Geological Environmental Monitoring Of Shallow Geothermal Energy In Tianjin

The shallow layer geothermal energy is the geothermal energy which Resourced inthe rock and soil,Groundwater under the Surface some depth range(200m),it is renewableenvironmental protection energy.And has broad prospects.Tianjin’s Plain which is11250km2covered with Loose Sediment more than200m,and shallow layer geothermalenergy is huge,exploitation is Obvious advantage.The development situation is verygood with the support of related policies and Technology.According to statistics, up untilthe end of year2012,the using area of shallow layer geothermal energy of Tianjin is57300000m2,it gains good social and economic interests.The Exploitation of Dynamic Monitoring is the base which push the scientific andrational exploitation of the shallow layer geothermal energy.Because the shallow layergeothermal energy is below the surface200m, if we disregard the influence of mining togeologic environment,it will have serious result.The apply of ground source heat pumpchanges original characteristic of the geothermal field,hydrodynamic field,chemical fieldof the item on a certain extent. Although the exploitation of ground source heat pumpis trending to mature at present,the design effort of ground source heat pump is in theorystage. The build of these theory is based on heat conduction,ignoring the influence ofunderground thermal coupling and underground water flow,which makes the earlier stagehave some error.So it is necessary to research the heat transfer performance of soil heatexchanger and change of geothermal field.Because the most of the built developapplication items have not built monitoring point,so we cann’t understand the long-termchange of the whole temperature field of the area which imbedding soil heatexchanger,influence degree of the layer out the area,water level and water qualityunderground of this area,geothermal field of water source well around thelayer,engineering construction area ground elevation whether or not influenced by systemmoving,it is necessary to install and imbedding some essential measuring instruments.wemonitor,collect and gather dynamic data by kinds of effective means andmeasures,analyse and handle the information came form each monitoring point. Weresearch the change law of rock-soil inside temperature field which is influenced byimbedding pipe,underground water flow,rock-soil heat properties and other factors.We also forecast change tendency,amend some incorrect and unreasonable plans,providebase data for reasonable utilization of resource.