Design of System for Monitoring Seepage of Levee Engineering Based on Distributed Optical Fiber Sensing Technology

Seepage is the major factor and monitoring index of levee safety. Leakage may be undetected by conventional monitoring methods and techniques, but optical fiber distributed temperature sensor (DTS) temperature measuring system can achieve real-time temperature monitoring in internal soil of levees. According to the temperature field obtained by DTS system, monitoring and inversion methods of seepage velocity based on double-line heat source and single-line heat source are introduced, respectively. An experiment is designed and composed of DTS temperature measuring system, the heating system, the water supply system, and the computer-aided analysis system to test and verify the effectiveness and feasibility of the monitoring method. On this basis, the system of monitoring seepage based on distributed optical fibers is put forward and designed. Optical fiber intelligent monitoring system will improve the current situation of safety monitoring of levee engineering on the basis of its unique superiority. 1. Introduction To protect cities, villages, mines, and factories on both sides of the river from devastating floods, levee engineering is constructed. Although levee construction technology for flood control has a history of several thousand years, levee engineering is not an exact science at present, because there are lots of random or uncertain factors during the project operation. Therefore, strengthening safety monitoring of levees is very important. The characteristics of levee engineering in China can be summarized as long distance; poor conditions in the levee foundation; poor quality of levee body filling; numerous ponds and lowland in the downstream areas; too many hidden dangers left by history; and lots of seepage disasters in flood season [1]. In view of the complex characteristics of levee engineering above, levee safety monitoring develops slowly and is not perfect compared with the dam safety monitoring, which needs further research and improvement [2]. With the social and economic development, the demand for flood control becomes higher and higher, and new thoughts of flood control and modernization of water conservancy give more arduous missions for management [3]. The digitization and information of engineering will greatly enhance the efficiency of project management, which will make a revolutionary change in management and method of levees. Safety monitoring of levees is not only beneficial to avoid dangers and disasters but also the precondition for prevention and forecast of levee disasters [4]. Seepage has always been an important