemble prediction, and the pseudo-global warming experimental results on the typhoon. It was showed that PMP by d4PDF and the pseudo-global warming experimental results were larger than that by DAD analysis and fluctuated smoothly and reasonably over time. It is preferable and reasonable to evaluate the PMP risk applying DAD analysis at the rough examination, and the estimations applying d4PDF or pseudo-global warming scenario is suitable for more detailed examination.
    Keywords Environmental sciences ; GE1-350
    Subject code 910
    Language English
    Publishing date 2022-01-01T00:00:00Z
    Publisher EDP Sciences
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article: Large-Scale Turbulence Structures in the Atmospheric Boundary Layer Observed above the Suburbs of Kyoto City, Japan

    Horiguchi, Mitsuaki / Tatsumi, Kenichi / Poulidis, Alexandros-Panagiotis / Yoshida, Toshiya / Takemi, Tetsuya

    Boundary-layer meteorology. 2022 Aug., v. 184, no. 2

    2022  

    Abstract: The characteristics and occurrence conditions of large-scale turbulence structures in the atmospheric boundary layer (ABL) are investigated above the suburbs of Kyoto City, Japan. An extensive observational set-up, including sonic anemometers– ... ...

    Abstract The characteristics and occurrence conditions of large-scale turbulence structures in the atmospheric boundary layer (ABL) are investigated above the suburbs of Kyoto City, Japan. An extensive observational set-up, including sonic anemometers–thermometers mounted on a tower, Doppler lidar, and radiosondes, was used to examine the turbulence structures and vertical profiles of the ABL downwind from the city. In near-neutral situations, large-scale turbulence structures with temporal scales of 100‒300 s are detected by the wavelet analysis in the time series of the streamwise velocity component measured in the surface layer. A shift towards unstable conditions is found to be favourable for the emergence of large-scale turbulence structures. Furthermore, the existence of these structures is seen to be related to the development of the ABL and the change of the turbulence situation in the daytime. On average at this site, wind speed in the lower ABL increases in the afternoon. From the intensive observations, we can infer that the downward transfer of momentum via turbulent mixing and other mechanisms extends a high-speed layer at the upper levels towards the surface. Intermittent occurrence of the further increase of wind speed in an interval of several tens of minutes is also found. Turbulence structures are clearly identified in these periods of higher wind speed.
    Keywords Japan ; lidar ; meteorology ; momentum ; time series analysis ; troposphere ; turbulent flow ; wavelet ; wind speed
    Language English
    Dates of publication 2022-08
    Size p. 333-354.
    Publishing place Springer Netherlands
    Document type Article
    ZDB-ID 1477639-X
    ISSN 1573-1472 ; 0006-8314
    ISSN (online) 1573-1472
    ISSN 0006-8314
    DOI 10.1007/s10546-022-00707-8
    Database NAL-Catalogue (AGRICOLA)

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  3. Article: Convection and precipitation under various stability and shear conditions: Squall lines in tropical versus midlatitude environment

    Takemi, Tetsuya

    Atmospheric research. 2014 June 01, v. 142

    2014  

    Abstract: This study investigates the sensitivity of the structure and intensity of squall lines to the vertical profile of temperature and moisture that are intended to represent a tropical, oceanic and a midlatitude, continental environment by conducting a set ... ...

    Abstract This study investigates the sensitivity of the structure and intensity of squall lines to the vertical profile of temperature and moisture that are intended to represent a tropical, oceanic and a midlatitude, continental environment by conducting a set of numerical experiments with a nonhydrostatic atmospheric model at a convection-resolving resolution. In the experiments the vertical distributions of convective available potential energy (CAPE) for air parcels originating at various heights are controlled by changing relative humidity for the tropical and the midlatitude condition. It was shown that the strength and areal extent of updrafts within the simulated squall lines are significantly regulated by environmental temperature lapse rate. A condition with a larger lapse rate leads to the development of widespread, strong updrafts. The difference in the vertical profile of buoyancy for lifted air parcels is key to delineating the difference in the updraft statistics under different thermodynamic conditions. In contrast, it was found that the precipitation amount is controlled by the vertical distribution of CAPE. The precipitation amount increases with the increase in the depth of the layer having a significant amount of CAPE.
    Keywords air ; ambient temperature ; convection ; energy ; latitude ; models ; relative humidity ; statistics ; thermodynamics
    Language English
    Dates of publication 2014-0601
    Size p. 111-123.
    Publishing place Elsevier B.V.
    Document type Article
    ISSN 0169-8095
    DOI 10.1016/j.atmosres.2013.07.010
    Database NAL-Catalogue (AGRICOLA)

