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How drones are used to model river flows on a regional scale
Thursday, 2024/08/29 | 08:04:43

CGIAR August 26 2024

 

The Limpopo River Basin supports life across four countries in southern Africa: Botswana, Mozambique, South Africa and Zimbabwe. This precious resource must be sustainably and fairly managed, but the scale of monitoring conditions across the full extension of 1750 kilometers is daunting.

 

Under the CGIAR Initiative on Digital Innovation, the International Water Management Institute (IWMI) has partnered with GroundTruth to investigate the potential for unmanned aerial vehicles (UAVs) to survey and model the flow of water across the whole basin.

 

Bathymetric studies involve mapping the depth and features of waterbodies such as rivers, dams or lakes. They are used to detect hazards such as floods or water scarcity, track erosion and study ecosystems. The traditional method of manually mapping cross sections of a river is expensive, time-consuming and not practical to help water management bodies such as the Limpopo Watercourse Commission (LIMCOM) to make timely decisions.

 

UAVs, or drones, can be fitted with light-emitting radar (LiDAR) systems that use red light to map the surface of water bodies, and green light that penetrates to map the river or lake bed. GroundTruth has been contracted to investigate whether it is practical to use these UAV scans in combination with modelling software to accurately measure the flow of water and development of the Limpopo Basin system at scale. The project will result in a comparison of available approaches and a recommendation for what could be developed in the Limpopo context.

 

One outcome has been a drone-tethered boat packed with a suite of water sensors. “We are doing this to capture data on a whole stretch of river and to understand river dynamics in far more detail than was ever traditionally possible,” said hydrologist Keanu Singh of GroundTruth.

 

UAV-based bathymetry is just one of a suite of measurement and modelling systems being connected together by Digital Innovation to create a deep virtual representation of the Limpopo Basin, otherwise known as a digital twin. A prototype of the system, which allows 3D visualization of several data and modelling layers to aid natural resource managers to take better decisions, was showcased at the 10th World Water Forum in Bali.

 

“This data will be invaluable for the digital twin, enhancing environmental flow calculations and decision-making,” said Mariangel Garcia, research group leader at IWMI. “By visualizing discharge values, stakeholders can see how they affect habitats in real-time. Integrated with the digital twin, the system can dynamically generate scenarios that compare ideal versus current conditions, translating data into actionable insights. This allows for proactive management with visual alerts that show the ecosystem’s health and guide timely interventions.”

 

See https://www.cgiar.org/news-events/news/how-drones-are-used-to-model-river-flows-on-a-regional-scale/

 

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