Landslide Evaluation In Parts of Tarmaber District (Debresina), Central Ethiopia; An Expert Evaluation Approach

International Journal of Geoinformatics and Geological Science

© 2021 by SSRG - IJGGS Journal

Volume 8 Issue 1

Year of Publication : 2021

Authors : Elias Assefa Enigda, T. Suryanarayana

10.14445/23939206/IJGGS-V8I1P103

How to Cite?

Elias Assefa Enigda, T. Suryanarayana, "Landslide Evaluation In Parts of Tarmaber District (Debresina), Central Ethiopia; An Expert Evaluation Approach," SSRG International Journal of Geoinformatics and Geological Science, vol. 8,  no. 1, pp. 15-26, 2021. Crossref, https://doi.org/10.14445/23939206/IJGGS-V8I1P103

Abstract:

The present study was carried out in Tarmaber District, which lies in the Amhara National, Regional state in the North Shoa Zone, Central Ethiopia, about 190 Km from Addis Ababa. The main objective of the present study was to evaluate and to prepare a Landslide Hazard Zonation (LHZ) map of the study area. In the present study to prepare the LHZ map an attempt was made to integrate expert evaluation technique with the statistical method. For this purpose, Slope stability susceptibility evaluation parameter (SSEP) rating scheme was considered. In this technique the rating criteria for various intrinsic and external triggering factors is subjective. Therefore, attempt was made to evolve statistical relation between the past landslide activities in the area and each of the factor class to derive a hazard index. By using this hazard index for each parameter class, the corresponding SSEP ratings were corrected. In an attempt to modify SSEP rating criteria two LHZ maps were thus produced so that a comparison can be made between the LHZ map produced from the SSEP subjective rating criteria and the LHZ map prepared by statistically corrected/modified SSEP criteria. For LHZ map preparation the parameters that were considered are; slope geometry, slope material, structural discontinuities, land use and land cover, groundwater, proximity to streams, seismicity, rainfall and manmade activities. Field observations included inventory mapping of past landslides and facet wise observations and verifications on various parameters. The percent area covered by the high hazard and moderate hazard zones is different in both the approaches. In terms of effectiveness, SSEP method is straight forward and directly it can be applied.

Keywords:

Landslides, Landslide Hazard Zonation (LHZ), Evaluated Landslide Hazard (ELH), Hazard Index

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