Fig. 4. Ultrasound imaging test system. (a) Indoor glass water tank; (b) Ultrasonic probe and model pollutants; (c) Portable ultrasound diagnostic instrument (PUDI) and computer. Fig. 5. The monitoring test of granular pollutants by using the PUDI which is composed of an improved Apogee 1100 digital color Doppler ultrasound diagnostic system. 54 such as the imaging bright bands of soft rock surface at the bottom, the shape and the movement of abnormal spots or stripes from the imaging granular pollutants, as shown in Fig. 6. By analyzing and monitoring the changes of these spots or bright bands, the visualization analysis and detection of groundwater pollutants can be realized, as well as the monitoring of the characteristics of the imaging structures and their changes of underwater granular pollutants. In the process of pollutant transport, particulate pollutants will settle through osmotic transport from top to bottom. The physical and chemical reactions and cross fusion are carried out with groundwater as the carrier. The continuous deposition occurs at the interface of water-soil-rock, and then a granular pollutant accumulation surface is formed. This accumulation surface will create a special granular pollutant storage area over time. This ultrasound imaging analysis allows the morphological characteristics of the particulate pollutants in the area to be obtained, along with the profile image characteristics of the regional organizational structures, which lays a foundation for the qualitative and quantitative analysis of pollutants. Therefore, the research and analysis of this experiment are mainly carried out in the following phases: the identification IEEE Instrumentation & Measurement Magazine February 2023