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<br />3 <br /> <br />'" <br /> <br />C. Relations for rivers--continued <br /> <br /> W = aQb <br />Fe. .,.... i./r. f,\ <br />'~--,,~- ><.- ,,( , D = cQf <br />r;:,'" V KQm <br />",.---'-" = <br /> G = PQJ <br /> 7 <br /> S = tQ- <br />. ..j'~.. = rQY <br /> n <br /> <br />These channel geometry relations are <br />useful to evaluate channel character~ <br />istics both at a station and along <br />the river system. See Table on Page 3 <br />of changes, IV, for coefficients and <br />exponents in the equation. Greater <br />refinement of relations can be <br />achieved by refining with local field <br />data. <br /> <br />Dominant discharge <br /> <br />Function of: <br />Flow <br />Transport <br />Time <br />Channel characteristics <br />Bed and bank material <br /> <br />r a WT <br /> <br />n <br />r a d <br />II... <br />\0(61 \ <br /> <br />Radius of curvature varies with dis- <br />charge. At large d i sch;lrges the <br />thalweg may shift on to the point <br />bar and cut a chute channel. <br /> <br />f-rl\: <br /> <br />. . dSO <br />Qs'C a QS <br />w <br /> <br />Qualitative evaluation of river <br />stability and response to change of: <br />sediment discharge, Qs: size of bcd <br />material, dSO: concentration of wash <br />load, Cw: . water discharge, Q: and";"'~- <br />slope of energy gradient, S. All <br />variables may be changing simultaneously. <br /> <br />_\7,;- ., ;V-'ll~,L <br /> <br />D. Remote sensing <br /> <br />Remote Sensing <br /> <br /> <br />. . ~BlaCk & Whi te <br /> <br />Color <br />Photography C 1 I f d <br />. 0 or n rare <br /> <br />Thermal <br /> <br />By using acria I photos, prcfcrab I y <br />color infrared, one can identify <br />sediment sources, p I aces of depus i t i on. <br />channel instability, and with sequential. <br />photography one can identify changes in <br />river form and changes in the position <br />of a river over time increments. <br /> <br />111,1..: (,,~) ~ '!": 1,,1,- <br /> <br />;:'1/:.,',",,..., <br />