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            GADRI letter: How will risks and disaster research help us overcome COVID-19?

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            Study addresses flash flooding due to extended and heavy rains in Santiago

            Study addresses flash flooding due to extended and heavy rains in Santiago

            Rio Maipo wetland: “Front Line” of protection against extreme waves, storms and tsunamis on the coast

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Study addresses flash flooding due to extended and heavy rains in Santiago

Cristian Escauriaza, UC academic, and María Teresa Contreras from the University of Notre Dame, both researchers from the Research Center for Integrated Disaster Risk Management (CIGIDEN by its initials in Spanish), developed a numerical model to understand the effects of varying amounts of sediment transported on the floods and their impact on the eastern urban areas of the capital.

10 July, 2020
in Dissemination, L2. Surface water processes and associated hazards, News
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“Flash floods are born from prolonged and/or heavy rainfall that the soil cannot absorb. With this premise, María Teresa Contreras of the University of Notre Dame, and Cristián Escauriaza of the Pontificia Universidad Católica de Chile, both from the Integrated Disaster Risk Management Research Centre (CIGIDEN), carried out a modeling study of the sediment concentration effects due to sudden floods in the Andean basin of the Metropolitan Region, the Ramón gully.

The study published in the scientific journal Natural Hazards and Earth System Sciences, replicated at the international site Geobites and supported by the American Geophysical Union, involved the development of a numerical model and simulations to understand the effects of different amounts of sediment transported in flash flooding. This allows us to visualize the impact on the speed, depth, extent, and force of the flood in the eastern urban area of Santiago.

“Simulations of rapid floods in these basins are particularly challenging, due to the complex morphology, insufficient hydrometeorological data, and the uncertainty posed by the sediment concentration variability in the studied area. High concentrations produced by hillside erosion, and stream formed by overland flow in areas with steep slopes and low vegetation cover, can significantly change the flow dynamics as flooding spreads in the stream,” the researchers explain in the paper.

Sediments and slopes

For the numerical model, data from the storms of the last few years in the Metropolitan Region were used, along with the intense rainfall that can cause large-scale flash flooding in Santiago, considering sediment amount, the slope of the gully, as well as the volume and width of the flow in the watercourse, responsible for causing a flash flood.

While conducting the simulations, experts found that the flow velocity in the lower section of the channel was reduced by up to 70%, as the sediment amount in the flood increased. This slowdown led to two effects: greater flood depths (about 60 centimeters), as well as more extensive floodings in Santiago. Besides, the flood force in the urban area increased by an average of 14.5%, leading to a maximum generated force of almost 70 tons, which can put housing and other critical infrastructure downstream at risk.

Finally, the study aimed to provide evidence to improve risk assessment, urban planning, and early warning systems in urban areas near mountain gullies affected by flash flooding.

 

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  • Announcements
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  • ABOUT US
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      • RESEARCHERS
      • SUPPORT STAFF
      • POSTDOCTORAL
    • EXPERT GUIDE 2020
  • RESEARCH
      • L1. Solid Earth Processes and Associated Hazards
      • L2. Surface Water Processes and Associated Hazards
      • L3. Risk and Resilience of Complex Systems and Networks
      • L4. Disaster Cultures and Risk Governance
      • L5. Socio-Economic Assessment of disasters and Mitigation Strategies for Resilient Critical Infrastructure Systems
      • L6. Citizen governance
  • SCIENCE COMMUNICATION
      • NEWS
          • CIGIDEN discussion series will address Disaster Risk Management in a pandemic context

            CIGIDEN discussion series will address Disaster Risk Management in a pandemic context

            Scientific analysis identifies communes with more rain damage in Santiago’s urban areas

            Scientific analysis identifies communes with more rain damage in Santiago’s urban areas

            GADRI letter: How will risks and disaster research help us overcome COVID-19?

            GADRI letter: How will risks and disaster research help us overcome COVID-19?

            Researchers identify worst-affected communes by economic risks of COVID-19

            Researchers identify worst-affected communes by economic risks of COVID-19

            Study addresses flash flooding due to extended and heavy rains in Santiago

            Study addresses flash flooding due to extended and heavy rains in Santiago

            Rio Maipo wetland: “Front Line” of protection against extreme waves, storms and tsunamis on the coast

            Rio Maipo wetland: “Front Line” of protection against extreme waves, storms and tsunamis on the coast

      • IN THE MEDIA
          • UC supports chañaral reconstruction: Learn about the contributions the institution has made in Atacama

            UC supports chañaral reconstruction: Learn about the contributions the institution has made in Atacama

      • SOCIAL MEDIA GRAPHICS AND VIDEOS
          • Terremoto en México (en)

            Terremoto en México (en)

      • COLUMNS
          • Chile and Covid-19: we start from scratch

            Chile and Covid-19: we start from scratch

            How to govern a disaster? Dialogue, collaboration and democracy

            How to govern a disaster? Dialogue, collaboration and democracy

            Everyone should act as if we already have the virus

            Everyone should act as if we already have the virus

            Tsunami vertical evacuation should be an option in Chile

            Tsunami vertical evacuation should be an option in Chile

            Waterspouts, disasters and ecological culture

            Waterspouts, disasters and ecological culture

            ¡Welcome to Chile Greta!

            ¡Welcome to Chile Greta!

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