A low-frequency debris flow took place in the north coastal range of Venezuela on Dec. 16, 1999,and scientists all over ......

通过2015年3月对北京密云水库上游白马关河流域内黄梁根桥沟现场调查,收集该区历史上泥石流灾害事件资料,对该沟的物源特征、降雨......