The ecosystems in coastal areas are sensitive to human activity and climate change.Real-time observations are essential to understand the effects of climate and human perturbation on the environment and ecosystem function.Based on high frequency acoustic tomography,this study presents a sound technique to monitor coastal surfaces.This technique could obtain information of flow,temperature and water level with high temporal resolution by calculating reciprocal sound transmission time.The preliminary experimental results show that this technique could effectively monitor hydrological parameters of coastal ecosystems under extreme weather conditions.This could contribute to a better understanding of hydrodynamic forces.