An Affordable Streamflow Measurement Technique Based on Delay and Sum Beamforming. - Giuseppe Passarella; Aimé Lay-Ekuakille; John Peter Djungha Okitadiowo; Rita Masciale; Silvia Brigida; Raffaella Matarrese; Ivan Portoghese; Tommaso Isernia; Luciano Blois (Sensors, 2022)