Characteristics of hydrologic and hydrochemical regime of the dripping water in the Xiaoyan cave, Guilin

In order to know the dynamic characteristics of cavern hydrochemistry in bare karst aeration zone, three drip water points in the Xiaoyan cave are selected as the research site, and the dripping rate, conductivity, pH, Ca2+, Mg2+, Sr2+ etc. are monitored. The results show that (1) ion concentration of the dripping water is of obvious relationship with temperature and precipitation, and high temperature and rainy weather will speed up karstification, make Ca2+, Mg2+ content increase, heavy rain will bring about a great fluctuation in the concentration; (2) chemical properties are affected by soil and rock roof thickness as well as drip water yield, the thicker the soil layer, the higher the calcium ions content in the water; (3) the dripping water yield of the “slow recharge” dripping point shows a positive correlation with the ions content, but the dripping water yield of the “rapid recharge” dripping point shows a negative correlation with the ions content, and when both “slow recharge” and “rapid recharge” dripping water exist at one point, the dripping water yield and ion content change violently, and the correlation is positive.