STUDY ON THE DYNAMIC CHANGES OF SPRING FLOW, CONDUCTIVITY AND pH VALUE

Karst water, referring to the groundwater that is hosted in karst pores, serves as the major water source for production and life in southern China. With the increasing social demand for water, the development and utilization of karst water resources is becoming more and more important. By regularly monitoring the spring flow, conductivity and pH value of Yuelu Mountain, combined with the rock-soil layer property of Yuelu Mountain and rainfall of Changsha City, the statistical analysis and Spearman rank correlation coefficient method are used to study the spring flow changes and qualitatively evaluate the water quality. The results show that rainfall replenishes karst water and increases spring flow. The spring flow is not only related to rainfall but also affected by soil infiltration rate and rainfall duration. The Spearman rank correlation coefficient method can be used to quantitatively calculate the correlation between conductivity and time, and indirectly judge the influence of surrounding environment on spring water quality, which is conducive to identify the representative location of conductivity, better monitor and evaluate karst water. The pH value of karst water tends to be acidic in areas with serious acid precipitation pollution of soil or frequent acid rain. The study of spring flow and water quality is beneficial to scientific development and utilization of karst water.