摘要
泥石流沟谷是一个复杂的地貌系统,有其发生、发展和衰退的过程。文章从系统科学和地貌学的角度出发,运用了能综合表述地貌演化特征的因子-地貌系统信息熵对泥石流沟谷进行危险度评价,研究以昆明市东川城区后山深沟、石羊沟和尼姑拉沟为试点,对各泥石流沟的信息熵进行了计算。结果表明,深沟和石羊沟的地貌信息熵值分别为0.124和0.174,泥石流沟谷正由发育的中年末期向老年期演化;尼古拉沟的信息熵值为0.246,正处于沟谷发育的旺盛时期,计算结果与当地实际情况有较好的一致性。
Debris flow gully is a complex geomorphic system. It usually go through the young stage, mature stage and old stage. This paper, in light of the system science and geomorphology, uses geomorphic information entropy which can be used to indict the characteristics of evolution of landforms to study debris flow gully and make risk assessment of debris flow gully. Taking three debris flow gullys of Dongchuan as cases, their information entropies are calculated. The results show that the information entropies of Shengou Gully and Shiyang Gully are respectively 0. 124 and 0. 174. They both are in the transitional period between mature stage and old stage. The information entropy of Nigula Gully is 0. 246 and it is in the mature stage. All these calculations are high consistent with the local condition.
出处
《灾害学》
CSCD
2005年第4期43-46,共4页
Journal of Catastrophology
基金
云南省"十五"攻关项目(2001NG44)资助
关键词
信息熵
泥石流沟谷
危险度评价
information entropy
debris flow gully
risk assessment
