Regarding concentrated leakage passage in dam basement as a continuous line-heat source,a heat conduction model was proposed by using line-heat source function.Moreover,to overcome the limitations of previous research, the length of the line-heat source was considered as limited,and the heat release rate of line source as changing along the leakage path.Then based on dummy heat source method and superposition method,a heat conduction model of double concentrated leakage passage with limited length was proposed and its analytical solution was derived.Eventually,an inverse calculation method was set up to obtain leakage velocity.Mean while,a laboratory experiment under different operating conditions was designed to model temperature field.The result of comparison of theoretical and measurement values showed that the heat conduction model proposed in this paper and its velocity inversion are precise and feasible.
