贵州开阳某危岩失稳形成堰塞湖影响范围分析

Analysis on the Influence Area of Barrier Lake Induced by a Dangerous Rockmass in Kaiyang, Guizhou

在峡谷河流区,危岩失稳产生的崩塌堆积体堵塞河道形成堰塞湖,进而甚至出现溃决行成洪水,是崩塌重要的次生灾害链之一。对特定的某一崩塌而言,分析其未来发生时可能形成的堰塞湖规模及其影响范围就显得尤为重要。本文结合贵州开阳某危岩实例,在阐述危岩所处地质环境条件和危岩特征基础上,计算分析了可能形成的堰塞湖高度、水体体积、回水影响范围,以及一旦溃决形成洪水可能影响的范围,取得的成果可直接用于该处地质灾害风险评价中。

In mountainous river area, the barrier lake and its induced flood is one of the most important disaster chains for dangerous rockmass or avalanche. To assess the geohazard risk, analysis on influence area of barrier lake is needed. In this paper, taking a dangerous rockmass in Kaiyang, Guizhou as an example, based on the geological conditions and dangerous rockmass feature investigation, the dam height, area, volume, and flooding area of the potential barrier lake were discussed in detail. The results can be used directly in later geohazard risk assessment.