徐向舟

个人信息Personal Information

教授

博士生导师

硕士生导师

性别:男

毕业院校:清华大学

学位:博士

所在单位:水利工程系

学科:水文学及水资源

办公地点:116024 辽宁省 大连市 高新园区 凌工路2号
大连理工大学 实验3号楼 431

联系方式:电话: 86-411-84708946 传真: 86-411-84708946 E-mail: xzxu@dlut.edu.cn

电子邮箱:xzxu@dlut.edu.cn

扫描关注

论文成果

当前位置: Chinese homepage >> 科学研究 >> 论文成果

Quantitative monitoring of gravity erosion using a novel 3D surface measuring technique: validation and case study

点击次数:

论文类型:期刊论文

发表时间:2015-01-01

发表刊物:NATURAL HAZARDS

收录刊物:SCIE、Scopus

卷号:75

期号:2

页面范围:1927-1939

ISSN号:0921-030X

关键字:Natural hazard; Gravity erosion; Topography Meter; Erosion volume

摘要:Gravity erosion is one of the most remarkable natural hazards in mountainous regions, especially on the Loess Plateau of China. Nevertheless, the measurement of failure mass is very difficult because gravity erosion usually occurs randomly and it combines with hydraulic erosion. Here, we present a novel testing technique that could quantitatively measure time-variable gravity erosion on the steep loess slopes. A structured-light 3D surface measuring apparatus, the Topography Meter, was designed and manufactured in our laboratory. Dynamic variation of the steep slope relief was monitored under rainfall simulation, and the slope deforming process was recorded by a computer video technology. With the help of laser marking, plane figures were vectorially transformed into 3D graphs, thus the shape of target surface was accurately computed. By comparing the slope geometries in the moments before and after the erosion incident on the snapshot images at a particular time, we could obtain the volume of gravity erosion and many other erosion data, including the volume of slide mass and the amount of soil loss eroded by overland flow. A series of calibration tests were conducted and the results showed that the accuracy of this technique was high and sufficient for exploring the mechanism of slope erosion. More than 120 rainfall simulation events were subsequently tested with the apparatus, further confirming its feasibility and reliability.