Environmental geology of the Longquanshan urban forest park, Chengdu, Sichuan

The present paper gives a detailed examination on the environmental geology of the Longquanshan urban forest park in Chengdu, Sichuan on the basis of the previous results and analytical data of the selected samples in this study. On the whole, the Longquanshan urban forest park has good geological conditions, and the overall planning schemes of the urban forest park are suitable for the geological conditions of the Longquanshan area. However, particular attention should be drawn to the geological hazards developed in local parts, gas accumulation in shallow underground spaces and local groundwater pollution. The geological hazards consist dominantly of small-scale landslides, collapses and unstable slopes developed in the coral part of the Longquanshan anticline and fault zone. The construction of tourist roads and recreational facilities should steer clear of the above-mentioned geological hazards. The advanced geological forecasting, monitoring of gas concentration and ventilation, and fire source control should be strengthened in the construction of underground engineering projects. The underground water types include the HCO₃-CaMg type and HCO₃-Ca types. Affected by the human pollution, the total hardness, ammonia nitrogen and chlorides in the shallow underground water in local parts are all out of standard. It is suggested that much attention should be given to the management and control of groundwater utilization and ecological environmental protection in the key areas of the Longquanshan urban forest park.