“5.12”地震后陇南某泥石流沟发展趋势分析

Characteristics of some debris flow gully and development tendency in South Gansu Province after 5.12 Wenchuan earthquake

为了解陇南地区泥石流多发区在"5.12"地震后泥石流的发展趋势,为该地区今后泥石流的防治提供科学依据。以某泥石流沟为例,详细分析了该泥石流沟的自然地质条件,泥石流特征,对其今后的发展趋势和危害程度进行了预测。调查分析结论认为:该沟在震后固体松散物质增加,存在发生大规模泥石流灾害的条件,对其下游震后重建的集中安置点及在建的高速公路安全构成威胁。提出了拦排结合、以拦为主、并辅以生物防护治理措施的建议。

In order to acknowledge the development tendency of debris flow-prone area in South Gansu Province after 5.12 Wenchuan earthquake,and provide scientific basis for the prevention and control of debris flow of this area in the future,we analyze natural geological conditions of the debris flow gully,the characteristics of debris flow with an example of some debris flow gully;meanwhile,we predict its future development tendency and degree of hazard.The results show that the increasing solid unconsolidated materials of the gully after earthquake is potential inducing conditions for massive debris flow hazards,which will threat the safety of the settlement site for earthquake reconstruction on its lower reach and the highway in construction.We propose solutions that combining interception with discharging.The interception is focused and the biological protective measures are supplemented.