Marine revetments

Revetments may be exposed or submerged. Exposed revetments have to resist marine hydraulic forces continually whereas submerged revetments only have to resist marine hydraulic forces intermittently (when they become exposed). Exposed 

Potential slip failure surface Rock fill 

After Lawson, C.R., 2008. Geotextile containment for hydraulic and environmental engineering. 

In fulfilling their role, geotextile filters must meet specific hydrauhc, mechanical and durability requirements. These are described in more detail subsequently. 

Kendall et al. (2014) also proposed an empirical relationship based on this energy concept for the required mechanical resistance of geotextile filters in marine revetments. The relationship proposed is (Eq. [20.4])  

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PIANC, Guidelines for the design and construction of flexible revetments incorporating geotextiles in marine environment. Report WG 21, PTC II, Supplement to Bulletin No. 78/79, Bmssels, Belgium (1992). 

Geotextile bags are used for a range of marine engineering applications. These include revetments (Fig. 20.3(a)), groins (Fig. 20.3(b)), artificial reefs (Fig. 20.3(c)), slope buttressing (Fig. 20.3(d)), scour prevention (Fig. 20.3(e)) and temporary protection dykes (Fig. 20.3(f)). Some of these applications are discussed in further detail later in this chapter. 

Figure 20.3 Marine engineering applications of geotextiie bags, (a) Revetments, (b) groins, (c) artificial reefs, (d) slope buttressing, (e) scour prevention and (f) temporary protection dykes.

Geotextile tubes are used for a range of marine engineering applications including revetments (Fig. 20.8(a)), offshore breakwaters (Fig. 20.8(b)), protection dykes... 

Figure 20.8 Marine engineering applications of geotextile tubes, (a) Revetments — exposed and submerged, (b) offshore breakwaters, (c) protection dykes, (d) containment dykes, (e) training walls and (f) groins.

Geotextile bags are also used for revetment stmctures in marine environments (Fig. 20.11(b)). Here, the bags act as the primary armour protection, with stability behaviour provided by the mass-gravity of the bag units and their pattern placement. Fig. 20.13 shows a geotextile bag revetment in a marine environment in which the bags have been placed in a specific pattern-placement layout to maximise stability. 

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