The Yellow river of China is known for having its bed that is higher than the neighboring land. For centuries, the river dikes have been an imperative part of the protection for those who live along the river. The river dikes are massive with its total length in excess of 2000 km. Manual inspection from the shoreline has been used to monitor the integrity of the river dike below the muddy water surface. This procedure is time consuming and dangerous, thus making an automated system highly desirable. A feasibility study on the use of an optic fiber Bragg grating based ground deformation monitoring device was conducted as a potential means for automated safety monitoring of the Yellow River dikes. Inclined boreholes were drilled and the sensors installed from the inside of the river dike. The dike surface scouring causes an unloading effect on the underlying soil mass. By detecting the ground deformation results from this unloading effect, the dike surface scouring can be detected at its early stage. The paper describes the principles of the fiber optic monitoring scheme, results of field experiment and discusses the implications in the safety monitoring of Yellow River dikes.
IOS Press, Inc.
6751 Tepper Drive
Clifton, VA 20124
Tel.: +1 703 830 6300
Fax: +1 703 830 2300 email@example.com
(Corporate matters and books only) IOS Press c/o Accucoms US, Inc.
For North America Sales and Customer Service
West Point Commons
Lansdale PA 19446
Tel.: +1 866 855 8967
Fax: +1 215 660 5042 firstname.lastname@example.org