Advanced search

Sediment budget of Lake Tana basin for optimisation of land management

Author
Organization
Abstract
The sediment budget of Lake Tana (Northern Ethiopia) will take into account the temporal and spatial variations of sediment production, transfer and deposition processes in the physiographic stretch of the basin. Suspended sediment measurement stations are established, including also discharge measurement instrumentation. The quantity of soil loss from headwater response units is estimated. The sediment transfer of the fluvial system is inferred through the sediment sinks in the river network. The probable sediment yield of ungaged sub-basins is estimated by the use of easured sediment load at adjoining monitoring stations. An attempt is also made to quantitatively estimate the suspended sediment yield of ungaged rivers using sediment plumes visible on satellite imagery. Existing plot, micro-basin and sub-catchment level data will be used to calibrate and validate the selected erosion model (SWAT). Measured data and SWAT model output will provide an assessment of the intensity of erosion processes at basin scale. In a further step, mean annual sediment deposition in Lake Tana will be estimated employing remote sensing and existing bathymetric surveys. The temporal analysis of successive satellite imagery will depict lake shrinkage. This will result in an estimation of sedimentation rate, eventually jeopardizing lake existence. From all this scrutiny (measurements, modelling, chronological observations) a sediment budget of Lake Tana basin will be constructed and the existing sedimentation problem will be quantified. Hence, insights will be gained in the extent to which upland erosion (decreased by sediment deposition in the floodplains) contributes to lake capacity losses as well, as well as into the transport processes and patterns. Lastly, the outcomes of the study will assist to formulate recommendations, that will be developed as a decision support system for optimising land management aimed at sedimentation control strategies. The preliminary results of this research will be the subject of a poster at the Water2011 conference.

Citation

Please use this url to cite or link to this publication:

Chicago
Negatu, Teshager Admasu, Jan Nyssen, Enyew Adgo, Jozef Deckers, Mekete Dessie Wosenie, Valentijn Pauwels, Niko Verhoest, and Jean Poesen. 2011. “Sediment Budget of Lake Tana Basin for Optimisation of Land Management.” In Water 2011, Abstracts, 114–114. Mekelle, Ethiopia: VLIR UOS - Mekelle University IUC programme.
APA
Negatu, T. A., Nyssen, J., Adgo, E., Deckers, J., Wosenie, M. D., Pauwels, V., Verhoest, N., et al. (2011). Sediment budget of Lake Tana basin for optimisation of land management. Water 2011, Abstracts (pp. 114–114). Presented at the International congress Water 2011 : Integrated water resources management in tropical and subtropical drylands, Mekelle, Ethiopia: VLIR UOS - Mekelle University IUC programme.
Vancouver
1.
Negatu TA, Nyssen J, Adgo E, Deckers J, Wosenie MD, Pauwels V, et al. Sediment budget of Lake Tana basin for optimisation of land management. Water 2011, Abstracts. Mekelle, Ethiopia: VLIR UOS - Mekelle University IUC programme; 2011. p. 114–114.
MLA
Negatu, Teshager Admasu, Jan Nyssen, Enyew Adgo, et al. “Sediment Budget of Lake Tana Basin for Optimisation of Land Management.” Water 2011, Abstracts. Mekelle, Ethiopia: VLIR UOS - Mekelle University IUC programme, 2011. 114–114. Print.
@inproceedings{1969142,
  abstract     = {The sediment budget of Lake Tana (Northern Ethiopia) will take into account the temporal and spatial variations of sediment production, transfer and deposition processes in the physiographic stretch of the basin. Suspended sediment measurement stations are established, including also discharge measurement instrumentation. The quantity of soil loss from headwater response units is estimated. The sediment transfer of the fluvial system is inferred through the sediment sinks in the river network. The probable sediment yield of ungaged sub-basins is estimated by the use of easured sediment load at adjoining monitoring stations. An attempt is also made to quantitatively estimate the suspended sediment yield of ungaged rivers using sediment plumes visible on satellite imagery. Existing plot, micro-basin and sub-catchment level data will be used to calibrate and validate the selected erosion model (SWAT). Measured data and SWAT model output will provide an assessment of the intensity of erosion processes at basin scale. In a further step, mean annual sediment deposition in Lake Tana will be estimated employing remote sensing and existing bathymetric surveys. The temporal analysis of successive satellite imagery will depict lake shrinkage. This will result in an estimation of sedimentation rate, eventually jeopardizing lake existence. From all this scrutiny (measurements, modelling, chronological observations) a sediment budget of Lake Tana basin will be constructed and the existing sedimentation problem will be quantified. Hence, insights will be gained in the extent to which upland erosion (decreased by sediment deposition in the floodplains) contributes to lake capacity losses as well, as well as into the transport processes and patterns. Lastly, the outcomes of the study will assist to formulate recommendations, that will be developed as a decision support system for optimising land management aimed at sedimentation control strategies. The preliminary results of this research will be the subject of a poster at the Water2011 conference.},
  author       = {Negatu, Teshager Admasu and Nyssen, Jan and Adgo, Enyew and Deckers, Jozef and Wosenie, Mekete Dessie and Pauwels, Valentijn and Verhoest, Niko and Poesen, Jean},
  booktitle    = {Water 2011, Abstracts},
  language     = {eng},
  location     = {Mekelle, Ethiopia},
  pages        = {114--114},
  publisher    = {VLIR UOS - Mekelle University IUC programme},
  title        = {Sediment budget of Lake Tana basin for optimisation of land management},
  year         = {2011},
}