Flash flood is one of the major meteorological disasters on the Tibet Plateau (TP). Flash flood risk regionalization based on the theory of flash flood occurrence risk is the essential basis for relative risk manageme...Flash flood is one of the major meteorological disasters on the Tibet Plateau (TP). Flash flood risk regionalization based on the theory of flash flood occurrence risk is the essential basis for relative risk management. The flash flood risk regionalization and the high-resolution grid mountain flood risk level in TP is carried out by using ArcGIS with the indicators of rainfall, days of heavy rain, vegetation cover, slope, relative elevation difference, river network density, population density, average GDP and traffic density. The areas with high mountain flood risk are mainly located in the middle and downstream of Yarlung, the Nujiang River Valley, the Jinsha River and Lancang River Basin. Besides, the results of flash flood disaster risk regionalization were tested by using historical flash flood disaster data and calamity census data. The disasters occurred in high-risk and sub-high-risk regions are accounted for 73%. Flash floods that cause casualties and economic losses of more than 100,000 CNY (Chinese Yuan) occurred in high-risk areas. Flash flood risk assessment may provide reference for the prevention and control of geological disasters in TP, improve disaster prevention and mitigation capabilities, reduce the hazards of flash floods to social development.展开更多
In the context of climate change,the impact of extreme precipitation and its chain effects has intensified in the southeastern coastal region of China,posing a serious threat to the socioeconomic development in the re...In the context of climate change,the impact of extreme precipitation and its chain effects has intensified in the southeastern coastal region of China,posing a serious threat to the socioeconomic development in the region.This study took tropical cyclones–extreme precipitation–flash floods as an example to carry out a risk assessment of flash floods under climate change in the Yantanxi River Basin,southeastern China.To obtain the flash flood inundation characteristics through hydrologic–hydrodynamic modeling,the study combined representative concentration pathway(RCP)and shared socioeconomic pathway(SSP)scenarios to examine the change of flash flood risk and used the geographical detector to explore the driving factors behind the change.The results show that flash flood risk in the Yantanxi River Basin will significantly increase,and that socioeconomic factors and precipitation are the main driving forces.Under the RCP4.5-SSP2 and RCP8.5-SSP5 scenarios,the risk of flash floods is expected to increase by 88.79%and 95.57%,respectively.The main drivers in the case study area are GDP density(q=0.85),process rainfall(q=0.74),asset density(q=0.68),and population density(q=0.67).The study highlights the influence of socioeconomic factors on the change of flash flood disaster risk in small river basins.Our findings also provide a reference for regional planning and construction of flood control facilities in flash flood-prone areas,which may help to reduce the risk of flash floods.展开更多
This research analyzed interventions of State Fire Service(SFS)units in the Wielkopolska region of Poland that were triggered by extreme precipitation for the period 2010-2021.Our results demonstrated that the most po...This research analyzed interventions of State Fire Service(SFS)units in the Wielkopolska region of Poland that were triggered by extreme precipitation for the period 2010-2021.Our results demonstrated that the most populated and urbanized towns in the Wielkopolska(Greater Poland,west of Warsaw)region are at the most risk in the event of extreme precipitation occurrence as measured by the total number of interventions made by the SFS.The number of SFS unit interventions in towns,standardized to 10,000 inhabitants,indicates that the highest proportional volume of interventions also occurred in smaller towns.In the rural municipalities the number of SFS unit interventions increases along with higher population density and proportion of infrastructure areas.As analyzed in this study,the 12 years from 2010 to 2021 were characterized by a higher number of days with heavy precipitation,for example,20,30,40,and 50 mm,in comparison to the previous periods 1961-2010 and 1981-2010.Intervention databases collected by emergency services are a valuable source of information for hazard mapping.Based on those and other available data,a statistical model was created and factors influencing the local and regional occurrence of interventions were determined.Increasing suburbanization,the rising proportion of impermeable surfaces,and the impact of climate change are of considerable importance in urban flood risk.It is necessary to help municipalities develop abilities to absorb larger amounts of rainwater.展开更多
文摘Flash flood is one of the major meteorological disasters on the Tibet Plateau (TP). Flash flood risk regionalization based on the theory of flash flood occurrence risk is the essential basis for relative risk management. The flash flood risk regionalization and the high-resolution grid mountain flood risk level in TP is carried out by using ArcGIS with the indicators of rainfall, days of heavy rain, vegetation cover, slope, relative elevation difference, river network density, population density, average GDP and traffic density. The areas with high mountain flood risk are mainly located in the middle and downstream of Yarlung, the Nujiang River Valley, the Jinsha River and Lancang River Basin. Besides, the results of flash flood disaster risk regionalization were tested by using historical flash flood disaster data and calamity census data. The disasters occurred in high-risk and sub-high-risk regions are accounted for 73%. Flash floods that cause casualties and economic losses of more than 100,000 CNY (Chinese Yuan) occurred in high-risk areas. Flash flood risk assessment may provide reference for the prevention and control of geological disasters in TP, improve disaster prevention and mitigation capabilities, reduce the hazards of flash floods to social development.
基金supported by the National Key Research and Development Program(2017YFA0604903,2017YFC1502505)。
文摘In the context of climate change,the impact of extreme precipitation and its chain effects has intensified in the southeastern coastal region of China,posing a serious threat to the socioeconomic development in the region.This study took tropical cyclones–extreme precipitation–flash floods as an example to carry out a risk assessment of flash floods under climate change in the Yantanxi River Basin,southeastern China.To obtain the flash flood inundation characteristics through hydrologic–hydrodynamic modeling,the study combined representative concentration pathway(RCP)and shared socioeconomic pathway(SSP)scenarios to examine the change of flash flood risk and used the geographical detector to explore the driving factors behind the change.The results show that flash flood risk in the Yantanxi River Basin will significantly increase,and that socioeconomic factors and precipitation are the main driving forces.Under the RCP4.5-SSP2 and RCP8.5-SSP5 scenarios,the risk of flash floods is expected to increase by 88.79%and 95.57%,respectively.The main drivers in the case study area are GDP density(q=0.85),process rainfall(q=0.74),asset density(q=0.68),and population density(q=0.67).The study highlights the influence of socioeconomic factors on the change of flash flood disaster risk in small river basins.Our findings also provide a reference for regional planning and construction of flood control facilities in flash flood-prone areas,which may help to reduce the risk of flash floods.
基金supported by the National Science Centre of Poland(Project No.2018/31/B/HS4/03223)。
文摘This research analyzed interventions of State Fire Service(SFS)units in the Wielkopolska region of Poland that were triggered by extreme precipitation for the period 2010-2021.Our results demonstrated that the most populated and urbanized towns in the Wielkopolska(Greater Poland,west of Warsaw)region are at the most risk in the event of extreme precipitation occurrence as measured by the total number of interventions made by the SFS.The number of SFS unit interventions in towns,standardized to 10,000 inhabitants,indicates that the highest proportional volume of interventions also occurred in smaller towns.In the rural municipalities the number of SFS unit interventions increases along with higher population density and proportion of infrastructure areas.As analyzed in this study,the 12 years from 2010 to 2021 were characterized by a higher number of days with heavy precipitation,for example,20,30,40,and 50 mm,in comparison to the previous periods 1961-2010 and 1981-2010.Intervention databases collected by emergency services are a valuable source of information for hazard mapping.Based on those and other available data,a statistical model was created and factors influencing the local and regional occurrence of interventions were determined.Increasing suburbanization,the rising proportion of impermeable surfaces,and the impact of climate change are of considerable importance in urban flood risk.It is necessary to help municipalities develop abilities to absorb larger amounts of rainwater.
