Influence of Erosion Control Materials and Plant to Erodibility Parameters Implemented by Laboratory Submerged Jet Erosion Test

Abstract

Erosion can cause many geotechnical problems, such as landslides, piping failure in dams, as well as riverbank retreat, which provides a huge impact on life and property. Currently, vegetation has been used in conjunction with engineering methods, namely soil-bioengineering, for preventing and controlling erosion effectively. In this study, submerged jet erosion tests were conducted to determine erodibility parameters (critical shear stress and erodibility coefficients) with soil samples collected from Motorway 7 (Bangkok-Pattaya). The erosion testing was carried out on the bare soil samples and covered by erosion control materials, namely erosion control blanket with Ruzi grass and erosion control mat with Bermuda grass. The results showed that critical shear stress significantly increased when covering the soil with erosion control materials, and the presence of Ruzi grass can also reduce the erodibility coefficient. The study results can imply the good effectiveness of how soil-bioengineering approach be used to prevent and reduce the severity of erosion.