Laserfiche WebLink
<br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />CONTENTS <br /> <br />Pnrrace__~~________________________________ <br />Symbols and units_ _____n__unnn_n_n__ <br />Abstract___________________________________ <br />Introduction_______________________________ <br />Acknowledgrnents___________________________ <br />Collection of field data_ u _n___nnn_n_n_ <br />Selection of site____ ____nn___n_nnn__n_ <br />Field survey _... _ _ un___nn_______nu_n__ <br />Vertica! controLn _........................ _ __... __...... __......... <br />Peg test. _ ___nn________n___n___ <br />Adjustment of instrument____ _______ <br />Horizontal controL _ _______________n ___ <br />Fi~d notes_____________________________ <br />Surveying equipment___ u_______________ <br />Hints on surveying_n___________________ <br />Groundplan___________________________ <br />High-water marks... __ _______n______________ <br />Surge_________________________________ <br />Identification and rating of high-water <br />rnarks_______________________________ <br />Types of high-water marksn___nnnh__ <br />Determination of gage height____ _________ <br />Cross sectiollS_ _____________________________ <br />Survey________________________________ <br />Soundings_ _ _ _ _________________________ <br />Scour_________________________________ <br />Measurement of horizontal distances_ _____ <br />Field notes_____ _____ ___ ______ ____ _ _ ____ <br />Photographs_______________________________ <br />Historical data__ _________n____u___uu__~ <br />Sampling streambed materiaL________________ <br />Definition__ __ _ _ _ _ __ _ _ _ _ _ _ __ _ _ __ _ _ _ _ __ __ <br /> <br />Pale <br />III <br />VI <br />1 <br />1 <br />2 <br />2 <br />3 <br />3 <br />3 <br />4 <br />5 <br />7 <br />7 <br />8 <br />10 <br />10 <br />11 <br />11 <br /> <br />11 <br />11 <br />12 <br />13 <br />13 <br />13 <br />14 <br />15 <br />15 <br />15 <br />17 <br />17 <br />18 <br /> <br />Pap <br /> <br />Sampling streambed material-Continued <br />Sampling of fine to moderately coarse bed <br />Daaterial_____________________________ 18 <br />Sampling of coarse bed materiaL ____u___ 19 <br />Problem reaches_____u__u__u_________ 19 <br />Analysis of data_ _n__nnnn_nn_____ 20 <br />Selection of roughness coefficient_u _h__un__ 20 <br />Stable channels.. 'n_nnn_n__hnn__ 20 <br />Base value of n__ ___________________ 20 <br />Cross-section irregularitics__ _________ 21 <br />Depth of flow _ _nn_nnn_"_n____ 21 <br />Vegetation_________ ______________ _ _ 21 <br />JlIinement_________________________ 21 <br />Example___________________________ 21 <br />Sandchann~__________________________ 22 <br />Office procedures____ _______hh____________ 24 <br />Order of computatioDB____ _____________u____ 25 <br />Plan_______________________________________ 25 <br />Plotting methods__ _nn_n__n_nnnn 25 <br />Base line for stationing__________________ 26 <br />Listing of high-water marks_ ____u___________ 26 <br />High-water profiles__________________________ 26 <br />Cross sectioDB_ _____________________________ 27 <br />Cros&-section properties__________________ 27 <br />Computation of discharge_n ______n_un____ 28 <br />Conveyance____________________________ 28 <br />Friction loss____________________________ 28 <br />Velocity head___ __n__n.nn_____n~___ 28 <br />Final discharge____h__nnn_______nh 29 <br />Measurement surnmary______________________ 30 <br />Assembly of computatioDS__ __u___________h 80 <br />Selected references__________________________ 30 <br /> <br />FIGURES <br /> <br />Page <br /> <br />1. Sample field notes illustrating system of horizontal and vertical control, with no <br />instrument error _ _ _ ___________________ ____________________ _____________ 5 <br />2. Sample field notes illustrating system of horizontal and vertical control, with <br />error in iDStrument__________~____________ ______________________ ____ ____ 6 <br />3. Sample correction curve to deterruine corrections applicable to elevations___uh_ 6 <br />4. Sample field notes illustrating sketches of reach and cross sections_::.~___________ 8 <br />5. Sample field notes illustrating crossooSection survey______h___n_n__h_nn___ 16 <br />6. Idealized diagram of bed and surface configuration of alluvial streams with vari- <br />ous regimes of flow_________ _____ __________________ ______~______________ 23 <br />7. Graph showing relation of stream power and median grain size to form of bed <br />roughness___________________________________________________________.__ 24 <br /> <br />TABLE <br /> <br />Page <br /> <br />1. Increase of slope distance over horizontal distance fo computing wetted <br />perUneter___________________~__________________________________,._____. <br /> <br />29 <br /> <br />v <br />