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  4. Book ; Online: Long-Term Ash Dispersal Dataset of the Sakurajima Taisho Eruption for Ashfall Disaster Countermeasure

    Rahadianto, Haris / Tatano, Hirokazu / Iguchi, Masato / Tanaka, Hiroshi L. / Takemi, Tetsuya / Roy, Sudip

    eISSN: 1866-3516

    2022  

    Abstract: We present the ashfall deposit and airborne ash concentration dataset from ash dispersal simulation of a large-scale explosive volcanic eruption as a reference for ashfall disaster countermeasure. We select the Taisho (1914) eruption in Sakurajima ... ...

    Abstract We present the ashfall deposit and airborne ash concentration dataset from ash dispersal simulation of a large-scale explosive volcanic eruption as a reference for ashfall disaster countermeasure. We select the Taisho (1914) eruption in Sakurajima volcano, regarded as the strongest eruption in Japan in the last century, as our case study to provide a baseline for the worst-case scenario. We employ one eruption scenario approach by replicating the actual eruption under various extended weather conditions to show how it would affect contemporary Japan. Accumulated ashfall has devastating impacts on both surrounding areas of the volcano and other regions, affecting airline transportation, socio-economics activities, and human health. Therefore, it is crucial to discover places with a high probability of exposure to ashfall deposition. This knowledge can help assess the additional risk in the infrastructures, human lives, and economic impacts to make a better volcanic eruption response plan. We generate the ash dispersal dataset by simulating the ash transport of the Taisho eruption scenario with a volcanic ash dispersal model and meteorological reanalysis data for 64 years (1958–2021). We explain the dataset production process and provide the dataset in multiple formats for broader audiences. We also clarify the validity of the dataset with its limitations and uncertainties. The dataset is available at the DesignSafe-CI Data Depot: https://www.designsafe-ci.org/data/browser/public/designsafe.storage.published/PRJ-2848v2 or through the DOI: https://www.doi.org/10.17603/ds2-vw5f-t920 by selecting Version 2 (Rahadianto and Tatano, 2020).
    Subject code 910
    Language English
    Publishing date 2022-06-07
    Publishing country de
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  5. Book ; Online: Long-term ash dispersal dataset of the Sakurajima Taisho eruption for ashfall disaster countermeasure

    Rahadianto, Haris / Tatano, Hirokazu / Iguchi, Masato / Tanaka, Hiroshi L. / Takemi, Tetsuya / Roy, Sudip

    eISSN: 1866-3516

    2022  

    Abstract: A large volcanic eruption can generate large amounts of ash which affect the socio-economic activities of surrounding areas, affecting airline transportation, socio-economics activities, and human health. Accumulated ashfall has devastating impacts on ... ...

