LABORATORY STUDIES OF A COMPOSITE GEOMAT COATING FILLED WITH CRUSHED STONE AND REINFORCED WITH RYEGRASS

Abstract

Purpose: to determine the roughness coefficient of a protective coating consisting of Enkamat 7225 geomat filled with small crushed stone from 6 to 10 mm and soil seeded with perennial ryegrass. Materials and methods. The hydraulic studies conducted by the authors were aimed at determining the roughness coefficient of the studied coating made of composite material (geomat). This study was carried out on an experimental setup of trapezoidal cross-section with vertical right (m = 0) and inclined left (m = 1) slopes. The total length of the section with the coating was 8.6 m. The slope of the flume bottom was i = 0.010...0.03. Results. The article presents the results of experimental studies devoted to determining the roughness coefficient of a composite coating made of geomat filled with crushed stone and reinforced with ryegrass. The average value of the roughness coefficient is derived and the analysis of the obtained results is performed. Based on the analysis conducted and after calculating the roughness coefficients by three formulas: Manning, Gangulyer-Kutter and N. N. Pavlovsky, it is possible to recommend for the studied coating the value of the roughness coefficient n = 0.0301, calculated using the Manning formula. Conclusions. The conducted studies, which are devoted to the roughness coefficient assessment for the investigated anti-erosion protective coating, have shown the possibilities of using such lining in practice. The use of this coating gives a natural look without losing the protective properties to the soil structure slope, the watercourse bed and banks.

Keywords

• coastal protection
• anti-erosion coating
• geomat
• water erosion
• grass seeding
• roughness coefficient
• hydraulic resistance