Geomorphological Mapping in the Upstreams of Muger River, Using Geospatial Tools
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2010-06
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Abstract
Advancement of GIS and remote sensing, introducing new methodologies and techniques,
has made mapping of large areas manageable with few people. Availability of free and
commercial datasets, software and tools invites researchers to develop new approach to
conduct scientific studies. Advanced Space-born Thermal Emission and Reflection
Radiometer (ASTER) satellite imagery, with high spectral resolution, allows a number of
band combinations and manipulations making the imagery suitable for geomorphological
mapping.
The study area located in the upstream of Muger River, tributary to the Blue Nile River, is
known for its distinct geological setup and active river morphology. Sedimentary rock
seccusions underlying thick tertiary volcanics is exposed to the surface due to the incision of
the Muger River deep in to the highland plateaus. Physiographic zonings of the area made
based on existing datasets helped to develop scientific approach for modification of
lithological map and surface deposit mapping. Enhancements of ASTER satellite imagery
sharpened the boundaries between neighboring lithologies. Surface deposits like Laterite,
Colluvials, Residual Soil, Alluvial Soil and Limonite are mapped using a number of
enhancements.
Composite relief maps stacked from three relief maps of different illumination azimuth
angle allowed mapping of linear features from a single view. Remnants of erosion and their
elevation gave information about depth and volume of erosion. Active river morphology is
detected from aerial photo of two different times. Generally, geomorphological map of the
area is produced and techniques like pan-sharpening using aerial photograph for
geomorphological studies are introduced.
Key words: Geomorphological Mapping, Surface Deposits, Muger River, ASTER image,
Aerial Photograph, River Morphology
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Keywords
Geomorphological Mapping, Surface Deposits, Muger River, ASTER image, Aerial Photograph, River Morphology