    Abstract A large volcanic eruption can generate large amounts of ash which affect the socio-economic activities of surrounding areas, affecting airline transportation, socio-economics activities, and human health. Accumulated ashfall has devastating impacts on areas surrounding the volcano and in other regions, and eruption scale and weather conditions may escalate ashfall hazards to wider areas. It is crucial to discover places with a high probability of exposure to ashfall deposition. Here, as a reference for ashfall disaster countermeasures, we present a dataset containing the estimated distributions of the ashfall deposit and airborne ash concentration, obtained from a simulation of ash dispersal following a large-scale explosive volcanic eruption. We selected the Taisho (1914) eruption of the Sakurajima volcano, as our case study. This was the strongest eruption in Japan in the last century, and our study provides a baseline for a worst-case scenario. We employed one eruption scenario (OES) approach by replicating the actual event under various extended weather conditions to show how it would affect contemporary Japan. We generated an ash dispersal dataset by simulating the ash transport of the Taisho eruption scenario using a volcanic ash dispersal model and meteorological reanalysis data for 64 years (1958–2021). We explain the dataset production and provide the dataset in multiple formats for broader audiences. We examine the validity of the dataset, its limitations, and its uncertainties. Countermeasure strategies can be derived from this dataset to reduce ashfall risk. The dataset is available at the DesignSafe-CI Data Depot: https://www.designsafe-ci.org/data/browser/public/designsafe.storage.published/PRJ-2848v2 or through the following DOI: https://doi.org/10.17603/ds2-vw5f-t920 by selecting Version 2 (Rahadianto and Tatano, 2020).
    Subject code 333
    Language English
    Publishing date 2022-12-02
    Publishing country de
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  6. Article: Long‐term impacts of ocean wave‐dependent roughness on global climate systems

    Shimura, Tomoya / Mori, Nobuhito / Takemi, Tetsuya / Mizuta, Ryo

    Journal of geophysical research. 2017 Mar., v. 122, no. 3

    2017  

    Abstract: Ocean surface waves can play an active role in climate systems, but they are often ignored in Global Climate Models (GCMs). Wave‐dependent surface roughness was implemented within the Atmospheric GCM (MRI‐AGCM) using the spectral wave model WAVEWATCH III. ...

    Abstract Ocean surface waves can play an active role in climate systems, but they are often ignored in Global Climate Models (GCMs). Wave‐dependent surface roughness was implemented within the Atmospheric GCM (MRI‐AGCM) using the spectral wave model WAVEWATCH III. Two types of wave‐dependent roughness, due to wave steepness and to wave age, were considered. Climate simulations with wave‐dependent roughness were compared to simulations with just wind speed‐dependent roughness. In climate simulation with wave steepness‐dependent roughness, the spatial distribution of roughness is correlated to that of swell dominance. In simulation with wave age‐dependent roughness, the spatial distribution of roughness is correlated to that of wind direction stationarity. Both simulations show reduced roughness in the tropics, which leads to an enhancement of surface wind speeds by up to 15%; these enhanced wind speeds are closer to observations compared with the baseline simulation with just wind speed‐dependent roughness. We find that the reduced roughness and the enhanced wind speeds in the tropics lead to significant changes in atmospheric circulation, as in Hadley circulation and precipitation. The characteristic responses of the Hadley circulation and precipitation to changing sea surface roughness are presented.
    Keywords atmospheric circulation ; climate models ; geophysics ; research ; roughness ; surface roughness ; wind direction
    Language English
    Dates of publication 2017-03
    Size p. 1995-2011.
    Publishing place John Wiley & Sons, Ltd
    Document type Article
    Note JOURNAL ARTICLE
    ZDB-ID 161667-5
    ISSN 2169-9291 ; 2169-9275 ; 0148-0227 ; 0196-2256
    ISSN (online) 2169-9291
    ISSN 2169-9275 ; 0148-0227 ; 0196-2256
    DOI 10.1002/2016JC012621
    Database NAL-Catalogue (AGRICOLA)

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    In stock of ZB MED Bonn / Germany

    Z 2004/712: Show issues
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  7. Article: Risk assessment of forest disturbance by typhoons with heavy precipitation in northern Japan

    Morimoto, Junko / Aiba, Masahiro / Furukawa, Flavio / Mishima, Yoshio / Yoshimura, Nobuhiko / Nayak, Sridhara / Takemi, Tetsuya / Chihiro, Haga / Matsui, Takanori / Nakamura, Futoshi

    Forest ecology and management. 2021 Jan. 01, v. 479

    2021  

    Abstract: Under future climate regimes, the risk of typhoons accompanied by heavy rains is expected to increase. Although the risk of disturbance to forest stands by strong winds has long been of interest, we have little knowledge of how the process is mediated by ...

