الصفحات

الجمعة، 2 فبراير 2018

The use of satellite remote sensing for flood risk management‏ ...


The use of satellite remote sensing for flood risk management‏

Presentata da: Francesca Franci

Coordinatore Dottorato

Prof. Alberto Lamberti

Relatore

Prof. Gabriele Bitelli


Alma Mater Studiorum – Università di Bologna

DOTTORATO DI RICERCA IN

Ingegneria Civile, Ambientale e dei Materiali

Ciclo XXVII

Esame finale anno 2015

Abstract

  Over the last decades the impact of natural disasters to the global environment is becoming more and more severe. The number of disasters has dramatically increased, as well as the cost to the global economy and the number of people affected. Among the natural disaster, flood catastrophes are considered to be the most costly, devastating, broad extent and frequent, because of the tremendous fatalities, injuries, property damage, economic and social disruption they cause to the humankind. In the last thirty years, the World has suffered from severe flooding and the huge impact of floods has caused hundreds of thousands of deaths, destruction of infrastructures, disruption of economic activity and the loss of property for worth billions of dollars.

    In this context, satellite remote sensing, along with Geographic Information Systems (GIS), has become a key tool in flood risk management analysis. 

  Remote sensing for supporting various aspects of flood risk management was investigated in the present thesis. In particular, the research focused on the use of satellite images for flood mapping and monitoring, damage assessment and risk assessment. The contribution of satellite remote sensing for the delineation of flood prone zones, the identification of damaged areas and the development of hazard maps was explored referring to selected cases of study. 

KEYWORDS: Satellite remote sensing Flood risk management Geographic Information System Change detection analysis Object-based classification


CONCLUSIONS

  The use of remote sensing for supporting various aspects of flood risk management was investigated in the present thesis. The research focused on the contribution of satellite images for three main applications: flood mapping and monitoring, flood damage assessment and flood risk assessment. Different geospatial approaches were developed regarding each phase examined. 
In order to evaluate the potential of satellite remote sensing concerning flood prone areas mapping and monitoring, a Landsat time series, comprising five free cloud-cover satellite images, was collected and processed for Dhaka district territory (Bangladesh). 

   The image processing was performed by means of supervised classification technique, to generate multitemporal land-use/cover maps, and change detection procedure to compare them. The map of routinely flooded areas due to the heavy monsoon rains, which typically occur from May to October, was generated. Moreover, it was possible to map and quantify the recession of the water. From the comparison of three multitemporal maps (covering thirteen-year period) the impact of the urban growth and land use/cover changes on the water drainage system was analysed. Despite the lack of ground reference data, the validation procedure performed collecting ground truth points by photointerpretation, confirmed the effectiveness of Landsat images for land use/cover mapping. Moreover, they were found to be a relevant source for supporting flood detection and the monitoring of flood prone areas. The proposed methodology may be applied in other region affected by similar risk and characterized by marked seasonality, if a cloud-free multispectral time series is available.

  The contribution of satellite remote sensing for the damage assessment purpose was investigated for the analysis of extreme floods occurred in Bangladesh in 2004. In this case, the research was performed by processing a Landsat image and an ASTER image in order to provide the pre-event and post-event setting of water bodies respectively. Using overlay operations in GIS environment, the flooded areas were identified and thereafter associated with the administrative divisions and land use data of Bangladesh. The results demonstrated that satellite images, acquired before and after flooding occurrence, could allow to delineate inundated area which can be used along with other geospatial data, to support damage assessment and vulnerability analyses, which are essential for developing protective actions and mitigation plans against the flood risk. 

  Finally, the research focused on the use of remote sensing data for producing flood hazard maps. In this case, the study was conducted on a portion of Yialias river basin (Cyprus), often affected by flash flood. A Multi-Criteria Analysis (MCA), assisted by GIS, was performed to produce the hazard zoning map of the study area. Five flood-causing factors depending on the available data were considered: slope, distance to main channels, drainage texture land use and geology. The Analytic Hierarchy Process (AHP) technique was used for deriving the weight of each criterion in the computation of the Flood Hazard Index (FHI); then, FHI values were associated to seven hazard categories to generate easily-readable flood hazard map. Except for the geological map, the factors layers were obtained by processing a GeoEye-1 image and the Digital Elevation Model (DEM). In particular, the GeoEye- 1 was classified using an object-based technique to extract land use/cover data, while geoprocessing tools in GIS environment were used to obtain the other factors from the DEM. This case study demonstrated the effectiveness and the benefit of using remote sensing data to provide valuable information concerning the hazard assessment when several data are not available. Furthermore, the MCA/AHP approach was found to be a fast and cost effective way to use remote sensing techniques, coupled with GIS, for constructing flood hazard map. It offers a flexible, step-by-step and transparent way for analysing and understanding spatial phenomena.
Natural flood disaster is common and cannot be stop. The research results highlighted the high potential of remote sensing techniques in providing valuable and objective data for flood risk management activities, relating to the identification of inundated areas, the monitoring of flood prone territory and the damage assessment after an event.











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