Revetment failure tests in the River Experiment Center

Lee, D. and Kim, M. and Kim, J. and Kim, W. (2018) Revetment failure tests in the River Experiment Center. In: Protections 2018 (3rd International Conference on Protection against Overtopping), 6-8 June 2018, Grange-over-Sands, UK.

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Abstract

The River Experiment Center (REC) at Korea Institute of Civil Engineering and Building Technology (KICT) is a real scale river experiment facility conducting R&D for river environments and flood response. Located floodplain of the Nakdong River, one of the largest rivers in Korea, the Center has over the total area of 193,051 m2 and three prototype channels with 600 m long and 11 m wide. Artificial floods are generated by large capacity pump with flow rate 10 m3/sec and the maximum velocity generated in the channel is over 5 m/sec. In the study several kinds of environmentally friendly revetments have been tested to find failure patterns and stability limits. Tested revetments are two kinds of concrete blocks with vegetation hole and two kinds of vegetation mats. Test procedure is referred to ASTM (D 7277, D 7276 and D 6460). Real scale revetments are installed in a steep sloped zone of the test channel. Water elevations and velocities are measured in each flow condition to determine the energy slopes. Bed changes in each flow conditions are measured by 3D Lidar and they are used to evaluate the failure condition. From the tests allowable shear stresses and failure patterns of the revetments are suggested. In the concrete blocks with vegetation hole, most damages are happened from the local scour in the vegetation holes. Vegetation mats reinforced by wire mesh show relatively high allowable shear stress.

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