Historical Causes and Future Projections of Hydrological Drought Change over a Semi-arid Watershed in the Yellow River Basin

Yang Jiao, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China, Xing Yuan, Institute of Atmospheric Physics, Chinese Academy of Sciences, State Key Laboratory of Earth System Numerical Modeling and Application, Beijing, China and Dawen Yang, Tsinghua University, State Key Laboratory of Hydroscience and Engineering, Department of Hydraulic Engineering, Beijing, China