Abstract
The newly-developed cosmic-ray method for measuring area-average soil moisture at the hectometer horizontal scale is being implemented in the COsmic-ray Soil Moisture Observing System (or the COSMOS). The stationary cosmic-ray soil moisture probe measures the neutrons that are generated by cosmic rays (or Cosmic-Ray Neutron Sensing-CRNS) within air and soil and other materials, moderated by mainly hydrogen atoms located primarily in soil water, and emitted to the atmosphere where they mix instantaneously at a scale of hundreds of meters and whose density is inversely correlated with soil moisture. The CRNS technique has been known for more than 10 years and validated by many scientific publications in the world. In Vietnam, a country greatly affected by global climate change, this is the first time this technique has been implemented and applied. Together with other traditional methods for soil moisture determination such as point measurement and remote sensing, CRNS technique will effectively contribute to the real-time monitoring of drought, prediction of flash floods and landslides, or planning irrigation in smart agriculture. This paper is written to introduce the results of the COSMOS-VINATOM project of the Ministry of Science and Technology. We describe the cosmic-ray soil moisture measurement method and the design of a specific COSMOS using advanced technologies in neutron and muon detector, signal processing and data transmission.This system has also been tested in the field in Xuan Canh commune, Dong Anh district, Hanoi, Vietnam with initial positive results.
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