Monitoring streamflow and sediment transport rates in Ethiopia

Understanding Soil Erosion Processes for Effective Management in Data Limited Basins

Haftu Hadush recently completed a three-month field campaign in Ethiopia to monitor streamflow and sediment transport rates at the outlet of a sub-watershed in the Omo-Gibe basin. They measured stream velocities at 10 to 18 locations across the stream using a Pygmy current meter. These velocity measurements were converted into streamflow using the stream profile to develop a rating curve.

Besides, they collected three depth-integrated suspended sediment samples from different points in the river during the morning, evening, and after 14 rainfall events. The campaign also included bathymetric surveys and water quality assessments at the Gibe III dam reservoir inlet, providing valuable initial insights into sediment dynamics and lacustrine delta development. A thorough analysis of the collected data helps to formulate more nuanced findings and actionable recommendations for effective soil erosion management in the basin.

The primary objectives guiding this research are as follows:
Q1: How do morphological changes in catchments affect sediment transport within a gully system?
Q2: In what ways can the development of lacustrine deltas serve as an alternative approach for assessing long-term soil erosion within catchments?

Through this research, we hope to contribute to a deeper understanding of soil erosion processes and foster better strategies for managing soil and water resources in landscapes that grapple with data limitations.