Evaluating Erosion Risk of Revegetated Cutslope with Seed Spraying

Abstract

Slope revegetation refers to the use of vegetation and construction to protect a barren slope devastated by road and building construction. Among many revegetation strategies, hydroseeding has been widely utilized to stabilize barren slopes and has become the representative approach. Previous studies on slope stability have been conducted from a civil engineering perspective, mainly evaluating the stability of cut-slopes on solid bedrock and the use of concrete structures to stabilize devastated slopes. This study was conducted to develop a method to evaluate erosion risk of revegetated cut-slopes, based on criteria derived from previous studies. Twenty-five factors were surveyed on both on-the-spot erosion slopes and non-erosion slopes after slope revegetation to compare slope types. The scores of all non-erosion slopes exceed 80 score while erosion slopes are 80 below. Erosion slopes got the range of 68-74 score while non-erosion slopes got the range of 81-100 score in the first result which was not applied for weighted-values. The scores of all non-erosion slopes exceeded 3.10, while erosion slopes were below 3.10. Erosion slopes were in the range of 2.73-3.09, while non-erosion slopes were in the range of 3.15-3.90 in the second result, which was applied with weighted-values according to the AHP result from a previous study.

Decision Analysis of Slope Ecological Restoration Based on AHP

“…Not only it brings the recent economic loss and potential hazards to geological stability, but also the environmental problems due to these geological disasters and landscape variation will affect descendants. Ecological restoration is the important measures for prevention of geological disasters and the protection of ecological environment (Kil 2016;Kil et al 2016). The main form of it was planting vegetation simply and now it develops into the combination of planting measures and engineering measures .…”