Ž . This paper describes a newly developed stepped-frequency ground penetrating radar SFGPR prototype operating across the 10–620 MHz frequency band. The SFGPR system has been developed to improve the maximum penetration depth Ž . capability of ground penetrating radar GPR applications without degradation of resolving power. The radar has the unique capability to employ a short gate at each fre...

This study determined total suspended sediment (TSS) at six stream crossings that represented a range of site conditions and forest operations in the Piedmont of North Carolina. Two wood and three steel bridgemats and one culvert were installed to cross the streams. The road classes for the crossings included four temporary skid trails and two permanent forest haul roads. Baseflow and stormflow...

Lake Moraine (42 50’ 47” N, 75 31’ 39” W), in Madison County in east-central New York State, is an artificially raised impoundment originally formed by the damming of a valley by the deposition of glacial moraine. This 106 ha (261acre) water body comprises two distinct basins separated by Madison County Rt. 87 traversing a causeway between them. A submerged culvert under the highway joins the n...

The structural performance and soil–structure interaction mechanism of a 7.3 m span, reinforced concrete (RC), three-sided culvert (TSC) with flat top slab are investigated through field monitoring numerical analyses. was instrumented six pressure cells 14 strain gauges. Data were collected during after construction. Two-dimensional finite element models validated against the measurements. then...

• A novel lattice model to capture nonlinear ballast behaviour is developed The included in a 2D railway track with transition zone Ballast compaction on its own cannot cause progressive deterioration of the Locations tracks where significant variations properties occur are subject increased deterioration. To successfully mitigate this, mechanisms leading need be understood. this end, work pres...