Urban flood risk assessment based on Source-Pathway-Receptor(SPR) conceptual in Futian district, Shenzhen City
Abstract
Flooding is one of the leading threats of natural disasters to human life and property, especially in densely populated urban areas. Urbanization is major achievement in last fifty years around world, which result in a great change on the ground and a rapid growth in urban assets and population. As a result, urban areas has decreasing permeability and unresponsive engineering. It is increasingly severe of urban flood damage loss in the progress of Urbanization. The transformation of land is general characteristic of social development. This lead to the change in physical environment. It's extremely difficult to develop a comprehensive understanding of system elements and their relationships. Previous research generally assessed flood disaster risk through Drive-Pressure-State-Impacts-Response(DPSIR). But this assessment model refer to a subjective index system and give comprehensive evaluation value. This study use Source-Pathway-Receptor(SPR) to describe state of flood disaster system. This paper takes Futian district, Shenzhen City as study area, utilize this model to exact the land-use elements in urban areas. We found that risk source in the areas refer to the easily flood prone elements and it always occur in the low point of urban street. It forms water accumulation in the street if the precipitation exceed the bearing capacity of pipeline network. Thus the risk of street is bigger than other elements in the region. The risk of waterlogging is gradually transferred to the surrounding elements through pathway, centering on the easily accumulated water points on the road. There also some areas which was lower terrain in green land was flooded by waterlogging. Because it has But these areas have no buildings and low population density, the risk is smaller than other land-use elements. Risk pathways usually point to streets from different elements, and when streets risk increase, they spread the risk generally to receptors(ex. Buildings) around those. Rapid and early warning risk assessment of the flooded areas is key to supporting emergency-response planning and providing damage assessment in both spatial and temporal measurements.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2019
- Bibcode:
- 2019AGUFMNH13A..06S
- Keywords:
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- 4333 Disaster risk analysis and assessment;
- NATURAL HAZARDS;
- 4335 Disaster management;
- NATURAL HAZARDS;
- 6309 Decision making under uncertainty;
- POLICY SCIENCES;
- 6334 Regional planning;
- POLICY SCIENCES