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Role of Land–Water Classification and Manning's Roughness Parameter in Space-Borne Estimation of Discharge for Braided Rivers: A Case Study of the Brahmaputra River in Bangladesh

Abel Tadesse Woldemichael, Ahmed Mohammed Degu, A. H. M. Siddique-E-Akbor, Faisal Hossain
2010 IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing  
The proposed Surface Water and Ocean Topography (SWOT) mission will provide global, space-based estimates of water elevation, its temporal change, and its spatial slope for terrestrial water bodies. Using derivations of water slope from the Shuttle Radar Topography Mission (SRTM) elevation data, river bathymetry and Manning's equation, the potential of SWOT for discharge estimation of large braided rivers in humid climates, such as the Brahmaputra river, was found to be promising (Jung et al.,
more » ... n Earth Surface Processes and Landforms, 2009). In this study we extend the work on assessing SWOT for braided rivers to understand the sensitivity of two river hydraulic parameters to discharge estimation: 1) section factor (AR 2 3 ) derived from land-water classification and in-situ river bathymetry and 2) Manning's roughness coefficient. For braided rivers, the first parameter, is intimately dependent on how braided rivers are classified of the multiple channels (water) and in-stream braided bars (land) that consequently dictates the accuracy of wetted perimeter and area of flow estimation from water elevation data. We show that the use of the minimum water elevation data at a river cross section minimizes estimation of section factor which consequently minimizes outlier discharge estimation reported in the Jung et al. [12] study. We also show that by treating roughness coefficient "flexible" as a calibration parameter, discharge estimation from SRTM elevation data can be further improved through trial and error manual optimization. Our sensitivity study illustrates the value of treating section factor and roughness coefficient as calibration parameters for data assimilation systems that use SWOT observables to estimate river discharge in braided rivers.
doi:10.1109/jstars.2010.2050579 fatcat:qeuigq5gvfal7nec4epndaug7a

Intestinal Helminthes Infections and Re-Infections with Special Emphasis on Schistosomiasis Mansoni in Waja, North Ethiopia

T Dejenie, T Asmelash, M Teferi
2009 Momona Ethiopian Journal of Science  
., 1998; Birrie, 1994; Woldemichael and Kebede, 1996) , but none of them studied re-infection of S. mansoni infections.  ...  Similar findings were reported by different investigators (Birrie et al., 1994; Woldemichael and Kebede, 1996; Lemma, 1969) .  ... 
doi:10.4314/mejs.v1i2.46045 fatcat:y7w4ojhtyrh7hj7nc6rgive3lm

The recovery rate from severe acute malnutrition among under-five years of children remains low in sub-Saharan Africa. A systematic review and meta-analysis of observational studies

Hanna Demelash Desyibelew, Mulat Tirfie Bayih, Adhanom Gebreegziabher Baraki, Abel Fekadu Dadi, Mauro Lombardo
2020 PLoS ONE  
Formal analysis: Hanna Demelash Desyibelew, Adhanom Gebreegziabher Baraki, Abel Fekadu Dadi. Methodology: Hanna Demelash Desyibelew, Adhanom Gebreegziabher Baraki, Abel Fekadu Dadi.  ...  Software: Hanna Demelash Desyibelew, Adhanom Gebreegziabher Baraki, Abel Fekadu Dadi. Writing -original draft: Hanna Demelash Desyibelew, Adhanom Gebreegziabher Baraki, Abel Fekadu Dadi.  ... 
doi:10.1371/journal.pone.0229698 pmid:32187182 fatcat:r6ux5p5zevhorjqdbv73ky45aa