Laboratory Experiments on Observation of Riverine Floating Litter Under Nighttime and Rainfall Conditions

Key Points

• This research aims to develop and validate methods for observing floating litter in rivers under nighttime and rainy conditions.
• Combined floodlights and near-infrared cameras for observation during simulated rainfall.
• Conducted daytime and nighttime experiments to compare visibility of floating litter.
• Evaluated results through visual assessment and object detection model performance.
• Nighttime observations yielded stable water surface reflections, but rain droplets on the camera lens hindered visibility.
• Object detection was significantly impaired during rainfall compared to clear conditions.
• Adjusting lighting to exclude the camera's field of view reduced reflections from raindrops, improving the accuracy of detection.