Lake Tana: Source of the Blue Nile

Vijverberg, J.; Sibbing, F.A.; Dejen, Eshete

doi:10.1007/978-1-4020-9726-3_9

Cited by 73 publications

(77 citation statements)

References 38 publications

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“…Geographically the lake lies between 278,946 meter E, 1,280,138 meter N and 349,403 meter E, 1,360,638 meter N. It is the largest fresh water resource in Ethiopia and contains half of the county's fresh water reserve [32] covering 20% of the drainage area of the 15,096 km 2 Lake Tana basin [33]. The rural populations as well as those from Bahir Dar town are highly dependent on revenues from the lake economy as it fulfills services such as transportation, hydropower, irrigation, fishery and ecotourism [34].…”

Section: Description Of Study Areamentioning

confidence: 99%

“…Usually shallow lakes are susceptible for water quality impairment [36] and carrying out this study in Lake Tana vital. The Lake has an average temperature northwest [32]. The Lake is fed by more than 40 small streams [37] [38] [39] and receives 93% of its volume from the major rivers of Gilgel Abay, Gumara, Ribb and Megech [37].…”

Section: Description Of Study Areamentioning

confidence: 99%

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Water Quality Assessment by Measuring and Using Landsat 7 ETM+ Images for the Current and Previous Trend Perspective: Lake Tana Ethiopia

Moges¹,

Schmitter²,

Tilahun³

et al. 2017

JWARP

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Recently there are signs of water quality impairment in Lake Tana, the largest fresh water in Ethiopia. The lake is the growth corridor of the government and supports millions of livelihood around. In order to sustain the benefit and maintain the ecosystem of the lake, the lake health has to be kept safe. Therefore monitoring and evaluation of the water quality of lake is very vital. This study focuses on current and previous trends water quality of the lake through measurements and Landsat Images near entry of Gumera River. Statistical analysis of the physical (Turbidity and STD and biological (Cha-a,) and chemical (DPC) water quality parameters were done. Linear and non-linear regression models between water quality parameter and reflectance of Landsat 7 ETM+ images were fitted based on band combinations. Pervious trend in turbidity was analyzed based on the regression models. The results showed that reflectance and turbidity satisfactorily result with an R 2 ranging from 0.61 -0.68. Form 1999-2014 the turbidity of the lake has indicated an increasing trend. Delta development near the entry of Gumera River has been enlarged by 48% because of an increase sediment inflow. The sign in the decreasing water quality of the lake was attributed to the non-point source sediment and nutrient inflow to the lake with high erosion rate from the watersheds. Measures to reduce the non-point source sediment and nutrient inflow by targeting the source areas (hot spots) in the agricultural watersheds need to be priority for stakeholders working on the soil and water conservation. Moreover, reducing the recession agriculture around the lake and wetland management could be crucial for improving lake water quality.

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Section: Description Of Study Areamentioning

confidence: 99%

Section: Description Of Study Areamentioning

confidence: 99%

Water Quality Assessment by Measuring and Using Landsat 7 ETM+ Images for the Current and Previous Trend Perspective: Lake Tana Ethiopia

Moges¹,

Schmitter²,

Tilahun³

et al. 2017

JWARP

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“…The Lake Tana and the adjacent wetlands provide directly and indirectly a livelihood for more than 500,000 people [14]. In Lake Tana fisheries, there are ten districts that have a potential for fishing and more than 5400 fishers have been engaged in fishing in a seasonal and full time basis at this time.…”

Section: Introductionmentioning

confidence: 99%

Current Trend of Water Hyacinth Expansion and Its Consequence on the Fisheries around North Eastern Part of Lake Tana, Ethiopia

Asmare¹

2017

J Biodivers Endanger Species

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The study was conducted from June, 2015 to October, 2016 to assess the effect of water hyacinth on fishing and fishers around the North-Eastern part of Lake Tana. The presence of water hyacinth in Lake Tana has been recognized in 2011. Starting from the last five years, especially after 2014, fishing in the study area becomes tiring due to the expansion of this invasive weed. Water hyacinth entangles the fishing nets and boats' propeller, making it difficult to fish and resulting in reduced fish catches. Hence, a reduced fish catch would have an adverse effect on the quality of life of the communities around the lake and consequently affect sustainable development in the region. Despite the fact that several efforts have been made by different parties, water hyacinth in Lake Tana continues to expand itself year after year. Therefore, o its expansion is not easy to manage and complete eradication is unimaginable. Therefore, if the expansion of water hyacinth continues in this trend, it can negatively affect the livelihood of fishers in both directions by increasing costs of fishing and reducing the amount of fish caught.

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“…It is the home to a unique fish population of which 20 fish species are endemic (Vijverberg et al, 2009). In the 1920s, the lake was described as beautiful, pristine with a sandy bottom near the inlets of the major rivers (Cheesman, 1936).…”

Section: Materials and Methods Study Area: The Lake Tana Basinmentioning

confidence: 99%

“…In addition, the increased sediment load is reducing the storage of the reservoirs faster. Moreover, increased turbidity due to sediment reduces light penetration and threatens the aquatic ecosystem; in the case of Lake Tana, the livelihood of over 500,000 people are directly or indirectly dependent on the lake and wetlands (Vijverberg et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Budgeting suspended sediment fluxes in tropical monsoonal watersheds with limited data: the Lake Tana basin

Zimale

Moges

Alemu

et al. 2017

Journal of Hydrology and Hydromechanics

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Soil erosion decreases soil fertility of the uplands and causes siltation of lakes and reservoirs; the lakes and reservoirs in tropical monsoonal African highlands are especially affected by sedimentation. Efforts in reducing loads by designing management practices are hampered by lack of quantitative data on the relationship of erosion in the watersheds and sediment accumulation on flood plains, lakes and reservoirs. The objective of this study is to develop a prototype quantitative method for estimating sediment budget for tropical monsoon lakes with limited observational data. Four watersheds in the Lake Tana basin were selected for this study. The Parameter Efficient Distributed (PED) model that has shown to perform well in the Ethiopian highlands is used to overcome the data limitations and recreate the missing sediment fluxes. PED model parameters are calibrated using daily discharge data and the occasionally collected sediment concentration when establishing the sediment rating curves for the major rivers. The calibrated model parameters are then used to predict the sediment budget for the 1994-2009 period. Sediment retained in the lake is determined from two bathymetric surveys taken 20 years apart whereas the sediment leaving the lake is calculated based on measured discharge and observed sediment concentrations. Results show that annually on average 34 t/ha/year of sediment is removed from the gauged part of the Lake Tana watersheds. Depending on the up-scaling method from the gauged to the ungauged part, 21 to 32 t/ha/year (equivalent to 24-38 Mt/year) is transported from the upland watersheds of which 46% to 65% is retained in the flood plains and 93% to 96% is trapped on the flood plains and in the lake. Thus, only 4-7% of all sediment produced in the watersheds leaves the Lake Tana Basin.

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Lake Tana: Source of the Blue Nile

Cited by 73 publications

References 38 publications

Water Quality Assessment by Measuring and Using Landsat 7 ETM+ Images for the Current and Previous Trend Perspective: Lake Tana Ethiopia

Water Quality Assessment by Measuring and Using Landsat 7 ETM+ Images for the Current and Previous Trend Perspective: Lake Tana Ethiopia

Current Trend of Water Hyacinth Expansion and Its Consequence on the Fisheries around North Eastern Part of Lake Tana, Ethiopia

Budgeting suspended sediment fluxes in tropical monsoonal watersheds with limited data: the Lake Tana basin

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