Abstract:

Droughts and floods are the main threats to the agricultural production, uneven distribution of precipitation is the important reason. Based on the precipitation records observed from the meteorological stations in Huachuan from 1967 to 2008, the characteristics of precipitation variation and regularity of drought and flood were analyzed with linear trend estimation method, mutation check, wavelet analysis and standard precipitation index (SPI). The results indicated that the precipitation over the same period with the growing season, and the distribution of monthly precipitation was not even. The difference of yearly showed a great degree, showed significant decreasing trends. Spring drought, summer and autumn floods were more serious, obvious features of the performance of droughts and floods in universality, seasonal, continuity and stage etc. On this basis, recommendations for the prevention of droughts and floods were advised, in order to guide the local agricultural production.