四川省是我国山洪灾害高发区，近年来山洪发生频繁，给当地带来巨大的灾害和损失。有效的山洪预警预报对防御山洪灾害具有重要作用。本课题以四川省暴雨作用下的山洪形成过程为对象，研究山洪成因及相应有效的山洪预警预报方法。本课题的主要研究内容包括：（1）在充分掌握四川省山洪资料的基础上，摸清四川省山洪的特征及时空分布规律；（2）从气象和下垫面着手，分析探索山洪的主要影响因子及临界条件，建立基于模式识别的山洪预警模型；（3）深入研究流域的产汇流规律，建立山洪水文水动力学预报模型；（4）对山洪形成与演化过程进行模拟预测，确定不同级别山洪的影响范围和规模。课题研究成果对防御四川省山洪灾害，保障四川省公共安全和经济社会发展具有重要作用。

Sichuan Province experienced a number of catastrophic flash floods in the past few years. Effective flash flood warning and forecasting can be important for disasters reduction. The main objective is to study the causation of flash flood and achieve technological lnnovation in flash flood warning and forecasting, including the following main contents: (1) The temporal and spatial characteristics of flash flood in Sichuan Province by examination of data concerning a number of flash flood; (2) Developing a flash flood warning model based on pattern reorganization, by considering a wide range of climatic and physiographic conditions; (3)Developing a hydrological and hydraulic model for flash flood forecast based on runoff yield and routing rules; (4) Examination of the influence of flash floods at various scales and under various scenarios. This study is important for the economy and society development of Sichuan Province.