A photogrammetric method for laboratory-scale investigation on 3D landslide dam topography

  • PDF / 2,331,638 Bytes
  • 16 Pages / 595.276 x 790.866 pts Page_size
  • 85 Downloads / 253 Views

DOWNLOAD

REPORT


ORIGINAL PAPER

A photogrammetric method for laboratory-scale investigation on 3D landslide dam topography Hao Wu 1 & De-feng Zheng 2 & Yan-jun Zhang 3 & Dong-yang Li 1 & Ting-kai Nian 1 Received: 10 January 2020 / Accepted: 28 May 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020

Abstract Topography is a crucial characteristic reflecting the stability status of a landslide dam. The methods for measuring landslide dam topography in a laboratory-scale test study are currently operator dependent, time-consuming, or only applicable to the measurement of the two-dimensional section. In this paper, a laboratory-scale photogrammetric method based on the structure from motion (SfM) technique was proposed to measure the three-dimensional (3D) topography of a landslide dam. The SfM technique, which is a revolutionary, low-cost, user-friendly computer vision technique, was employed for reconstructing a landslide dam 3D computer model. A scientific method to determine the topography parameters of a landslide dam was put forward. Meanwhile, two materials with different particle sizes were used to simulate the formation process of the landslide dam in the laboratory-scale. Then, the measurement results of the two materials were compared. Five parameters of a landslide dam topography with 100 parallel measurement results for each parameter were obtained. The results show that the SfM technique could build a high-quality 3D point cloud in a laboratory scale. The proposed method of determining the topography parameters of a landslide dam was useful and has low measurement uncertainty. The material type affected the sparse density of the point cloud and then affected the measurement uncertainty of landslide dam topography parameters. The measurement uncertainty of the gravel-type landslide dam was significantly higher than that of the sand-type landslide dam. This research contributes to promoting the application of a photogrammetric method based on the SfM technique in geotechnical engineering laboratory-scale tests. Keywords Photogrammetric method . Structure from motion technique . Landslide dam disaster . Three-dimensional topography . Non-contact measurement

* De-feng Zheng [email protected]

Introduction

* Ting-kai Nian [email protected]

Landslide, rockfall, and debris flow, caused by slope instability, are the most common mass movements in mountainous areas throughout the world, threatening the safety of human life and property (Nian et al. 2020; Sassa et al. 2015). The mass movements may move into valleys and block rivers, resulting in the formation of landslide dams (Casagli and Ermini 1999; Costa and Schuster 1988; Shrestha and Nakagawa 2016; Zhang et al. 2013). Landslide dams consist of a mixture of soil and rock and may fail in a short time, causing catastrophic disasters for defenseless downstream areas (Costa and Schuster 1988; Cui et al. 2009; Dai et al. 2005; Kidyaeva et al. 2017). Assessing the stability status of a landslide dam in a limited time is an important task. However, the stabil