Erosion control nets

Geosynthetic-enhanced erosion control netting (ECN), open weave meshes, and ECBs. 

Erosion control netting More effective than tackifier (if properly anchored) Temporary (1—2 years) more costly than tackifier, netting may interfere with maintenance (if inadequately anchored)... 

Different horticultural items made of biodegradable polymers, such as plant pots, seed/fertilizer tape and binding materials, foams and nets for erosion control, offer reduction of system complexity by reducing the number of work steps. 

A further development of the OFB concept is erosion control and re vegetation blankets (ECRB). These are a combination of PA or PP staple fibre bound within two PP or PA nets. They have similar ground cover characteristics to the OFBs. However, the use of ultraviolet stabilised fibres provides for a much longer installation life than the organic blankets. 

Figure 4.3 Application of coir geotextile netting in erosion control and slope protection.

Erosion control blankets Low to moderate cost easy to install good moisture absorption very low sediment yield very good vegetative density Temporary (1—3 years) low to moderate flows Netting may interfere with maintenance (if improperly inadequately anchored)... 

When internal trans alkenes were subjected to diazoester in the presence of 80 CuOTf, cyclopropane ent-56, formed in high enantioselectivity, was slightly favored over its isomer (56). The use of ethyl diazoacetate improved diastereoselec-tion relative to the bulkier /-Bu ester. Unfortunately, ee values were somewhat lower with the ethyl ester, Eq. 39. Ito and Katsuki (56) propose the model in Fig. 7 to account for this selectivity. Approach of the trans alkene is controlled by the stereocenter on the bipyridines, directing the bulky group cis to the ester moiety. Larger esters lead to an increased steric interaction in this position and the net result is an erosion in reaction diastereoselectivity. 

The use of plastic netting against soil erosion has a very wide application for road and railway embankments and in soil stabilization in general. This application is well suited for time-controlled degradation. 

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