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Abstract- İlhan

MICROZONATION WITH RESPECT TO RAINFALL – INDUCED LANDSLIDES

 

Okan İlhan

(Thesis Supervisor: Erdal Şafak & Thesis Co-Advisor: Atilla Ansal)

 

ABSTRACT

Expansion of scientific methodologies to quantify the rainfall – induced hazard paves the way for constructing proper investigation of potential landslide in interested areas. In this context, a simple, concise but sufficiently detailed to incorporate all the phenomena in itself microzonation methodology is proposed which merges two different approaches (1) Iverson (2000), which bears on the exact solution of Richards’ Equation and (2) uniform seepage condition, dependent on topographical features rather than solution to water movement equation in soil continuum. Such a straightforward concept enables utilizers to perform factor of safety calculations not exhaustive but elaborative on GIS system. In this study, hypothetical topography is at first produced to portray the efficacy of recommended algorithm with an intention that different soil conditions and fluctuations in rainfall intensities on soil mass are able to be evaluated. In addition to this, Tekirdağ City Center is selected to examine the pros and cons of proposed routine but all the required parameters for the analysis are specified by means of plenty of empirical correlations, which may lead to unexpected results. Thus, two additional methodology, Montgomery and Dietrich (1994), Mora and Vahrson (1994) are also, employed for the justification of below – stated method since the former one operates on similar parameters and the latter one sketches the potential hazardous locations in relevant area. The outcome of comparison between these three algorithms is able to be interpreted that suggested technique can fairly be presumed as one simulating the pore – pressure acumulations and corresponding factor of safety degradations properly.

 
 
     
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