Assessment Of Causes And Impacts Of Flooding On Agricultural Production Of Plains Surrounding Lake Tana Ethiopia
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Assessment Of Causes And Impacts Of Flooding On Agricultural Production Of Plains Surrounding Lake Tana Ethiopia
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Author : Yirga Alemu Azene
language : en
Publisher: GRIN Verlag
Release Date : 2020-11-26
Assessment Of Causes And Impacts Of Flooding On Agricultural Production Of Plains Surrounding Lake Tana Ethiopia written by Yirga Alemu Azene and has been published by GRIN Verlag this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-11-26 with Technology & Engineering categories.
Master's Thesis from the year 2007 in the subject Agrarian Studies, grade: Very Good, , course: Irrigation Engineering, language: English, abstract: This study is an attempt to identify the main causes and effect of flooding on agricultural production and the peoples living in the Lake Tana surroundings. Although floods are relatively common during the June to September rainy season in Ethiopia, the magnitude of the current flooding in 2006 is unprecedented. In year 2006 the country has experienced some of the heaviest and most intense rains on record; resulting in flash floods and/or the overflow of rivers, lakes and dams, where local residents have been advised to leave. The impact of the disaster in terms of lives, infrastructure, livelihoods, and basic coping mechanisms has yet to be assessed The rainfall variability analysis of the Lake Tana (LT) basin in 2006 showed an on average 43% increase in wet season rainfall than the normal (mean). All rainfall gauging stations show an increase in rainfall in 2006. Similarly, the variability analysis of major rivers also showed that on average 35% increase in flood season streamflow of G/Abay, Gumara, Rib, Megech, and Koga. The trend of these rivers shows that maximum runoff for the year 2006 was higher than the mean of the long term maximum flood. Whereas Lake Tana maximum flood level of 2006 (1787.155masl) shows an increase of 16 cm only from the mean flood levels of previous records (1787 masl). The Pearson III method of the moment probability distribution is the best fit for Megech and Rib rivers. For Gumara river Pearson III probability weighted moment distribution better estimate flood quantiles with less standard error. It is also found that Gamma two probability weighted moment is the best fit for Lake Tana water surface level. In general, from rainfall and flood frequency analysis the 2006-year flooding may have a chance to occur once in six years in LTB. The 2006-year flood damage indicates that there is a high impact on agricultural production of Lake Tana surrounding plains. 107,647 peoples were actually affected by floods. At least 448, 910 quantal of food grain, 1230 domestic animals, 9634 chickens, and 1088 bee-hives were damaged by the 2006 flood. The impacts of flooding on socio-economic and environmental resource indicators were qualitatively assessed. Totally twenty-seven indicators were assessed.
Downstream Consequences Of Ribb River Damming Lake Tana Basin Ethiopia
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Author : Chalachew Abebe Mulatu
language : en
Publisher: CRC Press
Release Date : 2022-02-09
Downstream Consequences Of Ribb River Damming Lake Tana Basin Ethiopia written by Chalachew Abebe Mulatu and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-02-09 with Science categories.
This study assessed the downstream river system adaptation in response to upstream damming on the Ribb River, Ethiopia, to irrigate 15,000 ha. It combined primary and secondary data, and the application of remote sensing and mathematical modeling. The pre-dam morphodynamic trends of the Ribb River were analyzed for 59 years based on aerial photographs, satellite images, and newly collected field data. Three dam operation scenarios were developed to analyze the long-term hydro-morphological effects of the dam on the downstream river reaches. It also assessed the applicability of physics-based analytical equations (Equilibrium Theory) compared to a 1D numerical model (SOBEK-RE) to determine the least-morphologically impactful dam operation scenario on the river reaches downstream of the dam. Moreover, a HEC-RAS 2D hydrodynamic model was developed to assess the effect of the dam on the flooding extent of the Fogera Plain. This was used to study the potential implications of hydrological alteration on the ecology of the floodplain wetlands, as they are the habitats of important fish and bird species. The results contribute to knowledge on the hydro-morphological and environmental impacts of dams on downstream river systems. The developed methodologies and findings may be used to study future hydro-morphological and ecological changes that may arise due to other dam operations or climate change.
