Unmanned Aircraft Systems-Based Photogrammetry for Ground Movement Monitoring

Unmanned Aircraft Systems-Based Photogrammetry for Ground Movement Monitoring

Type	Book Section
Author	Farid Javadnejad
Author	Daniel T. Gillins
URL	http://ascelibrary.org/doi/abs/10.1061/9780784479957.094
Publisher	American Society of Civil Engineers
Pages	1000-1011
Abstract	A major concern during installation or rehabilitation of buried pipelines are ground movements during construction. Unexpected ground movements, such as settlement or uplift, may be the result of geotechnical conditions, proximity to other structures and utility lines, contractor methodologies, and/or poor designs. Near-continuous monitoring of ground movements during construction is important to quickly identify and mitigate potential problems. A common method for detecting ground movement is to routinely measure the coordinates of discrete points along the ground surface during construction using high-accuracy survey equipment, such as automatic levels, total stations, and GNSS receivers. It is then possible to determine if the position of these points are changing with time. Although these survey equipment provide coordinates with millimeter- to centimeter-level accuracies, the equipment and often the surveyor must physically occupy the discrete points along a construction corridor in order to take the measurements. This paper presents a procedure for measuring and monitoring ground changes by utilizing digital photographs taken from an inexpensive, consumer-grade camera mounted on a small unmanned aircraft system (sUAS). The digital photographs were aligned and processed using a computer vision procedure known as Structure-from-Motion (SfM), which results in ortho-rectified, mosaicked aerial images and high-resolution digital elevation models (DEMs) of the construction site. After a series of UAS flights over time, the resulting DEMs from this method were differenced in order to detect and quantify ground movements. In an effort to define accuracy, results of the UAS-based measurements were then compared with measurements taken from a total station survey. The comparison yielded a vertical RMSD of 2 cm at the 95% confidence level.
Book Title	Pipelines 2016

The Research Development of Tubular Textile Composites Application on the Trenchless Pipeline Inversion Lining Rehabilitation Technology

The Research Development of Tubular Textile Composites Application on the Trenchless Pipeline Inversion Lining Rehabilitation Technology

Type	Journal Article
Author	Kai Luo
Author	Shu Jie Zhang
URL	http://www.scientific.net/KEM.671.306
Volume	671
Pages	306-314
Publication	Key Engineering Materials
Date	11/2015
Abstract	Tubular Textile Composites Lines in the Internal of Damaged Pipeline by the Trenchless Pipeline Inversion Lining Rehabilitation Technology,in the Form of “pipe in Pipe”for the Repair of Damaged Pipeline. Meanwhile, this Technology Uses Trench-Less Pipeline Repairing Technology and Process to Instead of Full Excavation for Replacing New Pipe , which is Not only Economic but Also Environmental Protection, Meeting the Demands of Modern Urban Development. In this Paper, it’s Mainly Uses a Variety of Trenchless Pipeline Inversion Lining Rehabilitation Technology to Describe Tubular Textile Composite Raw Materials, and to Compare its Molding Methods and Performance Evaluation. and then Making a few Suggestions for the Research and Development on Trenchless Pipeline Inversion Lining Rehabilitation Technology with Tubing Textile Composites.

The Development of Real-Time Leak Monitoring System for Management of Hazardous Material Pipeline

The Development of Real-Time Leak Monitoring System for Management of Hazardous Material Pipeline

Type	Journal Article
Author	Sookwon Chae
Author	Jaesoon Seo
URL	http://koreascience.or.kr/journal/view.jsp?kj=JNJBBH&py=2016&vnc=v12n2&sp=122
Volume	12
Issue	2
Pages	122-129
Publication	Journal of The Korean Society of Disaster Information
Date	2016-06-30
Abstract	A dual structured pipe for a preventive monitoring on a accident damage, a smartphone app program for a survey and a construction data collection and a server program for a real-time monitoring were developed. A pilot system was installed in the test field to analyze effects of a system developed in this study. The data for a damage prevention was detected by the attached sensors on the pipe. Exclusion was tested by the pressure sensors to be installed at regular intervals. The app and server programs was enabled to the real-time data collection and real-time monitoring linked by VRS survey equipments and a smartphone.