Abstract：The Guangxi castal zone is located in the earthquake subsidence belt of southeastern China, in which the earthquake is rather active, and the tropical cyclone is rather frequent. The geo-environmental problem and geo-hazard risk have become more serious, but there are insufficient land-sea synchronously-observed methods and long-term monitoring data to prevent the burgeoning crisis. A set of integrated geophysical exploration, geological sampling, seawater sampling and ocean current survey are used to monitor the geo-environment along the Guangxi coastal zone of Beibu gulf during the last five years, and the auunal variation of shallow strata, bottom sediments, detrital minerals, heavy metals and seawater elements are analyzed and assessed for the first time. The results show that the spatial and temporal variations are significant, the balance point change of beach surface is distinct, and the scouring and silting change is great. The seawater pollutants are mainly composed of nutrition salt, oil and heavy metals, and the geo-environment of some segments of the Guangxi coastal zone is changed by human. The water quality is related with local environment improvement. The vulnerability and the risk of geo-harzard should be paid more attention and need further monitoring.
2016, Vol. 3 
