APPLICATION OF OPTICAL FIBER SENSING TECHNOLOGY IN RAINWATER RUNOFF MONITORING

In view of the lack of monitoring of the effectiveness of various sponge facilities, complex means and low accuracy in the construction of sponge cities, by applying fiber-optic sensing technology to sponge urban permeable paving, the optical fiber grating temperature sensors were used as the monitoring method and the basic principle was the change in the output signal of the sensor on the water-permeable surface layer caused by changes in external quantity. With the rainwater penetration rate obtained and used as the core index, based on rainstorm data of Hubei, the simulation of different permeable pavements on rainwater runoff reduction was conducted under different recurring periods (1a, 5a, 10a, 50a, 100a). Based on the experimental data, the linear fitting relationships between the permeability of rainwater in the permeable surface layer and the permeable pavement to runoff reduction indicators were established. The results showed that there was a good correlation between the infiltration speed and the runoff reduction rate and the time of the runoff (R²>0.93、R²>0.92).The application of the system in high-speed railway stations in western Hubei area successfully proved the feasibility of using infiltration rate to monitor the time of runoff and runoff reduction rate.