石门水库排沙减淤技术研究

石门水库地处陕西省汉中地区,是一座重要的大(二)型水利枢纽,运行30多年,水库泥沙淤积问题非常严重,2002年实测淤积达到3800×104m3,呈三角洲和带状的混合淤积型态,并逐渐向锥体淤积形态发展。本文分析了水库的淤积发展、泥沙来源及综合控制措施,分析研究了汛期利用异重流排沙减缓淤积和定期泄空冲刷恢复库容的可行性,泄空冲刷的时机应在9月中下旬,泄空周期为4~5年。

Study on the techniques of sediment flushing and decreasing sedimentation in Shimen Reservoir

Shimen Reservoir,located in Hanzhong City,Shaan'xi Province,is a large water resources project.After 30 years running,the reservoir is suffered on severe sedimentation.The total silted sediment measured in 2002 reached 38 million m~3.The silted shape was mixed up delta with ribbon and was gradually developing to cone shape.Based on the analysis of the sedimentation development,source of the sediment and the measures to control sediment,the paper has analyzed the feasibility that in flood season discharging by density current and flushing by empty the reservoir can be adopted to decrease sedimentation and recover the storage capacity of the reservoir.The end of September should be the suitable time for flushing by empty the reservoir,and the periodicity should be 4 to 5 years.