Application of plane heat source method in leakage analysis for Shijiao reach of Beijiang dike

The temperature field of groundwater during raising and falling periods of water level in the dike of Shijiao reach of Beijiang River were analyzed by using a plane heat source method. The location, state and permeability of a fault in the base rock can be judged from the analyses, and it can be seen that the fault is a strong permeable access that causes leakage in the dike base in flood periods .