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Environmental restoration ability of GXP method
Case of Mojeon River refurbishment works in Mungyeong City(4 months)
Direct pot planting
View of vegetation 60 days after planting
View of vegetation 120 days after planting
Measurement of the extent of slope recognition 60 days after construction
Soil restored with plant roots
After 60 days of planting, we took the samples and found that the roots were tangled together, making the soil firmly adhered. In addition, weeds did not survive due to the vegetation mat, and a planted single herbaceous community was formed which is a typical way of river restoration.
Plant growth rate
We collected the plants 60 days after planting and found that plants grew at a remarkable rate. As shown in the picture, root measured 50cm in length, the stem was 80cm long, and it was found that complete community was formed which measured 130cm in full length.
Problems of conventional construction methods
Conventional river refurbishment has focused on disaster prevention and river use rather than environmental aspects. As a result, development of revetments using concrete has led to devastation of river environment, contamination of water and disturbance of ecosystem. In recent years, restoration of rivers has been bolstered by development of various methods. However, this has also caused many problems to early greening due to low germination rate and low rooting rate which are attributable to vegetation method involving the use of concrete or seed spraying without stabilizing the soil of revetment, the environment for vegetation. In order to solve these problems, slope stability for vegetation environment essential for early greening is required, along with high density planting for high rooting rate. Maximum effort is needed to restore the rivers in which the plants form communities.
Advantages of GXP Vegetation Method
Advantages of GXP Rrevetment Vegetation Mat include disaster prevention effect and environmental advantages.
For environmental advantage, it completely overcame the biggest challenge, the slope stability, for vegetation through GXP mat construction. It enables early greening within 45 days while maintaining a rooting rate of over 98% through high-density direct planting on stable slopes, unlike conventional methods that have failed in vegetation due to low germination rate and rooting rate. As the multi-layered fiber layer fundamentally prevents growth of weeds, except for selected herbaceous crops, perfect community of selected single herbaceous plants can be created, resulting in creation of very beautiful scenery and revitalization of ecosystem.
Water control and disaster prevention capabilities of GXP method
Problems of conventional construction methods
Conventional vegetation revetment had the revetment built by using the weight of concrete, and vegetation was planted on a small amount of soil above the concrete which led to the problems of failure of rooting and loss of herbaceous plant even when the amount of rainfall is small. As result, disaster prevention effect was not provided through combination of herbaceous roots and soil in many cases. Furthermore, the matting method led to incomplete fixation of revetment and mat, and as a result, whole mat was curled and lost due to high flow velocity even when one side of the mat was slightly lost. In addition, seed method led to low germination rate and low growth rate, and various kinds of grasses grow at a low density and failed to form a community, and their roots were not tangled to each other which led to failure to achieve slop stability. Consequently, slope collapse, sliding phenomenon, slope erosion, etc., occurred, causing much damage, during heavy rains.
Advantages of GXP Vegetation Method
GXP Vegetation Method is used for high-density direct planting of 20 to 27 vegetation per ㎡ on the slope mounted with X-shaped fixing pins which are densely fitted to multi-layer mat containing the gabion. In that way, complete greening is formed within 45 days after construction. When this method is used, plant roots, X-shaped fixing pin, gabion, and multi-layer mats are tangled together to fundamentally stabilize the slope by net effect, pile effect, and erosion prevention effect and to prevent damage such as slope collapse, erosion and sliding in heavy rainfall. In addition, the shear stress of revetment was increased due to multi-layer mat and X-shaped fixing pins mounted densely on the revetment to fundamentally prevent mat curling caused by flow velocity. It is an excellent method that can be an effective countermeasure against scour through integration with basic scour protection.
Pile effect of X-shaped fixing pin
By applying the slope depth X-shaped fixing pins to multi-layer mat containing the gabion, the pins can be anchored to the slope with roots of herbaceous plant to maximize the pile effect and maintain high shear stress.
Net effect of roots
With the slope depth fixing pins fitted to multi-layer mat, stability of the slope can be achieved with the roots of herbaceous plant, and the pile effect is maximized to maintain high shear stress.
flow velocity reduction effect with vegetation
With the slope depth fixing pins fitted to multi-layer mat, stability of the slope can be achieved with the roots of herbaceous plant, and the pile effect is maximized to maintain high shear stress.
Mat curling prevention effect
The X-shaped fixing pins were fitted deeply to the slope in pairs per square meter of multi-layer mat containing the gabion to fundamentally prevent mat curling which otherwise causes entire mat to collapse when flow velocity is high.
Integration with scour protection
As revetment is integrated with gabion scour protection, it provides excellent protection of revetment against scour and helps create habitat environment for aquatic plants and fish.
Anti-erosion effect
After greening of vegetation planted on multi-layer mats containing the gabion, the soil, root, stem and multi-layer mats provide excellent prevention of slope erosion.
Revetment protection capability of GXP method
Measurement of allowable tractive force against flow velocity
Classification of slope protection method, depending on allowable tractive force
| classification | Slope protection method classification | Allowable flow rate(M/SEC) | Allowable tractive force(KG/㎡) | Remark |
|---|---|---|---|---|
| Vegetation hole | Block-sod, herbaceous type, seeding | 2.0 | 2 | At the time of rooting |
| Plant mat | 3.0 | 8 | Department of Civil Engineering, Kyungpook National University | |
| GXP Revetment Vegetation Mat | 5.0 ~ 6.0 | 20 ~ 30 | Field Measurement by Research Team led by Professor Ko Soo-Hyun | |
| Gabion | Mattress type, etc | 5.0 ~ 6.0 | 20 ~ 30 | |
| Stone combination | Masonry | 5.0 ~ 8.0 | 30 ~ 80 | |
| Concrete block | Rectangular block, etc. | 3.0 ~ 7.0 | 15 ~ 60 | |
| Retaining wall | Concrete | 5.0 or higher | 50 ~ 80 |
