李家峡水库区粉土质库岸运移模式研究

Study on The Migration Mode of Silty Soil Bank in Lijiaxia Reservoir Area

李家峡水电站已安全运行发电21a。通过对该水库塌岸全面调查,发现水库区部分粉土质库岸塌岸宽度难以用目前已有的塌岸理论解释。在现场详细观察的基础上,从颗粒在水中的启动流速、颗粒下沉速率、运移距离、泥沙的临界启动风速等方面进行分析论证,提出李家峡水库区部分粉土质库岸塌岸有异于常规水下自然休止角的塌岸模式,为类似水库塌岸预测及岸坡灾害治理提供依据。

Lijiaxia Hydropower Station has been operating safely for 21 years. Through a comprehensive investigation of the bank collapse in the reservoir area, it is found that the bank collapse width of some silt bank in the reservoir area is difficult to explain with the existing bank collapse theory. On the basis of detailed observation on the site, the paper analyzes and demonstrates the starting velocity of the particles in the water, the rate of particle sinking, the migration distance, and the critical starting wind speed of the sediment. It is suggested that some of the silt bank collapse in the Lijiaxia reservoir area is different from the bank collapse under the conventional underwater natural angle of repose. The paper provides a basis for collapse prediction and disaster management of similar reservoir bank.