Research on the Flood Classification for the Lower Reaches of Jinshajiang River

The characteristics of floods in a river and their classification are of great significance for the flood control, risk reduction and water resources utilization as well. This paper investigates the classification of floods in the lower basin of the Jinsha River based on flood area composition analysis and Fuzzy C-means Clustering Algorithm. The results show that the floods in the lower basin of the Jinsha River are divided into upstream type, interval type and tributary type according to their regional compositions; the three types of floods are divided into two categories according to their intensity and morphological indicators using fuzzy C-means. The flood classification of the lower reaches of Jinshajiang River in this study laid a foundation for the formulation of the joint operation rules of the cascade reservoirs in the lower reaches of Jinshajiang River, and the flood control standard of Yibin City could be raised to prevent 100-year flood approximate through the joint operation of the cascade reservoirs, additionally, it is of great importance to recognize the flood inflow as well as their control for the Three Gorges Reservoir.