Browsing by Author "Tadesse, Tariku"

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    Dam Break Analysis and Risk Assessment [A Case Study of Tendaho Dam]
    (Addis Ababa, 2015-12) Tadesse, Tariku; Kemal, Asie(PhD)
    This thesis analyzes the probable failure of a dam under a set of pre-defined scenarios, within the framework of a case study, the case subject being the Tendaho dam located at Afar Region of Ethiopia. The failure of the dam is not analyzed neither structural nor hydraulic wise but, is assumed to be triggered when certain critical WSELs are exceeded. Hence, the analyses focused on the aftermath of the failure and strive to anticipate the level of inundation at downstream of the dam itself. Break parameters prediction, peak outflow prediction were shown as the essential for the dam break analysis and eventually determined the loss of the life. Tendaho dam break was further modeled and analyzed using USACE Hydrologic Engineering Center’s River Analysis System (HEC-RAS Version 4.1) model based on available technical and geometric data. Water surface elevations and discharges occurring at downstream of the Tendaho dam were predicted spatially and temporally under the defined set of eleven scenarios. Eight of the scenarios were analyzed for overtopping failure of the dam. Two of the scenarios were analyzed for piping failure and the last scenario was analyzed to investigate the sensitivity of Manning roughness. Overtopping failure yielded more severe flow conditions at downstream. The worst case scenario was found to be scenario W4 (when all the three spillway gates are completely closed). Hence, indicative inundation map and settlements under risk were identified. Total numbers of fatalities for precise and vague understanding of warnings were found 1,012 and 2,972 respectively. The thesis study further addressed some available pre-event measures that may be taken in advance. Keywords: Tendaho Dam, HEC-RAS, HEC-GeoRAS, Breach, Dam Failure, Dam Break Analysis
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    Effect of Reward System on Job Satisfaction: The Case of Ethiopian Sugar Corporation
    (Addis Ababa University, 2016-06) Tadesse, Tariku; Beyene, Abeba (PhD)
    The research study achieved its aims of defining and assessing the effect of reward system on job satisfaction in Ethiopian Sugar Corporation Addis Ababa-Ethiopia. The purpose is to examine the effect of reward systems on the dimensions of employees’ job satisfaction. This study also attempted to investigate what types of reward system financial or non-financial contribute to the employee job satisfaction. Both qualitative and quantitative research methods were applied. In order to select the respondents from the total population of 380 stratified sampling method were applied the sample size determination come with 171 sample to be taken in to the study. Spector (1997) Employee Job satisfaction survey(JSS) which measure employees’ job satisfaction dimensions and Cammann, Fichman, Jenkins Klesh (1979) and The Michigan Organizational Assessment Questionnaire were applied to . Survey data collected from respondents analyzed using descriptive, correlation and regression analysis. The findings of the study indicated that there was a significant relationship between financial and non-financial rewards with employees’ job satisfaction. The financial reward component payment positively and significantly influenced job satisfaction of employees’ working in the case organization. The findings of the study revealed that nature of the job and working condition has strong effect on employees’ job satisfaction as a result. Finally, it is the recommendations of the research study that reward systems have an impact on employees’ job satisfaction and we observed that there was a significant difference with payment and nature of the job. The overall result of reward systems shows financial rewards has a great impact on the job satisfaction of employees. Key words: Financial rewards, Non financial rewards, pay, benefit, recognition, promotion, nature of job, working condition and employees’ job satisfaction