Method for calculating karst underground river basin surface karst water reserves

The invention discloses a method for calculating karst underground river basin surface karst water reserves. The method comprises the following steps: S1, collecting samples of surface karst water EW, saturated zone fissure water FW and surface water PW, analyzing and determining representative components of the samples, and establishing a representative component relationship of the three samples; s2, selecting a rainstorm period, and continuously monitoring indexes of an underground river exit; s3, determining a mixing ratio and calculating a final component; s4, using MIX iteration to recalculate the component value of the final component; s5, calculating the mixing ratio of three end members in each sample at the outlet of the underground river; s6, obtaining a flow process curve of each end member; and S7, the surface karst water reserves are obtained by integrating the EW flow process curve. According to the method, the karst water system theory is used as guidance, the surface karst water flow process