Flash Flood Characteristics
Intensity of floods is the damage caused by it. How much rain over how big of an area constitutes a flash flood.
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A flash flood is a rapid flooding of low-lying areas.
Flash flood characteristics. Characteristics of flash floods in arid regions this presentation overview on the hydrology of arid regions and reviews some publications in that issue. The more the depth of water more will be its volume velocity and its damaging capacity. Flash flood forecasting warning and emergency management are by their nature suitable to cope with the characteristics of flash flood risk Drobot and Parker 2007 Collier 2007.
Flooding that begins within 6 hours and often within 3 hours of the heavy rainfall or other cause. The term flash flood-induced debris flow herein is described as debris flows that are non-fluvial and contain up to 7080 solids in an in-channel process of flash flood. The produced flash flood index map Figure 10 shows that the areas of highest risk are those close to the eastern mountainous ranges followed.
Features such as short warning times rapid rises in water levels high velocities of water waves and debris flows make flash floods extremely dangerous to human lives and properties Creutin et al. Flash floods are defined as those flood events where the rise in water is either during or within a few hours of the rainfall that produces the rise. Therefore flash floods occur within small catchments where the response time of the drainage basin is short.
A questionnaire study and spot investigation were conducted in conjunction with statistical analysis and field research methods. Abstract and Figures Flash floods are one of the most disastrous natural hazards and cause serious loss of life and economic damage every year. A high rate of rise for water also means less preparation time for people in the area.
The North-Western comprising Spain France and Italy and South-Eastern region Israel. Flash floods occur primarily at night and when there is an abundance of atmospheric moisture. In flash flood water level rises and falls quite rapidly with little or no advance warning.
According to the American Meteorology Society AMS flash flooding is a flood that rises and falls quite rapidly with little or no advance warning usually as the result of intense rainfall over a relatively small area But what does that mean. It may be caused by heavy rain associated with a severe thunderstorm hurricane tropical storm or meltwater from ice or snow flowing over ice sheets or snowfields. The deadly nature of flash floods may be largely attributed to the characteristics of flash floods.
This work analyses the prominent characteristics of extreme storms and flash-flood regimes in two main areas of the Mediterranean region. The spatial distribution of flash floods was assessed by using hotspot analysis and the intersection of SEVI and flash flood characteristics were mapped using the cross-tabulation. It can be characterized by depth of inundation volume of inundation velocity of flow and rate of rise of water.
Associated with flash flooding. Flash floods may also occur after the collapse of a natural ice or debris dam or a human structure such as a man-made dam as occurred before the. However these areas are often sparsely populated and data with appropriate resolution to study flash floods phenomena are lacking.
Specific difficulties with flash flood forecasting relate to the short lead times and to the need to provide local and distributed forecast Norbiato et al 2008. The concept of creating this flash flood index is to analyze these characteristics together to derive information about the hydrologic response and flash flood potential inherent to a specific area. Typically flash floods occur in areas where the upstream basin topography is relatively steep and the concentration time of the basin is relatively short.
Events occurring on small spatial scales with short time scales under conditions with rapid production of surface runoff eg intense precipitation or precipitation over highly saturated soils in mountainous terrain. Flash Floods can occur due to Dam or Levee Breaks andor Mudslides Debris Flow. Localized convective rainfall and poor soil development make flash floods a major hazard in these areas with characteristics that are noticeably different from other climates.
Flooding frequently affects many regions in China. Mountainous cities like Fuzhou China usually experience both types. Flash Floods can be caused by a number of things but is most often due to extremely heavy rainfall from thunderstorms.
Washes rivers dry lakes and depressions. Its triggered mechanism is not by landslide-induced mass wasting but by the downcut of channel bed. The frequent extreme weather events have led to dramatic urban waterlogging and flash flood hazards in recent years which result in heavy casualties and serious economic losses.
A flood is an instance where an area that is normally dry land This can happen for a number of reasons. The two areas are chosen to represent the two end members of variation in flash-flood regimes in the Mediterranean basin. Georgakakos and Hudlow 1984.
Flash floods are one of the most disastrous natural hazards and cause serious loss of life and economic damage every year. Flash flood is a flood that occurs quickly often covering an area in minutes or seconds. Flooding frequently affects many regions in China including periodically catastrophic events.
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