lecture notes on slopes

8/13/2019 Lecture Notes on Slopes

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Part 6Part 6

BIOTECHNICALBIOTECHNICALSLOPESLOPE

PROTECTIONPROTECTION


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VegetationVegetation plays a crucial role in soilplays a crucial role in soilconservation an erosion controlconservation an erosion control


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Hy rosee ing using

!escue an "il !lo"er#i$es are co##onlyapplie to gra e slopes!or %erosion control &'

T(e e!!ectiveness o!grass see ing epen son t(e #aturity) ept()an ensity o! t(e root

mat BE*ORE (eavyprecipitation i#pacts t(eslope& +atering #ay ,ere-uire prior to onseto! t(e rainy season&

H./ROSEE/IN0H./ROSEE/IN0


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Biotec(nical slope protectionBiotec(nical slope protection e#anate !ro#e#anate !ro#t(e (u#i cli#es o! "estern Europe) "(ere itt(e (u#i cli#es o! "estern Europe) "(ere it(as ,een e#ploye !or (un re s o! years&(as ,een e#ploye !or (un re s o! years&T(is vie" s(o"s a !ill e#,an1#ent a,oveT(is vie" s(o"s a !ill e#,an1#ent a,oveBer1eley in 2345) ,e!ore it "as plante &Ber1eley in 2345) ,e!ore it "as plante &


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0ro"t( o!0ro"t( o! "illo""illo" "attles"attles plante on 0ri ly Pea1plante on 0ri ly Pea1!ill slope uring su##er o! 2347& T(e "attles!ill slope uring su##er o! 2347& T(e "attles"ere not irrigate uring 8 #ont(s o! ry"ere not irrigate uring 8 #ont(s o! ry

"eat(er) so losses "ere signi!icant&"eat(er) so losses "ere signi!icant&


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+illo" "attles+illo" "attles plante along contours o! !illplante along contours o! !illslope epicte a,ove) as vie"e in 2348) t"oslope epicte a,ove) as vie"e in 2348) t"oyears later& Si#ilar sc(e#es "ereyears later& Si#ilar sc(e#es "eresuccess!ully e#ploye along t(e Angelessuccess!ully e#ploye along t(e AngelesCrest Hig("ay 9State Route :; in sout(ernCrest Hig("ay 9State Route :; in sout(ernCali!ornia uring t(is sa#e perio 92348


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LiveLive +illo" "attles+illo" "attles are prepare ,y "rapping tu,e


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Stra" +attlesStra" +attles

Stra" "attles are an ine$pensive) al,eitte#porary) #eans o! e!lecting s(eet !lo" !ro#pave sur!aces

Stra" "attles or %!i,er rolls' are organic,io egra a,le en(ance#ents t(at areco##only e#ploye to assist erosioncontrol) until eeper rooting vegetation isesta,lis(e & T(ey can ,e a!!i$e to t(eslope using "oo sta1es 9s(o"n (ere; or%live sta1es)' 9"illo" s(oots; usually) in

cree1 ,an1 settings&

Source EPA

Lap etail pave#ent

>ero s(oul er transition


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HarvestingHarvesting"illo"s to #a1e"illo"s to #a1e

"attles"attlesCree1 "illo"s canCree1 "illo"s can,e (arveste in,e (arveste int(e springti#e tot(e springti#e toconstruct "attlesconstruct "attlesor !ac(inesor !ac(ines

T(ey are usuallyT(ey are usually1ept #oist until1ept #oist untila!ter typing ana!ter typing an

,urial,urial


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Ba#,oo !ascinesBa#,oo !ascines are use e$tensively to protect cutare use e$tensively to protect cutslopes in Asia) suc( as t(is e$a#ple in Tai"an& Inslopes in Asia) suc( as t(is e$a#ple in Tai"an& InEurope !ascines are usually #a e o! cree1 "illo"Europe !ascines are usually #a e o! cree1 "illo"

c(utes&c(utes&


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BR?SH LA.ERSBR?SH LA.ERS

Brus( layers are #a e o!Brus( layers are #a e o!!res(ly cut cree1 "illo"s)!res(ly cut cree1 "illo"s)"it( t(eir ,utts ,urie in"it( t(eir ,utts ,urie int(e ,an1) as s(o"nt(e ,an1) as s(o"n

T(ey can ,e very cost


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An e$pan a,le stinger attac(e to an e$cavator ,oo#)An e$pan a,le stinger attac(e to an e$cavator ,oo#)as s(o"n a,ove) can plant nursery stoc1 on steepas s(o"n a,ove) can plant nursery stoc1 on steepslopes or in riprap 9i#age !ro# /an Culley o! /aytonslopes or in riprap 9i#age !ro# /an Culley o! /aytonTractor Crane Co&) via *H+A;Tractor Crane Co&) via *H+A;

lecture notes on slopes

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