توظيف تكاملي لتقنيات الاستشعار من بعد و نظم المعلومات الجغرافية لتحديد و تحليل الخصائص الهيدرومورفومترية لأحواض التصريف الصحراوية

الملخص EN

Remote sensing (RS), GIS techniques and statistical analysis were used to extract and analyze DEM and conventional morphometric characteristics.

The morphometric characteristics such as stream length, number of streams, bifurcation ratio, density of streams per unit drainage area, relief, slope, and perimeter and area of drainage basin for the Selhya basin were extracted and analyzed.

Hack's law, fractal analysis and grain size analysis of bed sediments were also done.

The analysis illustrates the association between stream patterns and hydrological factors.

The stream network in the basin is shown to have statistical space-filling properties, due to free geologic and geomorphometric constrains.

Geological and hydrological interpretations suggest that bedrock topography, and lithology are homogenous throughout the basin area, which lead to the conclusion that hydrological factors related to flood recurrence and magnitudes are the main factors influencing the evolution of stream channels in the basin.

A slope failure, or a major avalanche in the Uroma escarpment had changed the base level of the basin, which initiated a climbing wave of degradation migrating up-stream.

Flood effectiveness, flood frequency, and nature of flood curve are among hydrological variables that can be inferred from morphometric analysis.