受娜尼拉现象的影响，１９９９－１２－１５～１６委内拉北部阿维拉册区加勒比海沿岸的８个州连降特大暴雨，造成山体大面积滑塌，数十条沟谷同时暴发大规模的泥石流。泥石流造成３万人死亡、经济损失高达１００亿美元，成为本基纪最严重的泥石流灾害，这次泥石汉灾害具有群发性、规模大、低频率和直接入海等特点，对这类泥石流进行泥石流成因、活动规律、预测预报、泥石流与异常气候现象关系和直接入海型泥石流运动规律，沉积特征、对悔水的污染扩散过程以及防治对策的研究具有重要意义。

Influenced by La Nina Phenomena, A continuous heavy storm appeared in eight states of Venezuela along Caribbean coast and Avila mountain in Dec. 15-16, 1999. In the heavy storm, a lot of landslides and collapses occurred in northern slopes of Avila mountain , and about 30 debris flows came out from the valleys. The severe debris flows washed off and buried the town, highway, killed more than 30,000 people, and made economic loss about ten billion dollars. It was the most serious debris flow disaster in the 20th century. The debris flows were characterized by lot of debrisflows occurring at the meantime, large scale, low frequency and flowing into sea directly. It′s important and necessary to make further research on the genesis of the debris flows, prediction, the relationship of debris flow and abnormal climate, the movement and accumulation of debris flow in the sea and how to control the debris flow.