Flood hazard mapping and assessment of precipitation monitoring system using gis-based morphometric analysis and trmm data: a case study of the wadi qena watershed, egypt
Wadi Qena is one of the Nile Valley areas particularly at risk of severe flash flooding, located
in Egypt. The study aims to verify TRMM rainfall data (TRMM 3B42), using eight stations
across Egypt as well as relies on morphometric analysis to generate a flood risk map based on the
ranking method. Three process could be recognized through the study, calibration, correction and
verification processes. The results discuss the match daily rainfall trends of TRMM and observed
data, producing a correction equation for TRMM data with root mean square error (RMSE) value
of 0.837 mm d-1 and R2
= 0.238 (calibration process). On the other hand, a verification process,
using the developed correction equation, obtain RMSE value of 1.701 mm d-1 and R2
= 0.601.
The morphometric analysis shows 32 sub-basins with a hazard degree from moderate to high,
amounting to 50.3% of the watershed area. Conclusively, this study confirms that the current
monitoring system is not enough to cover the whole area, especially the high-risk sub-basins, and
TRMM data could provide key information for water-related applications in Egypt.
Keywords
TRMM data; Flood hazard; Morphometric parameters; Wadi Qena; Monitoring system