Intensive Survey of the Guadalupe River Segment 1806

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Samples are transferred to the laboratory for analyses within 24 hours of the collection time. Triplicate counting vials are prepared from each primary sample. All counting vials are counted in a Tracor Analytic 6892 LSC Liquid Scintillation Counter which has been calibrated. For each vial, counting extends for a minimum of three 10-minute cycles. The data obtained are analyzed to determine the changes in the krypton-85 to tritium ratio as the tracers flow downstream. The calculations utilized in determining the physical reaeration raes from a stream segment from the liquid scintillation counter data are included here. Krypton-85 transfer in a well-mixed water system is described by the expression: 'kr - K. (C. ,t) (1) dt " " ^kr^kr where: Cbv,,t = concentration of krypton-85 in the water 'kr5 at time(t) K. = gas transfer rate coefficient for krypton-85 The concentration of krypton-85 present in the earth's atmosphere can be assumed zero for practical purposes. Therefore, any krypton-85 dissolved in water which is exposed to the atmosphere will be steadily lost from the water to the atmosphere according to equation 1. The gas transfer rate coefficient for oxygen (K ) is related to Kk by the equation: x r kr = 0.83 + 0.04 (2) Kox Equation 2 is the basis for using krypton-85 as a tracer for oxygen transfer in stream reaeration because the numerical constant (0.83) has been experimentally demonstrated to be independent of the degree of tur bulent mixing, of the direction in which the two gases happen to be moving, and of temperature. The disperion or dilution tracer (tritiated water) is used simultaneously with the dissolved gas tracer (krypton-85) to correct for the effects of dispersion and dilution in the stream segment being studied. A single homogeneous solution containing the dissolved krypton-85 gas, tritiated water, and dye is released at the upstream reach of the stream segment being studied. As the tracer mass moves downstream, multiple samples are collected as the peak concentration passes successive sampling stations. In the laboratory, peak concentration samples from each station are analyzed and the krypton-85/tritium concentration ratio (R) is es tablished by the equation: A-14
Ckr R =-J^- (3) Lh where: C. = concentration of krypton-85 in water at time of peak concentration C. = concentration of tritium in the water at time of peak concentration Applying this ratio concept, equation 1 can be modified to: -W- - - Kkr R (*) with terms as previously defined Equation 4 can be transformed to: where: Ru and Rj = peak ratios of krypton-85 to tritium concentrations at an upstream and downstream station tf = travel time between the upstream and down stream station determined by dye peaks The tracers are used to evaluate the actual krypton-85 transfer coefficient (Ki,J, (K. ), and the conversion to the 0) oxygen transfer coefficient (K„w) is from 4-UM ..A.L1 2 ~l~~ J I J.*^ OX the established gas exchange ratio: K0X = Kkr ox ~rar A-15
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INTENSIVE SURVEY OF GUADALUPE RIVER
Page 3 and 4:
ABSTRACT An intensive survey of Gua
Page 5 and 6:
TABLE OF CONTENTS CONTINUED Page Be
Page 7 and 8:
METHODS Field and laboratory proced
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wheat and oats are grown in the reg
Page 11 and 12: 40, and 400 mg/L (annual averages).
Page 13 and 14: indicating the highest need for str
Page 15 and 16: consideration. An abundance of orth
Page 17 and 18: increase in the importance of pollu
Page 19 and 20: CONCLUSIONS The historical data and
Page 22 and 23: TABLE 1 Guadalupe River Sampling Lo
Page 24 and 25: to Station Location IH 10 in Comfor
Page 26 and 27: to CO Station/SMN Number Center Poi
Page 28 and 29: SO CJI Station Location/ SMN Number
Page 30 and 31: to *3 5.65 200 4.52 -- -- 1 60 RR 3
Page 32 and 33: Figure 4 Location of Hydraulic Meas
Page 34 and 35: Figure 5 Location of Cross Sectiona
Page 36 and 37: TABLE 8 Guadalupe River Field Measu
Page 38 and 39: TABLE 8 CONTINUED Map Code Water Di
Page 40 and 41: 1800.9010 11/01/83 COMP 0.3 20.0 4.
Page 42 and 43: CO CD Map Code Station Number of In
Page 44 and 45: Map Code Station 0STRAC0DA Taxon St
Page 46 and 47: 4* CO Map Code Station Taxon EPHEME
Page 48 and 49: TABLE 12 Percentage Composition of
Page 50 and 51: APPENDIX A >.fl&^fc- .. - -.^K&ST
Page 52 and 53: Laboratory Analyses Parameter Five
Page 54 and 55: Selection of a specific test site m
Page 56 and 57: BENTHIC MACROINVERTEBRATES 2 Benthi
Page 58 and 59: Samples are stored in quart cubitai
Page 60 and 61: where DOj = initial dissolved oxyge
Page 64 and 65: REFERENCES CITED 1. American Public
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Intensive Survey of the Guadalupe River Segment 1806

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