Tea Time Talk: COSMOS, Scintillometer & Eddy Cov New Technologies to save Irrigation Water
Wednesday 23rd June 2021, 4pm to 5.30pm (BST) – Online Event
Speaker: Dr Ragab Ragab, President ICID
Members and non members of IWF are welcome to attend the meeting.
Free of charge. Please register here. Attendance is limited to 100.
Accurate estimation of irrigation water requirements could save water and minimize losses, allowing more land to be irrigated and subsequently more food to be produced. Irrigation practitioners have always faced the challenge of “when to irrigate and how much water to apply”. To answer those questions several methods have been developed, ranging from measurement based to empirical and energy balance equation based approaches. The accuracy of those methods and the scale they represent are of great importance.
Modern technologies to measure actual evapotranspiration and subsequently the crop water requirement, such as large-aperture Scintillometer and Eddy Covariance instruments were tested and compared with the most common method of the FAO modified Penman–Monteith equation. The results indicate that the actual crop water requirement based on modern technologies could save at least 50% of irrigation water. Another benefit is that these modern technologies do not need the crop coefficient Kc, which for many irrigation practitioners is difficult to obtain. In addition, the cosmic-ray soil moisture observing system (COSMOS) was tested for its suitability in estimating the soil moisture deficit (SMD) and subsequently, the crop water requirement. The results showed that the COSMOS measurements could be useful for monitoring the soil water status and SMD in the root zone in irrigated agriculture and could be made operational for irrigation managers to determine when and how much irrigation water to apply.
Please register here.
Mekong River Basin
November 2021, Institution of Civil Engineers, Westminster, London – and online
Originally planned as our November 2020 meeting, we have decided to postpone this meeting until 2021 to allow us to hold it as a physical meeting. More details to follow.