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Last modified
1/26/2010 2:20:06 PM
Creation date
10/12/2006 1:18:12 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8062
Description
Federal Water Rights
State
CO
Basin
Statewide
Date
10/24/1983
Author
S A Schumm
Title
River Meanderings - Proceedings of the Conference of Rivers - 1983
Water Supply Pro - Doc Type
Report/Study
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<br />14 <br /> <br />alVEI. MIlANDEIlINO <br /> <br />Ind ti.... <br /> <br />j <br />I <br /> <br />Sensitivity: <br /> <br />Rivers respond differently to changed conditions, therefore rivers <br />Cln be sensitive or Insensttlve (3. 32). For exampl., changes of river <br />plttern IIlI1 be triggered by ..l.tivelYlllnor changes of. controlling <br />vlrllble If the glOlOrphtc condlttons hive developed to threshold con- <br />ditions Of Incipient Instability (22). Therefore, I III nor input IIlI1 <br />ClUse I .major chlnge .t one loc.tlon, but .Is"""re in the river systell <br />it IIIIY hive Httl. or no effect. <br /> <br />The relSon for such. ..rl.bl. response IIIIY be the exlst.nce of <br />threshold condittons, which ~ exceeded produc. I llrge chlnge. In <br />contr.st, Ipparently sl.ll.r rlv.r relches IIlI1 shOw little or no <br />response to I SillllIYCh.nr' Thus, within. river syst.. c~osed of <br />slngullr relches there vtl be sensttlv. .nd Insensitive ro.ches. The <br />sensitive chlnnels will respond slgnlflc.ntly to perhaps even I lIioor <br />chlnge but certainly to a Ilrge hydrologic .vent. for eXallPle, sedl- <br />rent may Iccuoullte In . v.lle, or chlnnel until It Is trenched or <br />flushed during In Ipp.rently nOnlll hydrologic event. The sedt...nt <br />IcculllUhtlon hid re.ched . gradient threshold of Instlbillty. In <br />Iddttlon, I series of ..anders IIlI1 grow In .-plltude until I cutoff <br />is inevitlble. The cutoff ,,"nder WIS sensitive; the others were not. <br />Ilthough 111 were slngul.r. <br /> <br />At locltlons bind c-d on Figure 4 there Ire river plttern or <br />sinuosity thresholds. Obviously. channel thlt plots on this dllgr~ <br />nelr b or c is sensitive. Those plotting to the left of b or c or <br />nelr e Ire Insensltlv. and their patterns .re rellttvely stlble. <br /> <br />C~lexlty: <br /> <br />The final problem is the COIIPlexlty of the response of . geomo'l'hlc <br />Syst.... The cOllPlu systtll Itself, when Interf.red with or ,"",Ifted <br />Is unlble to .djust In;& progresstve Ind systlDltlc flshlon (22). <br />Rather the IIOv_t of a WIve of reJuvenation Into I drllnlge syst... <br />will Iffect clownst.... channel ....ches long befo.. the up.t..... relches <br />Ire .ffected. this will ,".te a sltu.tion In which tt Is very <br />difficult for. flven ....ch of. chann.1 or. given tributsry to Idjust <br />. progressfVllly. n f.ct,. there vlll.be buntlnv for.. "'" condition of <br />stlblllty (fig. 5.), whfch Is ref.rr.d to IS cOllPle. respon..'(22). In <br />high energy Sysu. the behavior un .ven be .plsodlc with pertods of <br />Iggrldltion Interrupting degrldatlon (Fig. 5b) until I new condition of <br />stlblllty has been .chleved (Fig. 5b). this produces I very compl.x <br />geomorphic record, the details of which c.nnot be Ittrlbuted to ute""l <br />influences but rlther to the Internal .djustoent of the Systell Itself. <br /> <br />for exaq>l.. strelllS crossing the Canterbury Plain of New Zelland <br />hive Incised Into gl.cl.l outwash, Ind streams In the Sterrl Nevldl of <br />Callfomll hlv. Incised Into hydraultc IIlnlng d.brls to produce <br />numerous -defJradlt1on.l terrlces.. These unpli1red terraces reflect <br />pluses In downcutttng .s the channels became clogged with stdt...nt, <br />Some tributaries of the Belr Ind YUbl Rivers In elllfomll hive IS IIIny <br />IS 12 unplired terr.ces (Fig. 6), .11 of which formed slnee 1880 (31). <br /> <br />u:> <br />.~ <br />to- <br />...-4 <br /> <br />'. <br /> <br />, <br />.~; <br /> <br />., <br /> <br />":'or <br /> <br />i <br />{ <br />I <br />. <br />. <br />, <br />t Fig. 5.' <br />t. <br />t <br />I <br /> <br />R1VE1l. MORPHOLOOY AND BalAV/OR <br /> <br />2S <br /> <br />CHANNEL 1 <br />81lU081TY <br /> <br />c <br /> <br /> <br /> <br />e <br /> <br />b <br /> <br />e <br /> <br />STREAM POWER -... <br /> <br />Fig. C. Dlagr.. shcwirq c:honge ot chIlnne1 I'8ttem (Ilnuoelty) .. <br />otr_ ~r inc_, .. a rt8Ult ot increased valley <br />fl<x>r dope. Below b the chIlnne1 1JI Itralgllt ind ..... d <br />it 1JI braided (trCllll sotu. and _, U721. <br /> <br />. <br /> 1 <br /> ~ , <br /> c . <br /> >> <br /> , <br /> . <br /> -- <br />. <br /> 1 <br /> ~ <br /> c <br /> >> <br /> ; <br /> , <br /> <br /> <br />-- <br />Dlagr... liluetrating (AI <rIIpl.. r_ and IB) laodl <br />~r:;:' ~~_~, CllHl~~~ 1JI affected at tift ~ by I C <br />. -....- or -~ c:honge that un..- <br />degradatlat. Wh!n tha lopct 1JI relatively IIIlI.1l (AI <br />the str_ dogradee, aggradea and dog adee <br />~tiat ot rdati". Stability 1JI ac:tJ_ ~~ :.- WIlBI <br />c:honge 1JI 1a<91 an/! larqe quarltltlea ot ~ . <br />1IIOYed (B), _jor dogradatiat 1JI Interrupted are <br />=~at~ re.:.,ti.... atabllity il echl~;~~tb <br /><rIIplex response of A ~:~tent ot aggr~lon. -n. <br />at the diagrID of episodic eroslat apeceB bttw<<l a an/! b <br />. . . <br />
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