استخدام صور الاستشعار عن بعد الرقمية عالية الوضوح المكاني لتحديد امتداد فيضانات السيول في سهل الخرج

الملخص EN

As the desert cities expand, mapping the extent of areas affected by the flashflood is critical for the planners, engineers and policy makers.

SPOT-5 with its higher spatial resolution capability and repetitive coverage, offers a distinctive new way to monitor and assess this problem.

This study aims at mapping the expansion of the desert flashflood that inundated Al-Kharj plain and affected the northern suburbs of the Al-Kharj city in December 2003.

Multispectral data (10m) were digitally merged with the high spatial resolution data (2.5m) in order to increase the visual content of the images.

This process allowed more fine features such as channels, levees, roads and artificial canals to be easily identified and mapped.

Change detection and principal components analysis techniques were also applied to identify the pre-flood and post-flood spectral differences of the wadi's soil.

The result was presented in the form of a thematic map produced by the supervised classification technique.

It divides the flood-prone area into three categories; none, partially and full inundated areas.