    Abstract Under future climate regimes, the risk of typhoons accompanied by heavy rains is expected to increase. Although the risk of disturbance to forest stands by strong winds has long been of interest, we have little knowledge of how the process is mediated by storms and precipitation. Using machine learning, we assess the disturbance risk to cool-temperate forests by typhoons that landed in northern Japan in late August 2016 to determine the features of damage caused by typhoons accompanied by heavy precipitation, discuss how the process is mediated by precipitation as inferred from the modelling results, and delineate the effective solutions for forest management to decrease the future risk in silviculture. In the results, we confirmed two types of behaviours in the model: one represents the same process as that of forest disturbance by strong wind, which has been widely studied, and another represents a unique process mediated by storms and precipitation that has not been previously investigated. Specifically, the ridges that received strong wind from the front side had the highest risk of disturbance. Precipitation increased the probability of disturbance in forest stands, and its effect was dependent on the dominant species composition. Our hypothesis regarding treefall mediated by storms and precipitation is that rainwater flows into the gaps around the tree root systems during sway and the introduction of rainwater below the root-soil plate decreases the root anchorage. The species-specific vulnerability to rainfall may depend on the volume of lateral roots. Modelling the disturbance risk helped us to examine the kinds of factors that were related to exposure and vulnerability that should be managed to effectively decrease the risk of disturbance by typhoons during future uncontrollable hazards. It is recommended to avoid silviculture on the ridges of plateaus considering the high risk estimated in this area. In addition, species with dense lateral roots would be suitable for planting because they may have high resistance to typhoons with heavy precipitation.
    Keywords Japan ; climate ; dominant species ; forest damage ; forest management ; forests ; models ; rain ; risk ; risk assessment ; silviculture ; species diversity ; trees ; wind speed
    Language English
    Dates of publication 2021-0101
    Publishing place Elsevier B.V.
    Document type Article
    Note NAL-AP-2-clean
    ZDB-ID 751138-3
    ISSN 0378-1127
    ISSN 0378-1127
    DOI 10.1016/j.foreco.2020.118521
    Database NAL-Catalogue (AGRICOLA)

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    In stock of ZB MED Bonn / Germany

    Z 6026: Show issues

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  8. Article: Local amplification of storm surge by Super Typhoon Haiyan in Leyte Gulf.

    Mori, Nobuhito / Kato, Masaya / Kim, Sooyoul / Mase, Hajime / Shibutani, Yoko / Takemi, Tetsuya / Tsuboki, Kazuhisa / Yasuda, Tomohiro

    Geophysical research letters

    2014  Volume 41, Issue 14, Page(s) 5106–5113

    Abstract: Typhoon Haiyan, which struck the Philippines in November 2013, was an extremely intense tropical cyclone that had a catastrophic impact. The minimum central pressure of Typhoon Haiyan was 895 hPa, making it the strongest typhoon to make landfall on a ... ...

    Abstract Typhoon Haiyan, which struck the Philippines in November 2013, was an extremely intense tropical cyclone that had a catastrophic impact. The minimum central pressure of Typhoon Haiyan was 895 hPa, making it the strongest typhoon to make landfall on a major island in the western North Pacific Ocean. The characteristics of Typhoon Haiyan and its related storm surge are estimated by numerical experiments using numerical weather prediction models and a storm surge model. Based on the analysis of best hindcast results, the storm surge level was 5-6 m and local amplification of water surface elevation due to seiche was found to be significant inside Leyte Gulf. The numerical experiments show the coherent structure of the storm surge profile due to the specific bathymetry of Leyte Gulf and the Philippines Trench as a major contributor to the disaster in Tacloban. The numerical results also indicated the sensitivity of storm surge forecast.
    Language English
    Publishing date 2014-07-28
    Publishing country United States
    Document type Journal Article
    ZDB-ID 7403-2
    ISSN 0094-8276
    ISSN 0094-8276
    DOI 10.1002/2014GL060689
    Database MEDical Literature Analysis and Retrieval System OnLINE

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