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Flood Loss Model Model GIROJ FloodGIROJ Loss Flood Loss Model Model General Insurance Rating Organization of Japan 2 Overview of Our Flood Loss Model GIROJ flood loss model includes three sub-models. Floods Modelling Estimate the loss using a flood simulation for calculating Riverine flooding*1 flooded areas and flood levels Less frequent (River Flood Engineering Model) and large- scale disasters Estimate the loss using a storm surge flood simulation for Storm surge*2 calculating flooded areas and flood levels (Storm Surge Flood Engineering Model) Estimate the loss using a statistical method for estimating the Ordinarily Other precipitation probability distribution of the number of affected buildings and occurring disasters related events loss ratio (Statistical Flood Model) *1 Floods that occur when water overflows a river bank or a river bank is breached. *2 Floods that occur when water overflows a bank or a bank is breached due to an approaching typhoon or large low-pressure system and a resulting rise in sea level in coastal region. 3 Overview of River Flood Engineering Model 1. Estimate Flooded Areas and Flood Levels Set rainfall data Flood simulation Calculate flooded areas and flood levels 2. Estimate Losses Calculate the loss ratio for each district per town Estimate losses 4 River Flood Engineering Model: Estimate targets Estimate targets are 109 Class A rivers. 【Hokkaido region】 Teshio River, Shokotsu River, Yubetsu River, Tokoro River, 【Hokuriku region】 Abashiri River, Rumoi River, Arakawa River, Agano River, Ishikari River, Shiribetsu River, Shinano River, Sekikawa River, Shiribeshi-toshibetsu River, Himekawa River, Kurobe River, Mukawa River, Saru River, Joganji River, Jinzu River, Kushiro River, Tokachi River Shogawa River, Oyabe River, Tedori River, Kakehashi River 【Chugoku region】 【Kinki region】 【Tohoku region】 Sendai River, Tenjin River, Yura River, Yodo River, Iwaki River, Takase River, Hino River, Hii River, Yamato River, Maruyama River, Mabechi River, Kitakami River, Gonokawa River, Takatsu River, Kakogawa River, Ibo River, Naruse River, Natori River, Yoshii River, Asahi River, Kinokawa River, Shingu River, Abukuma River, Yoneshiro River, Takahashi River, Ashida River, Kuzuryu River, Kitakawa River Omono River, Koyoshi River, Ota River, Oze River, Saba River Mogami River, Akagawa River 【Kyushu region】 【Kanto region】 Onga River,Yamakuni River, Kuji River, Naka River, Chikugo River, Yabe River, Tone River, Arakawa River, Matsuura River, Rokkaku River, Tama River, Tsurumi River, Kase River, Honmyo River, Sagami River, Fuji River Kikuchi River, Shirakawa River, Midori River, Kuma River, Oita River, Ono River, 【Shikoku region】 【Chubu region】 Banjo River, Gokase River, Yoshino River, Naka River, Kano River, Abe River, Oi River, Kikugawa River, Omaru River, Oyodo River, Doki River, Shigenobu River, Tenryu River, Toyogawa River, Yahagi River, Sendai River, Kimotsuki River Hijikawa River, Monobe River, Shonai River, Kiso River, Suzuka River, Niyodo River, Watari River Kumozu River, Kushida River, Miyagawa River * For Tone River, Arakawa River, Tsurumi River, Shonai River, and Yodo River, GIROJ’s flood simulation results are used for risk estimate. For the other rivers, flood simulation results by the Ministry of Land, Infrastructure, Transport and Tourism are used for risk estimate. 5 River Flood Engineering Model: 1. Estimate Flooded Areas and Flood Levels Calculate flooded areas and flood levels using the flood simulation (1) It rains. (2) Rainwater flows down Set rainfall data the river. (3) The bank gives way. (1) It rains. (Rainfall pattern data) Bank (2) Rainwater flows down the river. River channel (River channel data) (4) The floodwater spreads. (3) The bank gives way. (Bank data) Flooded area (protected (Arrows indicate the direction of water (4) The floodwater spreads. lowland) flow.) (Altitude data) Bank breaking point Calculate flooded areas and flood levels * Enter heavy, once-in-200-year rainfall data or the like in Calculated result for flooded areas (1). and flood levels * Data inside the parentheses are mainly used. Ｌｏｗ High 6 River Flood Engineering Model: 2. Estimate Losses For the flooded areas and flood levels calculated using the flood simulation, determine the loss ratio for each district per town using a relationship formula between flood levels and loss ratio, and estimate the loss from insurance policy data 1. Estimate Flooded Areas and Flood Levels Calculate flooded areas and flood levels 600 2. Estimate Losses 1st floor Relationship formula between flood levels (cm) and loss ratio ceiling level Flood 1st floor Calculate the loss ratio for each district per town height 0 0 80 0 Loss ratio (%) 100 Insurance policy data Estimate losses 7 Overview of Storm Surge Flood Engineering Model 