Extreme Hydrology And Climate Variability
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Author : Assefa M. Melesse
language : en
Publisher: Elsevier
Release Date : 2019-07-03
Extreme Hydrology And Climate Variability written by Assefa M. Melesse and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-07-03 with Science categories.
Extreme Hydrology and Climate Variability: Monitoring, Modelling, Adaptation and Mitigation is a compilation of contributions by experts from around the world who discuss extreme hydrology topics, from monitoring, to modeling and management. With extreme climatic and hydrologic events becoming so frequent, this book is a critical source, adding knowledge to the science of extreme hydrology. Topics covered include hydrometeorology monitoring, climate variability and trends, hydrological variability and trends, landscape dynamics, droughts, flood processes, and extreme events management, adaptation and mitigation. Each of the book's chapters provide background and theoretical foundations followed by approaches used and results of the applied studies. This book will be highly used by water resource managers and extreme event researchers who are interested in understanding the processes and teleconnectivity of large-scale climate dynamics and extreme events, predictability, simulation and intervention measures. Presents datasets used and methods followed to support the findings included, allowing readers to follow these steps in their own research Provides variable methodological approaches, thus giving the reader multiple hydrological modeling information to use in their work Includes a variety of case studies, thus making the context of the book relatable to everyday working situations for those studying extreme hydrology Discusses extreme event management, including adaption and mitigation
Seasonal Flooding Vulnerability Cause Impact And Coping Strategies In Southern Ethiopia Urban Areas The Case Of Sawla Town
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Author : Aman Asefa Senbeto
language : en
Publisher: GRIN Verlag
Release Date : 2018-11-27
Seasonal Flooding Vulnerability Cause Impact And Coping Strategies In Southern Ethiopia Urban Areas The Case Of Sawla Town written by Aman Asefa Senbeto and has been published by GRIN Verlag this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-11-27 with Science categories.
Academic Paper from the year 2012 in the subject Geography / Earth Science - Miscellaneous, grade: 4/4, Ethiopian Civil Service University, language: English, abstract: Sawla town is geographically inscribed by the chains of mountain range from south to west, and from west to north. And the main town is dissected by two crossing rivers namely, ‘Womba and Cholea’. Due to increasing demographic dynamics of the town accompanied by rapid urbanization, demand of land for housing is higher than that of the available recognized land under the municipal authority; hence informal settlement patterns are becoming the usual trend especially towards ecologically sensitive boundaries of the town which is characterized by mountain hill sides, sloppy forest land and gully structures and the two river plains. As a result of deforestation and impermeable coverings by construction, the capacity of the natural land feature to infiltrate and percolate rain precipitation is decreasing from time to time with the subsequent increase in surface runoff conveyed to water bodies across drainages and urban storm ways. This trend of increase in surface runoff is featuring Sawla town by seasonal flooding calamity with a serious social, economic and environmental impact especially encountered by poor vulnerable communities. Therefore the purpose of this study is to assess seasonal flooding vulnerability, cause and impact in Sawla town by then suggesting feasible recommendation to mitigate the impact of seasonal flooding on the social, economic and environmental wellbeing of the town. A descriptive research type was employed to describe the cause and impacts of seasonal flooding on vulnerable communities of the town. Reliable data have been gathered from 163 (93% response rate) randomly selected respondents founded from four kebeles (Zirko, Botre, Kera and Kusti) of the town through questionnaire, interview and observation. Based on the data obtained from the field and secondary data sets, urbanization and informal settlement, deforestation, rainfall variability as climatic change and inadequacy of infrastructure are identified causes of seasonal flooding in the town. This seasonal flooding trend produced serious social, economic and environmental damages in Sawla town.
Spatial Modeling In Gis And R For Earth And Environmental Sciences
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Author : Hamid Reza Pourghasemi
language : en
Publisher: Elsevier
Release Date : 2019-01-18
Spatial Modeling In Gis And R For Earth And Environmental Sciences written by Hamid Reza Pourghasemi and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-01-18 with Mathematics categories.
