Sizing riprap revetments for rivers protection against erosion processes
DOI:
https://doi.org/10.35305/curiham.v32.e13Keywords:
Sizing, Protection against Erosion, RiversAbstract
The development of a method for sizing riprap revetments to counteract erosion processes in rivers is presented. The proposed method is based on Shields’ dimensionless shear stress criterion, and allows for the simultaneous determination of the riprap diameter (d50) and its particle size distribution. The method was applied and compared with the methods of Escarameia and May (1992), Pilarczyk (1995) and Maynord (1995); using data of 33 experiments in a laboratory flume (Escarameia y May, 1992). The ratio between the d50 calculated with the proposed method and the d50 observed in the experiments ranges from 0.7 to 1.3 for 79 % of the selected tests. Similarly, with the Pilarczyk and Maynord methods, for the same range of variation in the d50 ratio, this percentage decreases to 64 % and 61 %, respectively. Moreover, with the method of Escarameia and May, the ratio between calculated and observed d50 ranges from 1 to 2.5 for 100 % of the selected experiments. The proposed method was also applied to sizing riprap in a hypothetical design situation and to protect a mooring Dolphin in the Paraná River.
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