Abstract
Soil erosion is a serious environmental problem that can be controlled using bioengineering techniques. In using a bioengineering technique, temporary reinforcement is performed with geomeshes until vegetation takes root. In this study, structurally modified jute and coir geomeshes were tested for runoff erosion control and runoff volume over loamy sand at different slope angles. The laboratory results revealed that all parameters (slope angle, type of weave and type of material) had a significant effect on the erosion control performance of geomeshes. The slope angle contributed most (52.34%) to runoff erosion control, followed by weave type (25.79%) and type of material (12.28%). At lower and medium slope angles (of 15o and 30o, respectively) the twill-woven structure of coir geomeshes provided better erosion control than plain- and satin-woven structures, while plain-woven jute geomeshes demonstrated better erosion control at all slope angles. To understand the overall impact, a germination test was also conducted. According to the germination test results, the twill weave of jute geomeshes provided the highest rooting length. In general, plain-woven jute geomeshes are preferred for better erosion control on a high slope angle, while plain and twill can be used on a low slope angle.
Highlights
Soil is the unconsolidated material sediments and solid particle deposits of disintegrate rocks
Structurally modified jute and coir geomeshes were tested for runoff erosion control and runoff volume over loamy sand at different slope angles
The performance of structurally modified jute and coir geomeshes was evaluated at different slope angles
Summary
Soil is the unconsolidated material sediments and solid particle deposits of disintegrate rocks. The process of the transportation and detachment of top soil along with other organic materials by wind, water and human activity is known as ‘soil erosion’ [1,2,3] This has been the most prevailing problem since the 1930s and, after the 90 years of research, it is still a major concern of researchers. Among the various types of erosion, runoff erosion induced by runoff rainwater is the most common and results in various minor to major problems It leads to the loss of soil structure and other organic matter in the soil, along with other devastating problems, such as landslides, floods and desertification [8]. Limited studies are available regarding the performance of structurally modified jute and coir geomeshes, at lower, medium and higher slope angles
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