Spatial Modeling in GIS and R for Earth and Environmental Sciences offers an integrated approach to spatial modelling using both GIS and R. Given the importance of Geographical Information Systems and geostatistics across a variety of applications in Earth and Environmental Science, a clear link between GIS and open source software is essential for the study of spatial objects or phenomena that occur in the real world and facilitate problem-solving. Organized into clear sections on applications and using case studies, the book helps researchers to more quickly understand GIS data and formulate more complex conclusions. The book is the first reference to provide methods and applications for combining the use of R and GIS in modeling spatial processes. It is an essential tool for students and researchers in earth and environmental science, especially those looking to better utilize GIS and spatial modeling. Offers a clear, interdisciplinary guide to serve researchers in a variety of fields, including hazards, land surveying, remote sensing, cartography, geophysics, geology, natural resources, environment and geography Provides an overview, methods and case studies for each application Expresses concepts and methods at an appropriate level for both students and new users to learn by example
Analysis Of Alternative Procedures For The Evaluation Of Agricultural Flood Control Benefits
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Author : United States. Department of Agriculture. Economic Research Service
language : en
Publisher:
Release Date : 1971
Analysis Of Alternative Procedures For The Evaluation Of Agricultural Flood Control Benefits written by United States. Department of Agriculture. Economic Research Service and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1971 with Agriculture categories.
Social And Ecological System Dynamics
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Author : Krystyna Stave
language : en
Publisher: Springer
Release Date : 2017-04-06
Social And Ecological System Dynamics written by Krystyna Stave and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-04-06 with Technology & Engineering categories.
This book is a social—ecological system description and feedback analysis of the Lake Tana Basin, the headwater catchment of the Upper Blue Nile River. This basin is an important local, national, and international resource, and concern about its sustainable development is growing at many levels. Lake Tana Basin outflows of water, sediments, nutrients, and contaminants affect water that flows downstream in the Blue Nile across international boundaries into the Nile River; the lake and surrounding land have recently been proposed as a UNESCO Biosphere Reserve; the basin has been designated as a key national economic growth corridor in the Ethiopian Growth and Transformation Plan. In spite of the Lake Tana Basin’s importance, there is no comprehensive, integrated, system-wide description of its characteristics and dynamics that can serve as a basis for its sustainable development. This book presents both the social and ecological characteristics of the region and an integrated, system-wide perspective of the feedback links that shape social and ecological change in the basin. Finally, it summarizes key research needs for sustainable development.
Evaluation Of Current And Future Water Resources Development In The Lake Tana Basin Ethiopia
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Author : McCartney M. , Alemayehu T. , Shiferaw A. , Awulachew S.
language : en
Publisher: IWMI
Release Date : 2010
Evaluation Of Current And Future Water Resources Development In The Lake Tana Basin Ethiopia written by McCartney M. , Alemayehu T. , Shiferaw A. , Awulachew S. and has been published by IWMI this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with Tana, Lake (Ethiopia) categories.
Lake Tana, located in the headwaters of the Blue Nile, is valuable for many people including the communities who live around the lakeshore and those who live immediately downstream. The area has been identified as a region for hydropower and irrigation development, vital for economic growth in Ethiopia. A multidisciplinary study was conducted to assess the possible impacts of this development. This study found that current development has benefited some local people but adversely affected others. Future development will exacerbate pressure on the lake. Hard choices must be made about how the water is best utilized. It is important that all stakeholders, including local people, are involved in the decision-making process.
Wetlands Of Ethiopia
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Author : Kim Geheb
language : en
Publisher: IUCN
Release Date : 2003
Wetlands Of Ethiopia written by Kim Geheb and has been published by IUCN this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Nature categories.
Economic Impact Of Flooding On Agricultural Production In Northeast Central North Dakota
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Author : Jay Andrew Leitch
language : en
Publisher:
Release Date : 1977
Economic Impact Of Flooding On Agricultural Production In Northeast Central North Dakota written by Jay Andrew Leitch and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1977 with Agriculture categories.