Geological Environment Problems of Urban Shallow Geothermal Energy Development
The ecological and geological environmental issues related to the development and utilization of shallow geothermal energy were thoroughly examined in this study,considering both objective factors and human factors.Through soil temperature testing and monitoring of cold and heat balance within formations,the analysis focused on problems arising from ground source heat pump operation,including thermal pollution,decline in groundwater levels,ground subsidence,and deterioration of groundwater quality.The research indicates that long-term use of ground source heat pump systems with unreasonable design or low groundwater recharge rates can disrupt the cold and heat balance within formations.In regions where heating periods exceed cooling periods,formation temperatures gradually decrease over time leading to concentrated release of N2O and CH4 gases which hinder biological growth.Difficulties in recharging groundwater during operation of groundwater source heat pumps result in ecological environmental issues,such as wastage of groundwater resources and water level depletion,additionally causing geological environmental problems like pavement collapse and ground settlement.Significant differences between heating period duration versus cooling period duration lead to changes in groundwater temperature directly impacting pollutant degradation within the water system while indirectly affecting its overall quality.Pumping out and recharging groundwater causes oxygen from air to dissolve into water thereby altering its quality.By analyzing prominent issues along with influencing factors associated with shallow geothermal energy development and utilization,this study provides a scientific basis as well as technical support for its rational implementation.
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