摘要
以泥石流起动条件为基础,建立了泥石流的判断预测法和计算预测法。据此对九寨沟泥石流加以预测,预测结果与实际情况基本一致。
Jiuzhai Gully,with a drainage area of 651km2 and a length of 46km from south to north,is located within 103°46′-104°50′E, 32°55′-33°20′N in northwest of Sichuan Province. Its maximum altitude is 4,764m at south peak and the minimum one is 2,000m. It is a join place of three structural systems and between subtropical and south temperate zones,as well as a transition belt from Qinghai-Xizang Plateau to Sichuan Basin. Therefore, debris flow is in activity. There are 31 debris flow gullies in the region. Debris flow directly affects the protection and development of Scenic Spot in Jiuzhai Gully.For calculating debris flow,the condition of debris flow initiation is regarded as a theoretical basis. Shuzheng Gully, a tributary of Jiuzhai Gully,is selected as simulation prototype. 94 experiments of debris flow initiation have been done with a mini-simulator. By analysing experimental results,the condition of debris flow initiation has been set up as follow.θ- 8. 01S,- 2. 49Sr2-[3. 49/( C - 0.10)3+ 7.02= 0where,θ is bed slope,Sr is saturation degree,and C is find-grained content.Based on the initiation condition, the prejudication way to discriminate between debris flow gully and non-debris flow gully and the calculation way to compute the possibility of debris flow occurrence are discussed. Some gullies in the region have been judged and forecasted with the methods mentioned above and the conclusions conform to reality.
出处
《山地研究》
CSCD
1991年第2期88-92,共5页
关键词
九寨沟
泥石流
预测
Jiuzhai Gully, debris flow, calculation
