Research on Parameter Sensitivity Analysis of Distributed Hydrological Model in Karst Watershed

Irrational use of water resources in Karst regions, resulting in the fragile environment for further deterioration, native vegetation degradation, soil erosion, desertification intensified, frequent occurrence of floods, therefore, it is import to explore the methodologies to accurately simulate the water cycle process in Karst river basin. The paper applies local sensitivity analysis method and LH-OAT algorithm to distributed hydrological simulation of Karst river basin, finds out the most sensitive parameters, simulation results has improved significantly, the Nash efficient coefficient increases from 0.3 to 0.7, and the difference of annual runoff in each year is less than 15%, provides a good suggestion for the future construction and application of distributed hydrological model in typical Karst watershed, which has significant scientific meaning.