Title

Slope Stability as a Function of Lithology in the Gorge of the Nile, Ethiopia

Presenter Information

Alfred Massey Jr.

Department

Geosciences and Geological and Petroleum Engineering

Major

Geological Engineering

Research Advisor

Abdel Salam, Mohamed G.

Advisor's Department

Geosciences and Geological and Petroleum Engineering

Funding Source

NSF; Missouri S&T Geological Sciences and Engineering

Abstract

The purpose of this study is to examine slope stability in relation to lithology in a segment of the Gorge of the Nile in Ethiopia. This ~1.4 km gorge exposes ~1.1 km thick Mesozoic sedimentary rocks at the base followed by ~0.3 km thick Cenozoic basaltic rocks. The base of the sedimentary section is dominated by sandstone exposures, its central part is characterized by exposures of shale and gypsum units, and its upper part is where limestone units are found. Analysis of Digital Elevation Model (DEM) extracted from the Shuttle Radar Topography Mission (SRTM) data shows that the basaltic rocks are characterized by 0 to10 degrees slope and most of the sedimentary rocks have 10- 20 degrees slope with the exception of the upper and lower parts of the limestone where slopes ranging between 60 and 70 degrees are found. These steep slopes are characterized by rockslides and debris slides whereas the gentle slopes are dominated by frequent occurrence of earth flow. The nearly flat tops of the basaltic rocks are the most stable parts of the Gorge of the Nile.

Biography

Alfred is a junior majoring in Geological Engineering at Missouri University of Science and Technology. He transferred from Metropolitan Community College in Kansas City Missouri where he was born and raised with an emphasis in engineering basics and plans to become a professional geotechnical engineer.

Research Category

Engineering

Presentation Type

Poster Presentation

Document Type

Poster

Location

Upper Atrium/Hallway

Presentation Date

06 Apr 2011, 1:00 pm - 3:00 pm

Comments

Joint project with Ahmed Elshiekh

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Apr 6th, 1:00 PM Apr 6th, 3:00 PM

Slope Stability as a Function of Lithology in the Gorge of the Nile, Ethiopia

Upper Atrium/Hallway

The purpose of this study is to examine slope stability in relation to lithology in a segment of the Gorge of the Nile in Ethiopia. This ~1.4 km gorge exposes ~1.1 km thick Mesozoic sedimentary rocks at the base followed by ~0.3 km thick Cenozoic basaltic rocks. The base of the sedimentary section is dominated by sandstone exposures, its central part is characterized by exposures of shale and gypsum units, and its upper part is where limestone units are found. Analysis of Digital Elevation Model (DEM) extracted from the Shuttle Radar Topography Mission (SRTM) data shows that the basaltic rocks are characterized by 0 to10 degrees slope and most of the sedimentary rocks have 10- 20 degrees slope with the exception of the upper and lower parts of the limestone where slopes ranging between 60 and 70 degrees are found. These steep slopes are characterized by rockslides and debris slides whereas the gentle slopes are dominated by frequent occurrence of earth flow. The nearly flat tops of the basaltic rocks are the most stable parts of the Gorge of the Nile.