INFLUENCE OF DEM IN WATERSHED MANAGEMENT AS FLOOD ZONATION MAPPING
| Autor: | Muhamad Alrajhi, Mohammad Afroz Khan, Abdalla Alobeid, Mudasir Khan |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
lcsh:Applied optics. Photonics
Watershed Geospatial analysis 010504 meteorology & atmospheric sciences 0208 environmental biotechnology Population 02 engineering and technology computer.software_genre 01 natural sciences lcsh:Technology Flash flood Digital elevation model education 0105 earth and related environmental sciences Hydrology education.field_of_study Flood myth business.industry lcsh:T Environmental resource management Elevation lcsh:TA1501-1820 020801 environmental engineering Watershed management Geography lcsh:TA1-2040 business lcsh:Engineering (General). Civil engineering (General) computer |
| Zdroj: | The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XLI-B8, Pp 3-10 (2016) |
| ISSN: | 2194-9034 |
| DOI: | 10.5194/isprsarchives-xli-b8-3-2016 |
| Popis: | Despite of valuable efforts from working groups and research organizations towards flood hazard reduction through its program, still minimal diminution from these hazards has been realized. This is mainly due to the fact that with rapid increase in population and urbanization coupled with climate change, flood hazards are becoming increasingly catastrophic. Therefore there is a need to understand and access flood hazards and develop means to deal with it through proper preparations, and preventive measures. To achieve this aim, Geographical Information System (GIS), geospatial and hydrological models were used as tools to tackle with influence of flash floods in the Kingdom of Saudi Arabia due to existence of large valleys (Wadis) which is a matter of great concern. In this research paper, Digital Elevation Models (DEMs) of different resolution (30m, 20m,10m and 5m) have been used, which have proven to be valuable tool for the topographic parameterization of hydrological models which are the basis for any flood modelling process. The DEM was used as input for performing spatial analysis and obtaining derivative products and delineate watershed characteristics of the study area using ArcGIS desktop and its Arc Hydro extension tools to check comparability of different elevation models for flood Zonation mapping. The derived drainage patterns have been overlaid over aerial imagery of study area, to check influence of greater amount of precipitation which can turn into massive destructions. The flow accumulation maps derived provide zones of highest accumulation and possible flow directions. This approach provide simplified means of predicting extent of inundation during flood events for emergency action especially for large areas because of large coverage area of the remotely sensed data. |
| Databáze: | OpenAIRE |
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