New method accurately tracks water levels in remote rivers from space.
Researchers reconstructed water level and storage changes in the Yarlung Zangbo River from 2000 to 2020 using satellite data. They filled in missing river level records using area data and created virtual water level stations. The reconstructed water levels matched well with actual data, showing seasonal fluctuations and declining amplitudes downstream. The change in river water storage only accounted for a small portion of the basin's total water storage change. This method can help monitor long-term water changes in poorly gauged areas using satellite imaging and altimetry data.