Water Quality Assessment by Measuring and Using Landsat 7 ETM+ Images for the Current and Previous Trend Perspective: Lake Tana Ethiopia
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...
| Autores principales: | , , , , , , |
|---|---|
| Formato: | Journal Article |
| Lenguaje: | Inglés |
| Publicado: |
Scientific Research Publishing, Inc.
2017
|
| Materias: | |
| Acceso en línea: | https://hdl.handle.net/10568/98443 |
| _version_ | 1855536414813323264 |
|---|---|
| author | Moges, M.A. Schmitter, Petra S. Tilahun, Seifu A. Ayana, Essayas K. Ketema, A.A. Nigussie, T.E. Steenhuis, Tammo S. |
| author_browse | Ayana, Essayas K. Ketema, A.A. Moges, M.A. Nigussie, T.E. Schmitter, Petra S. Steenhuis, Tammo S. Tilahun, Seifu A. |
| author_facet | Moges, M.A. Schmitter, Petra S. Tilahun, Seifu A. Ayana, Essayas K. Ketema, A.A. Nigussie, T.E. Steenhuis, Tammo S. |
| author_sort | Moges, M.A. |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | 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 R2 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. |
| format | Journal Article |
| id | CGSpace98443 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 2017 |
| publishDateRange | 2017 |
| publishDateSort | 2017 |
| publisher | Scientific Research Publishing, Inc. |
| publisherStr | Scientific Research Publishing, Inc. |
| record_format | dspace |
| spelling | CGSpace984432025-10-14T15:09:09Z Water Quality Assessment by Measuring and Using Landsat 7 ETM+ Images for the Current and Previous Trend Perspective: Lake Tana Ethiopia Moges, M.A. Schmitter, Petra S. Tilahun, Seifu A. Ayana, Essayas K. Ketema, A.A. Nigussie, T.E. Steenhuis, Tammo S. water quality assessment landsat deltas lakes sediment nutrients watersheds water conservation soil conservation river basins phosphorus remote sensing 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 R2 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. 2017 2018-12-05T04:12:42Z 2018-12-05T04:12:42Z Journal Article https://hdl.handle.net/10568/98443 en Open Access Scientific Research Publishing, Inc. Moges, M. A.; Schmitter, Petra; Tilahun, S. A.; Ayana, E. K.; Ketema, A. A.; Nigussie, T. E.; Steenhuis, T. S. 2017. Water Quality Assessment by Measuring and Using Landsat 7 ETM+ Images for the Current and Previous Trend Perspective: Lake Tana Ethiopia. Water Research, 9:1564-1585. doi: 10.4236/jwarp.2017.912099 |
| spellingShingle | water quality assessment landsat deltas lakes sediment nutrients watersheds water conservation soil conservation river basins phosphorus remote sensing Moges, M.A. Schmitter, Petra S. Tilahun, Seifu A. Ayana, Essayas K. Ketema, A.A. Nigussie, T.E. Steenhuis, Tammo S. Water Quality Assessment by Measuring and Using Landsat 7 ETM+ Images for the Current and Previous Trend Perspective: Lake Tana Ethiopia |
| title | Water Quality Assessment by Measuring and Using Landsat 7 ETM+ Images for the Current and Previous Trend Perspective: Lake Tana Ethiopia |
| title_full | Water Quality Assessment by Measuring and Using Landsat 7 ETM+ Images for the Current and Previous Trend Perspective: Lake Tana Ethiopia |
| title_fullStr | Water Quality Assessment by Measuring and Using Landsat 7 ETM+ Images for the Current and Previous Trend Perspective: Lake Tana Ethiopia |
| title_full_unstemmed | Water Quality Assessment by Measuring and Using Landsat 7 ETM+ Images for the Current and Previous Trend Perspective: Lake Tana Ethiopia |
| title_short | Water Quality Assessment by Measuring and Using Landsat 7 ETM+ Images for the Current and Previous Trend Perspective: Lake Tana Ethiopia |
| title_sort | water quality assessment by measuring and using landsat 7 etm images for the current and previous trend perspective lake tana ethiopia |
| topic | water quality assessment landsat deltas lakes sediment nutrients watersheds water conservation soil conservation river basins phosphorus remote sensing |
| url | https://hdl.handle.net/10568/98443 |
| work_keys_str_mv | AT mogesma waterqualityassessmentbymeasuringandusinglandsat7etmimagesforthecurrentandprevioustrendperspectivelaketanaethiopia AT schmitterpetras waterqualityassessmentbymeasuringandusinglandsat7etmimagesforthecurrentandprevioustrendperspectivelaketanaethiopia AT tilahunseifua waterqualityassessmentbymeasuringandusinglandsat7etmimagesforthecurrentandprevioustrendperspectivelaketanaethiopia AT ayanaessayask waterqualityassessmentbymeasuringandusinglandsat7etmimagesforthecurrentandprevioustrendperspectivelaketanaethiopia AT ketemaaa waterqualityassessmentbymeasuringandusinglandsat7etmimagesforthecurrentandprevioustrendperspectivelaketanaethiopia AT nigussiete waterqualityassessmentbymeasuringandusinglandsat7etmimagesforthecurrentandprevioustrendperspectivelaketanaethiopia AT steenhuistammos waterqualityassessmentbymeasuringandusinglandsat7etmimagesforthecurrentandprevioustrendperspectivelaketanaethiopia |