Numerical simulation study of shallow strata temperatures under the influence of karst conduit structures
When a water-bearing karst structure exists,the temperature field of shallow strata will change.The shallow temperature measurement method can quickly and easily obtain shallow geothermal data,and the distri-bution of karst structures can be inferred through temperature differences.To study the feasibility of detecting karst conduit structures using shallow temperature measurement technology in a site in Panzhou City,Guizhou Province,and its surrounding areas,the numerical simulation methods were used.The results show that different burial depths of the structure significantly change the temperatures of shallow strata.For a single karst conduit structure(with an equivalent diameter of 0.5 m and water temperature of 12 ℃),the maximum detectable depth is approxi-mately 66 m.When the fluid temperature inside the conduit is 12 ℃,an increase in the effective flow cross-sec-tional area of the karst conduit structure will lower the temperature of the shallow strata.When the equivalent diam-eter changes within the range of 0.1 to 1.0 m,the change in the temperature of the strata at 2.0 m is within 0.02 ℃,making it difficult to identify changes in the effective flow cross-sectional area of karst structures using shallow temperature measurement.The change in fluid temperatures within a certain range(12 to 18 ℃)will alter the temperatures of the shallow strata,especially the impact of low-temperature fluids.
shallow temperature measurement methodkarst conduit structurenumerical simulationstrata temperature field change
万方数据
维普
