Characteristics and Origin of Loess Landslides on Loess Terraces at Heifangtai, Gansu Province, China

摘要：

　　Over-irrigation can induce serious landslides on the slopes of loess terraces.Typical examples are the series of landslides happened in the last few decades on the Forth Terraces of the Yellow River at Heifangtai, Yongjing County, Gansu Province.The agricultural irrigations on the Heifangtai terraces began in 1960s.Due to the specific geological and geomorphological condition of the thick loess terraces, a great amount of irrigation water infiltrate into the loess causing serious landslide problems.The landslides at the Heifangtai can be classified into two different types based on their composition: loess landslides and loess-bedrock landslides, characterized with high-speed, long-distance sliding and low-speed, short-distance sliding respectively.Landslides caused by the over-irrigation have a special phenomenon of hysteresis development following long-term of irrigation, occurring in group and with high frequency.Most of the landslides happen in rain seasons and freeze-thaw periods.

关键词： loess terraces agriculture irrigation landslide disasters

作者: Weijiang Wu Xing Su Xingmin Meng

作者单位: Gansu Academy of Sciences, Geological Hazards Prevention Institute, Lanzhou,China

会议类型: 国际会议

会议名称: World Landslide Forum 3(第三届世界滑坡论坛)

会议地点: 北京

会议语种:英文

页码: 205-209

在线出版日期: 2014-06-02（万方平台首次上网日期，不代表论文的发表时间）