1. Estimate Flooded Areas and Flood Levels Simulated typhoon*1 Storm surge flood simulation Calculate the amount of rise in tide level Calculate flooded areas and flood levels 2. Estimate Losses * Same as River Flood Engineering Model Calculate the loss ratio for each district per town Estimate losses *1 A typhoon generated by a simulation that is used in GIROJ‘s typhoon loss model 8 Storm Surge Flood Engineering Model: Estimate targets Estimate targets are Tokyo Bay, Ise Bay, and Osaka Bay that adjoin the three largest metropolitan areas. Osaka Bay Tokyo Bay Ise Bay 9 Storm Surge Flood Engineering Model: 1. Estimate Flooded Areas and Flood Levels By the storm surge flood simulation, calculate the amount of rise in tide level (sea level) for each typhoon (Simulated typhoon) generated using GIROJ’s typhoon loss model. Calculated result for the amount of rise Simulated in tide level typhoon Simulated typhoon (a) Wind-driven surge: A rise in sea level due to strong typhoon winds (b) Pressure-driven surge: A rise in sea level due to a decrease in atmospheric pressure caused by the typhoon Ｌｏｗ High Astronomical tide level*1 (a) Wind-driven surge Calculate the amount of rise in tide level (b) Pressure- driven surge Normal sea level *1 Amount of periodic changes in sea level under the action of gravity of the moon and sun 10 Storm Surge Flood Engineering Model: 1. Estimate Flooded Areas and Flood Levels Calculate the amount of seawater inundating land based on the rise in tide level and how the seawater spreads on land, thereby determining flooded areas and flood levels. Calculated result for the amount of rise Simulated in tide level typhoon Calculate the amount of rise in tide level (1) Seawater inundates land. (Bank data) (2) The floodwater spreads. (Altitude data) Calculated result for flooded areas and flood levels Calculate flooded areas and flood levels * Data inside the parentheses are mainly used. Ｌｏｗ High 11 Storm Surge Flood Engineering Model: 2. Estimate Losses For the flooded areas and flood levels calculated using the storm surge flood simulation, determine the loss ratio for each district per town using a relationship formula between flood levels and loss ratio, and estimate the loss from insurance policy data 1. Estimate Flooded Areas and Flood Levels Calculate flooded areas and flood levels 600 2. Estimate Losses (cm) 1st floor Relationship formula between flood levels and loss ratio ceiling level Flood 1st floor Calculate the loss ratio for each district per town height 0 0 80 0 Loss ratio (%) 100 Insurance policy data Estimate losses 12 Overview of Statistical Flood Model 1. Estimate Probability Distribution Statistical data, such as the number Statistical data on insurance payment*2 of affected buildings*1 Estimate the probability distribution of the annual frequency Estimate the probability distribution and *3 number of affected buildings for each disaster of loss ratio 2. Estimate Losses Estimate losses *1 Flood Damage Statistics Survey (Ministry of Land, Infrastructure, Transport and Tourism) or the like is used. *2 Fire insurance statistics (General Insurance Rating Organization of Japan) is used. *3 Loss ratio = amount of loss / insured value 13 Statistical Flood Model: 1. Estimate Probability Distribution (about distribution of the annual frequency and number of affected buildings for disasters) 1 Based on statistical data on the number of affected buildings or the like, estimate the probability distribution of the annual frequency and number of affected buildings for each disaster with respect to each of the seven disaster types (typhoons, rainy season, heavy rain, wind and waves, thaw, landslides, and other extraordinary disasters) Schematic diagram for estimation of distribution of the annual frequency and number of affected buildings for disasters Number of Seven types ・・・ affected buildings of disasters Number of Rainy season affected buildings Number of Statistical data, such as the number Typhoon affected buildings 19xx TyphoonA of affected buildings TyphoonB 19xy TyphoonC Classify into seven Annual frequency ・・・ Number of affected disaster types buildings per event 20xz TyphoonD based on disaster names Seven types of disasters ・・・ Estimate the probability distribution Rainy season of the annual frequency and Typhoon number of affected buildings for each disaster Probability distribution of Probability distribution of number annual frequency of affected buildings per event Probability Probability density density Annual frequency Number of affected buildings per event 14 Statistical Flood Model: 1. Estimate Probability Distribution (about distribution of loss ratio) Estimate the probability distribution of loss ratio common to all disaster types based on statistical data on insurance payment
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